diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/client.rpt
index cc1a004b2b..5104bd0301 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -184,6 +185,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/server.rpt
index 5023162a29..72b69fe1d9 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.abort.reconnect.non.clean.start/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -170,6 +171,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/client.rpt
index b17bc2c18a..c9593137f9 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/server.rpt
index 9761a45495..dc43780c91 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.sent.reset/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/client.rpt
index 72f713d0a6..398eb8c11c 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -146,6 +147,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -157,6 +159,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -220,6 +223,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -234,6 +238,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/server.rpt
index 16e4a117a9..1c0f47f779 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.client.takeover/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -146,6 +147,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -159,6 +161,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -212,6 +215,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -228,6 +232,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/client.rpt
index d7238700bd..47d321a2c2 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -146,6 +147,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -159,6 +161,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -221,6 +224,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -233,6 +237,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/server.rpt
index 12fd62832f..116f1da2d8 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.exists.clean.start/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -146,6 +147,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -160,6 +162,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -215,6 +218,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
@@ -229,6 +233,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/client.rpt
index 74a4d2c97d..232d3145da 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/server.rpt
index 1f89f2850f..a8decf49d2 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.group.server.sent.reset/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/client.rpt
index 582dbc7019..0f6ef624fc 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/server.rpt
index d21303343b..7e5a10c960 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.server.sent.reset/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/client.rpt
index 0a954ff579..974063e3b7 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/server.rpt
index 9db846d27a..4287d0b897 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe.via.session.state/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/client.rpt
index cec9c6a266..c72a043fc6 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/server.rpt
index eddaecfc04..41577d3aef 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.subscribe/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/client.rpt
index b5ef64ebdc..868fe4a5c5 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/server.rpt
index c1e0f2eddb..d8a4504d4d 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.after.subscribe/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/client.rpt
index de5e39f5b4..55efc89d01 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/client.rpt
@@ -37,6 +37,7 @@ write zilla:data.ext ${kafka:dataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/server.rpt
index 2b4dc1b281..9cf6f4f03e 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/kafka/session.unsubscribe.via.session.state/server.rpt
@@ -39,6 +39,7 @@ read zilla:data.ext ${kafka:matchDataEx()
                                .deferred(0)
                                .partition(-1, -1)
                                .key("client-1#migrate")
+                               .hashKey("client-1")
                                .header("sender-id", "sender-1")
                                .build()
                            .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/client.rpt
index 8429c220cc..58c446c456 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
@@ -70,8 +70,8 @@ connect await SESSION1_ABORTED
 write zilla:begin.ext ${mqtt:beginEx()
                                .typeId(zilla:id("mqtt"))
                                .session()
-                                  .clientId("client-1")
                                   .expiry(1)
+                                  .clientId("client-1")
                                   .build()
                                .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/server.rpt
index ad9ee2ce1f..1505e82923 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.abort.reconnect.non.clean.start/server.rpt
@@ -23,8 +23,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
@@ -66,6 +66,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/client.rpt
index a225126b73..628c0114fe 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                               .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/server.rpt
index be2069e676..7afd1331b1 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.sent.reset/server.rpt
@@ -22,8 +22,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/client.rpt
index 5a8557316e..5e04d0a12f 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                                .typeId(zilla:id("mqtt"))
                                .session()
-                                  .clientId("client-1")
                                   .expiry(1)
+                                  .clientId("client-1")
                                   .build()
                                .build()}
 
@@ -68,8 +68,8 @@ connect await CONNECTED
 write zilla:begin.ext ${mqtt:beginEx()
                                .typeId(zilla:id("mqtt"))
                                .session()
-                                  .clientId("client-1")
                                   .expiry(1)
+                                  .clientId("client-1")
                                   .build()
                                .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/server.rpt
index b99a7bfec5..d4e46af36c 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.client.takeover/server.rpt
@@ -22,6 +22,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
@@ -66,6 +67,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/client.rpt
index ac9a831686..d5d7c03eec 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
@@ -73,8 +73,8 @@ connect await SESSION_READY
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/server.rpt
index 496822dd17..f79622e0db 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.exists.clean.start/server.rpt
@@ -22,6 +22,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
@@ -63,6 +64,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/client.rpt
index c3f002620c..d45c693511 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                               .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/server.rpt
index 1802b2d422..3a13bf2953 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.server.sent.reset/server.rpt
@@ -22,8 +22,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/client.rpt
index 640f139646..64a0c9dfe3 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                               .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/server.rpt
index 15212eda0a..5a6717a9be 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe.via.session.state/server.rpt
@@ -22,6 +22,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .expiry(1)
                                 .clientId("client-1")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/client.rpt
index a16768f84d..1919464e2e 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                               .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/server.rpt
index a75a7dff44..dc487358ef 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.subscribe/server.rpt
@@ -22,8 +22,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/client.rpt
index 7195298048..1d9b28e1ab 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/server.rpt
index a15b6da914..9a66280e9e 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.after.subscribe/server.rpt
@@ -23,8 +23,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/client.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/client.rpt
index 21507a821f..936ce63059 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/client.rpt
@@ -20,8 +20,8 @@ connect "zilla://streams/mqtt0"
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/server.rpt b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/server.rpt
index b62e481f0d..0d80c4b9a7 100644
--- a/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt-kafka.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/kafka/streams/mqtt/session.unsubscribe.via.session.state/server.rpt
@@ -23,8 +23,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("client-1")
                                 .expiry(1)
+                                .clientId("client-1")
                                 .build()
                              .build()}
 
diff --git a/incubator/binding-mqtt-kafka/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/kafka/internal/stream/MqttKafkaSessionFactory.java b/incubator/binding-mqtt-kafka/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/kafka/internal/stream/MqttKafkaSessionFactory.java
index 4b38221c86..dc11a6bb44 100644
--- a/incubator/binding-mqtt-kafka/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/kafka/internal/stream/MqttKafkaSessionFactory.java
+++ b/incubator/binding-mqtt-kafka/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/kafka/internal/stream/MqttKafkaSessionFactory.java
@@ -311,7 +311,7 @@ private void onMqttData(
                     .timestamp(now().toEpochMilli())
                     .partition(p -> p.partitionId(-1).partitionOffset(-1))
                     .key(b -> b.length(clientId.length())
-                    .value(clientId.value(), 0, clientId.length())))
+                        .value(clientId.value(), 0, clientId.length())))
                 .build();
 
             if (sessionState != null)
@@ -797,6 +797,8 @@ protected void sendMigrateSignal(long authorization, long traceId)
                     .partition(p -> p.partitionId(-1).partitionOffset(-1))
                     .key(b -> b.length(delegate.clientIdMigrate.length())
                         .value(delegate.clientIdMigrate.value(), 0, delegate.clientIdMigrate.length()))
+                    .hashKey(b -> b.length(delegate.clientId.length())
+                        .value(delegate.clientId.value(), 0, delegate.clientId.length()))
                     .headersItem(c -> c.nameLen(SENDER_ID_NAME.length())
                         .name(SENDER_ID_NAME.value(), 0, SENDER_ID_NAME.length())
                         .valueLen(delegate.sessionId.length())
diff --git a/incubator/binding-mqtt.spec/src/main/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctions.java b/incubator/binding-mqtt.spec/src/main/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctions.java
index 697c73aa40..b1ef279da1 100644
--- a/incubator/binding-mqtt.spec/src/main/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctions.java
+++ b/incubator/binding-mqtt.spec/src/main/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctions.java
@@ -19,6 +19,7 @@
 
 import java.nio.ByteBuffer;
 import java.util.Arrays;
+import java.util.concurrent.ThreadLocalRandom;
 import java.util.function.Predicate;
 
 import org.agrona.DirectBuffer;
@@ -30,12 +31,12 @@
 
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.Array32FW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttBinaryFW;
-import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttEndReasonCode;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttMessageFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttPayloadFormat;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttPayloadFormatFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttPublishFlags;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttQoS;
+import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttSessionFlags;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttSessionStateFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttSubscribeFlags;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttTopicFilterFW;
@@ -44,13 +45,14 @@
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.Varuint32FW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttBeginExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttDataExFW;
-import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttEndExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttExtensionKind;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttFlushExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttPublishBeginExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttPublishDataExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttResetExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSessionBeginExFW;
+import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSessionDataExFW;
+import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSessionDataKind;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSubscribeBeginExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSubscribeDataExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttSubscribeFlushExFW;
@@ -99,12 +101,6 @@ public static MqttFlushExBuilder flushEx()
         return new MqttFlushExBuilder();
     }
 
-    @Function
-    public static MqttEndExBuilder endEx()
-    {
-        return new MqttEndExBuilder();
-    }
-
     @Function
     public static MqttResetExBuilder resetEx()
     {
@@ -117,6 +113,24 @@ public static MqttSessionStateBuilder session()
         return new MqttSessionStateBuilder();
     }
 
+    @Function
+    public static MqttWillMessageBuilder will()
+    {
+        return new MqttWillMessageBuilder();
+    }
+
+    @Function
+    public static byte[] randomBytes(
+        int length)
+    {
+        byte[] bytes = new byte[length];
+        for (int i = 0; i < length; i++)
+        {
+            bytes[i] = (byte) ThreadLocalRandom.current().nextInt(0x100);
+        }
+        return bytes;
+    }
+
     public static final class MqttBeginExBuilder
     {
         private final MutableDirectBuffer writeBuffer = new UnsafeBuffer(new byte[1024 * 8]);
@@ -190,30 +204,29 @@ public MqttSessionBeginExBuilder expiry(
                 return this;
             }
 
-            public MqttSessionBeginExBuilder serverReference(
-                String serverReference)
+            public MqttSessionBeginExBuilder serverRef(
+                String serverRef)
             {
-                sessionBeginExRW.serverReference(serverReference);
+                sessionBeginExRW.serverRef(serverRef);
                 return this;
             }
 
-            public MqttWillMessageBuilder will()
+            public MqttSessionBeginExBuilder flags(
+                String... flagNames)
             {
-                return new MqttWillMessageBuilder(this);
+                int flags = Arrays.stream(flagNames)
+                    .mapToInt(flag -> 1 << MqttSessionFlags.valueOf(flag).value())
+                    .reduce(0, (a, b) -> a | b);
+                sessionBeginExRW.flags(flags);
+                return this;
             }
 
             public MqttBeginExBuilder build()
             {
-                final MqttSessionBeginExFW subscribeBeginEx = sessionBeginExRW.build();
-                beginExRO.wrap(writeBuffer, 0, subscribeBeginEx.limit());
+                final MqttSessionBeginExFW sessionBeginEx = sessionBeginExRW.build();
+                beginExRO.wrap(writeBuffer, 0, sessionBeginEx.limit());
                 return MqttBeginExBuilder.this;
             }
-
-            private void willMessage(
-                MqttMessageFW willMessage)
-            {
-                sessionBeginExRW.will(willMessage);
-            }
         }
 
         public final class MqttSubscribeBeginExBuilder
@@ -345,6 +358,13 @@ public MqttDataExBuilder.MqttPublishDataExBuilder publish()
             return new MqttDataExBuilder.MqttPublishDataExBuilder();
         }
 
+        public MqttDataExBuilder.MqttSessionDataExBuilder session()
+        {
+            dataExRW.kind(MqttExtensionKind.SESSION.value());
+
+            return new MqttDataExBuilder.MqttSessionDataExBuilder();
+        }
+
         public byte[] build()
         {
             final MqttDataExFW dataEx = dataExRO;
@@ -530,8 +550,32 @@ public MqttPublishDataExBuilder userProperty(
 
             public MqttDataExBuilder build()
             {
-                final MqttPublishDataExFW publishBeginEx = publishDataExRW.build();
-                dataExRO.wrap(writeBuffer, 0, publishBeginEx.limit());
+                final MqttPublishDataExFW publishDataEx = publishDataExRW.build();
+                dataExRO.wrap(writeBuffer, 0, publishDataEx.limit());
+                return MqttDataExBuilder.this;
+            }
+        }
+
+        public final class MqttSessionDataExBuilder
+        {
+            private final MqttSessionDataExFW.Builder sessionDataExRW = new MqttSessionDataExFW.Builder();
+
+            private MqttSessionDataExBuilder()
+            {
+                sessionDataExRW.wrap(writeBuffer, MqttBeginExFW.FIELD_OFFSET_SESSION, writeBuffer.capacity());
+            }
+
+            public MqttSessionDataExBuilder kind(
+                String kind)
+            {
+                sessionDataExRW.kind(k -> k.set(MqttSessionDataKind.valueOf(kind)));
+                return this;
+            }
+
+            public MqttDataExBuilder build()
+            {
+                final MqttSessionDataExFW sessionDataEx = sessionDataExRW.build();
+                dataExRO.wrap(writeBuffer, 0, sessionDataEx.limit());
                 return MqttDataExBuilder.this;
             }
         }
@@ -612,39 +656,6 @@ public byte[] build()
         }
     }
 
-    public static final class MqttEndExBuilder
-    {
-        private final MqttEndExFW.Builder endExRW;
-
-        private MqttEndExBuilder()
-        {
-            MutableDirectBuffer writeBuffer = new UnsafeBuffer(new byte[1024 * 8]);
-            this.endExRW = new MqttEndExFW.Builder().wrap(writeBuffer, 0, writeBuffer.capacity());
-        }
-
-        public MqttEndExBuilder typeId(
-            int typeId)
-        {
-            endExRW.typeId(typeId);
-            return this;
-        }
-
-        public MqttEndExBuilder reason(
-            String reason)
-        {
-            endExRW.reasonCode(r -> r.set(MqttEndReasonCode.valueOf(reason)));
-            return this;
-        }
-
-        public byte[] build()
-        {
-            final MqttEndExFW endEx = endExRW.build();
-            final byte[] array = new byte[endEx.sizeof()];
-            endEx.buffer().getBytes(endEx.offset(), array);
-            return array;
-        }
-    }
-
     public static final class MqttResetExBuilder
     {
         private final MqttResetExFW.Builder resetExRW;
@@ -662,10 +673,10 @@ public MqttResetExBuilder typeId(
             return this;
         }
 
-        public MqttResetExBuilder serverReference(
-            String serverReference)
+        public MqttResetExBuilder serverRef(
+            String serverRef)
         {
-            resetExRW.serverReference(serverReference);
+            resetExRW.serverRef(serverRef);
             return this;
         }
 
@@ -729,11 +740,9 @@ public byte[] build()
     public static final class MqttWillMessageBuilder
     {
         private final MqttMessageFW.Builder willMessageRW = new MqttMessageFW.Builder();
-        private final MqttBeginExBuilder.MqttSessionBeginExBuilder beginExBuilder;
 
-        private MqttWillMessageBuilder(MqttBeginExBuilder.MqttSessionBeginExBuilder beginExBuilder)
+        private MqttWillMessageBuilder()
         {
-            this.beginExBuilder = beginExBuilder;
             MutableDirectBuffer writeBuffer = new UnsafeBuffer(new byte[1024 * 8]);
             willMessageRW.wrap(writeBuffer, 0, writeBuffer.capacity());
         }
@@ -833,10 +842,12 @@ public MqttWillMessageBuilder payloadBytes(
             return this;
         }
 
-        public MqttBeginExBuilder.MqttSessionBeginExBuilder build()
+        public byte[] build()
         {
-            beginExBuilder.willMessage(willMessageRW.build());
-            return beginExBuilder;
+            final MqttMessageFW willMessage = willMessageRW.build();
+            final byte[] array = new byte[willMessage.sizeof()];
+            willMessage.buffer().getBytes(willMessage.offset(), array);
+            return array;
         }
     }
 
@@ -1093,9 +1104,9 @@ private boolean matchFilters(
         public final class MqttSessionBeginExMatcherBuilder
         {
             private String16FW clientId;
-            private String16FW serverReference;
+            private String16FW serverRef;
             private Integer expiry;
-            private MqttWillMessageMatcherBuilder willMessageMatcher;
+            private Integer flags;
 
             private MqttSessionBeginExMatcherBuilder()
             {
@@ -1115,17 +1126,20 @@ public MqttSessionBeginExMatcherBuilder expiry(
                 return this;
             }
 
-            public MqttSessionBeginExMatcherBuilder serverReference(
-                String serverReference)
+            public MqttSessionBeginExMatcherBuilder serverRef(
+                String serverRef)
             {
-                this.serverReference = new String16FW(serverReference);
+                this.serverRef = new String16FW(serverRef);
                 return this;
             }
 
-            public MqttWillMessageMatcherBuilder will()
+            public MqttSessionBeginExMatcherBuilder flags(
+                String... flagNames)
             {
-                this.willMessageMatcher = new MqttWillMessageMatcherBuilder();
-                return willMessageMatcher;
+                this.flags = Arrays.stream(flagNames)
+                    .mapToInt(flag -> 1 << MqttSessionFlags.valueOf(flag).value())
+                    .reduce(0, (a, b) -> a | b);
+                return this;
             }
 
             public MqttBeginExMatcherBuilder build()
@@ -1137,11 +1151,10 @@ private boolean match(
                 MqttBeginExFW beginEx)
             {
                 final MqttSessionBeginExFW sessionBeginEx = beginEx.session();
-                final MqttMessageFW willMessage = beginEx.session().will();
                 return matchClientId(sessionBeginEx) &&
                     matchExpiry(sessionBeginEx) &&
-                    matchServerReference(sessionBeginEx) &&
-                    (willMessageMatcher == null || willMessageMatcher.match(willMessage));
+                    matchFlags(sessionBeginEx) &&
+                    matchserverRef(sessionBeginEx);
             }
 
             private boolean matchClientId(
@@ -1156,241 +1169,16 @@ private boolean matchExpiry(
                 return expiry == null || expiry == sessionBeginEx.expiry();
             }
 
-            private boolean matchServerReference(
+            private boolean matchFlags(
                 final MqttSessionBeginExFW sessionBeginEx)
             {
-                return serverReference == null || serverReference.equals(sessionBeginEx.serverReference());
+                return flags == null || flags == sessionBeginEx.flags();
             }
 
-            public final class MqttWillMessageMatcherBuilder
+            private boolean matchserverRef(
+                final MqttSessionBeginExFW sessionBeginEx)
             {
-                private MqttBinaryFW.Builder correlationRW;
-                private final DirectBuffer correlationRO = new UnsafeBuffer(0, 0);
-                private MqttBinaryFW.Builder payloadRW;
-                private final DirectBuffer payloadRO = new UnsafeBuffer(0, 0);
-                private String16FW topic;
-                private Integer delay;
-                private Integer qos;
-                private Integer flags;
-                private Integer expiryInterval = -1;
-                private String16FW contentType;
-                private MqttPayloadFormatFW format;
-                private String16FW responseTopic;
-                private Array32FW.Builder<MqttUserPropertyFW.Builder, MqttUserPropertyFW> userPropertiesRW;
-
-                private MqttWillMessageMatcherBuilder()
-                {
-                }
-
-                public MqttWillMessageMatcherBuilder topic(
-                    String topic)
-                {
-                    this.topic = new String16FW(topic);
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder delay(
-                    int delay)
-                {
-                    this.delay = delay;
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder qos(
-                    String qos)
-                {
-                    this.qos = MqttQoS.valueOf(qos).ordinal();
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder flags(
-                    String... flagNames)
-                {
-                    int flags = Arrays.stream(flagNames)
-                        .mapToInt(flag -> 1 << MqttPublishFlags.valueOf(flag).ordinal())
-                        .reduce(0, (a, b) -> a | b);
-                    this.flags = flags;
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder expiryInterval(
-                    int expiryInterval)
-                {
-                    this.expiryInterval = expiryInterval;
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder contentType(
-                    String contentType)
-                {
-                    this.contentType = new String16FW(contentType);
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder format(
-                    String format)
-                {
-                    MqttPayloadFormatFW.Builder builder =
-                        new MqttPayloadFormatFW.Builder().wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-                    this.format = builder.set(MqttPayloadFormat.valueOf(format)).build();
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder responseTopic(
-                    String topic)
-                {
-                    this.responseTopic = new String16FW(topic);
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder correlation(
-                    String correlation)
-                {
-                    assert correlationRW == null;
-                    correlationRW = new MqttBinaryFW.Builder().wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-
-                    correlationRO.wrap(correlation.getBytes(UTF_8));
-                    correlationRW.bytes(correlationRO, 0, correlationRO.capacity());
-
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder correlationBytes(
-                    byte[] correlation)
-                {
-                    assert correlationRW == null;
-                    correlationRW = new MqttBinaryFW.Builder().wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-
-                    correlationRO.wrap(correlation);
-                    correlationRW.bytes(correlationRO, 0, correlationRO.capacity());
-
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder userProperty(
-                    String name,
-                    String value)
-                {
-                    if (userPropertiesRW == null)
-                    {
-                        this.userPropertiesRW =
-                            new Array32FW.Builder<>(new MqttUserPropertyFW.Builder(), new MqttUserPropertyFW())
-                            .wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-                    }
-                    userPropertiesRW.item(p -> p.key(name).value(value));
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder payload(
-                    String payload)
-                {
-                    assert payloadRW == null;
-                    payloadRW = new MqttBinaryFW.Builder().wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-
-                    payloadRO.wrap(payload.getBytes(UTF_8));
-                    payloadRW.bytes(payloadRO, 0, payloadRO.capacity());
-
-                    return this;
-                }
-
-                public MqttWillMessageMatcherBuilder payloadBytes(
-                    byte[] payload)
-                {
-                    assert payloadRW == null;
-                    payloadRW = new MqttBinaryFW.Builder().wrap(new UnsafeBuffer(new byte[1024]), 0, 1024);
-
-                    payloadRO.wrap(payload);
-                    payloadRW.bytes(payloadRO, 0, payloadRO.capacity());
-
-                    return this;
-                }
-
-                public MqttSessionBeginExMatcherBuilder build()
-                {
-                    return MqttSessionBeginExMatcherBuilder.this;
-                }
-
-                private boolean match(
-                    MqttMessageFW willMessage)
-                {
-                    return matchTopic(willMessage) &&
-                        matchDelay(willMessage) &&
-                        matchQos(willMessage) &&
-                        matchFlags(willMessage) &&
-                        matchExpiryInterval(willMessage) &&
-                        matchContentType(willMessage) &&
-                        matchFormat(willMessage) &&
-                        matchResponseTopic(willMessage) &&
-                        matchCorrelation(willMessage) &&
-                        matchUserProperties(willMessage) &&
-                        matchPayload(willMessage);
-                }
-
-                private boolean matchTopic(
-                    final MqttMessageFW willMessage)
-                {
-                    return topic == null || topic.equals(willMessage.topic());
-                }
-
-                private boolean matchDelay(
-                    final MqttMessageFW willMessage)
-                {
-                    return delay == null || delay == willMessage.delay();
-                }
-
-                private boolean matchQos(
-                    final MqttMessageFW willMessage)
-                {
-                    return qos == null || qos == willMessage.qos();
-                }
-
-                private boolean matchFlags(
-                    final MqttMessageFW willMessage)
-                {
-                    return flags == null || flags == willMessage.flags();
-                }
-
-                private boolean matchExpiryInterval(
-                    final MqttMessageFW willMessage)
-                {
-                    return expiryInterval == null || expiryInterval == willMessage.expiryInterval();
-                }
-
-                private boolean matchContentType(
-                    final MqttMessageFW willMessage)
-                {
-                    return contentType == null || contentType.equals(willMessage.contentType());
-                }
-
-                private boolean matchFormat(
-                    final MqttMessageFW willMessage)
-                {
-                    return format == null || format.equals(willMessage.format());
-                }
-
-                private boolean matchResponseTopic(
-                    final MqttMessageFW willMessage)
-                {
-                    return responseTopic == null || responseTopic.equals(willMessage.responseTopic());
-                }
-
-                private boolean matchCorrelation(
-                    final MqttMessageFW willMessage)
-                {
-                    return correlationRW == null || correlationRW.build().equals(willMessage.correlation());
-                }
-
-                private boolean matchUserProperties(
-                    final MqttMessageFW willMessage)
-                {
-                    return userPropertiesRW == null || userPropertiesRW.build().equals(willMessage.properties());
-                }
-
-                private boolean matchPayload(
-                    final MqttMessageFW willMessage)
-                {
-                    return payloadRW == null || payloadRW.build().equals(willMessage.payload());
-                }
+                return serverRef == null || serverRef.equals(sessionBeginEx.serverRef());
             }
         }
     }
diff --git a/incubator/binding-mqtt.spec/src/main/resources/META-INF/zilla/mqtt.idl b/incubator/binding-mqtt.spec/src/main/resources/META-INF/zilla/mqtt.idl
index b2e51a0efb..7265b549b3 100644
--- a/incubator/binding-mqtt.spec/src/main/resources/META-INF/zilla/mqtt.idl
+++ b/incubator/binding-mqtt.spec/src/main/resources/META-INF/zilla/mqtt.idl
@@ -15,6 +15,12 @@
  */
 scope mqtt
 {
+    enum MqttSessionFlags (uint8)
+    {
+        CLEAN_START(1),
+        WILL(2)
+    }
+
     enum MqttSubscribeFlags (uint8)
     {
         SEND_RETAINED(0),
@@ -42,13 +48,6 @@ scope mqtt
         SESSION(3)
     }
 
-    enum MqttEndReasonCode (uint8)
-    {
-        DISCONNECT(0),
-        KEEP_ALIVE_EXPIRY(1),
-        DISCONNECT_WITH_WILL(2)
-    }
-
     enum MqttPayloadFormat
     {
         BINARY,
@@ -114,10 +113,10 @@ scope mqtt
 
         struct MqttSessionBeginEx
         {
-            string16 clientId;
+            uint8 flags = 0;
             int32 expiry = 0;
-            string16 serverReference = null;
-            MqttMessage will;
+            string16 clientId;
+            string16 serverRef = null;
         }
 
         struct MqttSubscribeBeginEx
@@ -137,6 +136,7 @@ scope mqtt
         {
             case 0: mqtt::stream::MqttPublishDataEx publish;
             case 1: mqtt::stream::MqttSubscribeDataEx subscribe;
+            case 2: mqtt::stream::MqttSessionDataEx session;
         }
 
         struct MqttSubscribeDataEx
@@ -167,14 +167,20 @@ scope mqtt
             MqttUserProperty[] properties;
         }
 
-        struct MqttResetEx extends core::stream::Extension
+        enum MqttSessionDataKind
         {
-            string16 serverReference = null;
+            STATE,
+            WILL
         }
 
-        struct MqttEndEx extends core::stream::Extension
+        struct MqttSessionDataEx
+        {
+            MqttSessionDataKind kind;
+        }
+
+        struct MqttResetEx extends core::stream::Extension
         {
-            MqttEndReasonCode reasonCode = DISCONNECT;
+            string16 serverRef = null;
         }
 
         union MqttFlushEx switch (uint8) extends core::stream::Extension
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/client.rpt
index 72c682e759..ca638f0b15 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/server.rpt
index 8a8d7a410a..93307a50fe 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.abort.reconnect.non.clean.start/server.rpt
@@ -32,6 +32,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/client.rpt
index 77f2824ab1..0b68e3386c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/client.rpt
@@ -27,6 +27,13 @@ write zilla:begin.ext ${mqtt:beginEx()
 
 connected
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/server.rpt
index 42a990e7c1..3f6dfd1e96 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.client.takeover/server.rpt
@@ -32,6 +32,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/client.rpt
index 7c06e2e3a0..28f707919e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/client.rpt
@@ -21,8 +21,8 @@ connect "zilla://streams/app0"
 write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
-                                .clientId("one")
                                 .expiry(1)
+                                .clientId("one")
                                 .build()
                               .build()}
 connected
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/server.rpt
index 113f780150..e4da874660 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.connect.with.session.expiry/server.rpt
@@ -23,8 +23,8 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
-                                .clientId("one")
                                 .expiry(1)
+                                .clientId("one")
                                 .build()
                              .build()}
 connected
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/client.rpt
index 1e1c2aed10..7bf3e9eb1d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -72,6 +79,7 @@ connect await SESSION_READY
 write zilla:begin.ext ${mqtt:beginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .flags("CLEAN_START")
                                 .clientId("client")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/server.rpt
index 07a9968ea5..4161f89687 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.exists.clean.start/server.rpt
@@ -32,6 +32,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -66,6 +73,7 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .flags("CLEAN_START")
                                 .clientId("client")
                                 .build()
                              .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/client.rpt
index e71aa48366..2e7698520a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/client.rpt
@@ -22,7 +22,7 @@ write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
                                 .clientId("client")
-                                .serverReference("localhost:1883")
+                                .serverRef("localhost:1883")
                                 .build()
                               .build()}
 
@@ -32,7 +32,7 @@ read zilla:data.empty
 
 read zilla:reset.ext ${mqtt:resetEx()
                              .typeId(zilla:id("mqtt"))
-                             .serverReference("localhost:1884")
+                             .serverRef("localhost:1884")
                              .build()}
 
 write aborted
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/server.rpt
index d74bfdc289..41c25ac043 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.after.connack/server.rpt
@@ -24,7 +24,7 @@ read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
                                 .clientId("client")
-                                .serverReference("localhost:1883")
+                                .serverRef("localhost:1883")
                                 .build()
                              .build()}
 
@@ -35,7 +35,7 @@ write flush
 
 write zilla:reset.ext ${mqtt:resetEx()
                              .typeId(zilla:id("mqtt"))
-                             .serverReference("localhost:1884")
+                             .serverRef("localhost:1884")
                              .build()}
 
 read abort
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/client.rpt
index 9b849f7b88..421ed4976a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/client.rpt
@@ -22,7 +22,7 @@ write zilla:begin.ext ${mqtt:beginEx()
                               .typeId(zilla:id("mqtt"))
                               .session()
                                 .clientId("client")
-                                .serverReference("localhost:1883")
+                                .serverRef("localhost:1883")
                                 .build()
                               .build()}
 
@@ -30,7 +30,7 @@ connected
 
 read zilla:reset.ext ${mqtt:resetEx()
                              .typeId(zilla:id("mqtt"))
-                             .serverReference("localhost:1884")
+                             .serverRef("localhost:1884")
                              .build()}
 
 write aborted
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/server.rpt
index c80cf2a278..6e8b43130e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.server.redirect.before.connack/server.rpt
@@ -24,7 +24,7 @@ read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
                                 .clientId("client")
-                                .serverReference("localhost:1883")
+                                .serverRef("localhost:1883")
                                 .build()
                              .build()}
 
@@ -32,7 +32,7 @@ connected
 
 write zilla:reset.ext ${mqtt:resetEx()
                              .typeId(zilla:id("mqtt"))
-                             .serverReference("localhost:1884")
+                             .serverRef("localhost:1884")
                              .build()}
 
 read abort
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/client.rpt
index 22d2e6529e..9ea94267e0 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -38,6 +45,13 @@ read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .subscription("sensor/two", 2)
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/server.rpt
index 1f43fea32d..0e04154821 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe.multiple.isolated/server.rpt
@@ -32,6 +32,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -41,6 +48,13 @@ write ${mqtt:session()
                .build()}
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .subscription("sensor/two", 2)
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/client.rpt
index bf293f83a1..578940e7d5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/server.rpt
index 0e78132b91..c5027bb198 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.subscribe/server.rpt
@@ -32,6 +32,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/client.rpt
index 200d21fc64..16cfaa112a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .subscription("sensor/two", 1)
@@ -40,6 +47,13 @@ read ${mqtt:session()
                .subscription("sensor/two", 1)
                .build()}
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .build()}
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/server.rpt
index 6243dda9e3..95ffcd3aaa 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe.deferred/server.rpt
@@ -31,6 +31,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .subscription("sensor/two", 1)
@@ -43,6 +50,13 @@ write ${mqtt:session()
                .build()}
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .build()}
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/client.rpt
index a6cfebd9c9..8e7264694f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/client.rpt
@@ -29,6 +29,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -37,6 +44,13 @@ read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .build()}
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/server.rpt
index 8b8acf889c..f4a805c480 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.after.subscribe/server.rpt
@@ -33,6 +33,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
@@ -42,6 +49,13 @@ write ${mqtt:session()
                .build()}
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .build()}
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/client.rpt
index e7af77b53c..e49c39952f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/client.rpt
@@ -30,6 +30,13 @@ connected
 
 read zilla:data.empty
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 write ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/server.rpt
index 87f98db3e8..1ac1e8f037 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.unsubscribe.via.session.state/server.rpt
@@ -33,6 +33,13 @@ connected
 write zilla:data.empty
 write flush
 
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("STATE")
+                                .build()
+                             .build()}
+
 read ${mqtt:session()
                .subscription("sensor/one", 1)
                .build()}
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/client.rpt
similarity index 66%
rename from incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/client.rpt
rename to incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/client.rpt
index 327eacf0dd..51937e1f9e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/client.rpt
@@ -21,23 +21,27 @@ connect "zilla://streams/app0"
 write zilla:begin.ext ${mqtt:beginEx()
                            .typeId(zilla:id("mqtt"))
                            .session()
+                              .flags("WILL", "CLEAN_START")
                               .clientId("one")
-                              .will()
-                                  .topic("wills/one")
-                                  .format("TEXT")
-                                  .payload("client one session expired")
-                                  .build()
                               .build()
                            .build()}
 
 connected
 
-read zilla:data.empty
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+write ${mqtt:will()
+               .topic("wills/one")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+write flush
 
-write zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("DISCONNECT_WITH_WILL")
-                        .build()}
+read zilla:data.empty
 
-write close
-read closed
+write abort
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/server.rpt
similarity index 67%
rename from incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/server.rpt
rename to incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/server.rpt
index 7fa2aa8b91..fb26a8d19a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.disconnect.with.will.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.abort/server.rpt
@@ -23,24 +23,28 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .flags("WILL", "CLEAN_START")
                                 .clientId("one")
-                                .will()
-                                    .topic("wills/one")
-                                    .format("TEXT")
-                                    .payload("client one session expired")
-                                    .build()
                                 .build()
                              .build()}
 
 connected
 
+
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+read ${mqtt:will()
+               .topic("wills/one")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+
 write zilla:data.empty
 write flush
 
-read zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("DISCONNECT_WITH_WILL")
-                        .build()}
-
-read closed
-write close
+read aborted
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/client.rpt
deleted file mode 100644
index 1a916fea30..0000000000
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/client.rpt
+++ /dev/null
@@ -1,43 +0,0 @@
-#
-# Copyright 2021-2023 Aklivity Inc.
-#
-# Aklivity licenses this file to you under the Apache License,
-# version 2.0 (the "License"); you may not use this file except in compliance
-# with the License. You may obtain a copy of the License at:
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-
-connect "zilla://streams/app0"
-         option zilla:window 8192
-         option zilla:transmission "duplex"
-
-write zilla:begin.ext ${mqtt:beginEx()
-                           .typeId(zilla:id("mqtt"))
-                           .session()
-                              .clientId("one")
-                              .will()
-                                  .topic("wills/one")
-                                  .format("TEXT")
-                                  .payload("client one session expired")
-                                  .build()
-                              .build()
-                           .build()}
-
-connected
-
-read zilla:data.empty
-
-write zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("KEEP_ALIVE_EXPIRY")
-                        .build()}
-
-write close
-read closed
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/server.rpt
deleted file mode 100644
index 7d09b0668c..0000000000
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.no.ping.within.keep.alive/server.rpt
+++ /dev/null
@@ -1,46 +0,0 @@
-#
-# Copyright 2021-2023 Aklivity Inc.
-#
-# Aklivity licenses this file to you under the Apache License,
-# version 2.0 (the "License"); you may not use this file except in compliance
-# with the License. You may obtain a copy of the License at:
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-
-accept "zilla://streams/app0"
-        option zilla:window 8192
-        option zilla:transmission "duplex"
-
-accepted
-
-read zilla:begin.ext ${mqtt:matchBeginEx()
-                             .typeId(zilla:id("mqtt"))
-                             .session()
-                                .clientId("one")
-                                .will()
-                                    .topic("wills/one")
-                                    .format("TEXT")
-                                    .payload("client one session expired")
-                                    .build()
-                                .build()
-                             .build()}
-
-connected
-
-write zilla:data.empty
-write flush
-
-read zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("KEEP_ALIVE_EXPIRY")
-                        .build()}
-
-read closed
-write close
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/client.rpt
index 108080f362..aed7e6d713 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/client.rpt
@@ -21,23 +21,28 @@ connect "zilla://streams/app0"
 write zilla:begin.ext ${mqtt:beginEx()
                            .typeId(zilla:id("mqtt"))
                            .session()
+                              .flags("WILL", "CLEAN_START")
                               .clientId("one")
-                              .will()
-                                  .topic("wills/one")
-                                  .format("TEXT")
-                                  .payload("client one session expired")
-                                  .build()
                               .build()
                            .build()}
 
 connected
 
-read zilla:data.empty
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+write ${mqtt:will()
+               .topic("wills/one")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+write flush
 
-write zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("DISCONNECT")
-                        .build()}
+read zilla:data.empty
 
 write close
 read closed
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/server.rpt
index 94489d98e3..c570dab6f8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.normal.disconnect/server.rpt
@@ -23,24 +23,29 @@ accepted
 read zilla:begin.ext ${mqtt:matchBeginEx()
                              .typeId(zilla:id("mqtt"))
                              .session()
+                                .flags("WILL", "CLEAN_START")
                                 .clientId("one")
-                                .will()
-                                    .topic("wills/one")
-                                    .format("TEXT")
-                                    .payload("client one session expired")
-                                    .build()
                                 .build()
                              .build()}
 
 connected
 
+
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+read ${mqtt:will()
+               .topic("wills/one")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+
 write zilla:data.empty
 write flush
 
-read zilla:end.ext ${mqtt:endEx()
-                        .typeId(zilla:id("mqtt"))
-                        .reason("DISCONNECT")
-                        .build()}
-
 read closed
 write close
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/client.rpt
index ce41ce3f68..8129b052e5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/client.rpt
@@ -22,15 +22,24 @@ write zilla:begin.ext ${mqtt:beginEx()
                                    .typeId(zilla:id("mqtt"))
                                    .session()
                                       .clientId("one")
-                                      .will()
-                                          .topic("wills/one")
-                                          .flags("RETAIN")
-                                          .format("TEXT")
-                                          .payload("client one session expired")
-                                          .build()
                                       .build()
                                    .build()}
 
 connected
 
+write zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+write ${mqtt:will()
+               .topic("wills/one")
+               .flags("RETAIN")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+write flush
+
 read zilla:data.empty
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/server.rpt
index 7cbdb75f40..8bf27cb120 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/application/session.will.message.retain/server.rpt
@@ -24,16 +24,25 @@ read zilla:begin.ext ${mqtt:matchBeginEx()
                             .typeId(zilla:id("mqtt"))
                             .session()
                                .clientId("one")
-                               .will()
-                                   .topic("wills/one")
-                                   .flags("RETAIN")
-                                   .format("TEXT")
-                                   .payload("client one session expired")
-                                   .build()
                                .build()
                             .build()}
 
 connected
 
+
+read zilla:data.ext ${mqtt:dataEx()
+                             .typeId(zilla:id("mqtt"))
+                             .session()
+                                .kind("WILL")
+                                .build()
+                             .build()}
+
+read ${mqtt:will()
+               .topic("wills/one")
+               .flags("RETAIN")
+               .format("TEXT")
+               .payload("client one session expired")
+               .build()}
+
 write zilla:data.empty
 write flush
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/client.rpt
index e2ce9cf455..0a09934b3b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/server.rpt
index 6712eeeb12..becde28c74 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.abort/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/client.rpt
index 17253032c3..01bae13c04 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/server.rpt
index d1b4bfceb1..9f3305413e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.close/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/client.rpt
index 939934e70b..21af97d26a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/server.rpt
index 199ed1b4e5..11fe55d81a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/client.sent.reset/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/client.rpt
index 58ca55aadf..d7944ac3e7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/client.rpt
@@ -18,23 +18,23 @@ connect "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
   option zilla:byteorder "network"
-  option zilla:byteorder "network"
 
 connected
 
-write [0x10 0x18]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x05]                         # properties = maximum packet size
-      [0x27] 50                      # maximum packet size = 50
-      [0x00 0x06] "client"           # client id
+write [0x10 0x18]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x05]                        # properties = maximum packet size
+      [0x27] 50                     # maximum packet size = 50
+      [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 50                     # maximum packet size = 50
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/server.rpt
index fbc06eccd0..ad9b156305 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.exceeded/server.rpt
@@ -18,24 +18,24 @@ accept "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
   option zilla:byteorder "network"
-  option zilla:byteorder "network"
 
 accepted
 connected
 
-read  [0x10 0x18]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x05]                         # properties = maximum packet size
-      [0x27] 50                      # maximum packet size = 50
-      [0x00 0x06] "client"           # client id
+read  [0x10 0x18]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x05]                        # properties = maximum packet size
+      [0x27] 50                     # maximum packet size = 50
+      [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                    # CONNACK
-      [0x00]                         # flags = none
-      [0x00]                         # reason code
-      [0x00]                         # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 50                     # maximum packet size = 50
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/client.rpt
index a65921d8e9..dddff030bd 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/client.rpt
@@ -20,19 +20,20 @@ connect "zilla://streams/net0"
 
 connected
 
-write [0x10 0x18]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x05]                         # properties = maximum packet size
-      [0x27 0x00 0x32]               # maximum packet size = 50
-      [0x00 0x06] "client"           # client id
+write [0x10 0x18]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x05]                        # properties = maximum packet size
+      [0x27 0x00 0x32]              # maximum packet size = 50
+      [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                    # CONNACK
-      [0x00]                         # flags = none
-      [0x00]                         # reason code
-      [0x00]                         # properties = none
+read  [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/server.rpt
index 2821fc44de..b0bde6dc23 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.max.packet.size.server.ignores.exceeding.publish.packet/server.rpt
@@ -21,19 +21,20 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x18]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x05]                         # properties = maximum packet size
-      [0x27 0x00 0x32]               # maximum packet size = 50
-      [0x00 0x06] "client"           # client id
+read  [0x10 0x18]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x05]                        # properties = maximum packet size
+      [0x27 0x00 0x32]              # maximum packet size = 50
+      [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/client.rpt
index 18fcb7c354..e296e3aa88 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/client.rpt
@@ -29,8 +29,9 @@ write [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-read  [0x20 0x05]             # CONNACK
+read  [0x20 0x0a]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x02]                  # properties
+      [0x07]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
       [0x24 0x00]             # maximum qos = at most once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/server.rpt
index 4499d83b64..badb4b4bdf 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.maximum.qos.0/server.rpt
@@ -30,8 +30,9 @@ read  [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-write [0x20 0x05]             # CONNACK
+write [0x20 0x0a]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x02]                  # properties
+      [0x07]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
       [0x24 0x00]             # maximum qos = at most once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/client.rpt
index f5732d9ba7..b9b5d32130 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/client.rpt
@@ -30,7 +30,8 @@ write [0x10 0x21]                   # CONNECT
       [0x00 0x06] "client"          # client id
       [0x00 0x0c] "Bearer TOKEN"    # password
 
-read [0x20 0x03]                    # CONNACK
-     [0x00]                         # flags = none
-     [0x00]                         # reason code
-     [0x00]                         # properties = none
+read  [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/server.rpt
index c16e710bce..57871900b2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.password.authentication.successful/server.rpt
@@ -31,7 +31,8 @@ read  [0x10 0x21]                   # CONNECT
       [0x00 0x06] "client"          # client id
       [0x00 0x0c] "Bearer TOKEN"    # password
 
-write [0x20 0x03]                    # CONNACK
-      [0x00]                         # flags = none
-      [0x00]                         # reason code
-      [0x00]                         # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/client.rpt
new file mode 100644
index 0000000000..6a8b2df528
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/client.rpt
@@ -0,0 +1,42 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+connect "zilla://streams/net0"
+  option zilla:window 8192
+  option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+connected
+
+write [0x10 0xff 0x7f]                                 # CONNECT, remaining length = 16383
+      [0x00 0x04] "MQTT"                               # protocol name
+      [0x05]                                           # protocol version
+      [0x06]                                           # flags = will flag, clean start
+      [0x00 0x0a]                                      # keep alive = 10s
+      [0x00]                                           # properties
+      [0x00 0x03] "one"                                # client id
+      [0x02]                                           # will properties
+      [0x01 0x01]                                      # format = utf-8
+      [0x00 0x09] "wills/one"                          # will topic
+      [0xdf 0x3f] ${mqtt:randomBytes(16351)}           # will payload
+
+read [0x20 0x03]                                       # CONNACK
+     [0x00]                                            # flags = none
+     [0x95]                                            # reason = packet too large
+     [0x00]                                            # properties = none
+
+read closed
+write close
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/server.rpt
new file mode 100644
index 0000000000..5c7427a967
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.packet.too.large/server.rpt
@@ -0,0 +1,43 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+accept "zilla://streams/net0"
+  option zilla:window 8192
+  option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+accepted
+connected
+
+read  [0x10 0xff 0x7f]                                  # CONNECT, remaining length = 16383
+      [0x00 0x04] "MQTT"                                # protocol name
+      [0x05]                                            # protocol version
+      [0x06]                                            # flags = will flag, clean start
+      [0x00 0x0a]                                       # keep alive = 10s
+      [0x00]                                            # properties
+      [0x00 0x03] "one"                                 # client id
+      [0x02]                                            # will properties
+      [0x01 0x01]                                       # format = utf-8
+      [0x00 0x09] "wills/one"                           # will topic
+      [0xdf 0x3f] [0..16351]                            # will payload
+
+write [0x20 0x03]                                       # CONNACK
+      [0x00]                                            # flags = none
+      [0x95]                                            # reason = packet too large
+      [0x00]                                            # properties = none
+
+write close
+read closed
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/client.rpt
index 4716401c5a..b5bcdf864d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
-      [0x00]                        # reason = success
-      [0x00]                        # properties = none
+      [0x00]                        # reason code
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x10 0x13]                   # CONNECT
       [0x00 0x04] "MQTT"            # protocol name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/server.rpt
index be588902cc..b67de5c22f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.reject.second.connect/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason = success
-       [0x00]                        # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 read   [0x10 0x13]                   # CONNECT
        [0x00 0x04] "MQTT"            # protocol name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/client.rpt
index 242add14df..3f273dbfaf 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/client.rpt
@@ -29,8 +29,10 @@ write [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-read  [0x20 0x05]             # CONNACK
+read  [0x20 0x0a]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x02]                  # properties
+      [0x07]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
       [0x25 0x00]             # retain unavailable
+
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/server.rpt
index cdbb92a648..915ca3ba71 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.retain.not.supported/server.rpt
@@ -30,8 +30,9 @@ read  [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-write [0x20 0x05]             # CONNACK
+write [0x20 0x0a]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x02]                  # properties
+      [0x07]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
       [0x25 0x00]             # retain unavailable
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/client.rpt
index d3eaed1606..e529445593 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/client.rpt
@@ -29,8 +29,9 @@ write [0x10 0x0d]              # CONNECT
       [0x00]                   # properties = none
       [0x00 0x00]              # client id
 
-read  [0x20 0x2a]              # CONNACK
+read  [0x20 0x2f]              # CONNACK
       [0x00]                   # flags = none
       [0x00]                   # reason code
-      [0x27]                   # properties
+      [0x2c]                   # properties
+      [0x27] 66560             # maximum packet size = 66560
       [0x12 0x00 0x24] [0..36] # assigned clientId
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/server.rpt
index f4e35b2b1e..14425c0795 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.assigned.client.id/server.rpt
@@ -32,8 +32,9 @@ read  [0x10 0x0d]                           # CONNECT
       [0x00]                                # properties = none
       [0x00 0x00]                           # client id
 
-write [0x20 0x2a]                           # CONNACK
+write [0x20 0x2f]                           # CONNACK
       [0x00]                                # flags = none
       [0x00]                                # reason code
-      [0x27]                                # properties
+      [0x2c]                                # properties
+      [0x27] 66560                          # maximum packet size = 66560
       [0x12 0x00 0x24] ${assignedClientId}  # assigned clientId
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/client.rpt
index 90b2c6b917..a60102b57c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x06]                   # CONNACK
+read   [0x20 0x0b]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x03]                        # properties = server keep alive
+       [0x08]                        # properties = server keep alive
+       [0x27] 66560                  # maximum packet size = 66560
        [0x13] 10s                    # server keep alive = 10s
 
 read await WAIT_2_SECONDS
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/server.rpt
index 3af4304ce1..8f4267357c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.server.defined.keep.alive/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write  [0x20 0x06]                   # CONNACK
+write  [0x20 0x0b]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x03]                        # properties = server keep alive
+       [0x08]                        # properties = server keep alive
+       [0x27] 66560                  # maximum packet size = 66560
        [0x13] 10s                    # server keep alive = 10s
 
 write notify WAIT_2_SECONDS
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/client.rpt
index ccf49381b4..728ae4003a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/client.rpt
@@ -28,7 +28,6 @@ write [0x10 0x13]                   # CONNECT
       [0x00 0x3c]                   # keep alive = 60s
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
-
       [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
       [0x02]                        # properties
@@ -36,10 +35,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00 0x0a] "sensor/one"      # topic filter
       [0x20]                        # options = at-most-once
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x90 0x04]                   # SUBACK
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/server.rpt
index db105b99fc..1ed4dd5906 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.subscribe.unfragmented/server.rpt
@@ -36,12 +36,13 @@ read  [0x10 0x13]                   # CONNECT
       [0x00 0x0a] "sensor/one"      # topic filter
       [0x20]                        # options = at-most-once
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
-write  [0x90 0x04]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00]                        # reason code
+write [0x90 0x04]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00]                        # reason code
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/client.rpt
index 11aab482ff..ab94edaee7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/client.rpt
@@ -29,7 +29,8 @@ write [0x05]                  # protocol version
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-read [0x20 0x03]              # CONNACK
+read [0x20 0x08]              # CONNACK
      [0x00]                   # flags = none
      [0x00]                   # reason code
-     [0x00]                   # properties = none
+     [0x05]                   # properties
+     [0x27] 66560             # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/server.rpt
index 08b8a21115..7eeb5401f2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful.fragmented/server.rpt
@@ -22,15 +22,16 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x13]             # CONNECT
-      [0x00 0x04] "MQTT"      # protocol name      
-      [0x05]                  # protocol version
-      [0x02]                  # flags = clean start
-      [0x00 0x3c]             # keep alive = 60s
-      [0x00]                  # properties = none
-      [0x00 0x06] "client"    # client id
+read  [0x10 0x13]              # CONNECT
+      [0x00 0x04] "MQTT"       # protocol name
+      [0x05]                   # protocol version
+      [0x02]                   # flags = clean start
+      [0x00 0x3c]              # keep alive = 60s
+      [0x00]                   # properties = none
+      [0x00 0x06] "client"     # client id
 
-write [0x20 0x03]             # CONNACK
-      [0x00]                  # flags = none
-      [0x00]                  # reason code
-      [0x00]                  # properties = none    
+write [0x20 0x08]              # CONNACK
+      [0x00]                   # flags = none
+      [0x00]                   # reason code
+      [0x05]                   # properties
+      [0x27] 66560             # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/client.rpt
index 60cde0868b..05646c53a2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/client.rpt
@@ -29,7 +29,8 @@ write [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-read [0x20 0x03]              # CONNACK
+read [0x20 0x08]              # CONNACK
      [0x00]                   # flags = none
      [0x00]                   # reason code
-     [0x00]                   # properties = none
+     [0x05]                   # properties
+     [0x27] 66560             # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/server.rpt
index e7deccee13..7eeb5401f2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.successful/server.rpt
@@ -22,15 +22,16 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x13]             # CONNECT
-      [0x00 0x04] "MQTT"      # protocol name
-      [0x05]                  # protocol version
-      [0x02]                  # flags = clean start
-      [0x00 0x3c]             # keep alive = 60s
-      [0x00]                  # properties = none
-      [0x00 0x06] "client"    # client id
+read  [0x10 0x13]              # CONNECT
+      [0x00 0x04] "MQTT"       # protocol name
+      [0x05]                   # protocol version
+      [0x02]                   # flags = clean start
+      [0x00 0x3c]              # keep alive = 60s
+      [0x00]                   # properties = none
+      [0x00 0x06] "client"     # client id
 
-write [0x20 0x03]             # CONNACK
-      [0x00]                  # flags = none
-      [0x00]                  # reason code
-      [0x00]                  # properties = none    
+write [0x20 0x08]              # CONNACK
+      [0x00]                   # flags = none
+      [0x00]                   # reason code
+      [0x05]                   # properties
+      [0x27] 66560             # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/client.rpt
index 6ae62af4fa..36e31e274d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/client.rpt
@@ -28,12 +28,13 @@ write [0x10 0x21]                   # CONNECT
       [0x00 0x3c]                   # keep alive = 60s
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
-      [0x00 0x0c] "Bearer TOKEN"    # password
+      [0x00 0x0c] "Bearer TOKEN"    # username
 
-read [0x20 0x03]                    # CONNACK
-     [0x00]                         # flags = none
-     [0x00]                         # reason code
-     [0x00]                         # properties = none
+read  [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x30 0x39]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/server.rpt
index 97bd5176c3..4e6ff6a617 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/connect.username.authentication.successful/server.rpt
@@ -31,7 +31,8 @@ read  [0x10 0x21]                   # CONNECT
       [0x00 0x06] "client"          # client id
       [0x00 0x0c] "Bearer TOKEN"    # username
 
-write [0x20 0x03]                    # CONNACK
-      [0x00]                         # flags = none
-      [0x00]                         # reason code
-      [0x00]                         # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/client.rpt
index 4a82d8b390..e1fd8c7e1b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-read  [0x20 0x03]             # CONNACK
+read  [0x20 0x08]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x00]                  # properties = none
+      [0x05]                  # properties = none
+      [0x27] 66560            # maximum packet size = 66560
 
 read  [0xe0 0x02]             # DISCONNECT
       [0x8d]                  # reason = keep alive timeout
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/server.rpt
index bfbcbf1ea5..3990ba344c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.keep.alive.timeout/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-write [0x20 0x03]             # CONNACK
+write [0x20 0x08]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x00]                  # properties = none    
+      [0x05]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
 
 write [0xe0 0x02]             # DISCONNECT
       [0x8d]                  # reason = keep alive timeout
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/client.rpt
index fc5499f3d1..bfb44bde10 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/server.rpt
index ab8e3998a8..56422a43bd 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.after.subscribe.and.publish/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/client.rpt
index 467424a17c..19450a379d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0xe1 0x02]                   # malformed DISCONNECT
        [0x00]                        # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/server.rpt
index 61ac0df492..4d2e89d6ca 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect.reject.invalid.fixed.header.flags/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read   [0xe1 0x02]                   # malformed DISCONNECT
        [0x00]                        # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/client.rpt
index 0e4dccb94f..25b1f63b22 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]           # CONNECT
       [0x00]                # properties = none
       [0x00 0x06] "client"  # client id
 
-read  [0x20 0x03]           # CONNACK
+read  [0x20 0x08]           # CONNACK
       [0x00]                # flags = none
       [0x00]                # reason code
-      [0x00]                # properties = none
+      [0x05]                # properties
+      [0x27] 66560          # maximum packet size = 66560
 
 write [0xe0 0x02]           # DISCONNECT
       [0x00]                # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/server.rpt
index 8e28b450c8..1d7188a18c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/disconnect/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]             # CONNECT
       [0x00]                  # properties = none
       [0x00 0x06] "client"    # client id
 
-write [0x20 0x03]             # CONNACK
+write [0x20 0x08]             # CONNACK
       [0x00]                  # flags = none
       [0x00]                  # reason code
-      [0x00]                  # properties = none
+      [0x05]                  # properties
+      [0x27] 66560            # maximum packet size = 66560
 
 read  [0xe0 0x02]             # DISCONNECT
       [0x00]                  # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/client.rpt
index ee394def99..1da22ab03f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/client.rpt
@@ -21,35 +21,36 @@ connect "zilla://streams/net0"
 
 connected
 
-write  [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x01]                   # keep alive = 1s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
-
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x01]                   # keep alive = 1s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
+
+read  [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read await WAIT_1_SECOND
 
-write  [0xc0 0x00]                   # PINGREQ
+write [0xc0 0x00]                   # PINGREQ
 
-read   [0xd0 0x00]                   # PINGRESP
+read  [0xd0 0x00]                   # PINGRESP
 
 read await WAIT_1_SECOND2
 
-write  [0x82 0x12]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x01]                   # subscription id = 1
-       [0x00 0x0a] "sensor/one"      # topic filter
-       [0x20]                        # options = at-most-once
-
-read   [0x90 0x04]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00]                        # reason code
+write [0x82 0x12]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/one"      # topic filter
+      [0x20]                        # options = at-most-once
+
+read  [0x90 0x04]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00]                        # reason code
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/server.rpt
index 273ea6dbbf..68e12ef631 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping.keep.alive/server.rpt
@@ -22,35 +22,36 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x01]                   # keep alive = 1s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
-
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x01]                   # keep alive = 1s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
+
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 write notify WAIT_1_SECOND
 
-read   [0xc0 0x00]                   # PINGREQ
+read  [0xc0 0x00]                   # PINGREQ
 
-write  [0xd0 0x00]                   # PINGRESP
+write [0xd0 0x00]                   # PINGRESP
 
 write notify WAIT_1_SECOND2
 
-read   [0x82 0x12]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x01]                   # subscription id = 1
-       [0x00 0x0a] "sensor/one"      # topic filter
-       [0x20]                        # options = at-most-once
-
-write  [0x90 0x04]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00]                        # reason code
+read  [0x82 0x12]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/one"      # topic filter
+      [0x20]                        # options = at-most-once
+
+write [0x90 0x04]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00]                        # reason code
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/client.rpt
index 969c1907f5..b2fdfa4427 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x11]           # CONNECT
       [0x00]                # properties = none
       [0x00 0x04] "abcd"    # client id
 
-read  [0x20 0x03]           # CONNACK
+read  [0x20 0x08]           # CONNACK
       [0x00]                # flags = none
       [0x00]                # reason code
-      [0x00]                # properties = none
+      [0x05]                # properties
+      [0x27] 66560          # maximum packet size = 66560
 
 write [0xc0 0x00]           # PINGREQ
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/server.rpt
index dbe9b48291..8c6e16f18e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/ping/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x11]           # CONNECT
       [0x00]                # properties = none
       [0x00 0x04] "abcd"    # client id
 
-write [0x20 0x03]           # CONNACK
+write [0x20 0x08]           # CONNACK
       [0x00]                # flags = none
       [0x00]                # reason code
-      [0x00]                # properties = none
+      [0x05]                # properties
+      [0x27] 66560          # maximum packet size = 66560
 
 read  [0xc0 0x00]           # PINGREQ
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/client.rpt
index b035043ef2..18ad3ac68d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x0d]                    # PUBLISH flags = at-most-once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/server.rpt
index c6835ad4bd..a47c03c9d6 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x0d]                    # PUBLISH flags = at-most-once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/client.rpt
index 8d2b0d7dc1..8e180c26df 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x31 0x0d]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/server.rpt
index a5a00b450f..b621d3f44d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.empty.retained.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x31 0x0d]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/client.rpt
index b39fec144d..6b0f47417c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x17]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/server.rpt
index bd6707ead1..4c3f098582 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.message.with.topic.alias/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x17]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/client.rpt
index 59ea2e689b..4d8a3ad977 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/client.rpt
@@ -29,11 +29,12 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
-      [0x22 0x00 0x01]               # topic alias maximum = 1
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
+      [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x18]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/server.rpt
index 382be31814..e7aaa2b47b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.no.carry.over.topic.alias/server.rpt
@@ -30,11 +30,12 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
-      [0x22 0x00 0x01]               # topic alias maximum = 1
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
+      [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x18]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/client.rpt
index 7816cde38d..ab309028ed 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x02]               # topic alias maximum = 2
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 2s                      # topic alias maximum = 2
 
 write [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/server.rpt
index e3acfcf586..d8e29935cf 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.distinct/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x02]               # topic alias maximum = 2
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 2s                      # topic alias maximum = 2
 
 read  [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/client.rpt
index f407519a5b..2e9d8afc44 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x18]                    # PUBLISH
@@ -67,10 +68,11 @@ write [0x10 0x17]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x07] "client2"          # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x0e]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/server.rpt
index 9253a6b7ef..f43b342306 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.invalid.scope/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x18]                    # PUBLISH
@@ -62,10 +63,11 @@ read  [0x10 0x17]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x07] "client2"          # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x0e]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/client.rpt
index 842cf10a1a..573328e173 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/server.rpt
index 535fe0eb68..b9154917d0 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.repeated/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/client.rpt
index 5555adf084..8a39558db3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/server.rpt
index 63ac197384..5d627dd331 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.messages.with.topic.alias.replaced/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x18]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/client.rpt
index 6e2fca673e..9c790a6c1f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/server.rpt
index 2380868209..d876b2b6c1 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.unfragmented/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/client.rpt
index e179751732..e8a61b496e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/server.rpt
index a0b2569596..58cbb0a288 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages.with.delay/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/client.rpt
index ae7414919b..ff642d5d12 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/server.rpt
index a0b2569596..58cbb0a288 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.multiple.messages/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x15]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/client.rpt
index 4030fe9abf..50d990ab95 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x39]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/server.rpt
index 463fc62f5b..49d54fcd5b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message.subscribe.unfragmented/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x39]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
@@ -44,14 +45,14 @@ read  [0x30 0x39]                    # PUBLISH
       [0x08 0x00 0x0a] "sensor/one"  # response topic
       [0x09 0x00 0x04] "info"        # correlation data
       "message"                      # payload
-      [0x82 0x12]                   # SUBSCRIBE
-      [0x00 0x01]                   # packet id = 1
-      [0x02]                        # properties
-      [0x0b 0x01]                   # subscription id = 1
-      [0x00 0x0a] "sensor/two"      # topic filter
-      [0x20]                        # options = at-most-once
+      [0x82 0x12]                    # SUBSCRIBE
+      [0x00 0x01]                    # packet id = 1
+      [0x02]                         # properties
+      [0x0b 0x01]                    # subscription id = 1
+      [0x00 0x0a] "sensor/two"       # topic filter
+      [0x20]                         # options = at-most-once
 
-write [0x90 0x04]                   # SUBACK
-      [0x00 0x01]                   # packet id = 1
-      [0x00]                        # properties = none
-      [0x00]                        # reason code
+write [0x90 0x04]                    # SUBACK
+      [0x00 0x01]                    # packet id = 1
+      [0x00]                         # properties = none
+      [0x00]                         # reason code
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/client.rpt
index 44a0e55da2..9ab4ebe435 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x39]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/server.rpt
index 211a29685b..9e2f2cbd0c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.one.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x39]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/client.rpt
index ce2f3c1d7b..fa4565b101 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x31 0x28]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/server.rpt
index 48bd9f4b0e..6a78f222dc 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.client.sent.subscription.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x31 0x28]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/client.rpt
index bf56176077..ffa3fd696a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x36]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/server.rpt
index ad423bf5d9..2412c0df9f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.invalid.payload.format/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x36]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/client.rpt
new file mode 100644
index 0000000000..04c7b54dbc
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/client.rpt
@@ -0,0 +1,54 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+connect "zilla://streams/net0"
+   option zilla:window 8192
+   option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+connected
+
+write [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties = none
+      [0x00 0x06] "client"           # client id
+
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 9216                    # maximum packet size = 9216
+
+write [0x30 0xff 0x7f]               # PUBLISH, remaining length = 16383
+      [0x00 0x0a] "sensor/one"       # topic name
+      [0x25]                         # properties
+      [0x02] 0x0f                    # expiry = 15 seconds
+      [0x03 0x00 0x07] "message"     # content type
+      [0x01 0x01]                    # format = utf-8
+      [0x08 0x00 0x0a] "sensor/one"  # response topic
+      [0x09 0x00 0x04] "info"        # correlation data
+      ${mqtt:randomBytes(16326)}     # payload
+
+read  [0xe0 0x02]                    # disconnect header
+      [0x95]                         # reason = packet too large
+      [0x00]                         # properties = none
+
+read closed
+write close
+
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/server.rpt
new file mode 100644
index 0000000000..863be0b74c
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.packet.too.large/server.rpt
@@ -0,0 +1,55 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+accept "zilla://streams/net0"
+  option zilla:window 8192
+  option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+accepted
+connected
+
+read  [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties = none
+      [0x00 0x06] "client"           # client id
+
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 9216                    # maximum packet size = 9216
+
+read  [0x30 0xff 0x7f]               # PUBLISH, remaining length = 16383
+      [0x00 0x0a] "sensor/one"       # topic name
+      [0x25]                         # properties
+      [0x02] 0x0f                    # expiry = 15 seconds
+      [0x03 0x00 0x07] "message"     # content type
+      [0x01 0x01]                    # format = utf-8
+      [0x08 0x00 0x0a] "sensor/one"  # response topic
+      [0x09 0x00 0x04] "info"        # correlation data
+      [0..16326]                     # payload
+
+write [0xe0 0x02]                    # disconnect header
+      [0x95]                         # reason = packet too large
+      [0x00]                         # properties = none
+
+write close
+read closed
+
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/client.rpt
index aa6fe7845a..fe2d55b49f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x3b]                    # PUBLISH, qos = at most once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/server.rpt
index 270f88990c..345786e4d7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos0.with.packet.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x3b]                    # PUBLISH, qos = at most once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/client.rpt
index e211184ae2..5101f466af 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x05]                    # CONNACK
+read  [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x24 0x00]                    # maximum qos = at most once
 
 write [0x32 0x39]                    # PUBLISH, qos = at least once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/server.rpt
index 4ece5acfa3..379e720cfe 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x05]                    # CONNACK
+write [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x24 0x00]                    # maximum qos = at most once
 
 read  [0x32 0x39]                    # PUBLISH, qos = at least once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/client.rpt
index 42bbd0b808..5e94229103 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x32 0x39]                    # PUBLISH, qos = at least once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/server.rpt
index 5acb55f014..d18a86c6ce 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos1.without.packet.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x32 0x39]                    # PUBLISH, qos = at least once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/client.rpt
index a673d141f9..cee75c68e9 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x05]                    # CONNACK
+read  [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x24 0x00]                    # maximum qos = at most once
 
 write [0x34 0x39]                    # PUBLISH, qos = exactly once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/server.rpt
index 40970e6b00..490588aa66 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x05]                    # CONNACK
+write [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x24 0x00]                    # maximum qos = at most once
 
 read  [0x34 0x39]                    # PUBLISH, qos = exactly once
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/client.rpt
index c2a98921f4..865f19c5fc 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x34 0x39]                    # PUBLISH, qos = exactly once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/server.rpt
index 50dc4d2a37..12b201a50f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.qos2.without.packet.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x34 0x39]                    # PUBLISH, qos = exactly once
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/client.rpt
index 01a18efe7f..a62e263d13 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x05]                    # CONNACK
+read  [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x25 0x00]                    # retain unavailable
 
 write [0x31 0x26]                    # PUBLISH flags = at-most-once, retain
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/server.rpt
index 155185b854..00308505a8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.retain.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x05]                    # CONNACK
+write [0x20 0x0a]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x02]                         # properties
+      [0x07]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x25 0x00]                    # retain unavailable
 
 read  [0x31 0x26]                    # PUBLISH flags = at-most-once, retain
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/client.rpt
index ce747d5f28..861eb55fdf 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x17]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/server.rpt
index 30c71e3d95..5dd6de1f31 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.exceeds.maximum/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x17]                    # PUBLISH
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/client.rpt
index f0465d8ee5..7aa1203da8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/client.rpt
@@ -30,10 +30,11 @@ write [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x06]                    # CONNACK
+read  [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 write [0x30 0x1a]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/server.rpt
index be89b64955..c0932a2468 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.reject.topic.alias.repeated/server.rpt
@@ -31,10 +31,11 @@ read  [0x10 0x16]                    # CONNECT
       [0x22 0x00 0x01]               # topic alias maximum = 1
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x06]                    # CONNACK
+write [0x20 0x0b]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x03]                         # properties
+      [0x08]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
       [0x22] 1s                      # topic alias maximum = 1
 
 read  [0x30 0x1a]                    # PUBLISH
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/client.rpt
index 1cd14952d2..1c2057ce46 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/server.rpt
index 31fdbc9e16..10ee4d4df2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.retained/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/client.rpt
index 2af757f188..d40221b8e3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x30 0x15]                    # PUBLISH
       [0x00 0x0b] "sensor/none"      # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/server.rpt
index 265527cf55..69db05a2ac 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.topic.not.routed/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x30 0x15]                    # PUBLISH
       [0x00 0x0b] "sensor/none"      # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/client.rpt
index 35429cd5d6..e15d7931c4 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/client.rpt
@@ -21,26 +21,27 @@ connect "zilla://streams/net0"
 
 connected
 
-write [0x10 0x13]                   # CONNECT
-      [0x00 0x04] "MQTT"            # protocol name
-      [0x05]                        # protocol version
-      [0x02]                        # flags = clean start
-      [0x00 0x3c]                   # keep alive = 60s
-      [0x00]                        # properties = none
-      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+write [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-read  [0x20 0x03]                   # CONNACK
-      [0x00]                        # flags = none
-      [0x00]                        # reason code
-      [0x00]                        # properties = none
+read  [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-write [0x31 0x4a]                                 # PUBLISH
-      [0x00 0x0a] "/sensors/1"                    # topic name
-      [0x14]                                      # properties
-      [0x26]                                      # user property id
-      [0x00 0x04] "row1"                          # user property key
-      [0x00 0x01] "1"                             # user property value
-      [0x26]                                      # user property id
-      [0x00 0x04] "row2"                          # user property key
-      [0x00 0x01] "2"                             # user property value
+write [0x31 0x4a]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x14]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "1"                                         # user property value
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row2"                                      # user property key
+      [0x00 0x01] "2"                                         # user property value
       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/server.rpt
index 84e1702313..4470270545 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.distinct/server.rpt
@@ -22,26 +22,27 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+read  [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-read   [0x31 0x4a]                                 # PUBLISH
-       [0x00 0x0a] "/sensors/1"                    # topic name
-       [0x14]                                      # properties
-       [0x26]                                      # user property id
-       [0x00 0x04] "row1"                          # user property key
-       [0x00 0x01] "1"                             # user property value
-       [0x26]                                      # user property id
-       [0x00 0x04] "row2"                          # user property key
-       [0x00 0x01] "2"                             # user property value
-       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
+read  [0x31 0x4a]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x14]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "1"                                         # user property value
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row2"                                      # user property key
+      [0x00 0x01] "2"                                         # user property value
+      "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/client.rpt
index ba0327ee3f..7ee13a5f8b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/client.rpt
@@ -21,26 +21,27 @@ connect "zilla://streams/net0"
 
 connected
 
-write [0x10 0x13]                   # CONNECT
-      [0x00 0x04] "MQTT"            # protocol name
-      [0x05]                        # protocol version
-      [0x02]                        # flags = clean start
-      [0x00 0x3c]                   # keep alive = 60s
-      [0x00]                        # properties = none
-      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+write [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-read  [0x20 0x03]                   # CONNACK
-      [0x00]                        # flags = none
-      [0x00]                        # reason code
-      [0x00]                        # properties = none
+read  [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-write [0x31 0x4a]                                 # PUBLISH
-      [0x00 0x0a] "/sensors/1"                    # topic name
-      [0x14]                                      # properties
-      [0x26]                                      # user property id
-      [0x00 0x04] "row1"                          # user property key
-      [0x00 0x01] "1"                             # user property value
-      [0x26]                                      # user property id
-      [0x00 0x04] "row1"                          # user property key
-      [0x00 0x01] "2"                             # user property value
+write [0x31 0x4a]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x14]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "1"                                         # user property value
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "2"                                         # user property value
       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/server.rpt
index 1b5899fe62..0186b1e4aa 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.properties.repeated/server.rpt
@@ -22,26 +22,27 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+read  [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-read   [0x31 0x4a]                                 # PUBLISH
-       [0x00 0x0a] "/sensors/1"                    # topic name
-       [0x14]                                      # properties
-       [0x26]                                      # user property id
-       [0x00 0x04] "row1"                          # user property key
-       [0x00 0x01] "1"                             # user property value
-       [0x26]                                      # user property id
-       [0x00 0x04] "row1"                          # user property key
-       [0x00 0x01] "2"                             # user property value
-       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
+read  [0x31 0x4a]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x14]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "1"                                         # user property value
+      [0x26]                                                  # user property id
+      [0x00 0x04] "row1"                                      # user property key
+      [0x00 0x01] "2"                                         # user property value
+      "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/client.rpt
index 972f9f3f53..6e3ea77da4 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/client.rpt
@@ -21,23 +21,24 @@ connect "zilla://streams/net0"
 
 connected
 
-write [0x10 0x13]                   # CONNECT
-      [0x00 0x04] "MQTT"            # protocol name
-      [0x05]                        # protocol version
-      [0x02]                        # flags = clean start
-      [0x00 0x3c]                   # keep alive = 60s
-      [0x00]                        # properties = none
-      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+write [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-read  [0x20 0x03]                   # CONNACK
-      [0x00]                        # flags = none
-      [0x00]                        # reason code
-      [0x00]                        # properties = none
+read  [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-write [0x31 0x3f]                                 # PUBLISH
-      [0x00 0x0a] "/sensors/1"                    # topic name
-      [0x09]                                      # properties
-      [0x26]                                      # user property id
-      [0x00 0x03] "row"                           # user property key
-      [0x00 0x01] "1"                             # user property value
+write [0x31 0x3f]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x09]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x03] "row"                                       # user property key
+      [0x00 0x01] "1"                                         # user property value
       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/server.rpt
index bc00e3d81e..e4f952dd8b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/publish.with.user.property/server.rpt
@@ -22,23 +22,24 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"          # client id
+read  [0x10 0x31]                                             # CONNECT
+      [0x00 0x04] "MQTT"                                      # protocol name
+      [0x05]                                                  # protocol version
+      [0x02]                                                  # flags = clean start
+      [0x00 0x3c]                                             # keep alive = 60s
+      [0x00]                                                  # properties = none
+      [0x00 0x24] "755452d5-e2ef-4113-b9c6-2f53de96fd76"      # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                                             # CONNACK
+      [0x00]                                                  # flags = none
+      [0x00]                                                  # reason code
+      [0x05]                                                  # properties = none
+      [0x27] 66560                                            # maximum packet size = 66560
 
-read   [0x31 0x3f]                                 # PUBLISH
-       [0x00 0x0a] "/sensors/1"                    # topic name
-       [0x09]                                      # properties
-       [0x26]                                      # user property id
-       [0x00 0x03] "row"                           # user property key
-       [0x00 0x01] "1"                             # user property value
-       "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
+read  [0x31 0x3f]                                             # PUBLISH
+      [0x00 0x0a] "/sensors/1"                                # topic name
+      [0x09]                                                  # properties
+      [0x26]                                                  # user property id
+      [0x00 0x03] "row"                                       # user property key
+      [0x00 0x01] "1"                                         # user property value
+      "{\"id\":\"1\",\"unit\":\"CELSIUS\",\"value\":\"189\"}" # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/client.rpt
index 40167198c0..5d745bb68a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x00]                          # flags = none
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -67,15 +68,16 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x01]                          # flags = session present
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
 
+read  [0x20 0x08]                    # CONNACK
+      [0x01]                         # flags = session present
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
-read  [0x30 0x18]                   # PUBLISH
-      [0x00 0x0a] "sensor/one"      # topic name
-      [0x04]                        # properties
-      [0x0b 0x01]                   # subscription id = 1
-      [0x01 0x01]                   # format = utf-8
-      "message"                     # payload
+read  [0x30 0x18]                    # PUBLISH
+      [0x00 0x0a] "sensor/one"       # topic name
+      [0x04]                         # properties
+      [0x0b 0x01]                    # subscription id = 1
+      [0x01 0x01]                    # format = utf-8
+      "message"                      # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/server.rpt
index e0e6e45a37..7aa9624f23 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.abort.reconnect.non.clean.start/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x13]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x00]                         # properties = none
-      [0x00 0x06] "client"           # client id
+read  [0x10 0x13]                     # CONNECT
+      [0x00 0x04] "MQTT"              # protocol name
+      [0x05]                          # protocol version
+      [0x02]                          # flags = clean start
+      [0x00 0x3c]                     # keep alive = 60s
+      [0x00]                          # properties = none
+      [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x00]                          # flags = none
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties = none
+      [0x27] 66560                    # maximum packet size = 66560
 
 read  [0x82 0x12]                     # SUBSCRIBE
       [0x00 0x01]                     # packet id = 1
@@ -42,10 +43,10 @@ read  [0x82 0x12]                     # SUBSCRIBE
       [0x00 0x0a] "sensor/one"        # topic filter
       [0x20]                          # options = at-most-once
 
-write  [0x90 0x04]                    # SUBACK
-       [0x00 0x01]                    # packet id = 1
-       [0x00]                         # properties = none
-       [0x00]                         # reason code
+write [0x90 0x04]                     # SUBACK
+      [0x00 0x01]                     # packet id = 1
+      [0x00]                          # properties = none
+      [0x00]                          # reason code
 
 read aborted
 write abort
@@ -62,14 +63,15 @@ read  [0x10 0x13]                     # CONNECT
       [0x00]                          # properties = none
       [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x01]                          # flags = session present
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties = none
+      [0x27] 66560                    # maximum packet size = 66560
 
-write [0x30 0x18]                   # PUBLISH
-      [0x00 0x0a] "sensor/one"      # topic name
-      [0x04]                        # properties
-      [0x0b 0x01]                   # subscription id = 1
-      [0x01 0x01]                   # format = utf-8
-      "message"                     # payload
+write [0x30 0x18]                     # PUBLISH
+      [0x00 0x0a] "sensor/one"        # topic name
+      [0x04]                          # properties
+      [0x0b 0x01]                     # subscription id = 1
+      [0x01 0x01]                     # format = utf-8
+      "message"                       # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/client.rpt
index 52ee3f7e37..35b8b9723b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x00]                          # flags = none
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -71,15 +72,15 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x01]                          # flags = session present
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
-
+read  [0x20 0x08]                    # CONNACK
+      [0x01]                         # flags = session present
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
-read  [0x30 0x18]                   # PUBLISH
-      [0x00 0x0a] "sensor/one"      # topic name
-      [0x04]                        # properties
-      [0x0b 0x01]                   # subscription id = 1
-      [0x01 0x01]                   # format = utf-8
-      "message"                     # payload
+read  [0x30 0x18]                    # PUBLISH
+      [0x00 0x0a] "sensor/one"       # topic name
+      [0x04]                         # properties
+      [0x0b 0x01]                    # subscription id = 1
+      [0x01 0x01]                    # format = utf-8
+      "message"                      # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/server.rpt
index 31bd2515d1..e2325eeaf2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.client.takeover/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                     # CONNECT
       [0x00]                          # properties
       [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x00]                          # flags = none
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties = none
+      [0x27] 66560                    # maximum packet size = 66560
 
 read  [0x82 0x12]                     # SUBSCRIBE
       [0x00 0x01]                     # packet id = 1
@@ -65,14 +66,15 @@ read  [0x10 0x13]                     # CONNECT
       [0x00]                          # properties = none
       [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x01]                          # flags = session present
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties = none
+      [0x27] 66560                    # maximum packet size = 66560
 
-write [0x30 0x18]                   # PUBLISH
-      [0x00 0x0a] "sensor/one"      # topic name
-      [0x04]                        # properties
-      [0x0b 0x01]                   # subscription id = 1
-      [0x01 0x01]                   # format = utf-8
-      "message"                     # payload
\ No newline at end of file
+write [0x30 0x18]                     # PUBLISH
+      [0x00 0x0a] "sensor/one"        # topic name
+      [0x04]                          # properties
+      [0x0b 0x01]                     # subscription id = 1
+      [0x01 0x01]                     # format = utf-8
+      "message"                       # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/client.rpt
new file mode 100644
index 0000000000..29b4a77410
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/client.rpt
@@ -0,0 +1,40 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+connect "zilla://streams/net0"
+  option zilla:window 8192
+  option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+connected
+
+write [0x10 0x3a]                                      # CONNECT
+      [0x00 0x04] "MQTT"                               # protocol name
+      [0x05]                                           # protocol version
+      [0x26]                                           # flags = will retain, will flag, clean start
+      [0x00 0x0a]                                      # keep alive = 10s
+      [0x00]                                           # properties
+      [0x00 0x03] "one"                                # client id
+      [0x02]                                           # will properties
+      [0x01 0x01]                                      # format = utf-8
+      [0x00 0x09] "wills/one"                          # will topic
+write [0x00 0x1a] "client one session expired"         # will payload
+
+read  [0x20 0x08]                                      # CONNACK
+      [0x00]                                           # flags = none
+      [0x00]                                           # reason code
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/server.rpt
new file mode 100644
index 0000000000..d1f8667469
--- /dev/null
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.payload.fragmented/server.rpt
@@ -0,0 +1,41 @@
+#
+# Copyright 2021-2023 Aklivity Inc.
+#
+# Aklivity licenses this file to you under the Apache License,
+# version 2.0 (the "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+
+accept "zilla://streams/net0"
+  option zilla:window 8192
+  option zilla:transmission "duplex"
+  option zilla:byteorder "network"
+
+accepted
+connected
+
+read  [0x10 0x3a]                                      # CONNECT
+      [0x00 0x04] "MQTT"                               # protocol name
+      [0x05]                                           # protocol version
+      [0x26]                                           # flags = will retain, will flag, clean start
+      [0x00 0x0a]                                      # keep alive = 10s
+      [0x00]                                           # properties
+      [0x00 0x03] "one"                                # client id
+      [0x02]                                           # will properties
+      [0x01 0x01]                                      # format = utf-8
+      [0x00 0x09] "wills/one"                          # will topic
+      [0x00 0x1a] "client one session expired"         # will payload
+
+write [0x20 0x08]                                      # CONNACK
+      [0x00]                                           # flags = none
+      [0x00]                                           # reason code
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/client.rpt
index 48cba5d50c..9f051d9142 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/client.rpt
@@ -18,21 +18,21 @@ connect "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
   option zilla:byteorder "network"
-  option zilla:byteorder "network"
 
 connected
 
-write [0x10 0x10]                                             # CONNECT
-      [0x00 0x04] "MQTT"                                      # protocol name
-      [0x05]                                                  # protocol version
-      [0x00]                                                  # flags = none
-      [0x00 0x3c]                                             # keep alive = 60s
-      [0x05]                                                  # properties
-      [0x11] 1                                                # session expiry interval
-      [0x00 0x03] "one"                                       # client id
+write [0x10 0x10]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x00]                         # flags = none
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x05]                         # properties
+      [0x11] 1                       # session expiry interval
+      [0x00 0x03] "one"              # client id
 
-read  [0x20 0x03]                                             # CONNACK
-      [0x00]                                                  # flags = none
-      [0x00]                                                  # reason code
-      [0x00]                                                  # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/server.rpt
index 4fddefb67b..ad0d678c0c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.connect.with.session.expiry/server.rpt
@@ -18,21 +18,21 @@ accept "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
   option zilla:byteorder "network"
-  option zilla:byteorder "network"
 
 accepted
 connected
 
-read  [0x10 0x10]                                             # CONNECT
-      [0x00 0x04] "MQTT"                                      # protocol name
-      [0x05]                                                  # protocol version
-      [0x00]                                                  # flags = none
-      [0x00 0x3c]                                             # keep alive = 60s
-      [0x05]                                                  # properties
-      [0x11] 1                                                # session expiry interval
-      [0x00 0x03] "one"                                       # client id
+read  [0x10 0x10]                          # CONNECT
+      [0x00 0x04] "MQTT"                   # protocol name
+      [0x05]                               # protocol version
+      [0x00]                               # flags = none
+      [0x00 0x3c]                          # keep alive = 60s
+      [0x05]                               # properties
+      [0x11] 1                             # session expiry interval
+      [0x00 0x03] "one"                    # client id
 
-write [0x20 0x03]                                             # CONNACK
-      [0x00]                                                  # flags = none
-      [0x00]                                                  # reason code
-      [0x00]                                                  # properties = none
+write [0x20 0x08]                          # CONNACK
+      [0x00]                               # flags = none
+      [0x00]                               # reason code
+      [0x05]                               # properties = none
+      [0x27] 66560                         # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/client.rpt
index 1028ffd030..9442e69a80 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x00]                          # flags = none
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -60,7 +61,7 @@ connect await FIRST_CONNECTED
         "zilla://streams/net0"
       option zilla:window 8192
       option zilla:transmission "duplex"
-  option zilla:byteorder "network"
+      option zilla:byteorder "network"
 
 connected
 
@@ -72,7 +73,8 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read [0x20 0x03]                     # CONNACK
-     [0x00]                          # flags = none
-     [0x00]                          # reason code
-     [0x00]                          # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/server.rpt
index 7a36e1223c..152272502b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.exists.clean.start/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x13]                     # CONNECT
-      [0x00 0x04] "MQTT"              # protocol name
-      [0x05]                          # protocol version
-      [0x02]                          # flags = clean start
-      [0x00 0x3c]                     # keep alive = 60s
-      [0x00]                          # properties
-      [0x00 0x06] "client"            # client id
+read  [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties
+      [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                     # CONNACK
-      [0x00]                          # flags = none
-      [0x00]                          # reason code
-      [0x00]                          # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -47,9 +48,9 @@ write [0x90 0x04]                    # SUBACK
       [0x00]                         # properties = none
       [0x00]                         # reason code
 
-write [0xe0 0x02]                     # DISCONNECT
-      [0x8e]                          # session taken over
-      [0x00]                          # properties = none
+write [0xe0 0x02]                    # DISCONNECT
+      [0x8e]                         # session taken over
+      [0x00]                         # properties = none
 
 write close
 read closed
@@ -58,15 +59,16 @@ read closed
 accepted
 connected
 
-read  [0x10 0x13]                     # CONNECT
-      [0x00 0x04] "MQTT"              # protocol name
-      [0x05]                          # protocol version
-      [0x02]                          # flags = clean start
-      [0x00 0x3c]                     # keep alive = 60s
-      [0x00]                          # properties = none
-      [0x00 0x06] "client"            # client id
+read  [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties = none
+      [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                     # CONNACK
-      [0x00]                          # flags = none
-      [0x00]                          # reason code
-      [0x00]                          # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/client.rpt
index 286b7882be..c5ee483918 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                          # CONNECT
       [0x00]                               # properties = none
       [0x00 0x06] "client"                 # client id
 
-read  [0x20 0x03]                          # CONNACK
+read  [0x20 0x08]                          # CONNACK
       [0x00]                               # flags = none
       [0x00]                               # reason code
-      [0x00]                               # properties
+      [0x05]                               # properties = none
+      [0x27] 66560                         # maximum packet size = 66560
 
 read  [0xe0 0x13]                          # DISCONNECT
       [0x9d]                               # reason code = Use another server
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/server.rpt
index 73a845c997..58120e20f9 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.server.redirect.after.connack/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                          # CONNECT
       [0x00]                               # properties = none
       [0x00 0x06] "client"                 # client id
 
-write [0x20 0x03]                          # CONNACK
+write [0x20 0x08]                          # CONNACK
       [0x00]                               # flags = none
       [0x00]                               # reason code
-      [0x00]                               # properties
+      [0x05]                               # properties = none
+      [0x27] 66560                         # maximum packet size = 66560
 
 write [0xe0 0x13]                          # DISCONNECT
       [0x9d]                               # reason code = Use another server
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/client.rpt
index 6c4ad76ad8..3124f2838a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/server.rpt
index ec1a3928af..f34e33da00 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.multiple.isolated/server.rpt
@@ -22,39 +22,40 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
-
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
-
-read   [0x82 0x12]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x01]                   # subscription id = 1
-       [0x00 0x0a] "sensor/one"      # topic filter
-       [0x20]                        # options = at-most-once
-
-write  [0x90 0x04]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00]                        # reason code
-
-read   [0x82 0x12]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x02]                   # subscription id = 2
-       [0x00 0x0a] "sensor/two"      # topic filter
-       [0x20]                        # options = at-most-once
-
-write  [0x90 0x04]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00]                        # reason codes
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
+
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
+
+read  [0x82 0x12]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/one"      # topic filter
+      [0x20]                        # options = at-most-once
+
+write [0x90 0x04]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00]                        # reason code
+
+read  [0x82 0x12]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x02]                   # subscription id = 2
+      [0x00 0x0a] "sensor/two"      # topic filter
+      [0x20]                        # options = at-most-once
+
+write [0x90 0x04]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00]                        # reason codes
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/client.rpt
index c6cab05d5b..429035ba02 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x30 0x16]                   # PUBLISH
       [0x00 0x0a] "sensor/one"      # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/server.rpt
index 47b29b72b7..04129949be 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe.via.session.state/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read  [0x10 0x13]                    # CONNECT
-      [0x00 0x04] "MQTT"             # protocol name
-      [0x05]                         # protocol version
-      [0x02]                         # flags = clean start
-      [0x00 0x3c]                    # keep alive = 60s
-      [0x00]                         # properties = none
-      [0x00 0x06] "client"           # client id
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x30 0x16]                   # PUBLISH
       [0x00 0x0a] "sensor/one"      # topic name
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/client.rpt
index 1568918c03..f862e9b39b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/server.rpt
index f346fdfe04..7c5aa38256 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.subscribe/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/client.rpt
index 30590722b8..7da1547868 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/client.rpt
@@ -21,53 +21,54 @@ connect "zilla://streams/net0"
 
 connected
 
-write  [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+write [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
-write  [0x82 0x1f]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x01]                   # subscription id = 1
-       [0x00 0x0a] "sensor/one"      # topic filter
-       [0x20]                        # options = at-most-once
+write [0x82 0x1f]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/one"      # topic filter
+      [0x20]                        # options = at-most-once
 
-       [0x00 0x0a] "sensor/two"      # topic filter
-       [0x20]                        # options = at-most-once
+      [0x00 0x0a] "sensor/two"      # topic filter
+      [0x20]                        # options = at-most-once
 
-write  [0xa2 0x0f]                   # UNSUBSCRIBE
-       [0x00 0x02]                   # packet id = 2
-       [0x00]                        # properties = none
-       [0x00 0x0a] "sensor/one"      # topic filter
+write [0xa2 0x0f]                   # UNSUBSCRIBE
+      [0x00 0x02]                   # packet id = 2
+      [0x00]                        # properties = none
+      [0x00 0x0a] "sensor/one"      # topic filter
 
-write  [0xa2 0x0f]                   # UNSUBSCRIBE
-       [0x00 0x03]                   # packet id = 3
-       [0x00]                        # properties = none
-       [0x00 0x0a] "sensor/two"      # topic filter
+write [0xa2 0x0f]                   # UNSUBSCRIBE
+      [0x00 0x03]                   # packet id = 3
+      [0x00]                        # properties = none
+      [0x00 0x0a] "sensor/two"      # topic filter
 
 write notify UNSUBSCRIBE_ALL_FILTERS
 
-read   [0x90 0x05]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00 0x00]                   # reason code
+read  [0x90 0x05]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00 0x00]                   # reason code
 
-read   [0xb0 0x04]                   # UNSUBACK
-       [0x00 0x02]                   # packet id = 2
-       [0x00]                        # properties = none
-       [0x00]                        # unsubscribe = success
+read  [0xb0 0x04]                   # UNSUBACK
+      [0x00 0x02]                   # packet id = 2
+      [0x00]                        # properties = none
+      [0x00]                        # unsubscribe = success
 
-read   [0xb0 0x04]                   # UNSUBACK
-       [0x00 0x03]                   # packet id = 3
-       [0x00]                        # properties = none
-       [0x00]                        # unsubscribe = success
+read  [0xb0 0x04]                   # UNSUBACK
+      [0x00 0x03]                   # packet id = 3
+      [0x00]                        # properties = none
+      [0x00]                        # unsubscribe = success
 
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/server.rpt
index 682fdc2853..908b65016f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe.deferred/server.rpt
@@ -22,38 +22,39 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
-read   [0x82 0x1f]                   # SUBSCRIBE
-       [0x00 0x01]                   # packet id = 1
-       [0x02]                        # properties
-       [0x0b 0x01]                   # subscription id = 1
-       [0x00 0x0a] "sensor/one"      # topic filter
-       [0x20]                        # options = at-most-once
+read  [0x82 0x1f]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/one"      # topic filter
+      [0x20]                        # options = at-most-once
 
-       [0x00 0x0a] "sensor/two"      # topic filter
-       [0x20]                        # options = at-most-once
+      [0x00 0x0a] "sensor/two"      # topic filter
+      [0x20]                        # options = at-most-once
 
-read   [0xa2 0x0f]                   # UNSUBSCRIBE
-       [0x00 0x02]                   # packet id = 2
-       [0x00]                        # properties = none
-       [0x00 0x0a] "sensor/one"      # topic filter
+read  [0xa2 0x0f]                   # UNSUBSCRIBE
+      [0x00 0x02]                   # packet id = 2
+      [0x00]                        # properties = none
+      [0x00 0x0a] "sensor/one"      # topic filter
 
-read   [0xa2 0x0f]                   # UNSUBSCRIBE
-       [0x00 0x03]                   # packet id = 3
-       [0x00]                        # properties = none
-       [0x00 0x0a] "sensor/two"      # topic filter
+read  [0xa2 0x0f]                   # UNSUBSCRIBE
+      [0x00 0x03]                   # packet id = 3
+      [0x00]                        # properties = none
+      [0x00 0x0a] "sensor/two"      # topic filter
 
 
 write  [0x90 0x05]                   # SUBACK
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/client.rpt
index 9aa1320c06..186b1e219e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/server.rpt
index 6275448c9e..cbc4de3ba7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.unsubscribe.after.subscribe/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/client.rpt
index 7b82dfc026..01fca82896 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/client.rpt
@@ -33,10 +33,11 @@ write [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-read  [0x20 0x03]                                      # CONNACK
+read  [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
 
 write [0xe0 0x02]                                      # DISCONNECT
       [0x04]                                           # disconnect with will message
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/server.rpt
index c4e6b53855..5996116b17 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.disconnect.with.will.message/server.rpt
@@ -34,10 +34,11 @@ read  [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-write [0x20 0x03]                                      # CONNACK
+write [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
 
 read  [0xe0 0x02]                                      # DISCONNECT
       [0x04]                                           # disconnect with will message
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/client.rpt
index 002f06c76a..cb4483c26d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/client.rpt
@@ -33,10 +33,11 @@ write [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-read  [0x20 0x03]                                      # CONNACK
+read  [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
 
 read  [0xe0 0x02]                                      # DISCONNECT
       [0x8d]                                           # reason = keep alive timeout
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/server.rpt
index 25c88efa05..eeea697dfb 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.no.ping.within.keep.alive/server.rpt
@@ -34,10 +34,11 @@ read  [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-write [0x20 0x03]                                      # CONNACK
+write [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
 
 write [0xe0 0x02]                                      # DISCONNECT
       [0x8d]                                           # reason = keep alive timeout
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/client.rpt
index 5b9b318d90..e1600b0b51 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/client.rpt
@@ -33,10 +33,11 @@ write [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-read  [0x20 0x03]                                      # CONNACK
+read  [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties
+      [0x27] 66560                                     # maximum packet size = 66560
 
 write [0xe0 0x02]                                      # DISCONNECT
       [0x00]                                           # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/server.rpt
index 883cc65b8e..6a1b53ddf3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.normal.disconnect/server.rpt
@@ -34,10 +34,11 @@ read  [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-write [0x20 0x03]                                      # CONNACK
+write [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
 
 read  [0xe0 0x02]                                      # DISCONNECT
       [0x00]                                           # normal disconnect
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/client.rpt
index 4059848eac..a3cb27a295 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/client.rpt
@@ -33,8 +33,8 @@ write [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-read  [0x20 0x03]                                      # CONNACK
+read  [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
-
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/server.rpt
index 9114402158..d1f8667469 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/session.will.message.retain/server.rpt
@@ -34,7 +34,8 @@ read  [0x10 0x3a]                                      # CONNECT
       [0x00 0x09] "wills/one"                          # will topic
       [0x00 0x1a] "client one session expired"         # will payload
 
-write [0x20 0x03]                                      # CONNACK
+write [0x20 0x08]                                      # CONNACK
       [0x00]                                           # flags = none
       [0x00]                                           # reason code
-      [0x00]                                           # properties = none
+      [0x05]                                           # properties = none
+      [0x27] 66560                                     # maximum packet size = 66560
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/client.rpt
index 6e205f28f4..e9bc4c9e79 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/server.rpt
index 1bec59b7a5..61944e33f0 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.get.retained.as.published/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/client.rpt
index f7fda12388..a2a9df28f2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x83 0x12]                   # malformed SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/server.rpt
index d2539d4a04..f05e044a79 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.fixed.header.flags/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x83 0x12]                   # malformed SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/client.rpt
index f4689b5087..b89bfcd670 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/server.rpt
index d19ea3313a..4938651215 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.invalid.topic.filter/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/client.rpt
index e206de2a14..4ed82006f8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x10]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/server.rpt
index 693ca30365..6f569a549b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.missing.id.receive.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/client.rpt
index cf10a9efac..f0e68093c7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/server.rpt
index 89fdc8124f..d7e28e9599 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.receive.response.topic.and.correlation.data/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/client.rpt
index 9de59055cb..503cc35fe3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/server.rpt
index 4eb5e8814a..8265375b49 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.user.properties.unaltered/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/client.rpt
index 8113efb2c4..e1491aafbc 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/server.rpt
index 04a5236644..118e92c629 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message.with.invalid.subscription.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/client.rpt
index 0b2b4fd884..299bbd396b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/server.rpt
index adce45abe2..71a46760c9 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.one.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/client.rpt
index 388c9dba39..4b1143221b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/server.rpt
index 25b8f9d763..2f5bb0a797 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.publish.no.local/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/client.rpt
index 20ffd331c2..ba6e06343f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client2"          # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
@@ -57,10 +58,11 @@ write [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client1"          # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/server.rpt
index dc1c3a6e66..436b990840 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.publish.retained.no.replay/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client2"          # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
@@ -53,10 +54,11 @@ read  [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client1"          # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/client.rpt
index 6e3a8ee494..1fbfe7f35c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client1"          # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
@@ -58,10 +59,11 @@ write [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client2"          # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/server.rpt
index 627d0b1f62..d67bc10f41 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.qos0.replay.retained.no.packet.id/server.rpt
@@ -30,12 +30,13 @@ read  [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client1"          # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
-read [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
+read  [0x31 0x14]                    # PUBLISH flags = at-most-once, retain
       [0x00 0x0a] "sensor/one"       # topic name
       [0x00]                         # properties
       "message"                      # payload
@@ -51,10 +52,11 @@ read  [0x10 0x14]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x07] "client2"          # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/client.rpt
index cb8c25a052..8a69f38f4a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/server.rpt
index 196f5130f1..e083bdc4d5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.overlapping.wildcard/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/client.rpt
index df3f3f98d4..1c5fd3fec3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x10]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/server.rpt
index 80e3f9db30..1c18976493 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message.wildcard/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x10]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/client.rpt
index 18cade375b..f293f66014 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-read  [0x20 0x03]                    # CONNACK
+read  [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/server.rpt
index 693ca30365..c7294e3326 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.receive.message/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                    # CONNECT
       [0x00]                         # properties = none
       [0x00 0x06] "client"           # client id
 
-write [0x20 0x03]                    # CONNACK
+write [0x20 0x08]                    # CONNACK
       [0x00]                         # flags = none
       [0x00]                         # reason code
-      [0x00]                         # properties = none
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -58,4 +59,4 @@ write [0x30 0x18]                    # PUBLISH
       [0x04]                         # properties
       [0x0b 0x01]                    # subscription id = 1
       [0x01 0x01]                    # format = utf-8
-      "message"                      # payload
\ No newline at end of file
+      "message"                      # payload
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/client.rpt
index b39b697ee0..f935b83e27 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/server.rpt
index fc394dde50..f915d88261 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.malformed.subscription.options/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/client.rpt
index 683ce043d8..e8d88fb786 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x10]                   # SUBSCRIBE
       [0x02]                        # properties
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/server.rpt
index 157566c112..4fe6b91fc7 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.packet.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x10]                   # SUBSCRIBE
       [0x02]                        # properties
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/client.rpt
index 9c36998f8a..02d4452a51 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x03]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/server.rpt
index 95e8e7aa4f..efa46acd52 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.missing.topic.filters/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x03]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/client.rpt
index 41e3ba9b00..b981a2ef53 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/server.rpt
index cbb98d694a..cae75dc440 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.no.local/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/client.rpt
index 089f74870e..e74f580404 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                                   # CONNECT
       [0x00]                                        # properties = none
       [0x00 0x06] "client"                          # client id
 
-read  [0x20 0x05]                                   # CONNACK
+read  [0x20 0x0a]                                   # CONNACK
       [0x00]                                        # flags = none
       [0x00]                                        # reason code
-      [0x02]                                        # properties
+      [0x07]                                        # properties
+      [0x27] 66560                                  # maximum packet size = 66560
       [0x2a 0x00]                                   # shared subscription unavailable
 
 write [0x82 0x23]                                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/server.rpt
index 6208375089..955a0daa5a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.shared.subscriptions.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                                   # CONNECT
       [0x00]                                        # properties = none
       [0x00 0x06] "client"                          # client id
 
-write [0x20 0x05]                                   # CONNACK
+write [0x20 0x0a]                                   # CONNACK
       [0x00]                                        # flags = none
       [0x00]                                        # reason code
-      [0x02]                                        # properties
+      [0x07]                                        # properties
+      [0x27] 66560                                  # maximum packet size = 66560
       [0x2a 0x00]                                   # shared subscription unavailable
 
 read  [0x82 0x23]                                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/client.rpt
index fcf5bf68a9..b4ab99c3ab 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x05]                   # CONNACK
+read  [0x20 0x0a]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x02]                        # properties
+      [0x07]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
       [0x29 0x00]                   # subscription identifiers unavailable
 
 write [0x82 0x12]                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/server.rpt
index 0a49b964f9..68c5d5f498 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.subscription.ids.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x05]                   # CONNACK
+write [0x20 0x0a]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x02]                        # properties
+      [0x07]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
       [0x29 0x00]                   # subscription identifiers unavailable
 
 read  [0x82 0x12]                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/client.rpt
index 43385085a0..85b8c1d71d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/server.rpt
index 097955c349..7d38220bd3 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.topic.filter.invalid.wildcard/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+read  [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties = none
+      [0x00 0x06] "client"           # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/client.rpt
index feedd243e0..4c01193032 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x05]                   # CONNACK
+read  [0x20 0x0a]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x02]                        # properties
+      [0x07]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
       [0x28 0x00]                   # wildcard subscription unavailable
 
 write [0x82 0x14]                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/server.rpt
index 74cfb47054..3a5baf1ab2 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.reject.wildcard.subscriptions.not.supported/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x05]                   # CONNACK
+write [0x20 0x0a]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x02]                        # properties
+      [0x07]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
       [0x28 0x00]                   # wildcard subscription unavailable
 
 read  [0x82 0x14]                   # SUBSCRIBE
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/client.rpt
index fa8fce65d0..564d33f3a5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/server.rpt
index 36109c91be..c17d971cc0 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.retain.as.published/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/client.rpt
index a04837c7ed..92d5d93d68 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x10]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/server.rpt
index ab94ad4d69..15e744e5f5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.multi.level.wildcard/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x10]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/client.rpt
index bae0c2cdc0..5c5f4b3eab 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x14]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/server.rpt
index 1c4a186cfd..96650fc06a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.and.multi.level.wildcard/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+read  [0x10 0x13]                    # CONNECT
+      [0x00 0x04] "MQTT"             # protocol name
+      [0x05]                         # protocol version
+      [0x02]                         # flags = clean start
+      [0x00 0x3c]                    # keep alive = 60s
+      [0x00]                         # properties = none
+      [0x00 0x06] "client"           # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties = none
+      [0x27] 66560                   # maximum packet size = 66560
 
 read  [0x82 0x14]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
@@ -42,7 +43,7 @@ read  [0x82 0x14]                    # SUBSCRIBE
       [0x00 0x0c] "sensor/+/1/#"     # topic filter
       [0x20]                         # options = at-most-once
 
-write [0x90 0x04]                   # SUBACK
-      [0x00 0x01]                   # packet id = 1
-      [0x00]                        # properties = none
-      [0x00]                        # reason codes
+write [0x90 0x04]                    # SUBACK
+      [0x00 0x01]                    # packet id = 1
+      [0x00]                         # properties = none
+      [0x00]                         # reason codes
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/client.rpt
index 6d9f1dcfe5..434ce18b3c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/server.rpt
index d5ef889cf7..7c914c5b51 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.exact/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/client.rpt
index b4f6fda4ab..a357131f7e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x10]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/server.rpt
index 42bd2af797..8aceb59618 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.single.level.wildcard/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x10]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/client.rpt
index cbd253e529..9ecd5c519f 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/server.rpt
index c1d9da82e3..972062cbac 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filter.two.single.level.wildcard/server.rpt
@@ -22,18 +22,19 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/client.rpt
index 0353af589c..e1d584fb47 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x1f]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/server.rpt
index 9589f5edd5..cfc2382136 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.both.exact/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/client.rpt
index 5ff09fbca3..ea62596109 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x1d]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/server.rpt
index 381f20cc2a..4de6727ff5 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.aggregated.exact.and.wildcard/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1d]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/client.rpt
index 7fd54dbcca..ecc300141d 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x1b]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/server.rpt
index fd29563aaa..435e7ef4eb 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.disjoint.wildcards/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1b]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/client.rpt
index a1a93748aa..c45a415a66 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/server.rpt
index ec1a3928af..45b23519ab 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.exact/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/client.rpt
index d5a44c06fa..51b7af1649 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x10]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/server.rpt
index 9cf15ef8bb..24855d9f90 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.both.wildcard/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x10]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/client.rpt
index 181b199d87..532b39fab8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/server.rpt
index 7d197e098a..aeadc62da8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.isolated.exact.and.wildcard/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/client.rpt
index 1312d627ea..412623486b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/client.rpt
@@ -29,10 +29,11 @@ write [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-read  [0x20 0x03]                   # CONNACK
+read  [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 write [0x82 0x1f]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/server.rpt
index 152943186e..13430ba6e8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/subscribe.topic.filters.overlapping.wildcards/server.rpt
@@ -22,30 +22,31 @@ accept "zilla://streams/net0"
 accepted
 connected
 
-read   [0x10 0x13]                   # CONNECT
-       [0x00 0x04] "MQTT"            # protocol name
-       [0x05]                        # protocol version
-       [0x02]                        # flags = clean start
-       [0x00 0x3c]                   # keep alive = 60s
-       [0x00]                        # properties = none
-       [0x00 0x06] "client"          # client id
+read  [0x10 0x13]                   # CONNECT
+      [0x00 0x04] "MQTT"            # protocol name
+      [0x05]                        # protocol version
+      [0x02]                        # flags = clean start
+      [0x00 0x3c]                   # keep alive = 60s
+      [0x00]                        # properties = none
+      [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+write [0x20 0x08]                   # CONNACK
+      [0x00]                        # flags = none
+      [0x00]                        # reason code
+      [0x05]                        # properties = none
+      [0x27] 66560                  # maximum packet size = 66560
 
-read  [0x82 0x1f]                    # SUBSCRIBE
-      [0x00 0x01]                    # packet id = 1
-      [0x02]                         # properties
-      [0x0b 0x01]                    # subscription id = 1
-      [0x00 0x0a] "sensor/+/#"       # topic filter
-      [0x20]                         # options = at-most-once
+read  [0x82 0x1f]                   # SUBSCRIBE
+      [0x00 0x01]                   # packet id = 1
+      [0x02]                        # properties
+      [0x0b 0x01]                   # subscription id = 1
+      [0x00 0x0a] "sensor/+/#"      # topic filter
+      [0x20]                        # options = at-most-once
 
-      [0x00 0x0a] "sensor/+/1"       # topic filter
-      [0x20]                         # options = at-most-once
+      [0x00 0x0a] "sensor/+/1"      # topic filter
+      [0x20]                        # options = at-most-once
 
-write  [0x90 0x05]                   # SUBACK
-       [0x00 0x01]                   # packet id = 1
-       [0x00]                        # properties = none
-       [0x00 0x00]                   # reason codes
+write [0x90 0x05]                   # SUBACK
+      [0x00 0x01]                   # packet id = 1
+      [0x00]                        # properties = none
+      [0x00 0x00]                   # reason codes
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/client.rpt
index e4c43817bd..604012c7b4 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/server.rpt
index e1fd92a605..33dc6f6484 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.after.subscribe/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/client.rpt
index f78f7c24ac..98237eb68a 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/server.rpt
index 8c640277d7..fa8c2a909b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.aggregated.topic.filters.both.exact/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/client.rpt
index beed4963a2..21707596c8 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/client.rpt
@@ -17,6 +17,7 @@
 connect "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
+  option zilla:byteorder "network"
 
 connected
 
@@ -28,10 +29,11 @@ write  [0x10 0x13]                     # CONNECT
        [0x00]                          # properties = none
        [0x00 0x06] "client"            # client id
 
-read   [0x20 0x03]                     # CONNACK
-       [0x00]                          # flags = none
-       [0x00]                          # reason code
-       [0x00]                          # properties = none
+read  [0x20 0x08]                      # CONNACK
+      [0x00]                           # flags = none
+      [0x00]                           # reason code
+      [0x05]                           # properties
+      [0x27] 66560                     # maximum packet size = 66560
 
 write [0x82 0x12]                      # SUBSCRIBE
       [0x00 0x01]                      # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/server.rpt
index a097586616..91fe86981e 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.subscription/server.rpt
@@ -17,6 +17,7 @@
 accept "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
+  option zilla:byteorder "network"
 
 accepted
 connected
@@ -29,10 +30,11 @@ read  [0x10 0x13]                     # CONNECT
       [0x00]                          # properties = none
       [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x00]                          # flags = none
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties
+      [0x27] 66560                    # maximum packet size = 66560
 
 read  [0x82 0x12]                     # SUBSCRIBE
       [0x00 0x01]                     # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/client.rpt
index 6d78cacf2d..1a15fe66bd 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/client.rpt
@@ -28,10 +28,11 @@ write  [0x10 0x13]                     # CONNECT
        [0x00]                          # properties = none
        [0x00 0x06] "client"            # client id
 
-read   [0x20 0x03]                     # CONNACK
-       [0x00]                          # flags = none
-       [0x00]                          # reason code
-       [0x00]                          # properties = none
+read  [0x20 0x08]                      # CONNACK
+      [0x00]                           # flags = none
+      [0x00]                           # reason code
+      [0x05]                           # properties
+      [0x27] 66560                     # maximum packet size = 66560
 
 write [0x82 0x12]                      # SUBSCRIBE
       [0x00 0x01]                      # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/server.rpt
index 381c026006..b99ca469e1 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.no.matching.topic.filter/server.rpt
@@ -17,6 +17,7 @@
 accept "zilla://streams/net0"
   option zilla:window 8192
   option zilla:transmission "duplex"
+  option zilla:byteorder "network"
 
 accepted
 connected
@@ -29,10 +30,11 @@ read  [0x10 0x13]                     # CONNECT
       [0x00]                          # properties = none
       [0x00 0x06] "client"            # client id
 
-write [0x20 0x03]                     # CONNACK
+write [0x20 0x08]                     # CONNACK
       [0x00]                          # flags = none
       [0x00]                          # reason code
-      [0x00]                          # properties = none
+      [0x05]                          # properties
+      [0x27] 66560                    # maximum packet size = 66560
 
 read  [0x82 0x12]                     # SUBSCRIBE
       [0x00 0x01]                     # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/client.rpt
index 1f2e757fe2..e3fc8f7e1b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/server.rpt
index 1627cbe50d..5eeb52dd97 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.publish.unfragmented/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/client.rpt
index d6832b017f..9788f07ecd 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/server.rpt
index 6059ab3187..25a951ba8b 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.invalid.fixed.header.flags/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x12]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/client.rpt
index a1bd515cb4..af9631abd1 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/server.rpt
index 2d3c972dac..a381e9a905 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.missing.packet.id/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/client.rpt
index ab7a2a81c3..1a0c4e388c 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write [0x82 0x12]                    # SUBSCRIBE
       [0x00 0x01]                    # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/server.rpt
index 3918ccccbe..6c370e90cd 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.reject.no.topic.filter/server.rpt
@@ -30,10 +30,11 @@ read  [0x10 0x13]                   # CONNECT
       [0x00]                        # properties = none
       [0x00 0x06] "client"          # client id
 
-write [0x20 0x03]                   # CONNACK
+write [0x20 0x08]                   # CONNACK
       [0x00]                        # flags = none
       [0x00]                        # reason code
-      [0x00]                        # properties = none
+      [0x05]                        # properties
+      [0x27] 66560                  # maximum packet size = 66560
 
 read  [0x82 0x12]                   # SUBSCRIBE
       [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/client.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/client.rpt
index ff26c0387b..9389db8c48 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/client.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/client.rpt
@@ -29,10 +29,11 @@ write  [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-read   [0x20 0x03]                   # CONNACK
-       [0x00]                        # flags = none
-       [0x00]                        # reason code
-       [0x00]                        # properties = none
+read  [0x20 0x08]                    # CONNACK
+      [0x00]                         # flags = none
+      [0x00]                         # reason code
+      [0x05]                         # properties
+      [0x27] 66560                   # maximum packet size = 66560
 
 write  [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/server.rpt b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/server.rpt
index e204f07d33..5bb6ef2c12 100644
--- a/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/server.rpt
+++ b/incubator/binding-mqtt.spec/src/main/scripts/io/aklivity/zilla/specs/binding/mqtt/streams/network/unsubscribe.topic.filter.single/server.rpt
@@ -30,10 +30,11 @@ read   [0x10 0x13]                   # CONNECT
        [0x00]                        # properties = none
        [0x00 0x06] "client"          # client id
 
-write  [0x20 0x03]                   # CONNACK
+write  [0x20 0x08]                   # CONNACK
        [0x00]                        # flags = none
        [0x00]                        # reason code
-       [0x00]                        # properties = none
+       [0x05]                        # properties = none
+       [0x27] 66560                  # maximum packet size = 66560
 
 read   [0x82 0x1f]                   # SUBSCRIBE
        [0x00 0x01]                   # packet id = 1
diff --git a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctionsTest.java b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctionsTest.java
index 44f2173d67..e6dd35db93 100644
--- a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctionsTest.java
+++ b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/internal/MqttFunctionsTest.java
@@ -29,12 +29,11 @@
 import org.junit.Test;
 import org.kaazing.k3po.lang.el.BytesMatcher;
 
-import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttEndReasonCode;
+import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttMessageFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttPayloadFormat;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.MqttSessionStateFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttBeginExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttDataExFW;
-import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttEndExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttFlushExFW;
 import io.aklivity.zilla.specs.binding.mqtt.internal.types.stream.MqttResetExFW;
 
@@ -61,20 +60,10 @@ public void shouldEncodeMqttSessionBeginExt()
         final byte[] array = MqttFunctions.beginEx()
             .typeId(0)
                 .session()
-                .clientId("client")
+                .flags("WILL", "CLEAN_START")
                 .expiry(30)
-                .serverReference("localhost:1883")
-                .will()
-                    .topic("will.client")
-                    .delay(20)
-                    .expiryInterval(15)
-                    .contentType("message")
-                    .format("TEXT")
-                    .responseTopic("will.client.response")
-                    .correlation("request-id-1")
-                    .userProperty("name", "value")
-                    .payload("client failed")
-                    .build()
+                .clientId("client")
+                .serverRef("localhost:1883")
                 .build()
             .build();
 
@@ -83,22 +72,9 @@ public void shouldEncodeMqttSessionBeginExt()
 
         assertEquals(2, mqttBeginEx.kind());
         assertEquals("client", mqttBeginEx.session().clientId().asString());
-        assertEquals("localhost:1883", mqttBeginEx.session().serverReference().asString());
+        assertEquals("localhost:1883", mqttBeginEx.session().serverRef().asString());
         assertEquals(30, mqttBeginEx.session().expiry());
-        assertEquals("will.client", mqttBeginEx.session().will().topic().asString());
-        assertEquals(20, mqttBeginEx.session().will().delay());
-        assertEquals(15, mqttBeginEx.session().will().expiryInterval());
-        assertEquals("message", mqttBeginEx.session().will().contentType().asString());
-        assertEquals("TEXT", mqttBeginEx.session().will().format().toString());
-        assertEquals("will.client.response", mqttBeginEx.session().will().responseTopic().asString());
-        assertEquals("request-id-1", mqttBeginEx.session().will().correlation()
-            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
-        assertNotNull(mqttBeginEx.session().will().properties()
-            .matchFirst(h ->
-                "name".equals(h.key().asString()) &&
-                    "value".equals(h.value().asString())));
-        assertEquals("client failed", mqttBeginEx.session().will().payload()
-            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
+        assertEquals(6, mqttBeginEx.session().flags());
     }
 
     @Test
@@ -107,8 +83,8 @@ public void shouldEncodeMqttSessionBeginExtWithoutWillMessage()
         final byte[] array = MqttFunctions.beginEx()
             .typeId(0)
                 .session()
-                .clientId("client")
                 .expiry(30)
+                .clientId("client")
                 .build()
             .build();
 
@@ -127,13 +103,6 @@ public void shouldEncodeMqttSessionBeginExtWithFlagsBytesWillPayload()
             .typeId(0)
                 .session()
                 .clientId("client")
-                .will()
-                    .topic("will.client")
-                    .qos("AT_LEAST_ONCE")
-                    .flags("RETAIN")
-                    .correlationBytes("request-id-1".getBytes(UTF_8))
-                    .payloadBytes(new byte[] {0, 1, 2, 3, 4, 5})
-                    .build()
                 .build()
             .build();
 
@@ -142,14 +111,6 @@ public void shouldEncodeMqttSessionBeginExtWithFlagsBytesWillPayload()
 
         assertEquals(2, mqttBeginEx.kind());
         assertEquals("client", mqttBeginEx.session().clientId().asString());
-        assertEquals("will.client", mqttBeginEx.session().will().topic().asString());
-        assertEquals(1, mqttBeginEx.session().will().flags());
-        assertEquals(0b0001, mqttBeginEx.session().will().flags());
-        assertEquals("BINARY", mqttBeginEx.session().will().format().toString());
-        assertEquals("request-id-1", mqttBeginEx.session().will().correlation()
-            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
-        assertArrayEquals(new byte[] {0, 1, 2, 3, 4, 5}, mqttBeginEx.session().will().payload()
-            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)).getBytes());
     }
 
     @Test
@@ -321,22 +282,10 @@ public void shouldMatchSessionBeginExtension() throws Exception
     {
         BytesMatcher matcher = MqttFunctions.matchBeginEx()
             .session()
-                .clientId("client")
+                .flags("CLEAN_START")
                 .expiry(10)
-                .serverReference("localhost:1883")
-                .will()
-                    .topic("willTopic")
-                    .delay(10)
-                    .qos("AT_MOST_ONCE")
-                    .flags("RETAIN")
-                    .expiryInterval(20)
-                    .contentType("message")
-                    .format("TEXT")
-                    .responseTopic("willResponseTopic")
-                    .correlation("correlationData")
-                    .userProperty("key1", "value1")
-                    .payload("will message")
-                    .build()
+                .clientId("client")
+                .serverRef("localhost:1883")
                 .build()
             .build();
 
@@ -346,23 +295,10 @@ public void shouldMatchSessionBeginExtension() throws Exception
             .wrap(new UnsafeBuffer(byteBuf), 0, byteBuf.capacity())
             .typeId(0x00)
             .session(s -> s
-                .clientId("client")
+                .flags(2)
                 .expiry(10)
-                .serverReference("localhost:1883")
-                .will(c ->
-                {
-                    c.topic("willTopic");
-                    c.delay(10);
-                    c.qos(0);
-                    c.flags(1);
-                    c.expiryInterval(20);
-                    c.contentType("message");
-                    c.format(f -> f.set(MqttPayloadFormat.TEXT));
-                    c.responseTopic("willResponseTopic");
-                    c.correlation(corr -> corr.bytes(b -> b.set("correlationData".getBytes(UTF_8))));
-                    c.propertiesItem(p -> p.key("key1").value("value1"));
-                    c.payload(p -> p.bytes(b -> b.set("will message".getBytes(UTF_8))));
-                }))
+                .clientId("client")
+                .serverRef("localhost:1883"))
             .build();
 
         assertNotNull(matcher.match(byteBuf));
@@ -373,8 +309,8 @@ public void shouldMatchSessionBeginExtensionWithEmptyFields() throws Exception
     {
         BytesMatcher matcher = MqttFunctions.matchBeginEx()
             .session()
-                .clientId("client")
                 .expiry(10)
+                .clientId("client")
                 .build()
             .build();
 
@@ -384,8 +320,8 @@ public void shouldMatchSessionBeginExtensionWithEmptyFields() throws Exception
             .wrap(new UnsafeBuffer(byteBuf), 0, byteBuf.capacity())
             .typeId(0x00)
             .session(s -> s
-                .clientId("client")
-                .expiry(10))
+                .expiry(10)
+                .clientId("client"))
             .build();
 
         assertNotNull(matcher.match(byteBuf));
@@ -396,20 +332,8 @@ public void shouldMatchSessionBeginExtensionWithBytes() throws Exception
     {
         BytesMatcher matcher = MqttFunctions.matchBeginEx()
                 .session()
-                .clientId("client")
                 .expiry(10)
-                    .will()
-                    .topic("willTopic")
-                    .delay(10)
-                    .qos("AT_MOST_ONCE")
-                    .expiryInterval(20)
-                    .contentType("message")
-                    .format("TEXT")
-                    .responseTopic("willResponseTopic")
-                    .correlationBytes("correlationData".getBytes(UTF_8))
-                    .userProperty("key1", "value1")
-                    .payloadBytes("will message".getBytes(UTF_8))
-                    .build()
+                .clientId("client")
                 .build()
             .build();
 
@@ -419,21 +343,8 @@ public void shouldMatchSessionBeginExtensionWithBytes() throws Exception
             .wrap(new UnsafeBuffer(byteBuf), 0, byteBuf.capacity())
             .typeId(0x00)
             .session(s -> s
-                .clientId("client")
                 .expiry(10)
-                .will(c ->
-                {
-                    c.topic("willTopic");
-                    c.delay(10);
-                    c.qos(0);
-                    c.expiryInterval(20);
-                    c.contentType("message");
-                    c.format(f -> f.set(MqttPayloadFormat.TEXT));
-                    c.responseTopic("willResponseTopic");
-                    c.correlation(corr -> corr.bytes(b -> b.set("correlationData".getBytes(UTF_8))));
-                    c.propertiesItem(p -> p.key("key1").value("value1"));
-                    c.payload(p -> p.bytes(b -> b.set("will message".getBytes(UTF_8))));
-                }))
+                .clientId("client"))
             .build();
 
         assertNotNull(matcher.match(byteBuf));
@@ -1218,6 +1129,23 @@ public void shouldEncodeMqttPublishDataExWithNullUserPropertyValue()
                     Objects.isNull(h.value().asString())));
     }
 
+    @Test
+    public void shouldEncodeMqttSessionDataEx()
+    {
+        final byte[] array = MqttFunctions.dataEx()
+            .typeId(0)
+            .session()
+                .kind("WILL")
+                .build()
+            .build();
+
+        DirectBuffer buffer = new UnsafeBuffer(array);
+        MqttDataExFW mqttPublishDataEx = new MqttDataExFW().wrap(buffer, 0, buffer.capacity());
+
+        assertEquals(0, mqttPublishDataEx.typeId());
+        assertEquals("WILL", mqttPublishDataEx.session().kind().toString());
+    }
+
     @Test
     public void shouldEncodeMqttSubscribeFlushEx()
     {
@@ -1240,32 +1168,18 @@ public void shouldEncodeMqttSubscribeFlushEx()
                     0b0001 == f.flags()));
     }
 
-    @Test
-    public void shouldEncodeMqttAbortExAsUnsubscribe()
-    {
-        final byte[] array = MqttFunctions.endEx()
-            .typeId(0)
-            .reason("KEEP_ALIVE_EXPIRY")
-            .build();
-
-        DirectBuffer buffer = new UnsafeBuffer(array);
-        MqttEndExFW mqttEndEx = new MqttEndExFW().wrap(buffer, 0, buffer.capacity());
-        assertEquals(0, mqttEndEx.typeId());
-        assertEquals(MqttEndReasonCode.KEEP_ALIVE_EXPIRY, mqttEndEx.reasonCode().get());
-    }
-
     @Test
     public void shouldEncodeMqttResetEx()
     {
         final byte[] array = MqttFunctions.resetEx()
             .typeId(0)
-            .serverReference("localhost:1883")
+            .serverRef("localhost:1883")
             .build();
 
         DirectBuffer buffer = new UnsafeBuffer(array);
         MqttResetExFW mqttResetEx = new MqttResetExFW().wrap(buffer, 0, buffer.capacity());
         assertEquals(0, mqttResetEx.typeId());
-        assertEquals("localhost:1883", mqttResetEx.serverReference().asString());
+        assertEquals("localhost:1883", mqttResetEx.serverRef().asString());
     }
 
     @Test
@@ -1292,4 +1206,64 @@ public void shouldEncodeMqttSessionState()
                     0 == f.qos() &&
                     0b0000 == f.flags()));
     }
+
+    @Test
+    public void shouldEncodeWillMessage()
+    {
+        final byte[] array = MqttFunctions.will()
+                .topic("will.client")
+                .delay(20)
+                .expiryInterval(15)
+                .contentType("message")
+                .format("TEXT")
+                .responseTopic("will.client.response")
+                .correlation("request-id-1")
+                .userProperty("name", "value")
+                .payload("client failed")
+            .build();
+
+        DirectBuffer buffer = new UnsafeBuffer(array);
+        MqttMessageFW willMessage = new MqttMessageFW().wrap(buffer, 0, buffer.capacity());
+
+        assertEquals("will.client", willMessage.topic().asString());
+        assertEquals(20, willMessage.delay());
+        assertEquals(15, willMessage.expiryInterval());
+        assertEquals("message", willMessage.contentType().asString());
+        assertEquals("TEXT", willMessage.format().toString());
+        assertEquals("will.client.response", willMessage.responseTopic().asString());
+        assertEquals("request-id-1", willMessage.correlation()
+            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
+        assertNotNull(willMessage.properties()
+            .matchFirst(h ->
+                "name".equals(h.key().asString()) &&
+                    "value".equals(h.value().asString())));
+        assertEquals("client failed", willMessage.payload()
+            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
+    }
+
+    @Test
+    public void shouldEncodeWillMessageBytesPayload()
+    {
+        final byte[] array = MqttFunctions.will()
+            .topic("will.client")
+            .qos("AT_LEAST_ONCE")
+            .flags("RETAIN")
+            .responseTopic("response_topic")
+            .correlationBytes("request-id-1".getBytes(UTF_8))
+            .payloadBytes(new byte[] {0, 1, 2, 3, 4, 5})
+            .build();
+
+        DirectBuffer buffer = new UnsafeBuffer(array);
+        MqttMessageFW willMessage = new MqttMessageFW().wrap(buffer, 0, buffer.capacity());
+
+        assertEquals("will.client", willMessage.topic().asString());
+        assertEquals(1, willMessage.flags());
+        assertEquals(0b0001, willMessage.flags());
+        assertEquals("BINARY", willMessage.format().toString());
+        assertEquals("response_topic", willMessage.responseTopic().asString());
+        assertEquals("request-id-1", willMessage.correlation()
+            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)));
+        assertArrayEquals(new byte[] {0, 1, 2, 3, 4, 5}, willMessage.payload()
+            .bytes().get((b, o, m) -> b.getStringWithoutLengthUtf8(o, m - o)).getBytes());
+    }
 }
diff --git a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/application/SessionIT.java b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/application/SessionIT.java
index 1a2e6ef51c..196930aaf6 100644
--- a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/application/SessionIT.java
+++ b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/application/SessionIT.java
@@ -57,18 +57,9 @@ public void shouldRemoveSessionAtCleanStart() throws Exception
 
     @Test
     @Specification({
-        "${app}/session.will.message.disconnect.with.will.message/client",
-        "${app}/session.will.message.disconnect.with.will.message/server"})
-    public void shouldSendReasonForEndAfterDisconnectWithWillMessage() throws Exception
-    {
-        k3po.finish();
-    }
-
-    @Test
-    @Specification({
-        "${app}/session.will.message.no.ping.within.keep.alive/client",
-        "${app}/session.will.message.no.ping.within.keep.alive/server"})
-    public void shouldSendReasonForEndAfterKeepAliveTimeout() throws Exception
+        "${app}/session.will.message.abort/client",
+        "${app}/session.will.message.abort/server"})
+    public void shouldAbortSessionStreamWhenWillDelivery() throws Exception
     {
         k3po.finish();
     }
diff --git a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/ConnectionIT.java b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/ConnectionIT.java
index 71c2b374a5..ff46963650 100644
--- a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/ConnectionIT.java
+++ b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/ConnectionIT.java
@@ -401,6 +401,15 @@ public void shouldNotReceivePublishPacketExceedingMaxPacketLimit() throws Except
         k3po.finish();
     }
 
+    @Test
+    @Specification({
+        "${net}/connect.reject.packet.too.large/client",
+        "${net}/connect.reject.packet.too.large/server"})
+    public void shouldRejectPacketTooLarge() throws Exception
+    {
+        k3po.finish();
+    }
+
     @Test
     @Specification({
         "${net}/connect.subscribe.unfragmented/client",
diff --git a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/PublishIT.java b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/PublishIT.java
index 010f0bcde3..8911a941c9 100644
--- a/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/PublishIT.java
+++ b/incubator/binding-mqtt.spec/src/test/java/io/aklivity/zilla/specs/binding/mqtt/streams/network/PublishIT.java
@@ -300,4 +300,13 @@ public void shouldPublishOneMessageThenSubscribeUnfragmented() throws Exception
     {
         k3po.finish();
     }
+
+    @Test
+    @Specification({
+        "${net}/publish.reject.packet.too.large/client",
+        "${net}/publish.reject.packet.too.large/server"})
+    public void shouldRejectPacketTooLarge() throws Exception
+    {
+        k3po.finish();
+    }
 }
diff --git a/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/MqttReasonCodes.java b/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/MqttReasonCodes.java
index 00fbf922a6..5ec4d0cf53 100644
--- a/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/MqttReasonCodes.java
+++ b/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/MqttReasonCodes.java
@@ -36,6 +36,7 @@ public final class MqttReasonCodes
     public static final byte UNSPECIFIED_ERROR = (byte) 0x80;
     public static final byte MALFORMED_PACKET = (byte) 0x81;
     public static final byte PROTOCOL_ERROR = (byte) 0x82;
+    public static final byte PACKET_TOO_LARGE = (byte) 0x95;
     public static final byte WILDCARD_SUBSCRIPTIONS_NOT_SUPPORTED = (byte) 0xa2;
     public static final byte SHARED_SUBSCRIPTION_NOT_SUPPORTED = (byte) 0x9e;
     public static final byte SUBSCRIPTION_IDS_NOT_SUPPORTED = (byte) 0xa1;
diff --git a/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/MqttServerFactory.java b/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/MqttServerFactory.java
index 4b4ead716e..5daa0866e1 100644
--- a/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/MqttServerFactory.java
+++ b/incubator/binding-mqtt/src/main/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/MqttServerFactory.java
@@ -23,6 +23,7 @@
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.MALFORMED_PACKET;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.NORMAL_DISCONNECT;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.NO_SUBSCRIPTION_EXISTED;
+import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.PACKET_TOO_LARGE;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.PAYLOAD_FORMAT_INVALID;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.PROTOCOL_ERROR;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttReasonCodes.QOS_NOT_SUPPORTED;
@@ -111,7 +112,6 @@
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.Flyweight;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttBinaryFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttCapabilities;
-import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttEndReasonCode;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttMessageFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttPayloadFormat;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.MqttQoS;
@@ -147,10 +147,10 @@
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.FlushFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttBeginExFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttDataExFW;
-import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttEndExFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttFlushExFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttPublishDataExFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttResetExFW;
+import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.MqttSessionDataKind;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.ResetFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.SignalFW;
 import io.aklivity.zilla.runtime.binding.mqtt.internal.types.stream.WindowFW;
@@ -242,7 +242,6 @@ public final class MqttServerFactory implements MqttStreamFactory
     private final MqttBeginExFW.Builder mqttPublishBeginExRW = new MqttBeginExFW.Builder();
     private final MqttBeginExFW.Builder mqttSubscribeBeginExRW = new MqttBeginExFW.Builder();
     private final MqttBeginExFW.Builder mqttSessionBeginExRW = new MqttBeginExFW.Builder();
-    private final MqttEndExFW.Builder mqttEndExRW = new MqttEndExFW.Builder();
     private final MqttDataExFW.Builder mqttPublishDataExRW = new MqttDataExFW.Builder();
     private final MqttDataExFW.Builder mqttSubscribeDataExRW = new MqttDataExFW.Builder();
     private final MqttDataExFW.Builder mqttSessionDataExRW = new MqttDataExFW.Builder();
@@ -304,6 +303,7 @@ public final class MqttServerFactory implements MqttStreamFactory
     private final MqttServerDecoder decodeInitialType = this::decodeInitialType;
     private final MqttServerDecoder decodePacketType = this::decodePacketType;
     private final MqttServerDecoder decodeConnect = this::decodeConnect;
+    private final MqttServerDecoder decodeConnectPayload = this::decodeConnectPayload;
     private final MqttServerDecoder decodePublish = this::decodePublish;
     private final MqttServerDecoder decodeSubscribe = this::decodeSubscribe;
     private final MqttServerDecoder decodeUnsubscribe = this::decodeUnsubscribe;
@@ -314,7 +314,8 @@ public final class MqttServerFactory implements MqttStreamFactory
 
     private final Map<MqttPacketType, MqttServerDecoder> decodersByPacketType;
     private final boolean session;
-    private final String serverReference;
+    private final String serverRef;
+    private int maximumPacketSize;
 
     {
         final Map<MqttPacketType, MqttServerDecoder> decodersByPacketType = new EnumMap<>(MqttPacketType.class);
@@ -415,6 +416,7 @@ public MqttServerFactory(
         this.keepAliveMinimum = config.keepAliveMinimum();
         this.keepAliveMaximum = config.keepAliveMaximum();
         this.maximumQos = config.maximumQos();
+        this.maximumPacketSize = writeBuffer.capacity();
         this.retainedMessages = config.retainAvailable() ? (byte) 1 : 0;
         this.wildcardSubscriptions = config.wildcardSubscriptionAvailable() ? (byte) 1 : 0;
         this.subscriptionIdentifiers = config.subscriptionIdentifierAvailable() ? (byte) 1 : 0;
@@ -429,7 +431,7 @@ public MqttServerFactory(
 
         final Optional<String16FW> clientId = Optional.ofNullable(config.clientId()).map(String16FW::new);
         this.supplyClientId = clientId.isPresent() ? clientId::get : () -> new String16FW(UUID.randomUUID().toString());
-        this.serverReference = config.serverReference();
+        this.serverRef = config.serverReference();
     }
 
     @Override
@@ -762,11 +764,8 @@ private int decodeInitialType(
                 break decode;
             }
 
-            if (limit - packet.limit() >= length)
-            {
-                server.decodeablePacketBytes = packet.sizeof() + length;
-                server.decoder = decodePacketType;
-            }
+            server.decodeablePacketBytes = packet.sizeof() + length;
+            server.decoder = decodePacketType;
         }
 
         return offset;
@@ -789,7 +788,12 @@ private int decodePacketType(
             final MqttPacketType packetType = MqttPacketType.valueOf(packet.typeAndFlags() >> 4);
             final MqttServerDecoder decoder = decodersByPacketType.getOrDefault(packetType, decodeUnknownType);
 
-            if (limit - packet.limit() >= length)
+            if (packet.sizeof() + length > maximumPacketSize)
+            {
+                server.onDecodeError(traceId, authorization, PACKET_TOO_LARGE);
+                server.decoder = decodeIgnoreAll;
+            }
+            else if (limit - packet.limit() >= length)
             {
                 server.decodeablePacketBytes = packet.sizeof() + length;
                 server.decoder = decoder;
@@ -817,6 +821,7 @@ private int decodeConnect(
             int reasonCode = SUCCESS;
 
             final MqttConnectFW mqttConnect = mqttConnectRO.tryWrap(buffer, offset, limit);
+            int flags = 0;
             decode:
             {
                 if (mqttConnect == null)
@@ -825,7 +830,8 @@ private int decodeConnect(
                     break decode;
                 }
 
-                int flags = mqttConnect.flags();
+                server.decodableRemainingBytes = mqttConnect.remainingLength();
+                flags = mqttConnect.flags();
 
                 reasonCode = decodeConnectType(mqttConnect, flags);
                 if (reasonCode != SUCCESS)
@@ -846,6 +852,9 @@ private int decodeConnect(
                 }
 
                 progress = server.onDecodeConnect(traceId, authorization, buffer, progress, limit, mqttConnect);
+
+                final int decodedLength = progress - offset - 2;
+                server.decodableRemainingBytes -= decodedLength;
             }
 
             if (reasonCode != SUCCESS)
@@ -853,6 +862,31 @@ private int decodeConnect(
                 server.onDecodeError(traceId, authorization, reasonCode);
                 server.decoder = decodeIgnoreAll;
             }
+            else
+            {
+                server.decoder = decodeConnectPayload;
+            }
+        }
+
+        return progress;
+    }
+
+    private int decodeConnectPayload(
+        MqttServer server,
+        final long traceId,
+        final long authorization,
+        final long budgetId,
+        final DirectBuffer buffer,
+        final int offset,
+        final int limit)
+    {
+        int progress = offset;
+
+        progress = server.onDecodeConnectPayload(traceId, authorization, buffer, progress, limit);
+        server.decodableRemainingBytes -= progress - offset;
+        if (server.decodableRemainingBytes == 0)
+        {
+            server.decoder = decodePacketType;
         }
 
         return progress;
@@ -1219,19 +1253,19 @@ private final class MqttServer
         private long keepAliveTimeoutAt;
 
         private boolean serverDefinedKeepAlive = false;
-        private boolean cleanStart = false;
         private short keepAlive;
         private long keepAliveTimeout;
+        private int connectFlags;
         private boolean connected;
 
         private short topicAliasMaximum = 0;
-        private int maximumPacketSize = Integer.MAX_VALUE;
         private int sessionExpiryInterval = 0;
         private boolean assignedClientId = false;
         private int propertyMask = 0;
 
         private int state;
         private long sessionId;
+        private int decodableRemainingBytes;
 
         private MqttServer(
             Function<String, String> credentials,
@@ -1484,10 +1518,7 @@ private void onKeepAliveTimeoutSignal(
             {
                 if (session)
                 {
-                    final MqttEndExFW.Builder builder = mqttEndExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
-                        .typeId(mqttTypeId)
-                        .reasonCode(r -> r.set(MqttEndReasonCode.KEEP_ALIVE_EXPIRY));
-                    sessionStream.doSessionAppEnd(traceId, builder.build());
+                    sessionStream.doSessionAbort(traceId);
                 }
                 onDecodeError(traceId, authorization, KEEP_ALIVE_TIMEOUT);
                 decoder = decodeIgnoreAll;
@@ -1563,14 +1594,15 @@ private byte decodeConnectProperties(
                     break;
                 case KIND_RECEIVE_MAXIMUM:
                 case KIND_MAXIMUM_PACKET_SIZE:
-                    final int maximumPacketSize = (int) mqttProperty.maximumPacketSize();
-                    if (maximumPacketSize == 0 || isSetMaximumPacketSize(propertyMask))
+                    final int maxConnectPacketSize = (int) mqttProperty.maximumPacketSize();
+                    if (maxConnectPacketSize == 0 || isSetMaximumPacketSize(propertyMask))
                     {
                         reasonCode = PROTOCOL_ERROR;
                         break decode;
                     }
                     this.propertyMask |= CONNECT_TOPIC_ALIAS_MAXIMUM_MASK;
-                    this.maximumPacketSize = maximumPacketSize;
+                    //TODO: remove this once we will support large messages
+                    maximumPacketSize = Math.min(maxConnectPacketSize, maximumPacketSize);
                     break;
                 case KIND_REQUEST_RESPONSE_INFORMATION:
                 case KIND_REQUEST_PROBLEM_INFORMATION:
@@ -1639,23 +1671,54 @@ else if (length > MAXIMUM_CLIENT_ID_LENGTH)
                     break decode;
                 }
 
+                final MqttBindingConfig binding = bindings.get(routedId);
+
+                final MqttRouteConfig resolved = binding != null ? binding.resolve(authorization) : null;
+
+                keepAlive = (short) Math.min(Math.max(connect.keepAlive(), keepAliveMinimum), keepAliveMaximum);
+                serverDefinedKeepAlive = keepAlive != connect.keepAlive();
+                keepAliveTimeout = Math.round(TimeUnit.SECONDS.toMillis(keepAlive) * 1.5);
+                connectFlags = connect.flags();
+                doSignalKeepAliveTimeout();
+
+                if (session)
+                {
+                    resolveSession(traceId, authorization, resolved.id, connectFlags);
+                }
+
+                doCancelConnectTimeout();
+            }
+
+            progress = connect.limit();
+            if (reasonCode != SUCCESS)
+            {
+                doCancelConnectTimeout();
+                doEncodeConnack(traceId, authorization, reasonCode, assignedClientId, false, null);
+                doNetworkEnd(traceId, authorization);
+                decoder = decodeIgnoreAll;
+            }
+
+            return progress;
+        }
+
+        private int onDecodeConnectPayload(
+            long traceId,
+            long authorization,
+            DirectBuffer buffer,
+            int progress,
+            int limit)
+        {
+            byte reasonCode;
+            decode:
+            {
                 final MqttConnectPayload payload = mqttConnectPayloadRO.reset();
-                progress = connect.limit();
-                progress = payload.decode(buffer, progress, limit, connect.flags());
+                int connectPayloadLimit = payload.decode(buffer, progress, limit, connectFlags);
                 reasonCode = payload.reasonCode;
 
                 if (reasonCode != SUCCESS)
                 {
                     break decode;
                 }
-                if (isCleanStart(connect.flags()))
-                {
-                    this.cleanStart = true;
-                }
-                keepAlive = (short) Math.min(Math.max(connect.keepAlive(), keepAliveMinimum), keepAliveMaximum);
-                serverDefinedKeepAlive = keepAlive != connect.keepAlive();
-                keepAliveTimeout = Math.round(TimeUnit.SECONDS.toMillis(keepAlive) * 1.5);
-                doSignalKeepAliveTimeout();
 
                 long sessionAuth = authorization;
                 if (guard != null)
@@ -1690,36 +1753,75 @@ else if (this.authField.equals(MqttConnectProperty.PASSWORD))
                 }
 
                 this.sessionId = sessionAuth;
-                if (session)
-                {
-                    resolveSession(traceId, sessionAuth, resolved.id, connect, payload);
-                }
-                else
+
+                if (!session)
                 {
-                    doEncodeConnack(traceId, authorization, reasonCode, assignedClientId, false, null);
+                    doEncodeConnack(traceId, authorization, reasonCode, assignedClientId,
+                        false, null);
                     connected = true;
                 }
 
-                doCancelConnectTimeout();
+                final int flags = connectFlags;
+                final boolean willFlagSet = isSetWillFlag(flags);
+                final int willFlags = decodeWillFlags(flags);
+                final int willQos = decodeWillQos(flags);
 
-                decoder = decodePacketType;
-            }
+                if (session && willFlagSet)
+                {
+                    final MqttDataExFW.Builder sessionDataExBuilder =
+                        mqttSessionDataExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
+                            .typeId(mqttTypeId)
+                            .session(s -> s.kind(k -> k.set(MqttSessionDataKind.WILL)));
 
-            if (reasonCode == BAD_USER_NAME_OR_PASSWORD)
-            {
-                doCancelConnectTimeout();
-                doNetworkEnd(traceId, authorization);
-                decoder = decodeIgnoreAll;
-                progress = connect.limit();
+                    final MqttMessageFW.Builder willMessageBuilder =
+                        mqttMessageFW.wrap(willMessageBuffer, 0, willMessageBuffer.capacity())
+                            .topic(payload.willTopic)
+                            .delay(payload.willDelay)
+                            .qos(willQos)
+                            .flags(willFlags)
+                            .expiryInterval(payload.expiryInterval)
+                            .contentType(payload.contentType)
+                            .format(f -> f.set(payload.payloadFormat))
+                            .responseTopic(payload.responseTopic)
+                            .correlation(c -> c.bytes(payload.correlationData));
+
+                    final Array32FW<MqttUserPropertyFW> userProperties = willUserPropertiesRW.build();
+                    userProperties.forEach(
+                        c -> willMessageBuilder.propertiesItem(p -> p.key(c.key()).value(c.value())));
+                    willMessageBuilder.payload(p -> p.bytes(payload.willPayload.bytes()));
+
+                    final MqttMessageFW will = willMessageBuilder.build();
+                    final int willPayloadSize = willMessageBuilder.sizeof();
+
+                    if (!sessionStream.hasSessionWindow(willPayloadSize))
+                    {
+                        break decode;
+                    }
+                    sessionStream.doSessionData(traceId, willPayloadSize, sessionDataExBuilder.build(), will);
+                }
+                progress = connectPayloadLimit;
             }
-            else if (reasonCode != SUCCESS)
+
+            if (reasonCode != SUCCESS)
             {
                 doCancelConnectTimeout();
-                doEncodeConnack(traceId, authorization, reasonCode, assignedClientId, false, null);
+
+                if (reasonCode != BAD_USER_NAME_OR_PASSWORD)
+                {
+                    doEncodeConnack(traceId, authorization, reasonCode, assignedClientId, false, null);
+                }
+
+                if (session)
+                {
+                    sessionStream.doSessionAppEnd(traceId, EMPTY_OCTETS);
+                }
                 doNetworkEnd(traceId, authorization);
+
                 decoder = decodeIgnoreAll;
-                progress = connect.limit();
+                progress = limit;
             }
+
+
             return progress;
         }
 
@@ -1727,43 +1829,16 @@ private void resolveSession(
             long traceId,
             long authorization,
             long resolvedId,
-            MqttConnectFW connect,
-            MqttConnectPayload payload)
+            int flags)
         {
-            final int flags = connect.flags();
-
-            final boolean willFlagSet = isSetWillFlag(flags);
-
             final MqttBeginExFW.Builder builder = mqttSessionBeginExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
                 .typeId(mqttTypeId)
-                .session(sessionBuilder ->
-                {
-                    sessionBuilder.clientId(clientId);
-                    sessionBuilder.expiry(sessionExpiryInterval);
-                    sessionBuilder.serverReference(serverReference);
-                    if (willFlagSet)
-                    {
-                        final int willFlags = decodeWillFlags(flags);
-                        final int willQos = decodeWillQos(flags);
-                        final MqttMessageFW.Builder willMessageBuilder =
-                            mqttMessageFW.wrap(willMessageBuffer, 0, willMessageBuffer.capacity())
-                            .topic(payload.willTopic)
-                            .delay(payload.willDelay)
-                            .qos(willQos)
-                            .flags(willFlags)
-                            .expiryInterval(payload.expiryInterval)
-                            .contentType(payload.contentType)
-                            .format(f -> f.set(payload.payloadFormat))
-                            .responseTopic(payload.responseTopic)
-                            .correlation(c -> c.bytes(payload.correlationData));
-
-                        final Array32FW<MqttUserPropertyFW> userProperties = willUserPropertiesRW.build();
-                        userProperties.forEach(
-                            c -> willMessageBuilder.propertiesItem(p -> p.key(c.key()).value(c.value())));
-                        willMessageBuilder.payload(p -> p.bytes(payload.willPayload.bytes()));
-                        sessionBuilder.will(willMessageBuilder.build());
-                    }
-                });
+                .session(sessionBuilder -> sessionBuilder
+                    .flags(flags)
+                    .expiry(sessionExpiryInterval)
+                    .clientId(clientId)
+                    .serverRef(serverRef)
+                );
 
             if (sessionStream == null)
             {
@@ -1945,6 +2020,11 @@ private void onDecodeSubscribe(
 
                 if (session)
                 {
+                    final MqttDataExFW.Builder sessionDataExBuilder =
+                        mqttSessionDataExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
+                            .typeId(mqttTypeId)
+                            .session(sessionBuilder -> sessionBuilder.kind(k -> k.set(MqttSessionDataKind.STATE)));
+
                     final MqttSessionStateFW.Builder state =
                         mqttSessionStateFW.wrap(sessionStateBuffer, 0, sessionStateBuffer.capacity());
 
@@ -1968,7 +2048,7 @@ private void onDecodeSubscribe(
                     final MqttSessionStateFW sessionState = state.build();
                     final int payloadSize = sessionState.sizeof();
 
-                    sessionStream.doSessionData(traceId, payloadSize, sessionState);
+                    sessionStream.doSessionData(traceId, payloadSize, sessionDataExBuilder.build(), sessionState);
                 }
                 else
                 {
@@ -2078,6 +2158,11 @@ private void doSendSessionState(
             long traceId,
             List<String> topicFilters)
         {
+            final MqttDataExFW.Builder sessionDataExBuilder =
+                mqttSessionDataExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
+                    .typeId(mqttTypeId)
+                    .session(sessionBuilder -> sessionBuilder.kind(k -> k.set(MqttSessionDataKind.STATE)));
+
             List<Subscription> currentState = sessionStream.subscriptions();
             List<Subscription> newState = currentState.stream()
                 .filter(subscription -> !topicFilters.contains(subscription.filter))
@@ -2098,7 +2183,7 @@ private void doSendSessionState(
             final MqttSessionStateFW sessionState = sessionStateBuilder.build();
             final int payloadSize = sessionState.sizeof();
 
-            sessionStream.doSessionData(traceId, payloadSize, sessionState);
+            sessionStream.doSessionData(traceId, payloadSize, sessionDataExBuilder.build(), sessionState);
         }
 
         private void sendUnsuback(
@@ -2162,13 +2247,14 @@ private void onDecodeDisconnect(
             state = MqttState.closingInitial(state);
             if (session)
             {
-                final MqttEndExFW.Builder builder = mqttEndExRW.wrap(sessionExtBuffer, 0, sessionExtBuffer.capacity())
-                    .typeId(mqttTypeId)
-                    .reasonCode(r -> r.set(
-                        disconnect.reasonCode() == DISCONNECT_WITH_WILL_MESSAGE ?
-                            MqttEndReasonCode.DISCONNECT_WITH_WILL :
-                            MqttEndReasonCode.DISCONNECT));
-                sessionStream.doSessionAppEnd(traceId, builder.build());
+                if (disconnect.reasonCode() == DISCONNECT_WITH_WILL_MESSAGE)
+                {
+                    sessionStream.doSessionAbort(traceId);
+                }
+                else
+                {
+                    sessionStream.doSessionAppEnd(traceId, EMPTY_OCTETS);
+                }
             }
             closeStreams(traceId, authorization);
             doNetworkEnd(traceId, authorization);
@@ -2464,6 +2550,12 @@ private void doEncodeConnack(
             MqttPropertyFW mqttProperty;
             if (reasonCode == SUCCESS)
             {
+                //TODO: remove this once we support large messages
+                mqttProperty = mqttPropertyRW.wrap(propertyBuffer, propertiesSize, propertyBuffer.capacity())
+                    .maximumPacketSize(maximumPacketSize)
+                    .build();
+                propertiesSize = mqttProperty.limit();
+
                 if (sessionExpiryInterval > sessionExpiryIntervalLimit)
                 {
                     mqttProperty = mqttPropertyRW.wrap(propertyBuffer, propertiesSize, propertyBuffer.capacity())
@@ -3020,6 +3112,7 @@ private void onSessionWindow(
                 final long authorization = window.authorization();
                 final long budgetId = window.budgetId();
                 final int padding = window.padding();
+                final boolean wasOpen = MqttState.initialOpened(state);
 
                 if (!MqttState.initialOpened(state))
                 {
@@ -3040,6 +3133,11 @@ private void onSessionWindow(
 
                 assert initialAck <= initialSeq;
 
+                if (!wasOpen)
+                {
+                    decodeNetwork(traceId);
+                }
+
                 if (budgetId != 0L && debitorIndex == NO_DEBITOR_INDEX)
                 {
                     debitor = supplyDebitor.apply(budgetId);
@@ -3065,20 +3163,20 @@ private void onSessionReset(
 
                 if (mqttResetEx != null)
                 {
-                    String16FW serverReference = mqttResetEx.serverReference();
-                    boolean serverReferenceExists = serverReference != null;
+                    String16FW serverRef = mqttResetEx.serverRef();
+                    boolean serverRefExists = serverRef != null;
 
-                    byte reasonCode = serverReferenceExists ? SERVER_MOVED : SESSION_TAKEN_OVER;
+                    byte reasonCode = serverRefExists ? SERVER_MOVED : SESSION_TAKEN_OVER;
 
                     if (!connected)
                     {
                         doCancelConnectTimeout();
                         doEncodeConnack(traceId, authorization, reasonCode, assignedClientId,
-                            false, serverReference);
+                            false, serverRef);
                     }
                     else
                     {
-                        doEncodeDisconnect(traceId, authorization, reasonCode, serverReferenceExists ? serverReference : null);
+                        doEncodeDisconnect(traceId, authorization, reasonCode, serverRefExists ? serverRef : null);
                     }
                 }
                 setInitialClosed();
@@ -3150,9 +3248,9 @@ private void onSessionData(
                         boolean sessionPresent = false;
                         if (sessionState != null)
                         {
-                            if (cleanStart)
+                            if (isCleanStart(connectFlags))
                             {
-                                doSessionData(traceId, 0, emptyRO);
+                                doSessionData(traceId, 0, emptyRO, emptyRO);
                             }
                             else
                             {
@@ -3274,16 +3372,23 @@ private void doSessionBegin(
                 }
             }
 
+            private boolean hasSessionWindow(
+                int length)
+            {
+                return initialMax - (initialSeq - initialAck) >= length + initialPad;
+            }
+
             private void doSessionData(
                 long traceId,
                 int reserved,
-                Flyweight sessionState)
+                Flyweight dataEx,
+                Flyweight payload)
             {
                 assert MqttState.initialOpening(state);
 
-                final DirectBuffer buffer = sessionState.buffer();
-                final int offset = sessionState.offset();
-                final int limit = sessionState.limit();
+                final DirectBuffer buffer = payload.buffer();
+                final int offset = payload.offset();
+                final int limit = payload.limit();
                 final int length = limit - offset;
                 assert reserved >= length + initialPad;
 
@@ -3292,7 +3397,7 @@ private void doSessionData(
                 if (!MqttState.closed(state))
                 {
                     doData(application, originId, routedId, initialId, initialSeq, initialAck, initialMax,
-                        traceId, sessionId, budgetId, reserved, buffer, offset, length, EMPTY_OCTETS);
+                        traceId, sessionId, budgetId, reserved, buffer, offset, length, dataEx);
 
                     initialSeq += reserved;
                     assert initialSeq <= initialAck + initialMax;
diff --git a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/ConnectionIT.java b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/ConnectionIT.java
index dedc52e7bd..95fd384785 100644
--- a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/ConnectionIT.java
+++ b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/ConnectionIT.java
@@ -25,6 +25,7 @@
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttConfigurationTest.SHARED_SUBSCRIPTION_AVAILABLE_NAME;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttConfigurationTest.WILDCARD_SUBSCRIPTION_AVAILABLE_NAME;
 import static io.aklivity.zilla.runtime.engine.EngineConfiguration.ENGINE_DRAIN_ON_CLOSE;
+import static io.aklivity.zilla.runtime.engine.test.EngineRule.ENGINE_BUFFER_SLOT_CAPACITY_NAME;
 import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.junit.rules.RuleChain.outerRule;
 
@@ -624,4 +625,19 @@ public void shouldConnectAndSubscribeUnfragmented() throws Exception
     {
         k3po.finish();
     }
+
+    @Test
+    @Configuration("server.yaml")
+    @Specification({
+        "${net}/connect.reject.packet.too.large/client"})
+    @Configure(name = SESSION_AVAILABLE_NAME, value = "false")
+    @Configure(name = WILDCARD_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = SHARED_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = MAXIMUM_QOS_NAME, value = "2")
+    @Configure(name = SESSION_EXPIRY_INTERVAL_NAME, value = "0")
+    @Configure(name = ENGINE_BUFFER_SLOT_CAPACITY_NAME, value = "8192")
+    public void shouldRejectPacketTooLarge() throws Exception
+    {
+        k3po.finish();
+    }
 }
diff --git a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/PublishIT.java b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/PublishIT.java
index 389414a5eb..078a49afc9 100644
--- a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/PublishIT.java
+++ b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/PublishIT.java
@@ -25,6 +25,7 @@
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttConfigurationTest.TOPIC_ALIAS_MAXIMUM_NAME;
 import static io.aklivity.zilla.runtime.binding.mqtt.internal.MqttConfigurationTest.WILDCARD_SUBSCRIPTION_AVAILABLE_NAME;
 import static io.aklivity.zilla.runtime.engine.EngineConfiguration.ENGINE_DRAIN_ON_CLOSE;
+import static io.aklivity.zilla.runtime.engine.test.EngineRule.ENGINE_BUFFER_SLOT_CAPACITY_NAME;
 import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.junit.rules.RuleChain.outerRule;
 
@@ -478,4 +479,19 @@ public void shouldPublishEmptyMessage() throws Exception
     {
         k3po.finish();
     }
+
+    @Test
+    @Configuration("server.yaml")
+    @Specification({
+        "${net}/publish.reject.packet.too.large/client"})
+    @Configure(name = SESSION_AVAILABLE_NAME, value = "false")
+    @Configure(name = WILDCARD_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = SHARED_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = MAXIMUM_QOS_NAME, value = "2")
+    @Configure(name = SESSION_EXPIRY_INTERVAL_NAME, value = "0")
+    @Configure(name = ENGINE_BUFFER_SLOT_CAPACITY_NAME, value = "8192")
+    public void shouldRejectPacketTooLarge() throws Exception
+    {
+        k3po.finish();
+    }
 }
diff --git a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/SessionIT.java b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/SessionIT.java
index 489b9c62ae..9937e3a2b1 100644
--- a/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/SessionIT.java
+++ b/incubator/binding-mqtt/src/test/java/io/aklivity/zilla/runtime/binding/mqtt/internal/stream/SessionIT.java
@@ -172,6 +172,21 @@ public void shouldStoreWillMessageInSessionState() throws Exception
         k3po.finish();
     }
 
+    @Test
+    @Configuration("server.yaml")
+    @Specification({
+        "${net}/session.connect.payload.fragmented/client",
+        "${app}/session.will.message.retain/server"})
+    @Configure(name = WILDCARD_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = SHARED_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
+    @Configure(name = MAXIMUM_QOS_NAME, value = "2")
+    @Configure(name = SESSION_EXPIRY_INTERVAL_NAME, value = "10")
+    public void shouldStoreWillMessageInSessionStatePayloadFragmented() throws Exception
+    {
+        k3po.finish();
+    }
+
+
     @Test
     @Configuration("server.yaml")
     @Specification({
@@ -190,7 +205,7 @@ public void shouldCloseSessionNormalDisconnect() throws Exception
     @Configuration("server.yaml")
     @Specification({
         "${net}/session.will.message.disconnect.with.will.message/client",
-        "${app}/session.will.message.disconnect.with.will.message/server"})
+        "${app}/session.will.message.abort/server"})
     @Configure(name = WILDCARD_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
     @Configure(name = SHARED_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
     @Configure(name = MAXIMUM_QOS_NAME, value = "2")
@@ -204,7 +219,7 @@ public void shouldCloseSessionDisconnectWithWill() throws Exception
     @Configuration("server.yaml")
     @Specification({
         "${net}/session.will.message.no.ping.within.keep.alive/client",
-        "${app}/session.will.message.no.ping.within.keep.alive/server"})
+        "${app}/session.will.message.abort/server"})
     @Configure(name = WILDCARD_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
     @Configure(name = SHARED_SUBSCRIPTION_AVAILABLE_NAME, value = "true")
     @Configure(name = MAXIMUM_QOS_NAME, value = "2")
diff --git a/incubator/command-log/src/main/java/io/aklivity/zilla/runtime/command/log/internal/LoggableStream.java b/incubator/command-log/src/main/java/io/aklivity/zilla/runtime/command/log/internal/LoggableStream.java
index 66636d3340..52a15e91ec 100644
--- a/incubator/command-log/src/main/java/io/aklivity/zilla/runtime/command/log/internal/LoggableStream.java
+++ b/incubator/command-log/src/main/java/io/aklivity/zilla/runtime/command/log/internal/LoggableStream.java
@@ -45,8 +45,6 @@
 import io.aklivity.zilla.runtime.command.log.internal.types.KafkaPartitionFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.KafkaSkipFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.KafkaValueMatchFW;
-import io.aklivity.zilla.runtime.command.log.internal.types.MqttEndReasonCode;
-import io.aklivity.zilla.runtime.command.log.internal.types.MqttMessageFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.MqttPayloadFormat;
 import io.aklivity.zilla.runtime.command.log.internal.types.MqttTopicFilterFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.MqttUserPropertyFW;
@@ -99,7 +97,6 @@
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.KafkaResetExFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttBeginExFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttDataExFW;
-import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttEndExFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttFlushExFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttPublishBeginExFW;
 import io.aklivity.zilla.runtime.command.log.internal.types.stream.MqttPublishDataExFW;
@@ -145,7 +142,6 @@ public final class LoggableStream implements AutoCloseable
     private final MqttBeginExFW mqttBeginExRO = new MqttBeginExFW();
     private final MqttDataExFW mqttDataExRO = new MqttDataExFW();
     private final MqttFlushExFW mqttFlushExRO = new MqttFlushExFW();
-    private final MqttEndExFW mqttEndExRO = new MqttEndExFW();
     private final AmqpBeginExFW amqpBeginExRO = new AmqpBeginExFW();
     private final AmqpDataExFW amqpDataExRO = new AmqpDataExFW();
 
@@ -269,7 +265,6 @@ public final class LoggableStream implements AutoCloseable
             beginHandlers.put(labels.lookupLabelId("mqtt"), this::onMqttBeginEx);
             dataHandlers.put(labels.lookupLabelId("mqtt"), this::onMqttDataEx);
             flushHandlers.put(labels.lookupLabelId("mqtt"), this::onMqttFlushEx);
-            endHandlers.put(labels.lookupLabelId("mqtt"), this::onMqttEndEx);
         }
 
         if (hasExtensionType.test("amqp"))
@@ -1310,34 +1305,10 @@ private void onMqttSessionBeginEx(
     {
         final String clientId = session.clientId().asString();
         final int expiry = session.expiry();
-        final MqttMessageFW will = session.will();
+        final String serverRef = session.serverRef().asString();
 
         out.printf(verboseFormat, index, offset, timestamp,
-            format("[session] %s %d", clientId, expiry));
-        if (will != null)
-        {
-            final String willTopic = will.topic().asString();
-            final int delay = will.delay();
-            final int flags = will.flags();
-            final int expiryInterval = will.expiryInterval();
-            final String contentType = will.contentType().asString();
-            final MqttPayloadFormat format = will.format().get();
-            final String responseTopic = will.responseTopic().asString();
-            final String correlation = asString(will.correlation().bytes());
-            final Array32FW<MqttUserPropertyFW> userProperties = will.properties();
-            final String payload = asString(will.payload().bytes());
-            out.printf(verboseFormat, index, offset, timestamp, format("will topic: %s", willTopic));
-            out.printf(verboseFormat, index, offset, timestamp, format("will delay: %d", delay));
-            out.printf(verboseFormat, index, offset, timestamp, format("will flags: %d", flags));
-            out.printf(verboseFormat, index, offset, timestamp, format("will expiry: %d", expiryInterval));
-            out.printf(verboseFormat, index, offset, timestamp, format("will content type: %s", contentType));
-            out.printf(verboseFormat, index, offset, timestamp, format("will format: %s", format.name()));
-            out.printf(verboseFormat, index, offset, timestamp, format("will response topic: %s", responseTopic));
-            out.printf(verboseFormat, index, offset, timestamp, format("will correlation: %s", correlation));
-            out.printf(verboseFormat, index, offset, timestamp, format("will payload: %s", payload));
-            userProperties.forEach(u -> out.printf(verboseFormat, index, offset, timestamp,
-                format("will user property: %s %s ", u.key(), u.value())));
-        }
+            format("[session] %s %d %s", clientId, expiry, serverRef));
     }
 
     private void onMqttDataEx(
@@ -1420,18 +1391,6 @@ private void onMqttFlushEx(
             format("%s %d %d", f.pattern(), f.subscriptionId(), f.flags())));
     }
 
-    private void onMqttEndEx(
-        final EndFW end)
-    {
-        final int offset = end.offset() - HEADER_LENGTH;
-        final long timestamp = end.timestamp();
-        final OctetsFW extension = end.extension();
-
-        final MqttEndExFW mqttEndEx = mqttEndExRO.wrap(extension.buffer(), extension.offset(), extension.limit());
-        final MqttEndReasonCode reasonCode = mqttEndEx.reasonCode().get();
-        out.printf(verboseFormat, index, offset, timestamp, format("%s", reasonCode.name()));
-    }
-
     private void onAmqpBeginEx(
         final BeginFW begin)
     {