MQTT client not receiving events in asyncapi.mqtt.proxy Example

[ankitk-me]

Describe the bug
When running the asyncapi.mqtt.proxy example, triggering subscribe request is not fetching events

To Reproduce
Steps to reproduce the behavior:

1. Go to asyncapi.mqtt.proxy
2. Start the example using ./setup.sh
3. Trigger mentioned request:

mosquitto_sub -V '5' -t 'smartylighting/streetlights/1/0/event/+/lighting/measured' -d

4. Publish a record:

mosquitto_pub -V '5' -t 'smartylighting/streetlights/1/0/event/1/lighting/measured' -m '{"id":"1","status":"on"}' -d -p 7183

5. No events arrive on the first client.
6. Trigger publish command few times and it hangs, followed by:

$ mosquitto_pub -V '5' -t 'smartylighting/streetlights/1/0/event/1/lighting/measured' -m '{"id":"1","status":"on"}' -d -p 7183
Client null sending CONNECT
Error: Keepalive exceeded

Expected behavior
mqtt client should be able to publish & subscribe events to topics.