I am interested in trying Zilla as an MQTT broker that connects to Kafka, but I cannot manage to get the example in the documentation working. This seems to be the only documentation available related to MQTT, so I don't know what to do now. I hope someone can help me get the example working so I can proceed to integrate Zilla in my project.

What I did:

1. Download the example from here.
2. Run the example with docker compose --profile kafka --profile init-kafka up -d.
3. Verify that Kafka is running correctly and check on kafka-ui that the topics are created.
4. Try to connect to Zilla using the Mosquitto client, but receive error.

The Zilla container does not log anything usefull, I only see the zilla.yml content and then 'started'.

This is the output I get when I try to subscribe to a topic:

$ mosquitto_sub --url mqtt://127.0.0.1:7183/zilla
Connection error: Connection Refused: unknown reason.

This is the output I get when I try to publish a message on a topic:

$ mosquitto_pub --url mqtt://127.0.0.1:7183/zilla --message 'Hello, world'
Connection error: Connection Refused: unknown reason.
Error: A network protocol error occurred when communicating with the broker.

Tried on Windows 11 with Docker Desktop and on Debian 12.