Publish a copy under homex_emqtt or something if you need to 
not ideal but 
I have Home Assistant set up now. Set up a local Homex project on my computer and that gets:
[error] Failed to connect to MQTT broker: {:unauthorized_client, :undefined}
Mosquito reports this:
2025-11-19 11:52:48: Client emqtt-monolith-cb2418cf5a571895f61a disconnected, not authorised.
2025-11-19 11:52:53: New connection from 192.168.2.174:49228 on port 1883.
Sure I’ve missed something in config on one side or the other 
)