Dead KC868-H32B ?

[bigramon]

i think you can use a mqtt debug tool, always send "query" command to MQTT server borker, then save the log, then you can check whether have no feedback.

I always use Mqtt Explorer to confirm commands and status and properly managed.
When the kc868-h32b stops answering commands and reporting its state, I can see Home Assistant sending the commands to the Mosquitto Broker without any confirmation from the kincony device.
I can still manually change the status of the relays by sending http commands with curl but that also does not trigger any MQTT updates to the broker.