MQTT Client stops working, all devices suddenly disconnected

Hi,

I recently tried home assistant and it work great. But I am having troubles with the MQTT integration. I am using the standard MQTT client and everything looks good: I have several devices discovered automatically and I can read and toggle their state. But after a couple of days, all devices are suddenly disconnected.

My current setup is as follows:

  • zigbee2mqtt server running on a raspberry pi
  • mqtt broker (mosquitto 1.3.5 - pretty old, but does work for a couple of years now) on a windows VM
  • home assistant (2023.6.0) running as esxi virtual machine via the provided vmdk
  • another pretty old automation framework (eventghost) on the same VM as mosquitto. While home assistant lost all devices I can still control all devices using event ghost and (of course) the zigbee2mqtt dashboard

Does anyone have the same problems? Where do I find MQTT client related log file which could help to analyze the problem further?

thx, br klemensl