Domoticz

For using a matter thermostat, I installed home assistant on my second pi. I searched the internet but I don't find, how to interface the values of the real home assistant thermostat to my domoticz dummy thermostat (state, temperature, wanted temperature and humidity). I found, that mqtt is the right way, but in home assistant this is very difficiult to handle, because you have several possibilities to do. Has anyone a example and description, what I have to do in both systems? Perhaps I could define the thermostat in home assistant, that is is automatically found by domoticz mqtt auto discovery? Thanks a lot.