Help me find an AC controller

Im trying to find a ac controller that is smart and that i can integrate, but im striking out.

today i have a 24v honeywell controller with fat cables. and i can not find anything that can replace it?
can someone please point me in the right direction or have found something that works?
below is a picture, i know its dirty like hell…

looks like modbus/RS486, maybe midea branded,
?

Sorry for a very late reply, life kinda got crazy!
the thermostat i have today is not smart at all i just need to replace it with something new. and i can not find anything that can be integrated with HA that is 24v and supports thick cables…

the controller today is a Honeywell TH5110D1022-U