I hooked my CX34 and CXI up to Home Assistant. It uses the native MQTT discovery and connects to the devices over modbus. I have no idea if anyone else wants such a thing, but the details are on github: GitHub - mtmessinger/ChiltrixPy: Library for connecting over modbus to Chiltrix hardware in general. Built out for the CX34 heat pump and CXI fan coil units. Connecting to Home Assistant · GitHub
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