[Depecrated] My Next Manager for your Nest® Tstats (firmware below 2.3), Protects and Sensors: all Nest attributes available (home/away, motion detection, setTargetHumidity, setHotWaterBoost) for automation-and no throttling!

⚙️ Custom Apps and Drivers Custom Drivers
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Looks like it supports modbus tcp/mqtt and BACnet MSTP... What if I can send/receive commands to with mqtt or similar? Still no way to make it work?

Edit: I found a HA thread for the MC6 which I think is the same exact hardware here: MC6 Thermostat - #315 by fabyano - Third party integrations - Home Assistant Community

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Closed per OP's request.