Thank you very much for sharing this, Levin, I was not aware. Is the ComfoConnect Pro something new or was it just under my radar in the past years?
To be honest I don’t know if this is something new, but it works 
I’m happy if this helps anybody because I had to do a lot of research to find this solution, very frustrating. Also looked at Helios, but they stopped support for modbus TCP and only have Modbus RTU now…
Also the binding seems not to work for current Helios devices.
EDIT: For the second time, Modbus stopped working on device side. I can reach IP and Port but get errors while trying to read Modbus registers. Seems to be something on the device side. I reached out to Zehnder to hopefully get some help.
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