Zehnder ComfoAir CA350 integration via serial connection (RS232) and MQTT

As I have mentioned a couple of times the canbus tranciever you got is the wrong component. You need one RS232/TTL module (e.g. https://de.aliexpress.com/item/1005003782115714.html), and then a second one if you want to also connect the confosense panel eventually.

The final structure is like this:
ComfoAir (Green Plug) <—> RS232/TTL <—> ESP32 ↔ TTL/RS232 ↔ (GreenCable) ComfoSense

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Thank you much more clear now, will order the module and try it out