Hello there, I would like to thank you all very very much and especially @julianpas who supported also via private messages.
Please let me share my basic schematic for those like me that are no experts but just hobbists, I believe this would be beneficial for who is interested.
My machine: Comfoair 180
Controller: Comfosense
Adapter: green RS232 plug
DC stepdown to 5V
Dual RS232-TTL interface
Code: look for esphome-comfoair by @julianpas on github
I proxied the Comnfosense along with the ESP32 (wroom32D) so I can both control my unit either from the ESP or the Comfosense wall mounted.
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