I finally manage to work a kind of API in order to encode/decode x2d frame on c and on python. I will create the esphome application and provide all the code on the repository. I updated the repository with the code, I can now monitor status and set order on my 3 zones. The missing part is the way ...

Many thanks to everyone for this reversing. I'm currently trying to correctly implement/clean all the protocol decoding/encoding. I have now a really simple python code (inspired by @poloalexis one). But I still don't understand the association part. I have only one X2D device (Calybox) and I want ...