I was going to create the device myself and all, but given the cost of this beauty, I decided to give it s try instead. It works seamlessly in my MrCool 12kBTU mini split! I have to push it hard into the USB female of the unit because it seems to be non-standard, but that was all. My next question was going to be 'how about updating esphome on it?', and it was quickly solved (see Downloads for the yaml file and the firmware). Great job, guys! Thank you.