In case it's helpful to anyone, I put this together to drive our Advantage Air system:

https://git.nethack.net/rob/aircon

Essentially it just talks to the android tablet API to do things so it's no help if (when) the tablet dies, but it means I can do things like:

- have the entire unit turn on/off as needed based on average zone temperatures

- open/close vents based on room owners' devices being online, or temperatures of nearby zones

- dump zone temperatures to influxdb