FYI. I just posted a Homebridge AlarmDecoder platform plugin at https://github.com/michaelpmaley/homebridge-alarmdecoderplatform with support for the panel and motion & contact sensors based upon https://github.com/aficustree/homebridge-alarmdecoder. However, I see that https://github.com/aficustree/homebridge-alarmdecoder-platform beat me to the punch.
It is my first Github project and first Node.js project and I had a lot of fun doing it. Constructive feedback is appreciated.
Thanks!