I created my first plugin for the Denon Heos line of speakers.
https://github.com/blysik/indigo-heos
It's very basic. It auto-discovers Heos speakers on your network, and lets you create devices from them. It polls each device for state, and has a limited set of actions right now. (Play, pause, stop, volume up, volume down, set volume, and play input from other speaker.)
It's also my first attempt with Python, so be gentle.
Feel free to open github issues and I'll try to address them as I can.
Mods, can I get a blysik's Plugins forum? I intend to have a crack at a Tesla plugin soon also, and would like to group my projects together.
Thanks!