Update. Comms are working and most functions appear to work.
I have decided to create three versions of the driver:
Basic Music Player - Music player functions with abilities similar to Sonos player. Enhanced with the device controls (on/off, inputSource, equalizer preset, shuffle/repeat modes), audio notification, and text-to-speech.
Player Control - Basic Music Player plus Presets. Uses the Samsung Multiroom App as a set up assistant, then can play channels without going to Multiroom. (In SmartThings, I can get TuneIn, iHeartRadio stations, 8Tracks, Pandora music streams, and Amazon playlists.)
Group Speaker - Player Control plus Group Presets and controls.
