I don’t have CoRE installed. As I’m in the U.K. and GitHub isn’t working for us I wasn’t sure if it was worth the effort doing a manual install (if that’s possible). However I have installed Netatmo manually plus all handlers and also Nest with handlers (and SmartTiles) so I think I should be able to get it going if it’s something that you think would be useful?
So far for Sonos I have installed Speaker Notifyer With Sound (which is working as it should considering I only got the hub a couple of days ago) which made the wife jump the first time she came home. I have setup 5 notify with sound (welcome home to me (with a 5 minute delay before the message is spoken as I haven’t fitted the door sensor yet so it allows 5 minutes after crossing into the geofence zone), to the wife (with the same 5 minute delay), when Smoke is Detected on Nest Protect upstairs, Smoke Detected on Nest Protect downstairs, good night message), Speaker Weather Forecast (triggered in the kitchen Sonos Play 1 when the Hue Motion Sensor detects movement in the kitchen and turns the Hue light on first thing in the morning) and Speaker Control to make the bedroom Sonos turn on when I run the night routine (which shuts off all downstairs Hue bulbs, all Sonos speakers (apart from the bedroom), all Harmony Ultimate hub Remote activities and turn Nest down low.
The device handler is just the default Sonos (Connect) that came up when the hub powered up and was detecting devices (I think that’s what your asking isn’t it?)