Sonos binding does not support INCREASE/DECREASE for volume about openhab-addons HOT 4 CLOSED

Kai, the Play:1 does not support the "classical" RenderingControl GENA subscription that plays us back the volume of the Sonos player, yielding the NPE.

We have two options basically:

1. keep a single ZonePlayer thing type, subscribing to "all" the GENA subscriptions necessary, and then doing the necessary checks in the handler code for those devices that will fail on part of the subscriptions, like the Play:1
2. develop different thing types for each type of sonos player, and hopefully factoring out a base handler class, and then hope that we things manageable as we add new functionality

With respect to Play:1 I still have to figure out how then it reports is volume. I did not notice this bug as I intend to do functional tests again a CONNECT:AMP

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Linked to #45

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Kai, your Play:1 is stand-alone?

Just figured out that Sonos, whenever you associate the P1 to a Sub of playbar, reconfigures the embedded unpin devices that are "broadcast", and as a consequence for the associated devices the RenderingControl service is not available anymore (as volume is not set by the special group coordinator)

They really made things complicated ;-)

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This now works after fixing #98.

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