[Snap] Give add-ons access to Bluetooth

[benfrancis]

Some add-ons need access to a Bluetooth radio in order to work.

This ma require the bluez and/or bluetooth-control interface. I understand access to these interfaces is not usually granted by default.

[dilyn-corner]

bluetooth-control should offer you sufficient control over the bluetooth stack, but this depends on how you've implemented it. It's possible you may have to rely on the bluez interface.

You are correct that this interface is not autoconnecting.