Handle unknown device types

For devices that we have no idea how to handle, i.e. no services or
expose entries were processed, we return ErrUnknownDeviceType and skip
it during AddDevicesFromJSON(). This prevents a device from showing up
where HomeKit says it's not supported.

bridge.go

@@ -393,7 +393,7 @@ func (br *Bridge) AddDevicesFromJSON(devJson []byte) error {
 
 		acc, exp, err := createAccessory(&dev)
 		if err != nil {
-			if err == ErrDeviceSkipped {
+			if err == ErrDeviceSkipped || err == ErrUnknownDeviceType {
 				continue
 			}
 			return err