Search all of the capabilities of the device and return the supported binary state field.
        Default to returning powered.

def binary_state_name(self):
        """
        Search all of the capabilities of the device and return the supported binary state field.
        Default to returning powered.
        """
        return_field = "powered"
        _capabilities = self.json_state.get('capabilities')
        if _capabilities is not None:
            _fields = _capabilities.get('fields')
            if _fields is not None:
                for field in _fields:
                    if field.get('field') in SUPPORTED_BINARY_STATE_FIELDS:
                        return_field = field.get('field')
        return return_field