def start(self) -> None:
        """Connect websocket to deCONZ."""
        if self.config:
            self.websocket = self.ws_client(
                self.loop, self.session, self.host,
                self.config.websocketport, self.async_session_handler)
            self.websocket.start()
        else:
            _LOGGER.error('No deCONZ config available')
Connect websocket to deCONZ.