<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def start(self):
 """Connect websocket to SPC Web Gateway."""

        self._websocket = AIOWSClient(loop=self._loop,
                                      session=self._session,
                                      url=self._ws_url,
                                      async_callback=self._async_ws_handler)
        self._websocket.start()