code: def get_event_stream(self):
          
          if self._event_stream is None:
              self._event_stream = WVAEventStream(self._http_client)
          return self._event_stream
docs: Get the event stream associated with this WVA
  
          Note that this event stream is shared across all users of this WVA device
          as the WVA only supports a single event stream.
  
          :return: a new :class:`WVAEventStream` instance