code: def stream_messages(self):
          
          if self._stream_messages is None:
              self._stream_messages = StreamMessageList(
                  self._version,
                  service_sid=self._solution['service_sid'],
                  stream_sid=self._solution['sid'],
              )
          return self._stream_messages
docs: Access the stream_messages
  
          :returns: twilio.rest.sync.v1.service.sync_stream.stream_message.StreamMessageList
          :rtype: twilio.rest.sync.v1.service.sync_stream.stream_message.StreamMessageList