code: def stream(self, report, callback=None):
          
  
          if self._push_channel is None:
              return
  
          self._push_channel.stream(report, callback=callback)
docs: Stream a report asynchronously.
  
          If no one is listening for the report, the report may be dropped,
          otherwise it will be queued for sending
  
          Args:
              report (IOTileReport): The report that should be streamed
              callback (callable): Optional callback to get notified when
                  this report is actually sent.