code: def start(self, channel):
          
  
          super(TileBasedVirtualDevice, self).start(channel)
  
          for tile in self._tiles.values():
              tile.start(channel=channel)
docs: Start running this virtual device including any necessary worker threads.
  
          Args:
              channel (IOTilePushChannel): the channel with a stream and trace
                  routine for streaming and tracing data through a VirtualInterface