code: def _flow(self, args):
          
          self.active = args.read_bit()
          self._x_flow_ok(self.active)
docs: Enable/disable flow from peer
  
          This method asks the peer to pause or restart the flow of
          content data. This is a simple flow-control mechanism that a
          peer can use to avoid oveflowing its queues or otherwise
          finding itself receiving more messages than it can process.
          Note that this method is not intended for window control.  The
          peer that receives a request to stop sending content should
          finish sending the current content, if any, and then wait
          until it receives a Flow restart method.
  
          RULE:
  
              When a new channel is opened, it is active.  Some
              applications assume that channels are inactive until
              started.  To emulate this behaviour a client MAY open the
              channel, then pause it.
  
          RULE:
  
              When sending content data in multiple frames, a peer
              SHOULD monitor the channel for incoming methods and
              respond to a Channel.Flow as rapidly as possible.
  
          RULE:
  
              A peer MAY use the Channel.Flow method to throttle
              incoming content data for internal reasons, for example,
              when exchangeing data over a slower connection.
  
          RULE:
  
              The peer that requests a Channel.Flow method MAY
              disconnect and/or ban a peer that does not respect the
              request.
  
          PARAMETERS:
              active: boolean
  
                  start/stop content frames
  
                  If True, the peer starts sending content frames.  If
                  False, the peer stops sending content frames.