code: def recv_framer(self, value):
          
  
          if not isinstance(value, framers.Framer):
              raise ValueError("framer must be an instance of tendril.Framer")
  
          self._recv_framer = value
docs: Set the framer in use for the receiving side of the
          connection.  The framer state will be reset next time the
          framer is used.