code: async def shutdown(self, connmark = -1):
          '''
          Can call without delegate
          '''
          if connmark is None:
              connmark = self.connmark
          self.scheduler.emergesend(ConnectionControlEvent(self, ConnectionControlEvent.SHUTDOWN, True, connmark)ync def shutdown(self, connmark = -1):
          '''
          Can call without delegate
          '''
          if connmark is None:
              connmark = self.connmark
          self.scheduler.emergesend(ConnectionControlEvent(self, ConnectionControlEvent.SHUTDOWN, True, connmark))
docs: Can call without delegate