code: def _recv_close_ok(self, method_frame):
          '''
          Receive a close ack from the broker.
          '''
          self.channel._closed = True
          self.channel._closed_cb(f _recv_close_ok(self, method_frame):
          '''
          Receive a close ack from the broker.
          '''
          self.channel._closed = True
          self.channel._closed_cb()
docs: Receive a close ack from the broker.