code: def handle_err(self):
          
          with self.lock:
              if self._state == 'connecting' and self._dst_addrs:
                  self._hup = False
                  self._set_state("connect")
                  return
              self._socket.close()
              self._socket = None
              self._set_state("aborted")
              self._write_queue.clear()
              self._write_queue_cond.notify()
          raise PyXMPPIOError("Unhandled error on socket")
docs: Handle an error reported.