code: def stop_capture(self, port_number):
          
  
          if not self._ethernet_adapter.port_exists(port_number):
              raise VPCSError("Port {port_number} doesn't exist in adapter {adapter}".format(adapter=self._ethernet_adapter,
                                                                                             port_number=port_number))
  
          nio = self._ethernet_adapter.get_nio(0)
  
          if not nio:
              raise VPCSError("Port {} is not connected".format(port_number))
  
          nio.stopPacketCapture()
  
          if self.ubridge:
              yield from self._ubridge_send('bridge stop_capture {name}'.format(name="VPCS-{}".format(self._id)))
  
          log.info("VPCS '{name}' [{id}]: stopping packet capture on port {port_number}".format(name=self.name,
                                                                                                id=self.id,
                                                                                                port_number=port_number))
docs: Stops a packet capture.
  
          :param port_number: port number