code: def close(self):
          
  
          if not (yield from super().close()):
              return False
  
          adapters = self._ethernet_adapters + self._serial_adapters
          for adapter in adapters:
              if adapter is not None:
                  for nio in adapter.ports.values():
                      if nio and isinstance(nio, NIOUDP):
                          self.manager.port_manager.release_udp_port(nio.lport, self._project)
  
          yield from self.stop()
docs: Closes this IOU VM.