docs: def _serial_close(self, port):
          '''
          Handle close request.
  
          Parameters
          ----------
          port : str
              Device name/port.
          '''
          if port in self.open_devices:
              try:
                  self.open_devices[port].close()
              except Exception as exception:
                  logger.error('Error closing device `%s`: %s', port, exception)
                  return
          else:
              logger.debug('Device not connected to `%s`', port)
              self._publish_status(port)
              return