code: def _init_devices(self):
          
          if not settings.PDU_CONTROLLER_TYPE:
              if settings.AUTO_DUT:
                  return
  
              for device in settings.GOLDEN_DEVICES:
                  port, _ = device
                  try:
                      with OpenThreadController(port) as otc:
                          logger.info('Resetting %s', port)
                          otc.reset()
                  except:
                      logger.exception('Failed to reset device %s', port)
                      self.history.mark_bad_golden_device(device)
  
              return
  
          tries = 3
          pdu_factory = PduControllerFactory()
  
          while True:
              try:
                  pdu = pdu_factory.create_pdu_controller(settings.PDU_CONTROLLER_TYPE)
                  pdu.open(**settings.PDU_CONTROLLER_OPEN_PARAMS)
              except EOFError:
                  logger.warning('Failed to connect to telnet')
                  tries = tries - 1
                  if tries:
                      time.sleep(10)
                      continue
                  else:
                      logger.error('Fatal error: cannot connect to apc')
                      raise
              else:
                  pdu.reboot(**settings.PDU_CONTROLLER_REBOOT_PARAMS)
                  pdu.close()
                  break
  
          time.sleep(len(settings.GOLDEN_DEVICES))
docs: Reboot all usb devices.
  
          Note:
              If PDU_CONTROLLER_TYPE is not valid, usb devices is not rebooted.