code: def flash(self, flash=True):
          
          if flash:
              action = canstat.kvLED_ACTION_ALL_LEDS_ON
          else:
              action = canstat.kvLED_ACTION_ALL_LEDS_OFF
  
          try:
              kvFlashLeds(self._read_handle, action, 30000)
          except (CANLIBError, NotImplementedError) as e:
              log.error('Could not flash LEDs (%s)', e)
docs: Turn on or off flashing of the device's LED for physical
          identification purposes.