code: def list():
          
          try:
              devs = hid.enumerate(VENDOR_ID,PRODUCT_ID)
              serials = list(map(lambda d:d.get('serial_number'), devs))
              return serials
          except IOError as e:
              return []
docs: List blink(1) devices connected, by serial number
          :return: List of blink(1) device serial numbers