from pirc522 import RFID

import RPi.GPIO as GPIO
import sys

import signal

GPIO.setwarnings(False)

rdr = RFID()

def sigint_handler(signal, frame):
  rdr.cleanup()
  sys.exit(0)

signal.signal(signal.SIGINT, sigint_handler)
signal.signal(signal.SIGTERM, sigint_handler)

while True:
  rdr.wait_for_tag()
  (error, tag_type) = rdr.request()
  if not error:
    (error, uid) = rdr.anticoll()
    if not error:
      tag_id = ''.join(hex(x)[2:].zfill(2) for x in uid)
      print(tag_id)
      sys.stdout.flush()

rdr.cleanup()