matekasse_NFC-Reader/NFC_Reader.py

import time
import nfc
import subprocess
import requests
import oled
from multiprocessing import Process

url="http://172.16.1.105/api/"

def get_reader():
  devices = subprocess.check_output("lsusb")
  for i in devices.split(b'\n'):
    if str(i).__contains__("Advanced Card Systems, Ltd ACR122U"):
      bus = str(i).split(":")[0].split(" Device ")[0].split("Bus ")[1]
      device = str(i).split(":")[0].split("Device ")[1]
      return("usb:{}:{}".format(bus, device))
  raise Exception("\n\n Error: NFC reader not found")
    
def onTagSense(tag):
    id = int.from_bytes(tag.identifier, "big")
    response = requests.post(f"{url}tag_id", data={"id":id})
    
    #try:
    if response.json()["mode"] == "balance" or response.json()["mode"] == "message":
        oled.balance(response.json()["username"], response.json()["balance"])
        return True
    #except:
    #    None
    return False

def start_nfc_normal():  
  device = get_reader()
  clf = nfc.ContactlessFrontend(device) 
  clf.open(device)
  while True:
    clf.connect(rdwr={'on-connect': onTagSense, 'beep-on-connect': True })
    time.sleep(0.75)

if __name__ == "__main__":
    start_nfc_normal()