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elif not data:
print("not data")
break
conn.send(data)
print(ser.portstr)
print(wrdata)
ser.write(wrdata)
print("pass: ",wrdata)
ser.close()
conn.close()

-----------------------nfc 코드 MFRC522 모듈
import RPi.GPIO as GPIO
import spi
import signal
import time

class MFRC522:
NRSTPD = 22

MAX_LEN = 16

PCD_IDLE = 0x00
PCD_AUTHENT = 0x0E
PCD_RECEIVE = 0x08
PCD_TRANSMIT = 0x04
PCD_TRANSCEIVE = 0x0C
PCD_RESETPHASE = 0x0F
PCD_CALCCRC = 0x03

PICC_REQIDL = 0x26
PICC_REQALL = 0x52
PICC_ANTICOLL = 0x93
PICC_SElECTTAG = 0x93
PICC_AUTHENT1A = 0x60
PICC_AUTHENT1B = 0x61
PICC_READ = 0x30
PICC_WRITE = 0xA0
PICC_DECREMENT = 0xC0
PICC_INCREMENT = 0xC1
PICC_RESTORE = 0xC2
PICC_TRANSFER = 0xB0
PICC_HALT = 0x50

MI_OK = 0

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