nfc helper script

mynfctool.py

# PC companion to MyNFCTestApp
# connect to an Android device that is connected via adb tunnel
# 
# connect vai adb
# -------------------------------------------------
# set PATH=D:\tools\platform-tools;%PATH%
# # switch to adb wifi connection -----------------
# adb devices
#   (e.g. 773X12X6M)
# adb -s 773X12X6M shell ip -f inet addr show wlan0
# adb -s 773X12X6M tcpip 5555
# adb -s 773X12X6M connect 192.168.178.107:5555
# adb forward tcp:8000 tcp:8000
# -------------------------------------------------
# commands:
#   apdu, pay, ndef, ...
#
# 2022-09-30 started
# 
# use in REPL:
# from mynfctool import *
# send_cmd('apdu 00 A4 04 00 0C D2 76 00 01 35 4B 41 4E 4D 30 31 00 00')
#
# CLI:
# python -c "from mynfctool import *;send_cmd('apdu 00 A4 04 00 0C D2 76 00 01 35 4B 41 4E 4D 30 31 00 00')"

import socket

sock = None

def byte2hex(b):
    #print('hex:', [hex(i) for i in b])
    return ("".join("%02x " % i for i in b)).strip()

def hex2byte(data):
    s = data.replace(' ', '')
    b = bytearray(int(len(s) / 2))
    for i in range(int(len(s) / 2)):
        b[i] = int(s[2*i:2*i+2], 16)
    return b

def sock_connect():
    global sock
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect(("127.0.0.1", 8000))

def sock_close():
    global sock
    if not(sock is None):
        sock.close()
        sock = None

def send_cmd(cmd):
    global sock
    if sock is None:
        sock_connect()
    try:
        sock.send((cmd + "\n").encode())
        sock.settimeout(10)#sec
        ret = sock.recv(100)
        while(not(b"\r\n" in ret)):
            ret = ret + sock.recv(100)
        print("<= " + ret.decode("ascii"))
        return ret
    except Exception as ex:
        print("error: " + str(ex))
        sock_close()
        return None

if __name__ == "__main__":
    sock_connect()
    send_cmd("apdu 00 A4 04 00")
    sock_close()