NTP time update for micropython

ntp.py

import socket
import ustruct
import time
from machine import RTC

# datetime.date(2000, 1, 1) - datetime.date(1900, 1, 1)
NTP_DELTA = 3155673600
NTP_SERVER = '0.cn.pool.ntp.org'

def get_ntp_time():
    data = bytearray(48)
    data[0] = 0x1B
    val = 0

    addr = socket.getaddrinfo(NTP_SERVER, 123)[0][-1]
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.sendto(data, addr)
    data, addr = sock.recvfrom(2048)
    val = ustruct.unpack("!12I", data)[10]

    return val - NTP_DELTA


def sync():
    ts = get_ntp_time()
    tm = time.localtime(ts)
    rtc = RTC()
    rtc.datetime(tm[0:3] + (0,) + tm[3:6] + (0,))

if __name__ == '__main__':
    sync()
    print("Current time:", time.localtime())