NTP ESP32-S2

code.py

import wifi
import socketpool
import struct
import time
import sys
from secrets import secrets

NTP_TO_UNIX_EPOCH = 2208988800  # 1970-01-01 00:00:00

packet = bytearray(48)

# connect to wifi
print("Connecting to Wifi")
wifi.radio.connect(secrets["ssid"], secrets["password"])
pool = socketpool.SocketPool(wifi.radio)

loop = 0
while True:
    loop += 1
    print(loop, end=" ")

    # make socket
    print("Creating socket")
    with pool.socket(pool.AF_INET,pool.SOCK_DGRAM) as sock:
        start = time.monotonic()

        sock.settimeout(5)

        # Fill packet
        packet[0] = 0b00100011  # Not leap second, NTP version 4, Client mode

        try:
            print("Sending packet")
            sock.sendto(packet, ("pool.ntp.org", 123))

            size, address = sock.recvfrom_into(packet)
            print("Received packet")
            seconds = struct.unpack_from("!I", packet, offset=len(packet) - 8)[0]
            print("Address:", address)
            print("Time:", time.localtime(seconds - NTP_TO_UNIX_EPOCH))
            print("Duration", time.monotonic() - start)
        except OSError as e:
            sys.print_exception(e)

    print()
    time.sleep(60)