boot.py

from machine import UART
import machine
from network import WLAN
import os
import time
from config import SSID, PSK, WIFI_ENABLED

uart = UART(0, 115200)
os.dupterm(uart)

rtc = machine.RTC()

wlan = WLAN() # get current object, without changing the mode
if WIFI_ENABLED:
    if machine.reset_cause() != machine.SOFT_RESET:
        wlan.init(mode=WLAN.STA)
        # configuration below MUST match your home router settings!!
        #wlan.ifconfig(config=('192.168.1.101', '255.255.255.0', '192.168.1.1', '8.8.8.8'))

    if not wlan.isconnected():
        # change the line below to match your network ssid, security and password
        wlan.connect(SSID, auth=(WLAN.WPA2, PSK), timeout=5000)
        while not wlan.isconnected():
            machine.idle() # save power while waiting
        print('WLAN connection succeeded!')
        print(wlan.ifconfig())
        rtc.ntp_sync("pool.ntp.org")
else:
    wlan.deinit()