boot.py

# boot.py
import config
import network
import utime
import ntptime
import gc
import machine
## ftp access
#from ftp import ftpserver

def do_connect():
    sta_if = network.WLAN(network.STA_IF)
    start = utime.time()
    timed_out = False

    if not sta_if.isconnected():
        print('connecting to network...')
        sta_if.active(True)
        sta_if.connect(config.wifi_config["ssid"], config.wifi_config["password"])
        while not sta_if.isconnected() and \
            not timed_out:        
            if utime.time() - start >= 20:
                timed_out = True
            else:
                pass

    if sta_if.isconnected():
        ntptime.settime()
        print('network config:', sta_if.ifconfig())
    else: 
        print('internet not available')

    return timed_out

wdt = machine.WDT(timeout=config.app_config["watchdog"])
try:
    wdt.feed()
    timed_out = do_connect()
    if timed_out:
        utime.sleep_ms(10000)
        machine.reset()
    gc.collect()
except KeyboardInterrupt:
    raise

except:
    utime.sleep_ms(10000)
    machine.reset()