Micropython async reconnect

main.py

import uasyncio  # upip install this if not present
from umqtt.simple import MQTTClient
import webrepl

# you only need to connect once
# it's more like WiFi settings then connect
sta = network.WLAN(network.STA_IF)
sta.connect('<SSID>', '<PASSWD>')

mqtt = MQTTClient(<MQTT_SETTINGS>)

# method that checks connection and async sleeps 3 s if not connected
async def connect():
    while not sta.isconnected():
        await uasyncio.sleep(3)
    webrepl.start()  # restarts the webrepl after connection

# main loop
async def main():
    print('\nStarting up...')
    firstboot = True
    while True:
        if not sta.isconnected() or firstboot:
            firstboot = False
            print('Connecting...')
            await connect()
            print('Reconnect MQTT')
            mqtt.connect()
            print('listening on {0}'.format(*sta.ifconfig()))

        do_whatever()  # read sensors or whatever
        await uasyncio.sleep(5)  # async sleep for a while

uasyncio.run(main())