a micropython for turning an io pin on or off based on an Adafruit IO feed

main.py

import network
import time
from umqtt.robust import MQTTClient
import os
import sys
from machine import Pin

ADAFRUIT_IO_URL = b'io.adafruit.com'
ADAFRUIT_USERNAME = b'<insert username here>'
ADAFRUIT_IO_KEY = b'<insert Adafruit IO key here>'
ADAFRUIT_IO_FEEDNAME = b'<insert feedname here>'

WIFI_SSID = '<insert wifi network SSID here>'
WIFI_PASSWORD = '<insert wifi password here>'

PIN_NUMBER = 5

onoffpin = Pin(PIN_NUMBER, Pin.OUT)

def cb(topic, msg):
    global p5
    print('Received Data:  Topic = {}, Msg = {}'.format(topic, msg))
    if msg == b"ON": p5.value(0) #LED in on when low on the Lolin32
    else: p5.value(1)

ap_if = network.WLAN(network.AP_IF)
ap_if.active(False)

wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(WIFI_SSID, WIFI_PASSWORD)

MAX_ATTEMPTS = 20
attempt_count = 0

while not wifi.isconnected() and attempt_count < MAX_ATTEMPTS:
    attempt_count += 1
    time.sleep(1)

if attempt_count == MAX_ATTEMPTS:
    print('could not connect to the WiFi network')
    sys.exit()
	
random_num = int.from_bytes(os.urandom(3), 'little')
mqtt_client_id = bytes('client_'+str(random_num), 'utf-8')

client = MQTTClient(client_id=mqtt_client_id, 
                    server=ADAFRUIT_IO_URL, 
                    user=ADAFRUIT_USERNAME, 
                    password=ADAFRUIT_IO_KEY,
                    ssl=False)
     
client.connect()

mqtt_feedname = bytes('{:s}/feeds/{:s}'.format(ADAFRUIT_USERNAME, ADAFRUIT_IO_FEEDNAME), 'utf-8')    
client.set_callback(cb)                    
client.subscribe(mqtt_feedname)  

mqtt_feedname_get = bytes('{:s}/get'.format(mqtt_feedname), 'utf-8')    
client.publish(mqtt_feedname_get, '\0')  

while True:
    client.wait_msg()

Hat tip to Mike Teachman. This builds of his work here: https://github.com/miketeachman/micropython-adafruit-mqtt-esp8266