This is a program for toggling the WiFi Switch from internet using MQTT

toggle_switch.py

from umqtt.simple import MQTTClient
from machine import Pin
import ubinascii
import machine
import micropython



global switch_state
switch_state = True

CLIENT_ID = ubinascii.hexlify(machine.unique_id())
SERVER = 'localhost'
TOPIC = b"home/tv"

#-- Pin which the relay is connected to
relayPin = 12
p6 = Pin(relayPin, Pin.OUT)    # create output pin on GPIO6

#-- Connected to switch with internal pullup enabled
# buttonPin = 0
# buttonDebounce = 0
# p3 = Pin(buttonPin, Pin.OUT)    # create output pin on GPIO3

#-- MQTT led
mqttLed=13
p13 = Pin(mqttLed, Pin.OUT)    # create output pin on GPIO7
p13.low()

def sub_cb(topic,msg):
    global switch_state
    print((topic, msg))
    if msg == b"on":
        p13.value(0)
        p6.value(1)
        switch_state = 1
    elif msg == b"off":
        p13.value(1)
        p6.value(0)
        switch_state = 0

def main(server=SERVER):
    c = MQTTClient(CLIENT_ID, server)
    # Subscribed messages will be delivered to this callback
    c.set_callback(sub_cb)
    c.connect()
    c.subscribe(TOPIC)
    print("Connected to %s, subscribed to %s topic" % (server, TOPIC))
    try:
        while 1:
            # micropython.mem_info()
            c.wait_msg()
    finally:
        c.disconnect()

if __name__ == '__main__':
    main()