mqtt_do.py

import simple as umqtt
SERVER="dmarkey.com"
PORT=1883
CLIENT_ID="asafsd"
RELAY="/sys/class/leds/tp-link:blue:relay/brightness"
SET = "/home/switches/homeswitch1/set"
STATUS = "/home/switches/homeswitch1"

client = umqtt.MQTTClient(CLIENT_ID, SERVER, PORT)
def callback(topic, data):
    if data == b'1':
        open(RELAY, "w").write('1')
        client.publish(STATUS,'1', retain=True)
    else:
        open(RELAY, "w").write('0')
        client.publish(STATUS,'0', retain=True)

client.connect()
client.set_callback(callback)
client.subscribe(SET)

while True:
    client.wait_msg()

how to use?any instruction?