MQTT_Client.py

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("test")
    

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))

def on_publish(client, userdata, result):
    print("published")

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(username="Username", password="Password")
client.on_publish = on_publish
client.connect("URL/IP", 1883, 60)
client.subscribe("test")
client.publish("test", "Ok")

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()