import paho.mqtt.client as mqtt


def on_connect(_client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    client.subscribe("test/topic")


def on_message(_client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))


client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect("localhost", 1883, 60)

client.loop_forever()

"""In this example, we create a new instance of the mqtt.Client class and set up the on_connect and on_message 
callback functions. The on_connect function is called when the client successfully connects to the broker, 
and the on_message function is called when a message is received on a subscribed topic.

Then, we call the connect method to connect to the MQTT broker running on the local machine on port 1883, and set the 
keepalive value to 60 seconds.

Finally, we call the loop_forever method to start the client and begin processing incoming messages. This method 
blocks the program execution and runs the client loop in a loop until the client is disconnected. (ChatGPT)"""