from paho.mqtt import client as mqtt_client

broker = 'localhost'
port = 1883
topic = "test/topic"
client_id = "python_subscriber"

def connect_mqtt():
    def on_connect(client, userdata, flags, rc):
        if rc == 0:
            client.subscribe(topic)
    client = mqtt_client.Client(client_id)
    client.on_connect = on_connect
    client.connect(broker, port)
    return client

def on_message(client, userdata, msg):
    print(f"Mesaj primit pe topicul '{msg.topic}': {msg.payload.decode()}")

client = connect_mqtt()
client.on_message = on_message
client.loop_forever()