import time
import signal
import paho.mqtt.client as mqtt

BROKER = "localhost"
PORT = 1883
TOPIC = "python/mqtt/test"

def on_connect(client, userdata, flags, reason_code, properties):
    print(f"Connected (rc={reason_code})")
    client.subscribe(TOPIC)

def on_message(client, userdata, msg):
    print(f"[{msg.topic}] {msg.payload.decode()}")

client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
client.on_connect = on_connect
client.on_message = on_message

client.connect(BROKER, PORT, 60)
client.loop_start()

# Publish one test message
time.sleep(2)
client.publish(TOPIC, "Hello from Paho MQTT!", qos=1)
print("Published. Listening... (Ctrl+C to exit)")

# Block forever until SIGINT
signal.pause()