Python MQTT 订阅最小示例 (Paho-MQTT)

#!/usr/bin/env python3
import paho.mqtt.client as mqtt

def on_connect(client, userdata, flags, rc):
    # 这将在客户端连接后调用一次
    print(f"Connected with result code {rc}")
    # 在这里订阅！
    client.subscribe("my-topic")

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

client = mqtt.Client("mqtt-test") # client ID "mqtt-test"
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set("myusername", "aeNg8aibai0oiloo7xiad1iaju1uch")
client.connect('127.0.0.1', 1883)
client.loop_forever()  # 启动网络守护进程