Paho MQTT Python 客户端使用

Paho MQTT Python 客户端使用

1. 安装mqtt for python库

# 安装 paho-mqtt 2.X
pip install paho-mqtt

2. 一个简单的示例

import paho.mqtt.client as mqtt
import json

# 连接服务器应答回调
def on_connect(client, userdata, flags, reason_code, properties):
    # 打印连接状态码
    print(f"Connected with result code {
     
     reason_code}")
    # 订阅主题 "TEST/#",这里订阅前缀为TEST/的所有主题
    client.subscribe('TEST/#')

# 收到服务器消息回调
def on_message(client, userdata, msg):
    # 打印订阅的主题消息
    print(msg.topic + " " + str(msg.payload))
    # 解析json
    obj = json.loads(msg.payload)
    print(f"parse json:{
     
     obj}")
    # 遍历字典(dict)
    for k, v in obj.items():
        print(f"key = {
     
     k}, value = {
     
     v}")

# 创建MQTT使用V2版本API
mqttc = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)

# 注册回调
mqttc.on_connect = on_connect
mqttc