Python之MQTT客户端实现学习笔记

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基于Apollo的MQTT协议服务器端搭建流程请参考我的文章：https://blog.csdn.net/zym326975/article/details/82081717

为了实现基于Python的MQTT客户端，需要安装paho-mqtt：pip install paho-mqtt

基于Python的MQTT客户端订阅者代码的实现

import paho.mqtt.client as mqtt
import time

HOST = "127.0.0.1"
PORT = 61613

def client_loop():
    client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))
    client = mqtt.Client(client_id)    #client_id不能重复，所以使用当前时间
    client.username_pw_set("admin", "password")  #必须设置，否则会返回「Connected with result code 4」
    client.on_connect = on_connect
    client.on_message = on_message
    client.connect(HOST, PORT, 60)
    client.loop_forever()

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

def on_message(client, userdata, msg):
    print(msg.topic+" "+msg.payload.decode("utf-8"))

if __name__ == '__main__':
    client_loop()

基于Python的MQTT客户端发布者代码的实现 

import paho.mqtt.publish as publish
import time

HOST = "127.0.0.1"
PORT = 61613
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    client.subscribe("test")

def on_message(client, userdata, msg):
    print(msg.topic+" "+msg.payload.decode("utf-8"))

if __name__ == '__main__':
    client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))
    publish.single("test", "你好 MQTT", qos=1, hostname=HOST,port=PORT,client_id=client_id, auth = {'username':"admin", 'password':"password"})