基于python的mqtt订阅推送例子

前提：mqtt消息服务器

一、pip install paho-mqtt

二、写一个推送客户端  Publish.py  

# __author: gy-chen
# data: 2020/5/23
# -*- coding: UTF-8 -*-
 4 

import paho.mqtt.client as mqtt


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


def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))


client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect('ip', 1883, 600)   # ip为消息服务器的ip地址
# 600为keepalive的时间间隔
while True:
    msg = input("请输入推送消息：")
    client.publish('topic', payload=msg, qos=0)

三、写一个订阅客户端 Subscribe.py 

# __author: gy-chen
# data: 2020/5/23
# -*- coding: UTF-8 -*-

import paho.mqtt.client as mqtt


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


def on_message(client, userdata, msg):
    topic = msg.topic
    message = str(msg.payload, encoding="utf-8")
    print(topic + "：" + message)


client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
# client.on_disconnect = on_disconnect
client.connect('ip', 1883, 600)  # 600为keepalive的时间间隔
client.subscribe('topic', qos=0)
client.loop_forever()  # 保持连接

 例子：

# __author: gy-chen
# data: 2020/5/23
# -*- coding: UTF-8 -*-

import paho.mqtt.client as mqtt
import json
import time

HOST = "ip"   # 消息服务器的ip地址
PORT = 1883
client_id = "1083421xxxxx"                       # 没有就不写，此处部分内容用xxx代替原内容，下同


def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    client.subscribe("data/receive")         # 订阅消息


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


def on_subscribe(client, userdata, mid, granted_qos):
    print("On Subscribed: qos = %d" % granted_qos)


def on_disconnect(client, userdata, rc):
    if rc != 0:
        print("Unexpected disconnection %s" % rc)


data = {
    "type": 2,
    "timestamp": time.time(),
    "messageId": "9fcda359-89f5-4933-xxxx",
    "command": "xx/recommend",
    "data": {
        "openId": "xxxx",
        "appId": 1,
        "recommendType": "temRecommend"
    }
}
param = json.dumps(data)
client = mqtt.Client(client_id)
client.username_pw_set("xxxxxx", "xxxxxx")
client.on_connect = on_connect
client.on_message = on_message
client.on_subscribe = on_subscribe
client.on_disconnect = on_disconnect
client.connect(HOST, PORT, 60)
client.publish("data/send", payload=param, qos=0)     # 发送消息
client.loop_forever()