mqtt精简应用python物联网

直接上代码

pub.py；向已建立好的mqtt服务，发送消息

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('mqtt.eclipseprojects.io', 1883, 600) 
i=20
while i>0:
    i-=1
    client.publish('fifa', payload='next_sub,%s'%i, qos=0) 

print('send,%s'%i) 
client.loop_forever() 

sub.py；当mqtt服务已建立，可以接收消息。

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('mqtt.eclipseprojects.io', 1883, 600) 
client.subscribe('fifa', qos=0)
client.loop_forever() 

mqtt.eclipseprojects.io，是别人已搭建的mqtt服务器地址，如果想用自己的，可以自行搭建mqtt服务器。


pub_sub.py  收！发！

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('mqtt.eclipseprojects.io', 1883, 600) 
client.subscribe('fifa', qos=0)
i=20
while i>0:
    i-=1
    client.publish('fifa', payload='next_sub,%s'%i, qos=0)
    print('send_pub,%s'%i)
client.loop_forever()