import json
import sys

引入mqtt包

import paho.mqtt.client as mqtt

应用独立线程运行

from threading import Thread

建设mqtt连贯

def on_connect(client, userdata, flag, rc):

if rc == 0:    # 连贯胜利    print("Connection successful")elif rc == 1:    # 协定版本谬误    print("Protocol version error")elif rc == 2:    # 有效的客户端标识    print("Invalid client identity")elif rc == 3:    # 服务器无奈应用    print("server unavailable")elif rc == 4:    # 谬误的用户名或明码    print("Wrong user name or password")elif rc == 5:    # 未经受权    print("unaccredited")print("Connect with the result code " + str(rc))# 订阅频道# client.subscribe('31765425213673472', qos=2)

当与代理断开连接时调用

def on_disconnect(client, userdata, rc):

#  rc == 0回调被调用以响应disconnect（）调用# 如果以任何其余值断开连接是意外的，例如可能呈现网络谬误。if rc != 0:    print("Unexpected disconnection %s" % rc)

当收到对于客户订阅的主题的音讯时调用。

def on_message(client, userdata, msg):

print(msg.topic + " " + str(msg.payload))json_msg = json.loads(msg.payload.decode('utf-8'))# 退出集体逻辑pass

当应用应用publish()发送的音讯曾经传输到代理时被调用。

def on_publish(client, obj, mid):

print("on_Publish, mid: " + str(mid))

当代理响应订阅申请时被调用

def on_subscribe(client, userdata, mid, granted_qos):

print("on_Subscribed: " + str(mid) + " " + str(granted_qos))

当代理响应勾销订阅申请时调用。

def on_unsubscribe(client, userdata, mid):

print("on_unsubscribe, mid: " + str(mid))

当客户端有日志信息时调用

def on_log(client, obj, level, string):

print("on_Log:" + string)

mqtt订阅启动函数

def mqtt_subscribe():

global clientclient.loop_forever()

mqtt公布启动函数

def mqtt_publish(sensor_data, topic='xxxxxxxx', qos=2):

global clienttry:    client.publish(topic=topic, payload=sensor_data, qos=qos)except KeyboardInterrupt:    print("EXIT")    # 这是网络循环的阻塞模式，[金融期货](https://www.gendan5.com/futures/ff.html)直到客户端调用disconnect（）时才会返回。它会主动解决从新连贯。    client.disconnect()    sys.exit(0)

client = mqtt.Client()

启动函数

def mqtt_run():

# 账号密码验证放到最后面client.username_pw_set('user', 'user')# client = mqtt.Client()# 建设mqtt连贯client.on_connect = on_connectclient.on_subscribe = on_subscribeclient.on_message = on_message# 当与代理断开连接时调用client.on_disconnect = on_disconnectclient.on_log = on_log# 绑定 MQTT 服务器地址broker_ip = ''# MQTT服务器的端口号# client.connect(host=broker_ip, port=1883, keepalive=6000)client.connect(host=broker_ip, port=1883)client.reconnect_delay_set(min_delay=1, max_delay=2000)client.subscribe('xxxxxxxx', qos=0)# 创立线程去继续接管订阅信息subscribe_thread = Thread(target=mqtt_subscribe)subscribe_thread.start()

if name == "__main__":

mqtt_run()