python mqtt 客户端的实现代码实例

Python  /  管理员 发布于 7年前   243

这篇文章主要介绍了python mqtt 客户端代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

安装paho-mqtt

pip install paho-mqtt -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

python消息收发实现

import paho.mqtt.client as mqttfrom multiprocessing import Processimport camera_person_numMQTTHOST = "172.19.4.4"MQTTPORT = 1883mqttClient = mqtt.Client()

# 连接MQTT服务器def on_mqtt_connect():  mqttClient.connect(MQTTHOST, MQTTPORT, 60)  mqttClient.loop_start()

# 消息处理函数def on_message_come(lient, userdata, msg):  print(msg.topic + ":" + str(msg.payload.decode("utf-8")))  # 消息处理开启多进程  p = Process(target=talk, args=("/camera/person/num/result", msg.payload.decode("utf-8")))  p.start()

# subscribe 消息订阅def on_subscribe():  mqttClient.subscribe("test", 1) # 主题为"test"  mqttClient.on_message = on_message_come # 消息到来处理函数# publish 消息发布def on_publish(topic, msg, qos):  mqttClient.publish(topic, msg, qos);

# 多进程中发布消息需要重新初始化mqttClientdef talk(topic, msg):  cameraPsersonNum = camera_person_num.CameraPsersonNum(msg)  t_max, t_mean = cameraPsersonNum.personNum()  mqttClient = mqtt.Client()  mqttClient.connect(MQTTHOST, MQTTPORT, 60)  mqttClient.loop_start()  mqttClient.publish(topic, '{"max":' + str(t_max) + ',"mean:"' + str(t_mean) + '}', 1)

def main():  on_mqtt_connect()  on_subscribe()  while True:    passif __name__ == '__main__':  main()

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