百度IOT Hub （二）设备节点相互通信

最新推荐文章于 2023-03-03 08:01:35 发布

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本文介绍如何使用Python和paho MQTT库在百度物联网平台上创建发送者(MyMonitor_Sender)和订阅者(MyMonitor)，实现设备间的通信。通过TLS安全连接，发送者向指定主题发布当前时间消息，而订阅者则接收并打印这些消息。

参见https://cloud.baidu.com/doc/IOT/s/Wjwvy7808

https://cloud.baidu.com/doc/IOT/s/vjwvy6y0v

一个物影子对应一个设备节点。针对同一物模型 Monitor创建两个物影子。

MyMonitor_Sender 负责publish topic

import time
import paho.mqtt.client as mqtt
import datetime

def on_publish(msg, rc):
if rc == 0:
print("publish success, msg = " + msg)

def on_connect(client, userdata, flags, rc):
print("Connection returned " + str(rc))

client = mqtt.Client(
client_id="MyMonitor_Sender", #client_id
clean_session=True,
userdata=None,
protocol='MQTTv311'
)

trust = "root_cert.pem"
user = "yourEndPoint/MyMonitor_Sender"
pwd = "xxxxxxxxx"
endpoint = "yourEndPoint.mqtt.iot.gz.baidubce.com"
port = 1884
topic = "$baidu/iot/general/as" #目前百度Demo有问题。

client.tls_insecure_set(True)
client.tls_set(trust)
client.username_pw_set(user, pwd)
client.connect(endpoint, port, 60)
client.on_connect = on_connect

client.loop_start()
time.sleep(2)
count = 0
while count < 5:
count = count + 1
msg = str(datetime.datetime.now())
rc , mid = client.publish(topic, payload=msg, qos=1) #qos
on_publish(msg, rc)
time.sleep(2)

MyMonitor 负责Subscribe topic :

#!/usr/bin/env python

import paho.mqtt.client as mqtt

trust = "root_cert.pem"
user = "yourEndPoint/MyMonitor"
pwd = "xxxxxxxxxxxx"
endpoint = "yourEndPoint.mqtt.iot.gz.baidubce.com"
port = 1884
topic = "$baidu/iot/general/as"

def on_connect(client, userdata, flags, rc):
print("Connected with result code "+str(rc))
client.subscribe(topic, qos=1) #qos

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

client = mqtt.Client(
client_id="MyMonitor",
clean_session=True,
userdata=None,
protocol='MQTTv31'
)

client.tls_insecure_set(True)
client.tls_set(trust)
client.username_pw_set(user, pwd)
client.on_connect = on_connect
client.on_message = on_message
client.connect(endpoint, port, 60)
client.loop_forever()

运行结果：