mqtt华为云小程序

以下是使用MQTT协议连接华为云IoT平台的示例代码：

import paho.mqtt.client as mqtt

# 连接参数
broker_url = "a1627280ee.iot-mqtts.cn-north-4.myhuaweicloud.com"
broker_port = 8883
username = "your-username"
password = "your-password"

# 连接回调函数
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    # 订阅主题
    client.subscribe("your-topic")

# 消息接收回调函数
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))

# 创建MQTT客户端
client = mqtt.Client()

# 设置连接参数
client.username_pw_set(username, password)
client.tls_set()

# 设置回调函数
client.on_connect = on_connect
client.on_message = on_message

# 连接到MQTT Broker
client.connect(broker_url, broker_port)

# 循环处理消息
client.loop_forever()

在上述代码中，需要将`broker_url`、`username`和`password`替换为自己的实际值。此外，还需要安装`paho-mqtt`库，可以使用以下命令进行安装：

pip install paho-mqtt