stm32f103c8t6连接华为云

为了将STM32F103C8T6连接到华为云，需要进行以下步骤：

1. 首先，需要在华为云物联网平台上创建产品和设备，并获取设备的三元组（Device ID、Device Secret和Product ID）。

2. 接下来，需要在STM32F103C8T6上安装MQTT客户端库，例如Paho MQTT C库。

3. 在STM32F103C8T6上编写代码，使用MQTT客户端库连接到华为云物联网平台，并将设备的三元组用作身份验证凭据。

4. 在STM32F103C8T6上编写代码，将设备的传感器数据或属性数据发布到华为云物联网平台。

下面是一个简单的示例代码，演示如何使用Paho MQTT C库将STM32F103C8T6连接到华为云物联网平台并发布数据：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MQTTClient.h"

#define ADDRESS     "ssl://161a58a78.iot-mqtts.cn-north-4.myhuaweicloud.com:8883"
#define CLIENTID    "your_client_id"
#define USERNAME    "your_device_id&your_product_id"
#define PASSWORD    "your_device_secret"
#define TOPIC       "your_topic"

int main(int argc, char* argv[])
{
    MQTTClient client;
    MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
    MQTTClient_message pubmsg = MQTTClient_message_initializer;
    MQTTClient_deliveryToken token;
    int rc;

    // 连接到MQTT服务器
    MQTTClient_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL);
    conn_opts.username = USERNAME;
    conn_opts.password = PASSWORD;
    conn_opts.keepAliveInterval = 20;
    conn_opts.cleansession = 1;
    if ((rc = MQTTClient_connect(client, &conn_opts)) != MQTTCLIENT_SUCCESS)
    {
        printf("Failed to connect, return code %d\n", rc);
        exit(EXIT_FAILURE);
    }

    // 发布消息
    pubmsg.payload = "Hello, world!";
    pubmsg.payloadlen = strlen(pubmsg.payload);
    pubmsg.qos = 1;
    pubmsg.retained = 0;
    MQTTClient_publishMessage(client, TOPIC, &pubmsg, &token);
    printf("Waiting for publication of %s\n"
           "on topic %s for client with ClientID: %s\n",
           pubmsg.payload, TOPIC, CLIENTID);
    rc = MQTTClient_waitForCompletion(client, token, 10000L);
    printf("Message with delivery token %d delivered\n", token);

    // 断开连接
    MQTTClient_disconnect(client, 10000);
    MQTTClient_destroy(&client);
    return rc;
}