hi3861开发板通过mqtt协议接入华为云平台并上传数据的C 语言代码

您好！以下是一个使用C语言编写的示例代码，用于将Hi3861开发板通过MQTT协议接入华为云平台并上传数据。

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

#define MQTT_BROKER_URL "ssl://iot-mqtts.cn-north-4.myhuaweicloud.com:8883"
#define MQTT_CLIENT_ID "your_client_id"
#define MQTT_USERNAME "your_username"
#define MQTT_PASSWORD "your_password"
#define MQTT_TOPIC "your_topic"

void messageArrived(MessageData *data)
{
    printf("Message arrived: %.*s\n", data->message->payloadlen, (char *)data->message->payload);
}

int main()
{
    Network network;
    MQTTClient client;
    MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
    int rc;

    // 初始化网络连接
    NetworkInit(&network);

    // 初始化MQTT客户端
    MQTTClientInit(&client, &network, 30000, NULL, 0);

    // 设置MQTT客户端连接选项
    conn_opts.username = MQTT_USERNAME;
    conn_opts.password = MQTT_PASSWORD;
    conn_opts.keepAliveInterval = 60;
    conn_opts.cleansession = 1;

    // 连接到MQTT代理服务器
    if ((rc = MQTTClientConnect(&client, &conn_opts)) != 0)
    {
        printf("Failed to connect to MQTT broker, return code: %d\n", rc);
        exit(EXIT_FAILURE);
    }

    // 订阅指定主题
    if ((rc = MQTTClientSubscribe(&client, MQTT_TOPIC, QOS0, messageArrived)) != 0)
    {
        printf("Failed to subscribe to MQTT topic, return code: %d\n", rc);
        exit(EXIT_FAILURE);
    }

    // 循环等待消息
    while (1)
    {
        MQTTClient_yield();
        sleep(1);
    }

    // 断开MQTT连接
    MQTTClientDisconnect(&client);
    MQTTClientDestroy(&client);

    return 0;
}

请注意，您需要将代码中的 "your_client_id"、"your_username"、"your_password" 和 "your_topic" 替换为您在华为云平台上的实际信息。此外，您还需要在编译和运行代码之前安装MQTTClient库。

希望对您有所帮助！如果您还有其他问题，请随时提问。