通过vc或者w5300给yeelink发送温度值，显示曲线

程序代码如下

static char http_request[500]= {0};
BYTE yeelink_post(const char *device_id,const char *sensors_id,float value)
{
        char remote_server[]="api.yeelink.net";
        char str_tmp[128] = {0};
        // Http内容，表单内容
        char http_content[32] = {0};
        sprintf(str_tmp,"/v1.0/device/%s/sensor/%s/datapoints",device_id,sensors_id);
        // 确定HTTP表单提交内容 {"value":20}
        sprintf( http_content , "{\"value\":%3.1f}" , value);
        // 确定 HTTP请求首部
        // 例如POST /v1.0/device/98d19569e0474e9abf6f075b8b5876b9/1/1/datapoints/add HTTP/1.1\r\n
        sprintf( http_request , "POST %s HTTP/1.1\r\n",str_tmp);
        // 增加属性 例如 Host: api.machtalk.net\r\n
        sprintf( str_tmp , "Host:%s\r\n" , remote_server);
        strcat( http_request , str_tmp);

        // 增加密码 例如 APIKey: "9908e3876669432610e9a3ac2fb07490"
        sprintf( str_tmp , "U-ApiKey:%s\r\n" , "9908e3876669432610e9a3ac2fb07490");//需要替换为自己的APIKey
        strcat( http_request , str_tmp);
        //
        strcat( http_request , "Accept: */*\r\n");
        // 增加提交表单内容的长度 例如 Content-Length:12\r\n
        sprintf( str_tmp , "Content-Length:%d\r\n" ,strlen(http_content) );
        strcat( http_request , str_tmp);
        // 增加表单编码格式 Content-Type:application/x-www-form-urlencoded\r\n
        strcat( http_request , "Content-Type: application/x-www-form-urlencoded\r\n");
        strcat( http_request , "Connection: close\r\n");
        // HTTP首部和HTTP内容 分隔部分
        strcat( http_request , "\r\n");
        // HTTP负载内容
        strcat( http_request , http_content);
        return 0;
}
void CVc_tcpclientDlg::OnButtonSend2()
{
    yeelink_post("15983","27668",(float)39.9);
    printf("%s",http_request);
//    send(m_socket,http_request,strlen(http_request),0);
}

测试通过