linux 下上传 datapoint数据到yeelink 修改版本

 /*client.c*/
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #define PORT 80
 #define REMOTE_IP "42.96.164.52" //api.yeelink.net = 42.96.164.52

 //#define PORT 4321
 //#define REMOTE_IP "192.168.1.104"

 // int GetCpuTemp() {
 //char *GetCpuTemp() {
 float GetCpuTemp() {

     int fd, size;
     int temp = ;
    char buffer[] = { };
    fd = open("/sys/class/thermal/thermal_zone0/temp", O_RDONLY);
    size = read(fd,buffer, sizeof(buffer));
    close(fd);
     int tmp;
   // strcpy(tmp,buffer);

    temp = atoi(buffer);
    float tf = atof(buffer);
    printf("float temp = %2.2f\n", tf/);

   // printf("temp = %d\n",temp / 1000);

   // sprintf(tmp,"%d",temp / 1000);
   // printf(" temp1 =%s\n",tmp);
   // printf(" temp2 = %s\n",buffer);

   // return (temp/1000) ;
      return (tf/);
 }

 int   main(int argc,char *argv[])
 {
    int s ;
    struct sockaddr_in addr ;
     char mybuffer[];
         char *str1="POST /v1.0/device/19374/sensor/33945/datapoints HTTP/1.0\r\nHost: api.yeelink.net\r\nAccept: */*\r\n";
         char *str2="U-ApiKey: 108968b03a7e9334b2aca7c45b199dee\r\nContent-Length: 15\r\nContent-type: application/json;charset=utf-8\r\n"; //
 //                             此处的Content-Length: 15是决定改善的数据的长度 = strlen("values":33.35) = 15
         char *str3="\r\n";
         char *str10;
         printf("GetCpuTemp() = %2.2f\n",GetCpuTemp());

        sprintf(str10,"{\"value\":%2.2f}\r\n",GetCpuTemp());
      //    str10 = "{\"value\":33.0}\r\n";
        printf("str10 = %s\n", str10);
    //    char *str10="{\"value\":14}\r\n";
    //  printf("str10 = %s\n",str10);

    if( (s=socket(AF_INET,SOCK_STREAM,))< )  //IPV4 TCP
    {
       perror("socket");
       exit();
    }
    else
    {
         printf("socket created .\n");
         printf("socked id: %d \n",s);
         }

    bzero(&addr,sizeof(addr));
    addr.sin_family =AF_INET;  //IPV4
    addr.sin_port=htons(PORT); //SERVER PORT
    addr.sin_addr.s_addr=inet_addr(REMOTE_IP);  //SERVER IP

    if(connect(s,(struct sockaddr *)&addr,sizeof(addr))<)
    {
       perror("connect");
       exit();
    }
    else
    {
            printf("connected ok!\n");
            printf("remote ip:%s\n",REMOTE_IP);
            printf("remote port:%d\n",PORT);
     }

         bzero(mybuffer,sizeof(mybuffer));

 //send http request
         printf("tcp send start!--");
    if(send(s,str1,strlen(str1),)<)
       {
          perror("send");
          exit();
       }
    if(send(s,str2,strlen(str2),)<)
       {
          perror("send");
          exit();
       }
    if(send(s,str3,strlen(str3),)<)
       {
          perror("send");
          exit();
       }
 //body
    if(send(s,str10,strlen(str10),)<)
       {
          perror("send");
          exit();
       }

    printf("tcp send ok!--");

    recv(s ,mybuffer,sizeof(mybuffer),);
    printf("%s\n",mybuffer);
    printf("enter os");

    while( )
    {
          bzero(mybuffer,sizeof(mybuffer));
          recv(s ,mybuffer,sizeof(mybuffer),);
        //  printf("received:%s\n",mybuffer);
          if (strlen(mybuffer) ==  ){    // if strlen(mybuffer) == 0, exit the loop
            return ;
         }
     }
     return ;
 }

修改传递数据的数值参考自：http://home.eeworld.com.cn/my/space-uid-487728-blogid-236541.html

编译方法

gcc -o upload_cpu_temp client.c

./upload_cpu_temp

运行效果如下图：

上传float数值到yeelink

yeelink 上的展示数据如下图：