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 = 0;
   char buffer[15] = { };
   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
", tf/1000);

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

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

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



int   main(int argc,char *argv[])
{
   int s ;
   struct sockaddr_in addr ;
    char mybuffer[256];
        char *str1="POST /v1.0/device/19374/sensor/33945/datapoints HTTP/1.0
Host: api.yeelink.net
Accept: */*
";
        char *str2="U-ApiKey: 108968b03a7e9334b2aca7c45b199dee
Content-Length: 15
Content-type: application/json;charset=utf-8
"; //
 //                             此处的Content-Length: 15是决定改善的数据的长度 = strlen("values":33.35) = 15 
        char *str3="
";
        char *str10;
        printf("GetCpuTemp() = %2.2f
",GetCpuTemp());

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

   if( (s=socket(AF_INET,SOCK_STREAM,0))<0 )  //IPV4 TCP
   {
      perror("socket");
      exit(1);
   }
   else
   {
        printf("socket created .
");
        printf("socked id: %d 
",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))<0)
   {
      perror("connect");
      exit(1);
   }
   else
   {
           printf("connected ok!
");
           printf("remote ip:%s
",REMOTE_IP);
           printf("remote port:%d
",PORT);
    }

        bzero(mybuffer,sizeof(mybuffer));

//send http request
        printf("tcp send start!--");
   if(send(s,str1,strlen(str1),0)<0)
      {
         perror("send");
         exit(1);
      }
   if(send(s,str2,strlen(str2),0)<0)
      {
         perror("send");
         exit(1);
      }
   if(send(s,str3,strlen(str3),0)<0)
      {
         perror("send");
         exit(1);
      }
//body
   if(send(s,str10,strlen(str10),0)<0)
      {
         perror("send");
         exit(1);
      }

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

   recv(s ,mybuffer,sizeof(mybuffer),0);
   printf("%s
",mybuffer);
   printf("enter os");

   while(1 )
   {
         bzero(mybuffer,sizeof(mybuffer));
         recv(s ,mybuffer,sizeof(mybuffer),0);
       //  printf("received:%s
",mybuffer);
         if (strlen(mybuffer) == 0 ){    // if strlen(mybuffer) == 0, exit the loop
           return 0;
        }
    }
    return 0;
}

 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：