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分类: 项目管理

2013-11-05 14:35:54

前言: 为了防止再次被管理员误当成广告而被删除, 特以2个目前比较著名的网站举例

以下代码都已实验成功, 具体结果可在相关网站查看
http://www.yeelink.net/devices/4420


一.  HTTP请求的数据流总结
#上传数据, yeelink的数据流如下
POST /v1.0/device/4420/sensor/9089/datapoints HTTP/1.1
Host: api.yeelink.net
U-ApiKey: 729d1ba15b26b6a48f4807ef3f2f4df4
Content-Length: 49
Content-Type: application/x-www-form-urlencoded
Connection: Close

{"timestamp":"2013-07-23T06:04:15","value":21.9}


#上传数据, lewer50的数据流如下
POST /api/V1/gateway/UpdateSensors/01 HTTP/1.1
Host:
userkey: 36be8ff22f794f1e8a0bee3336eef237
Content-Length: 31
Content-Type: application/x-www-form-urlencoded
Connection: Close

[{"Name":"T1","Value":"24.02"}]


三. 代码如下, 公用的 http_clound.h

点击(此处)折叠或打开

  1. /*----------------------------------------------------------------------------------------------------
  2. 云端查询: http://www.yeelink.net/devices/4420, http://www.lewei50.com/u/g/2375

  3. #调用例程
  4. float current_temp = 24.02;
  5. yeelink_create_data(YEELINK_DEVICE_ID, YEELINK_SENSOR_ID, current_temp);
  6. lewei50_create_data(LEWEI50_DEVICE_ID, current_temp);

  7. linux下三种方法和云端通讯:
  8. 1. 纯利用linux的网络函数
  9. 2. 利用libcurl的发送和接收函数
  10. 3. 利用libcurl的回调机制

  11. #上传数据, yeelink的字符流如下
  12. POST /v1.0/device/4420/sensor/9089/datapoints HTTP/1.1
  13. Host: api.yeelink.net
  14. U-ApiKey: 729d1ba15b26b6a48f4807ef3f2f4df4
  15. Content-Length: 49
  16. Content-Type: application/x-www-form-urlencoded
  17. Connection: Close

  18. {"timestamp":"2013-07-23T06:04:15","value":21.9}

  19. #上传数据, lewer50的字符流如下
  20. POST /api/V1/gateway/UpdateSensors/01 HTTP/1.1
  21. Host: www.lewei50.com
  22. userkey: 36be8ff22f794f1e8a0bee3336eef237
  23. Content-Length: 31
  24. Content-Type: application/x-www-form-urlencoded
  25. Connection: Close

  26. [{"Name":"T1","Value":"24.02"}]

  27. lewei50 ret = {"Successful":true,"Message":"Warning: T1\u0027s frequency limit is 10s; "}

  28. V1.0 2013-11-5 初步实现了上面三种方法的Demo.
  29.     错误: bfe06000-bfe1b000 rw-p 00000000 00:00 0 [stack], 修改: char pc_ret[200] -> char pc_ret[500]

  30. -----------------------------------------------------------------------------------------------------*/

  31. #ifndef HTTP_CLOUD_H
  32. #define HTTP_CLOUD_H

  33. //有replace的地方换成自己的参数
  34. #define YEELINK (1)    //www.yeelink.net
  35. #define LEWEI50 (1)    //www.lewei50.com

  36. #if (YEELINK == 1)
  37.     #define YEELINK_URL            ""
  38.     #define YEELINK_HOST        "api.yeelink.net"        //网址, 由此获得公网IP
  39.     #define YEELINK_PORT        80
  40.     #define YEELINK_API_KEY "729d1ba15b26b6a48f4807ef3f2f4df4" //replace your yeelink api key here.
  41.     #define YEELINK_DEVICE_ID                4420 //replace your device ID
  42.     #define YEELINK_SENSOR_ID                9089 //replace your sensor ID
  43. #endif

  44. #if (LEWEI50 == 1)
  45.     #define LEWEI50_GATEWAY     01        //网关号
  46.     #define LEWEI50_URL             "http:///api/V1/gateway/UpdateSensors/01"
  47.     #define LEWEI50_HOST            ""        //网址, 由此获得公网IP
  48.     #define LEWEI50_PORT            80
  49.     #define LEWEI50_HOST_FILE    "api/V1/gateway/UpdateSensors/01"
  50.     #define LEWEI50_USER_KEY     "36be8ff22f794f1e8a0bee3336eef237"    //replace your lewei50 key here.
  51.     #define LEWEI50_DEVICE_ID "T1"                                                                //replace your device ID
  52. #endif

  53. #define DATA_CREATE     (0)    //创建数据点
  54. #define DATA_MODIFY     (1)    //修改数据点
  55. #define DATA_QUERY         (2)    //查询数据点

  56. #define HTTP_GET "GET"
  57. #define HTTP_PUT "PUT"
  58. #define HTTP_HEAD "HEAD"
  59. #define HTTP_POST "POST"
  60. #define HTTP_DELETE "DELETE"

  61. #define MAX_SEND_BUFFER_SIZE            (2 * 1024 * 1024)
  62. #define MAX_RECV_BUFFER_SIZE            (2 * 1024 * 1024)
  63. #define MAX_HEADER_BUFFER_SIZE        (128 * 1024)

  64. //http请求与接受的buffer总体结构

  65. //param_buffer_t中buffer的内容
  66. typedef struct {
  67.     char *ptr; /**< 缓冲区首指针 */
  68.     FILE *fp; /**< 文件指针 */
  69.     unsigned int left; /** 缓冲区剩余大小 */
  70.     unsigned int allocated; /** 缓冲区总大小 */
  71.     unsigned short code; /**返回码 */
  72. } param_buffer_t;

  73. typedef struct {
  74.     param_buffer_t *send_buffer; /**< send buffer */
  75.     param_buffer_t *recv_buffer; /**< receive buffer */
  76.     param_buffer_t *header_buffer; /**< header buffer */
  77. } curl_request_param_t;

  78. extern int yeelink_create_data(const int device_id, const int sensor_id, const float device_value);
  79. extern int lewei50_create_data(const char *device_id, const float device_value);

  80. #endif

纯利用linux的网络函数实现的代码如下

点击(此处)折叠或打开

  1. /*----------------------------------------------------------------------------------------------------
  2. 直接利用linux的内部函数实现云端通讯, 另外可以利用libcurl的API.
  3. -----------------------------------------------------------------------------------------------------*/
  4. #include <stdio.h>
  5. #include <stdlib.h>
  6. #include <string.h>
  7. #include <sys/types.h>
  8. #include <sys/socket.h>
  9. #include <errno.h>
  10. #include <unistd.h>
  11. #include <netinet/in.h>
  12. #include <limits.h>
  13. #include <netdb.h>
  14. #include <arpa/inet.h>
  15. #include <ctype.h>
  16. #include <time.h>
  17. #include <assert.h>

  18. #include "../http_cloud.h"

  19. #define DBG printf

  20. //-----------------------------------------------------------------------------------------
  21. static void get_local_time(char *pc_str)
  22. {
  23.     time_t now;
  24.     struct tm *timenow;

  25.     assert(pc_str != NULL);
  26.     time(&now);
  27.     timenow = localtime(&now);
  28.     sprintf(pc_str, "%04d-%02d-%02dT%02d:%02d:%02d", timenow->tm_year+1900, timenow->tm_mon+1, timenow->tm_mday,
  29.                     timenow->tm_hour, timenow->tm_min, timenow->tm_sec);
  30. }

  31. //连接云端: host_addr:网址(如api.yeelink.net), portno:端口号(一般为80), request: 完整的请求
  32. //返回参数: \r\n\r\n之后的数据, 一般为有效数据,{"Successful":true,"Message":"Successful. "}
  33. static char connect_cloud(char *pc_ret, const char *host_addr, const int portno, const char *request)
  34. {
  35.     int sockfd = 0;
  36.     char buffer[1024] = "";
  37.     struct sockaddr_in server_addr;
  38.     struct hostent *host;
  39.     //int portno = 80;    //默认端口
  40.     int nbytes = 0;
  41.     //char host_addr[256] = "";
  42.     //char host_file[1024] = "";
  43.     char pc_tmp[1024] = "";
  44.     int send = 0, totalsend = 0;
  45.     int i = 0, iLen = 0, iRet = 0, iPos = 0, mark_num;

  46.     assert((pc_ret != NULL) && (host_addr != NULL) && (request != NULL));

  47.     //由host_addr取得主机IP地址
  48.   if((host = gethostbyname(host_addr)) == NULL) {
  49.       fprintf(stderr, "Gethostname error, %s\n ", strerror(errno));
  50.       exit(1);
  51.   }

  52.   //客户程序开始建立sockfd描述符,建立SOCKET连接
  53.   if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
  54.       fprintf(stderr, "Socket Error:%s\a\n ",strerror(errno));
  55.       exit(1);
  56.   }

  57.   //客户程序填充服务端的资料
  58.   bzero(&server_addr, sizeof(server_addr));
  59.   server_addr.sin_family = AF_INET;
  60.   server_addr.sin_port = htons(portno);
  61.   server_addr.sin_addr = *((struct in_addr*)host->h_addr);
  62.   //DBG("server_addr.sin_addr = %08X\n", server_addr.sin_addr);    //server_addr.sin_addr = CB3888CA

  63.   //客户程序发起连接请求, 连接网站
  64.   if(connect(sockfd, (struct sockaddr*)(&server_addr), sizeof(struct sockaddr)) == -1) {
  65.       fprintf(stderr, "Connect Error:%s\a\n ",strerror(errno));
  66.       exit(1);
  67.   }

  68.   //发送http请求request
  69.   send = 0;
  70.     totalsend = 0;
  71.   nbytes = strlen(request);
  72.   while(totalsend < nbytes)
  73.   {
  74.     send = write(sockfd, request+totalsend, nbytes-totalsend);
  75.     if(send == -1) {
  76.             DBG( "send error!%s\n ", strerror(errno));
  77.             exit(0);
  78.         }
  79.     totalsend += send;
  80.     //DBG("%d bytes send OK!\n ", totalsend);
  81.   }

  82.   //DBG( "\nThe following is the response header:\n");
  83.   i = 0;
  84.   mark_num = 4;        //正常=4,
  85.   //连接成功了,接收http响应
  86.   while((nbytes = read(sockfd, buffer, 1)) == 1)
  87.   {
  88.     //DBG("%c", buffer[0]);
  89.     if(i < mark_num) {
  90.         if(buffer[0] == '\r' || buffer[0] == '\n') {
  91.                 i++;
  92.                 //DBG("i = %d, ", i);

  93.                 if (iRet == 0) {
  94.                     pc_tmp[iPos] = '\0';
  95.                     if (!strcmp(pc_tmp, "HTTP/1.1 200 OK")) {
  96.                         iRet = 1;
  97.                     }
  98.                 }
  99.             }
  100.       else {
  101.                 i = 0;    //新行重新计数
  102.                 pc_tmp[iPos++] = buffer[0];
  103.             }
  104.     }
  105.     else {
  106.         pc_ret[iLen++] = buffer[0];    //获取有效数据
  107.     }
  108.   }
  109.   close(sockfd);

  110.   pc_ret[iLen] = '\0';
  111.   DBG("\nret(%d): %s\n", iLen, pc_ret);
  112.   return(iRet);
  113. }

  114. #if (YEELINK == 1)
  115. int yeelink_create_data(const int device_id, const int sensor_id, const float device_value)
  116. {
  117.     char pc_ret[200], request[1024], pc_json[100], pc_time[30], pc_host_file[100], pc_header[100], ret;
  118.     int len;

  119.     sprintf(pc_host_file, "v1.0/device/%d/sensor/%d/datapoints", device_id, sensor_id);
  120.     sprintf(pc_header, "U-ApiKey: %s", YEELINK_API_KEY);

  121.     get_local_time(pc_time);
  122.     sprintf(pc_json, "{\"timestamp\":\"%s\",\"value\":%.2f}", pc_time, device_value);
  123.     len = strlen(pc_json);

  124.     sprintf(request, "POST /%s HTTP/1.1\r\nHost: %s\r\nAccept: */*\r\n%s\r\nContent-Length: %d\r\nContent-Type: application/x-www-form-urlencoded\r\nConnection: Close\r\n\r\n%s\r\n",
  125.         pc_host_file, YEELINK_HOST, pc_header, len, pc_json);
  126.     DBG("request = %s\n", request);

  127.     ret = connect_cloud(pc_ret, YEELINK_HOST, YEELINK_PORT, request);

  128.     return(ret);
  129. }
  130. #endif

  131. #if (LEWEI50 == 1)
  132. //curl --request POST http://www.lewei50.com/api/V1/Gateway/UpdateSensors/01 --data "[{\"Name\":\"T1\",\"Value\":\"23.08\"}]" --header "userkey:36be8ff22f794f1e8a0bee3336eef237"
  133. int lewei50_create_data(const char *device_id, const float device_value)
  134. {
  135.     char pc_ret[200], request[1024], pc_json[100], pc_header[100], ret;
  136.     int len;

  137.     assert(device_id != NULL);

  138.     sprintf(pc_header, "userkey: %s", LEWEI50_USER_KEY);
  139.     sprintf(pc_json, "[{\"Name\":\"%s\",\"Value\":\"%.2f\"}]", device_id, device_value);
  140.     len = strlen(pc_json);

  141.     sprintf(request, "POST /%s HTTP/1.1\r\nHost: %s\r\nAccept: */*\r\n%s\r\nContent-Length: %d\r\nContent-Type: application/x-www-form-urlencoded\r\nConnection: Close\r\n\r\n%s\r\n",
  142.         LEWEI50_HOST_FILE, LEWEI50_HOST, pc_header, len, pc_json);
  143.     DBG("request = %s\n", request);

  144.     ret = connect_cloud(pc_ret, LEWEI50_HOST, LEWEI50_PORT, request);

  145.     return(ret);
  146. }
  147. #endif

  148. //-------------------------------------------------------------------
  149. int main(void)
  150. {
  151.     float f_value = 15.02;
  152.     int i_tmp;

  153.     time_t t;
  154.   srand((unsigned)time(&t));    //初始化随机种子, 否则随机数不随机

  155.     i_tmp = rand();
  156.     i_tmp -= (i_tmp >> 4 << 4);
  157.   f_value += i_tmp;

  158. #if (YEELINK == 1)
  159.     yeelink_create_data(YEELINK_DEVICE_ID, YEELINK_SENSOR_ID, f_value);
  160. #endif

  161. #if (LEWEI50 == 1)
  162.     lewei50_create_data(LEWEI50_DEVICE_ID, f_value);
  163. #endif

  164.     return 1;
  165. }
四. 编译, Makefile如下,
OPENWRT = 0 时目标文件运行下ubuntu下了. 

点击(此处)折叠或打开

  1. OPENWRT = 1

  2. ifeq ($(OPENWRT), 1)
  3.     CC = ~/OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/bin/mips-openwrt-linux-gcc
  4.     CFLAGS += -I ~/openwrt-lib/include -L ~/openwrt-lib/lib

  5. else
  6.     CC = gcc
  7. endif

  8. CFLAGS += -Wall -O2
  9. #CFLAGS += -g

  10. #可执行文件名和相关的obj文件
  11. APP_BINARY = http_cloud
  12. SRCS += http_cloud.c
  13. OBJS = $(SRCS:.c=.o)

  14. all: APP_FILE

  15. APP_FILE: $(OBJS)
  16.     $(CC) $(CFLAGS) $(OBJS) -o $(APP_BINARY) $(LFLAGS)

  17. .PHONY: clean
  18. clean:
  19.     @echo "cleanning project"
  20.     $(RM) *.a $(OBJS) *~ *.so *.lo $(APP_BINARY)
  21.     @echo "clean completed"
编译过程:
xxg@xxg-desktop:~/1-wire/http_cloud/linux_only$ make
gcc -Wall -O2   -c -o http_cloud.o http_cloud.c
gcc -Wall -O2 http_cloud.o -o http_cloud 


运行结果:
xxg@xxg-desktop:~/1-wire/http_cloud/linux_only$ ./http_cloud
request = POST /v1.0/device/4420/sensor/9089/datapoints HTTP/1.1
Host: api.yeelink.net
Accept: */*
U-ApiKey: 729d1ba15b26b6a48f4807ef3f2f4df4
Content-Length: 49
Content-Type: application/x-www-form-urlencoded
Connection: Close

{"timestamp":"2013-11-05T14:32:48","value":16.02}

ret(5): 0


request = POST /api/V1/gateway/UpdateSensors/01 HTTP/1.1
Host:
Accept: */*
userkey: 36be8ff22f794f1e8a0bee3336eef237
Content-Length: 31
Content-Type: application/x-www-form-urlencoded
Connection: Close

[{"Name":"T1","Value":"16.02"}]

ret(44): {"Successful":true,"Message":"Successful. "}
xxg@xxg-desktop:~/1-wire/http_cloud/linux_only$ 


这个只是第一部分的实验, 后续的还有利用libcurl库的实现代码.  

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