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
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/*----------------------------------------------------------------------------------------------------
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云端查询: http://www.yeelink.net/devices/4420, http://www.lewei50.com/u/g/2375
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#调用例程
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float current_temp = 24.02;
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yeelink_create_data(YEELINK_DEVICE_ID, YEELINK_SENSOR_ID, current_temp);
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lewei50_create_data(LEWEI50_DEVICE_ID, current_temp);
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linux下三种方法和云端通讯:
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1. 纯利用linux的网络函数
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2. 利用libcurl的发送和接收函数
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3. 利用libcurl的回调机制
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#上传数据, yeelink的字符流如下
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POST /v1.0/device/4420/sensor/9089/datapoints HTTP/1.1
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Host: api.yeelink.net
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U-ApiKey: 729d1ba15b26b6a48f4807ef3f2f4df4
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Content-Length: 49
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Content-Type: application/x-www-form-urlencoded
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Connection: Close
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{"timestamp":"2013-07-23T06:04:15","value":21.9}
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#上传数据, lewer50的字符流如下
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POST /api/V1/gateway/UpdateSensors/01 HTTP/1.1
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Host: www.lewei50.com
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userkey: 36be8ff22f794f1e8a0bee3336eef237
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Content-Length: 31
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Content-Type: application/x-www-form-urlencoded
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Connection: Close
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[{"Name":"T1","Value":"24.02"}]
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lewei50 ret = {"Successful":true,"Message":"Warning: T1\u0027s frequency limit is 10s; "}
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V1.0 2013-11-5 初步实现了上面三种方法的Demo.
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错误: bfe06000-bfe1b000 rw-p 00000000 00:00 0 [stack], 修改: char pc_ret[200] -> char pc_ret[500]
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-----------------------------------------------------------------------------------------------------*/
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#ifndef HTTP_CLOUD_H
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#define HTTP_CLOUD_H
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//有replace的地方换成自己的参数
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#define YEELINK (1) //www.yeelink.net
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#define LEWEI50 (1) //www.lewei50.com
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#if (YEELINK == 1)
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#define YEELINK_URL ""
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#define YEELINK_HOST "api.yeelink.net" //网址, 由此获得公网IP
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#define YEELINK_PORT 80
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#define YEELINK_API_KEY "729d1ba15b26b6a48f4807ef3f2f4df4" //replace your yeelink api key here.
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#define YEELINK_DEVICE_ID 4420 //replace your device ID
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#define YEELINK_SENSOR_ID 9089 //replace your sensor ID
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#endif
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#if (LEWEI50 == 1)
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#define LEWEI50_GATEWAY 01 //网关号
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#define LEWEI50_URL "http:///api/V1/gateway/UpdateSensors/01"
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#define LEWEI50_HOST "" //网址, 由此获得公网IP
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#define LEWEI50_PORT 80
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#define LEWEI50_HOST_FILE "api/V1/gateway/UpdateSensors/01"
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#define LEWEI50_USER_KEY "36be8ff22f794f1e8a0bee3336eef237" //replace your lewei50 key here.
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#define LEWEI50_DEVICE_ID "T1" //replace your device ID
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#endif
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#define DATA_CREATE (0) //创建数据点
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#define DATA_MODIFY (1) //修改数据点
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#define DATA_QUERY (2) //查询数据点
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#define HTTP_GET "GET"
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#define HTTP_PUT "PUT"
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#define HTTP_HEAD "HEAD"
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#define HTTP_POST "POST"
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#define HTTP_DELETE "DELETE"
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#define MAX_SEND_BUFFER_SIZE (2 * 1024 * 1024)
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#define MAX_RECV_BUFFER_SIZE (2 * 1024 * 1024)
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#define MAX_HEADER_BUFFER_SIZE (128 * 1024)
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//http请求与接受的buffer总体结构
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//param_buffer_t中buffer的内容
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typedef struct {
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char *ptr; /**< 缓冲区首指针 */
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FILE *fp; /**< 文件指针 */
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unsigned int left; /** 缓冲区剩余大小 */
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unsigned int allocated; /** 缓冲区总大小 */
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unsigned short code; /**返回码 */
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} param_buffer_t;
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typedef struct {
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param_buffer_t *send_buffer; /**< send buffer */
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param_buffer_t *recv_buffer; /**< receive buffer */
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param_buffer_t *header_buffer; /**< header buffer */
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} curl_request_param_t;
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extern int yeelink_create_data(const int device_id, const int sensor_id, const float device_value);
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extern int lewei50_create_data(const char *device_id, const float device_value);
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#endif
纯利用linux的网络函数实现的代码如下
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/*----------------------------------------------------------------------------------------------------
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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.
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-----------------------------------------------------------------------------------------------------*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <limits.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <time.h>
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#include <assert.h>
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#include "../http_cloud.h"
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#define DBG printf
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//-----------------------------------------------------------------------------------------
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static void get_local_time(char *pc_str)
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{
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time_t now;
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struct tm *timenow;
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assert(pc_str != NULL);
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time(&now);
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timenow = localtime(&now);
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sprintf(pc_str, "%04d-%02d-%02dT%02d:%02d:%02d", timenow->tm_year+1900, timenow->tm_mon+1, timenow->tm_mday,
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timenow->tm_hour, timenow->tm_min, timenow->tm_sec);
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}
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//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
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//返回参数: \r\n\r\n之后的数据, 一般为有效数据, 如{"Successful":true,"Message":"Successful. "}
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static char connect_cloud(char *pc_ret, const char *host_addr, const int portno, const char *request)
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{
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int sockfd = 0;
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char buffer[1024] = "";
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struct sockaddr_in server_addr;
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struct hostent *host;
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//int portno = 80; //默认端口
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int nbytes = 0;
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//char host_addr[256] = "";
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//char host_file[1024] = "";
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char pc_tmp[1024] = "";
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int send = 0, totalsend = 0;
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int i = 0, iLen = 0, iRet = 0, iPos = 0, mark_num;
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assert((pc_ret != NULL) && (host_addr != NULL) && (request != NULL));
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//由host_addr取得主机IP地址
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if((host = gethostbyname(host_addr)) == NULL) {
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fprintf(stderr, "Gethostname error, %s\n ", strerror(errno));
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exit(1);
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}
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//客户程序开始建立sockfd描述符,建立SOCKET连接
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if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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fprintf(stderr, "Socket Error:%s\a\n ",strerror(errno));
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exit(1);
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}
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//客户程序填充服务端的资料
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(portno);
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server_addr.sin_addr = *((struct in_addr*)host->h_addr);
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//DBG("server_addr.sin_addr = %08X\n", server_addr.sin_addr); //server_addr.sin_addr = CB3888CA
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//客户程序发起连接请求, 连接网站
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if(connect(sockfd, (struct sockaddr*)(&server_addr), sizeof(struct sockaddr)) == -1) {
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fprintf(stderr, "Connect Error:%s\a\n ",strerror(errno));
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exit(1);
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}
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//发送http请求request
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send = 0;
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totalsend = 0;
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nbytes = strlen(request);
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while(totalsend < nbytes)
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{
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send = write(sockfd, request+totalsend, nbytes-totalsend);
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if(send == -1) {
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DBG( "send error!%s\n ", strerror(errno));
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exit(0);
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}
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totalsend += send;
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//DBG("%d bytes send OK!\n ", totalsend);
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}
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//DBG( "\nThe following is the response header:\n");
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i = 0;
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mark_num = 4; //正常=4,
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//连接成功了,接收http响应
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while((nbytes = read(sockfd, buffer, 1)) == 1)
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{
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//DBG("%c", buffer[0]);
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if(i < mark_num) {
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if(buffer[0] == '\r' || buffer[0] == '\n') {
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i++;
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//DBG("i = %d, ", i);
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if (iRet == 0) {
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pc_tmp[iPos] = '\0';
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if (!strcmp(pc_tmp, "HTTP/1.1 200 OK")) {
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iRet = 1;
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}
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}
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}
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else {
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i = 0; //新行重新计数
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pc_tmp[iPos++] = buffer[0];
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}
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}
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else {
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pc_ret[iLen++] = buffer[0]; //获取有效数据
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}
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}
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close(sockfd);
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pc_ret[iLen] = '\0';
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DBG("\nret(%d): %s\n", iLen, pc_ret);
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return(iRet);
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}
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#if (YEELINK == 1)
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int yeelink_create_data(const int device_id, const int sensor_id, const float device_value)
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{
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char pc_ret[200], request[1024], pc_json[100], pc_time[30], pc_host_file[100], pc_header[100], ret;
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int len;
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sprintf(pc_host_file, "v1.0/device/%d/sensor/%d/datapoints", device_id, sensor_id);
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sprintf(pc_header, "U-ApiKey: %s", YEELINK_API_KEY);
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get_local_time(pc_time);
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sprintf(pc_json, "{\"timestamp\":\"%s\",\"value\":%.2f}", pc_time, device_value);
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len = strlen(pc_json);
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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",
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pc_host_file, YEELINK_HOST, pc_header, len, pc_json);
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DBG("request = %s\n", request);
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ret = connect_cloud(pc_ret, YEELINK_HOST, YEELINK_PORT, request);
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return(ret);
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}
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#endif
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#if (LEWEI50 == 1)
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//curl --request POST http://www.lewei50.com/api/V1/Gateway/UpdateSensors/01 --data "[{\"Name\":\"T1\",\"Value\":\"23.08\"}]" --header "userkey:36be8ff22f794f1e8a0bee3336eef237"
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int lewei50_create_data(const char *device_id, const float device_value)
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{
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char pc_ret[200], request[1024], pc_json[100], pc_header[100], ret;
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int len;
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assert(device_id != NULL);
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sprintf(pc_header, "userkey: %s", LEWEI50_USER_KEY);
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sprintf(pc_json, "[{\"Name\":\"%s\",\"Value\":\"%.2f\"}]", device_id, device_value);
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len = strlen(pc_json);
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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",
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LEWEI50_HOST_FILE, LEWEI50_HOST, pc_header, len, pc_json);
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DBG("request = %s\n", request);
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ret = connect_cloud(pc_ret, LEWEI50_HOST, LEWEI50_PORT, request);
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return(ret);
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}
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#endif
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//-------------------------------------------------------------------
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int main(void)
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{
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float f_value = 15.02;
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int i_tmp;
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time_t t;
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srand((unsigned)time(&t)); //初始化随机种子, 否则随机数不随机
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i_tmp = rand();
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i_tmp -= (i_tmp >> 4 << 4);
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f_value += i_tmp;
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#if (YEELINK == 1)
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yeelink_create_data(YEELINK_DEVICE_ID, YEELINK_SENSOR_ID, f_value);
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#endif
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#if (LEWEI50 == 1)
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lewei50_create_data(LEWEI50_DEVICE_ID, f_value);
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#endif
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return 1;
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}
四. 编译, Makefile如下,
OPENWRT = 0 时目标文件运行下ubuntu下了.
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OPENWRT = 1
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ifeq ($(OPENWRT), 1)
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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
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CFLAGS += -I ~/openwrt-lib/include -L ~/openwrt-lib/lib
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else
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CC = gcc
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endif
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CFLAGS += -Wall -O2
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#CFLAGS += -g
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#可执行文件名和相关的obj文件
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APP_BINARY = http_cloud
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SRCS += http_cloud.c
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OBJS = $(SRCS:.c=.o)
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all: APP_FILE
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APP_FILE: $(OBJS)
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$(CC) $(CFLAGS) $(OBJS) -o $(APP_BINARY) $(LFLAGS)
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.PHONY: clean
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clean:
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@echo "cleanning project"
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$(RM) *.a $(OBJS) *~ *.so *.lo $(APP_BINARY)
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@echo "clean completed"
编译过程:
xxg@xxg-desktop:~/1-wire/http_cloud/linux_only$ 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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