(转)linux下和云端通讯的例程, ubuntu和openwrt实验成功(一)

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: www.lewei50.com
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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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            "http://api.yeelink.net"
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://www.lewei50.com/api/V1/gateway/UpdateSensors/01"
47. #define LEWEI50_HOST            "www.lewei50.com"        //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

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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, 如{"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.

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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: www.lewei50.com
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$

 

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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.