网站后台补丁如何做,中国建设第一平台网站,自己做的网站用在博客上,门户网站建设情况简介文章目录 前言一、平台注册二、引入源码库1.libcoap仓库编译2.分析网络报文3.案例代码4.编译运行 总结 前言
通过libcoap3开源代码库对接华为云平台#xff0c;本文章将讨论加密与不加密的方式对接华为云平台。 一、平台注册
首先#xff0c;你需要在华为云平台上创建… 文章目录 前言一、平台注册二、引入源码库1.libcoap仓库编译2.分析网络报文3.案例代码4.编译运行 总结 前言
通过libcoap3开源代码库对接华为云平台本文章将讨论加密与不加密的方式对接华为云平台。 一、平台注册
首先你需要在华为云平台上创建一个coap协议的设备并制定好数据格式这个自行百度。
二、引入源码库
1.libcoap仓库编译
步骤如下linux环境
#参考https://raw.githubusercontent.com/obgm/libcoap/develop/BUILDING
git clone https://github.com/obgm/libcoap.git
cd libcoap
cd ext
# v0.9-rc1 这个版本的加密库没啥问题其它版本没试
git clone --branch v0.9-rc1 --single-branch https://github.com/eclipse/tinydtls.git
cd ..
#这一步要做不然报错
cp autogen.sh ext/tinydtls/
cmake -E remove_directory build
cmake -E make_directory build
cd build
cmake --build . -- install
cp lib/libtinydtls.so /usr/local/lib/2.分析网络报文 1连接报文 注意这几个选项在下面的案例代码将体现 2服务端资源请求报文 重点关注这个token后面主动上传全靠它 3数据上传报文
3.案例代码 先找到设备标识码 #include threads.h
#include coap3/coap.h#include ctype.h
#include stdio.h#define COAP_CLIENT_URI coap://015f8fcbf7.iot-coaps.cn-north-4.myhuaweicloud.com#define COAP_USE_PSK_ID 561342 //修改这个地方的标识码#define RD_ROOT_STR t/dtypedef unsigned char method_t;
unsigned char msgtype COAP_MESSAGE_NON;
static coap_context_t *main_coap_context NULL;
static int quit 0;
static int is_mcast 0;uint8_t sensor_data[2]{0x00,0x33}; unsigned int wait_seconds 5; /* default timeout in seconds */static unsigned char _token_data[24]{0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38}; /* With support for RFC8974 */
coap_binary_t the_token { 8, _token_data };static void handle_observe_request(coap_resource_t *resource COAP_UNUSED,coap_session_t *session,const coap_pdu_t *request,const coap_string_t *query COAP_UNUSED,coap_pdu_t *response) {unsigned char observe_op0;coap_log_info(handle_observe_request \n);/* 打印服务端的报文信息 */coap_show_pdu(COAP_LOG_INFO, request);coap_pdu_set_code(response, COAP_RESPONSE_CODE_CHANGED);/* 存储服务端发来的token ,后面数据上传需要这个token */coap_bin_const_t token coap_pdu_get_token(request);memcpy(the_token.s,token.s,token.length);the_token.length token.length;coap_add_option(response,COAP_OPTION_OBSERVE,1,observe_op);}static void
free_xmit_data(coap_session_t *session COAP_UNUSED, void *app_ptr) {coap_free(app_ptr);return;
}/* 上报设备信息 */
static int
coap_report(coap_context_t *ctx,coap_session_t *session,method_t m,unsigned char *data,size_t length) {coap_pdu_t *pdu;(void)ctx;coap_log_debug(sending CoAP request\n);if (!(pdu coap_new_pdu(COAP_MESSAGE_NON, m, session))) {free_xmit_data(session, data);return 1;}if (!coap_add_token(pdu, the_token.length,the_token.s)) {coap_log_debug(cannot add token to request\n);}if (!length) {return 1;}coap_add_data( pdu, length, data);if (coap_send(session, pdu) COAP_INVALID_MID) {coap_log_err(cannot send CoAP pdu\n);return 1;}return 0;
}static coap_response_t
message_handler(coap_session_t *session COAP_UNUSED,const coap_pdu_t *sent,const coap_pdu_t *received,const coap_mid_t id COAP_UNUSED) {coap_opt_t *block_opt;coap_opt_iterator_t opt_iter;size_t len;const uint8_t *databuf;size_t offset;size_t total;coap_pdu_code_t rcv_code coap_pdu_get_code(received);coap_pdu_type_t rcv_type coap_pdu_get_type(received);coap_bin_const_t token coap_pdu_get_token(received);coap_string_t *query coap_get_query(received);coap_log_debug(** process incoming %d.%02d response:\n,COAP_RESPONSE_CLASS(rcv_code), rcv_code 0x1F);coap_show_pdu(COAP_LOG_INFO, received);return COAP_RESPONSE_OK;}static void init_resources(coap_context_t * ctx)
{coap_resource_t *r;/* 创建设备资源后面服务器要访问这个资源 */r coap_resource_init(coap_make_str_const(RD_ROOT_STR), 0);/* 绑定get 方法这个是通过抓包发现的 */coap_register_request_handler(r, COAP_REQUEST_GET, handle_observe_request);coap_add_resource(ctx, r);}static int
resolve_address(const char *host, const char *service, coap_address_t *dst,int scheme_hint_bits)
{uint16_t port service ? atoi(service) : 0;int ret 0;coap_str_const_t str_host;coap_addr_info_t *addr_info;str_host.s (const uint8_t *)host;str_host.length strlen(host);addr_info coap_resolve_address_info(str_host, port, port, port, port,AF_UNSPEC, scheme_hint_bits,COAP_RESOLVE_TYPE_REMOTE);if (addr_info){ret 1;*dst addr_info-addr;is_mcast coap_is_mcast(dst);}coap_free_address_info(addr_info);return ret;
}void client_coap_init(void)
{coap_session_t *session NULL;coap_pdu_t *pdu;coap_address_t dst;coap_mid_t mid;int len;coap_uri_t uri;char portbuf[8];char uri_query_op[20]{0};unsigned int wait_ms 0;int result -1;
#define BUFSIZE 100unsigned char buf[BUFSIZE];int res;const char *coap_uri COAP_CLIENT_URI;/* Initialize libcoap library */coap_startup();coap_set_log_level(COAP_MAX_LOGGING_LEVEL);/* Parse the URI */len coap_split_uri((const unsigned char *)coap_uri, strlen(coap_uri), uri);if (len ! 0){coap_log_warn(Failed to parse uri %s\n, coap_uri);goto fail;}snprintf(portbuf, sizeof(portbuf), %d, uri.port);snprintf((char *)buf, sizeof(buf), %*.*s, (int)uri.host.length,(int)uri.host.length, (const char *)uri.host.s);/* resolve destination address where packet should be sent */len resolve_address((const char *)buf, portbuf, dst, 1 uri.scheme);if (len 0){coap_log_warn(Failed to resolve address %*.*s\n, (int)uri.host.length,(int)uri.host.length, (const char *)uri.host.s);goto fail;}main_coap_context coap_new_context(NULL);if (!main_coap_context){coap_log_warn(Failed to initialize context\n);goto fail;}init_resources(main_coap_context);coap_context_set_block_mode(main_coap_context, COAP_BLOCK_USE_LIBCOAP);coap_context_set_keepalive(main_coap_context, 60);session coap_new_client_session(main_coap_context, NULL, dst,COAP_PROTO_UDP);coap_session_init_token(session, the_token.length, the_token.s);coap_register_response_handler(main_coap_context, message_handler);/* construct CoAP message */pdu coap_pdu_init(COAP_MESSAGE_CON,COAP_REQUEST_CODE_POST,coap_new_message_id(session),coap_session_max_pdu_size(session));if (!pdu) {coap_log_warn(Failed to create PDU\n);goto fail;}if (!coap_add_token(pdu, the_token.length, the_token.s)) {coap_log_debug(cannot add token to request\n);}coap_add_option(pdu, COAP_OPTION_URI_PATH, 1, t);coap_add_option(pdu, COAP_OPTION_URI_PATH, 1, r);unsigned char opbuf[40];coap_add_option(pdu, COAP_OPTION_CONTENT_FORMAT,coap_encode_var_safe(opbuf, sizeof(opbuf),COAP_MEDIATYPE_APPLICATION_OCTET_STREAM),opbuf);sprintf(uri_query_op,ep%s,COAP_USE_PSK_ID);coap_add_option(pdu, COAP_OPTION_URI_QUERY, strlen(uri_query_op), uri_query_op);if (is_mcast){wait_seconds coap_session_get_default_leisure(session).integer_part 1;}wait_ms wait_seconds * 1000;/* and send the PDU */mid coap_send(session, pdu);if (mid COAP_INVALID_MID){coap_log_warn(Failed to send PDU\n);goto fail;}while (!quit || is_mcast){result coap_io_process(main_coap_context, 1000);coap_log_info(result %d wait_ms %d\n,result,wait_ms);if (result 0){if (wait_ms 0){if ((unsigned)result wait_ms){//产生一个随机值sensor_data[1] wait_ms/100result-wait_ms;if ( 1 coap_report(main_coap_context, session, COAP_RESPONSE_CODE_CONTENT,sensor_data, 2)) {goto fail;}wait_ms wait_seconds * 1000;}else{wait_ms - result;}}}}
fail:/* Clean up library usage so client can be run again */quit 0;coap_session_release(session);session NULL;coap_free_context(main_coap_context);main_coap_context NULL;coap_cleanup();
}int main()
{client_coap_init(); }
4.编译运行
1编译 gcc -o test_coap_nodtls test_coap_nodtls.c -I/usr/local/include/coap3/ -lcoap-3 -ltinydtls -I/usr/local/include/tinydtls/ 2运行
总结
加密对接的代码就不放出来这个先参考着搞吧。
