mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
examples/gcoap: split client and server implementation
Move client and server side implementations into separate files to increase readability. Also get rid of a goto.
This commit is contained in:
parent
3c5c351ef5
commit
6dcb32d7b3
@ -23,92 +23,32 @@
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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 "fmt.h"
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#include "net/gcoap.h"
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#include "net/utils.h"
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#include "od.h"
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#include "fmt.h"
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#include "gcoap_example.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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#if IS_USED(MODULE_GCOAP_DTLS)
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#include "net/credman.h"
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#include "net/dsm.h"
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#include "tinydtls_keys.h"
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/* Example credential tag for credman. Tag together with the credential type needs to be unique. */
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#define GCOAP_DTLS_CREDENTIAL_TAG 10
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static const uint8_t psk_id_0[] = PSK_DEFAULT_IDENTITY;
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static const uint8_t psk_key_0[] = PSK_DEFAULT_KEY;
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static const credman_credential_t credential = {
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.type = CREDMAN_TYPE_PSK,
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.tag = GCOAP_DTLS_CREDENTIAL_TAG,
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.params = {
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.psk = {
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.key = { .s = psk_key_0, .len = sizeof(psk_key_0) - 1, },
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.id = { .s = psk_id_0, .len = sizeof(psk_id_0) - 1, },
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}
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},
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};
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#endif
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static bool _proxied = false;
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static sock_udp_ep_t _proxy_remote;
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static char proxy_uri[64];
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static ssize_t _encode_link(const coap_resource_t *resource, char *buf,
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size_t maxlen, coap_link_encoder_ctx_t *context);
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static void _resp_handler(const gcoap_request_memo_t *memo, coap_pkt_t* pdu,
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const sock_udp_ep_t *remote);
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static ssize_t _stats_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx);
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static ssize_t _riot_board_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx);
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/* CoAP resources. Must be sorted by path (ASCII order). */
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static const coap_resource_t _resources[] = {
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{ "/cli/stats", COAP_GET | COAP_PUT, _stats_handler, NULL },
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{ "/riot/board", COAP_GET, _riot_board_handler, NULL },
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};
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static const char *_link_params[] = {
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";ct=0;rt=\"count\";obs",
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NULL
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};
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static gcoap_listener_t _listener = {
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&_resources[0],
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ARRAY_SIZE(_resources),
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_encode_link,
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NULL,
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NULL
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};
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/* Retain request path to re-request if response includes block. User must not
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* start a new request (with a new path) until any blockwise transfer
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* completes or times out. */
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#define _LAST_REQ_PATH_MAX (64)
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static char _last_req_path[_LAST_REQ_PATH_MAX];
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/* Counts requests sent by CLI. */
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static uint16_t req_count = 0;
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/* Adds link format params to resource list */
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static ssize_t _encode_link(const coap_resource_t *resource, char *buf,
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size_t maxlen, coap_link_encoder_ctx_t *context) {
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ssize_t res = gcoap_encode_link(resource, buf, maxlen, context);
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if (res > 0) {
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if (_link_params[context->link_pos]
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&& (strlen(_link_params[context->link_pos]) < (maxlen - res))) {
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if (buf) {
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memcpy(buf+res, _link_params[context->link_pos],
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strlen(_link_params[context->link_pos]));
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}
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return res + strlen(_link_params[context->link_pos]);
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}
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}
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return res;
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}
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uint16_t req_count = 0;
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/*
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* Response callback.
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@ -201,66 +141,6 @@ static void _resp_handler(const gcoap_request_memo_t *memo, coap_pkt_t* pdu,
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}
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}
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/*
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* Server callback for /cli/stats. Accepts either a GET or a PUT.
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*
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* GET: Returns the count of packets sent by the CLI.
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* PUT: Updates the count of packets. Rejects an obviously bad request, but
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* allows any two byte value for example purposes. Semantically, the only
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* valid action is to set the value to 0.
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*/
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static ssize_t _stats_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx)
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{
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(void)ctx;
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/* read coap method type in packet */
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unsigned method_flag = coap_method2flag(coap_get_code_detail(pdu));
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switch (method_flag) {
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case COAP_GET:
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gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
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coap_opt_add_format(pdu, COAP_FORMAT_TEXT);
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size_t resp_len = coap_opt_finish(pdu, COAP_OPT_FINISH_PAYLOAD);
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/* write the response buffer with the request count value */
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resp_len += fmt_u16_dec((char *)pdu->payload, req_count);
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return resp_len;
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case COAP_PUT:
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/* convert the payload to an integer and update the internal
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value */
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if (pdu->payload_len <= 5) {
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char payload[6] = { 0 };
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memcpy(payload, (char *)pdu->payload, pdu->payload_len);
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req_count = (uint16_t)strtoul(payload, NULL, 10);
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return gcoap_response(pdu, buf, len, COAP_CODE_CHANGED);
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}
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else {
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return gcoap_response(pdu, buf, len, COAP_CODE_BAD_REQUEST);
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}
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}
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return 0;
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}
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static ssize_t _riot_board_handler(coap_pkt_t *pdu, uint8_t *buf, size_t len, void *ctx)
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{
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(void)ctx;
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gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
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coap_opt_add_format(pdu, COAP_FORMAT_TEXT);
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size_t resp_len = coap_opt_finish(pdu, COAP_OPT_FINISH_PAYLOAD);
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/* write the RIOT board name in the response buffer */
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if (pdu->payload_len >= strlen(RIOT_BOARD)) {
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memcpy(pdu->payload, RIOT_BOARD, strlen(RIOT_BOARD));
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return resp_len + strlen(RIOT_BOARD);
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}
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else {
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puts("gcoap_cli: msg buffer too small");
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return gcoap_response(pdu, buf, len, COAP_CODE_INTERNAL_SERVER_ERROR);
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}
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}
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static bool _parse_endpoint(sock_udp_ep_t *remote,
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const char *addr_str, const char *port_str)
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{
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@ -307,6 +187,12 @@ static size_t _send(uint8_t *buf, size_t len, char *addr_str, char *port_str)
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return bytes_sent;
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}
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static int _print_usage(char **argv)
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{
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printf("usage: %s <get|post|put|ping|proxy|info>\n", argv[0]);
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return 1;
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}
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int gcoap_cli_cmd(int argc, char **argv)
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{
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/* Ordered like the RFC method code numbers, but off by 1. GET is code 0. */
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@ -317,7 +203,7 @@ int gcoap_cli_cmd(int argc, char **argv)
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if (argc == 1) {
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/* show help for main commands */
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goto end;
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return _print_usage(argv);
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}
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if (strcmp(argv[1], "info") == 0) {
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@ -376,7 +262,7 @@ int gcoap_cli_cmd(int argc, char **argv)
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}
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}
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if (code_pos == -1) {
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goto end;
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return _print_usage(argv);
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}
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/* parse options */
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@ -447,22 +333,7 @@ int gcoap_cli_cmd(int argc, char **argv)
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}
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else {
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/* send Observe notification for /cli/stats */
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switch (gcoap_obs_init(&pdu, &buf[0], CONFIG_GCOAP_PDU_BUF_SIZE,
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&_resources[0])) {
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case GCOAP_OBS_INIT_OK:
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DEBUG("gcoap_cli: creating /cli/stats notification\n");
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coap_opt_add_format(&pdu, COAP_FORMAT_TEXT);
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len = coap_opt_finish(&pdu, COAP_OPT_FINISH_PAYLOAD);
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len += fmt_u16_dec((char *)pdu.payload, req_count);
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gcoap_obs_send(&buf[0], len, &_resources[0]);
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break;
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case GCOAP_OBS_INIT_UNUSED:
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DEBUG("gcoap_cli: no observer for /cli/stats\n");
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break;
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case GCOAP_OBS_INIT_ERR:
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DEBUG("gcoap_cli: error initializing /cli/stats notification\n");
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break;
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}
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notify_observers();
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}
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return 0;
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}
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@ -475,26 +346,5 @@ int gcoap_cli_cmd(int argc, char **argv)
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return 1;
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}
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end:
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printf("usage: %s <get|post|put|ping|proxy|info>\n", argv[0]);
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return 1;
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}
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void gcoap_cli_init(void)
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{
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#if IS_USED(MODULE_GCOAP_DTLS)
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int res = credman_add(&credential);
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if (res < 0 && res != CREDMAN_EXIST) {
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/* ignore duplicate credentials */
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printf("gcoap: cannot add credential to system: %d\n", res);
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return;
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}
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sock_dtls_t *gcoap_sock_dtls = gcoap_get_sock_dtls();
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res = sock_dtls_add_credential(gcoap_sock_dtls, GCOAP_DTLS_CREDENTIAL_TAG);
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if (res < 0) {
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printf("gcoap: cannot add credential to DTLS sock: %d\n", res);
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}
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#endif
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gcoap_register_listener(&_listener);
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return _print_usage(argv);
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}
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65
examples/gcoap/gcoap_example.h
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65
examples/gcoap/gcoap_example.h
Normal file
@ -0,0 +1,65 @@
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/*
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* Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup examples
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* @{
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*
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* @file
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* @brief gcoap example
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*
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* @author Ken Bannister <kb2ma@runbox.com>
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*/
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#ifndef GCOAP_EXAMPLE_H
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#define GCOAP_EXAMPLE_H
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#include <stdint.h>
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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 "fmt.h"
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#include "net/gcoap.h"
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#include "net/utils.h"
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#include "od.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern uint16_t req_count; /**< Counts requests sent by CLI. */
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/**
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* @brief Shell interface exposing the client side features of gcoap
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* @param argc Number of shell arguments (including shell command name)
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* @param argv Shell argument values (including shell command name)
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* @return Exit status of the shell command
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*/
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int gcoap_cli_cmd(int argc, char **argv);
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/**
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* @brief Registers the CoAP resources exposed in the example app
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*
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* Run this exactly one during startup.
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*/
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void server_init(void);
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/**
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* @brief Notifies all observers registered to /cli/stats - if any
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*
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* Call this whenever the count of successfully send client requests changes
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*/
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void notify_observers(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GCOAP_EXAMPLE_H */
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/** @} */
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@ -24,12 +24,11 @@
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#include "net/gcoap.h"
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#include "shell.h"
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#include "gcoap_example.h"
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#define MAIN_QUEUE_SIZE (4)
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static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
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extern int gcoap_cli_cmd(int argc, char **argv);
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extern void gcoap_cli_init(void);
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static const shell_command_t shell_commands[] = {
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{ "coap", "CoAP example", gcoap_cli_cmd },
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{ NULL, NULL, NULL }
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@ -39,7 +38,7 @@ int main(void)
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{
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/* for the thread running the shell */
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msg_init_queue(_main_msg_queue, MAIN_QUEUE_SIZE);
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gcoap_cli_init();
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server_init();
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puts("gcoap example app");
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/* start shell */
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204
examples/gcoap/server.c
Normal file
204
examples/gcoap/server.c
Normal file
@ -0,0 +1,204 @@
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/*
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* Copyright (c) 2015-2017 Ken Bannister. All rights reserved.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup examples
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* @{
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*
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* @file
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* @brief gcoap CLI support
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*
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* @author Ken Bannister <kb2ma@runbox.com>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <stdint.h>
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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 "fmt.h"
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#include "net/gcoap.h"
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#include "net/utils.h"
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#include "od.h"
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#include "gcoap_example.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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#if IS_USED(MODULE_GCOAP_DTLS)
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#include "net/credman.h"
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#include "net/dsm.h"
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#include "tinydtls_keys.h"
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/* Example credential tag for credman. Tag together with the credential type needs to be unique. */
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#define GCOAP_DTLS_CREDENTIAL_TAG 10
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static const uint8_t psk_id_0[] = PSK_DEFAULT_IDENTITY;
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static const uint8_t psk_key_0[] = PSK_DEFAULT_KEY;
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static const credman_credential_t credential = {
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.type = CREDMAN_TYPE_PSK,
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.tag = GCOAP_DTLS_CREDENTIAL_TAG,
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.params = {
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.psk = {
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.key = { .s = psk_key_0, .len = sizeof(psk_key_0) - 1, },
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.id = { .s = psk_id_0, .len = sizeof(psk_id_0) - 1, },
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}
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},
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};
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#endif
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static ssize_t _encode_link(const coap_resource_t *resource, char *buf,
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size_t maxlen, coap_link_encoder_ctx_t *context);
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static ssize_t _stats_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx);
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static ssize_t _riot_board_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx);
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/* CoAP resources. Must be sorted by path (ASCII order). */
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static const coap_resource_t _resources[] = {
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{ "/cli/stats", COAP_GET | COAP_PUT, _stats_handler, NULL },
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{ "/riot/board", COAP_GET, _riot_board_handler, NULL },
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};
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static const char *_link_params[] = {
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";ct=0;rt=\"count\";obs",
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NULL
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};
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static gcoap_listener_t _listener = {
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&_resources[0],
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ARRAY_SIZE(_resources),
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_encode_link,
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NULL,
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NULL
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};
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/* Adds link format params to resource list */
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static ssize_t _encode_link(const coap_resource_t *resource, char *buf,
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size_t maxlen, coap_link_encoder_ctx_t *context) {
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ssize_t res = gcoap_encode_link(resource, buf, maxlen, context);
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if (res > 0) {
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if (_link_params[context->link_pos]
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&& (strlen(_link_params[context->link_pos]) < (maxlen - res))) {
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if (buf) {
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memcpy(buf+res, _link_params[context->link_pos],
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strlen(_link_params[context->link_pos]));
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}
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return res + strlen(_link_params[context->link_pos]);
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}
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}
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return res;
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}
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/*
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* Server callback for /cli/stats. Accepts either a GET or a PUT.
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*
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* GET: Returns the count of packets sent by the CLI.
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* PUT: Updates the count of packets. Rejects an obviously bad request, but
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* allows any two byte value for example purposes. Semantically, the only
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* valid action is to set the value to 0.
|
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*/
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static ssize_t _stats_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, void *ctx)
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{
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(void)ctx;
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/* read coap method type in packet */
|
||||
unsigned method_flag = coap_method2flag(coap_get_code_detail(pdu));
|
||||
|
||||
switch (method_flag) {
|
||||
case COAP_GET:
|
||||
gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
|
||||
coap_opt_add_format(pdu, COAP_FORMAT_TEXT);
|
||||
size_t resp_len = coap_opt_finish(pdu, COAP_OPT_FINISH_PAYLOAD);
|
||||
|
||||
/* write the response buffer with the request count value */
|
||||
resp_len += fmt_u16_dec((char *)pdu->payload, req_count);
|
||||
return resp_len;
|
||||
|
||||
case COAP_PUT:
|
||||
/* convert the payload to an integer and update the internal
|
||||
value */
|
||||
if (pdu->payload_len <= 5) {
|
||||
char payload[6] = { 0 };
|
||||
memcpy(payload, (char *)pdu->payload, pdu->payload_len);
|
||||
req_count = (uint16_t)strtoul(payload, NULL, 10);
|
||||
return gcoap_response(pdu, buf, len, COAP_CODE_CHANGED);
|
||||
}
|
||||
else {
|
||||
return gcoap_response(pdu, buf, len, COAP_CODE_BAD_REQUEST);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t _riot_board_handler(coap_pkt_t *pdu, uint8_t *buf, size_t len, void *ctx)
|
||||
{
|
||||
(void)ctx;
|
||||
gcoap_resp_init(pdu, buf, len, COAP_CODE_CONTENT);
|
||||
coap_opt_add_format(pdu, COAP_FORMAT_TEXT);
|
||||
size_t resp_len = coap_opt_finish(pdu, COAP_OPT_FINISH_PAYLOAD);
|
||||
|
||||
/* write the RIOT board name in the response buffer */
|
||||
if (pdu->payload_len >= strlen(RIOT_BOARD)) {
|
||||
memcpy(pdu->payload, RIOT_BOARD, strlen(RIOT_BOARD));
|
||||
return resp_len + strlen(RIOT_BOARD);
|
||||
}
|
||||
else {
|
||||
puts("gcoap_cli: msg buffer too small");
|
||||
return gcoap_response(pdu, buf, len, COAP_CODE_INTERNAL_SERVER_ERROR);
|
||||
}
|
||||
}
|
||||
|
||||
void notify_observers(void)
|
||||
{
|
||||
size_t len;
|
||||
uint8_t buf[CONFIG_GCOAP_PDU_BUF_SIZE];
|
||||
coap_pkt_t pdu;
|
||||
|
||||
/* send Observe notification for /cli/stats */
|
||||
switch (gcoap_obs_init(&pdu, &buf[0], CONFIG_GCOAP_PDU_BUF_SIZE,
|
||||
&_resources[0])) {
|
||||
case GCOAP_OBS_INIT_OK:
|
||||
DEBUG("gcoap_cli: creating /cli/stats notification\n");
|
||||
coap_opt_add_format(&pdu, COAP_FORMAT_TEXT);
|
||||
len = coap_opt_finish(&pdu, COAP_OPT_FINISH_PAYLOAD);
|
||||
len += fmt_u16_dec((char *)pdu.payload, req_count);
|
||||
gcoap_obs_send(&buf[0], len, &_resources[0]);
|
||||
break;
|
||||
case GCOAP_OBS_INIT_UNUSED:
|
||||
DEBUG("gcoap_cli: no observer for /cli/stats\n");
|
||||
break;
|
||||
case GCOAP_OBS_INIT_ERR:
|
||||
DEBUG("gcoap_cli: error initializing /cli/stats notification\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void server_init(void)
|
||||
{
|
||||
#if IS_USED(MODULE_GCOAP_DTLS)
|
||||
int res = credman_add(&credential);
|
||||
if (res < 0 && res != CREDMAN_EXIST) {
|
||||
/* ignore duplicate credentials */
|
||||
printf("gcoap: cannot add credential to system: %d\n", res);
|
||||
return;
|
||||
}
|
||||
sock_dtls_t *gcoap_sock_dtls = gcoap_get_sock_dtls();
|
||||
res = sock_dtls_add_credential(gcoap_sock_dtls, GCOAP_DTLS_CREDENTIAL_TAG);
|
||||
if (res < 0) {
|
||||
printf("gcoap: cannot add credential to DTLS sock: %d\n", res);
|
||||
}
|
||||
#endif
|
||||
|
||||
gcoap_register_listener(&_listener);
|
||||
}
|
1
examples/gcoap_dtls/client.c
Symbolic link
1
examples/gcoap_dtls/client.c
Symbolic link
@ -0,0 +1 @@
|
||||
../gcoap/client.c
|
@ -1 +0,0 @@
|
||||
../gcoap/gcoap_cli.c
|
1
examples/gcoap_dtls/gcoap_example.h
Symbolic link
1
examples/gcoap_dtls/gcoap_example.h
Symbolic link
@ -0,0 +1 @@
|
||||
../gcoap/gcoap_example.h
|
1
examples/gcoap_dtls/server.c
Symbolic link
1
examples/gcoap_dtls/server.c
Symbolic link
@ -0,0 +1 @@
|
||||
../gcoap/server.c
|
Loading…
Reference in New Issue
Block a user