mirror of
https://github.com/espressif/esp-idf.git
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296 lines
9.2 KiB
C
296 lines
9.2 KiB
C
/* CoAP client Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <string.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_log.h"
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#include "esp_wifi.h"
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#include "esp_event.h"
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#include "nvs_flash.h"
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#include "protocol_examples_common.h"
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#include "coap.h"
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#define COAP_DEFAULT_TIME_SEC 5
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/* Set this to 9 to get verbose logging from within libcoap */
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#define COAP_LOGGING_LEVEL 0
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/* The examples use uri "coap://californium.eclipse.org" that
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you can set via 'make menuconfig'.
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define COAP_DEFAULT_DEMO_URI "coap://californium.eclipse.org"
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*/
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#define COAP_DEFAULT_DEMO_URI CONFIG_TARGET_DOMAIN_URI
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const static char *TAG = "CoAP_client";
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static int resp_wait = 1;
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static coap_optlist_t *optlist = NULL;
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static int wait_ms;
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static void message_handler(coap_context_t *ctx, coap_session_t *session,
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coap_pdu_t *sent, coap_pdu_t *received,
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const coap_tid_t id)
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{
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unsigned char* data = NULL;
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size_t data_len;
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coap_pdu_t *pdu = NULL;
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coap_opt_t *block_opt;
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coap_opt_iterator_t opt_iter;
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unsigned char buf[4];
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coap_optlist_t *option;
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coap_tid_t tid;
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if (COAP_RESPONSE_CLASS(received->code) == 2) {
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/* Need to see if blocked response */
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block_opt = coap_check_option(received, COAP_OPTION_BLOCK2, &opt_iter);
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if (block_opt) {
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uint16_t blktype = opt_iter.type;
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if (coap_opt_block_num(block_opt) == 0) {
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printf("Received:\n");
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}
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if (coap_get_data(received, &data_len, &data)) {
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printf("%.*s", (int)data_len, data);
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}
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if (COAP_OPT_BLOCK_MORE(block_opt)) {
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/* more bit is set */
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/* create pdu with request for next block */
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pdu = coap_new_pdu(session);
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if (!pdu) {
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ESP_LOGE(TAG, "coap_new_pdu() failed");
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goto clean_up;
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}
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pdu->type = COAP_MESSAGE_CON;
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pdu->tid = coap_new_message_id(session);
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pdu->code = COAP_REQUEST_GET;
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/* add URI components from optlist */
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for (option = optlist; option; option = option->next ) {
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switch (option->number) {
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case COAP_OPTION_URI_HOST :
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case COAP_OPTION_URI_PORT :
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case COAP_OPTION_URI_PATH :
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case COAP_OPTION_URI_QUERY :
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coap_add_option(pdu, option->number, option->length,
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option->data);
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break;
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default:
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; /* skip other options */
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}
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}
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/* finally add updated block option from response, clear M bit */
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/* blocknr = (blocknr & 0xfffffff7) + 0x10; */
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coap_add_option(pdu,
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blktype,
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coap_encode_var_safe(buf, sizeof(buf),
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((coap_opt_block_num(block_opt) + 1) << 4) |
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COAP_OPT_BLOCK_SZX(block_opt)), buf);
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tid = coap_send(session, pdu);
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if (tid != COAP_INVALID_TID) {
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resp_wait = 1;
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wait_ms = COAP_DEFAULT_TIME_SEC * 1000;
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return;
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}
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}
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printf("\n");
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} else {
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if (coap_get_data(received, &data_len, &data)) {
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printf("Received: %.*s\n", (int)data_len, data);
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}
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}
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}
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clean_up:
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resp_wait = 0;
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}
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static void coap_example_task(void *p)
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{
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struct hostent *hp;
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struct ip4_addr *ip4_addr;
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coap_address_t dst_addr, src_addr;
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static coap_uri_t uri;
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const char* server_uri = COAP_DEFAULT_DEMO_URI;
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char* phostname = NULL;
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coap_set_log_level(COAP_LOGGING_LEVEL);
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while (1) {
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#define BUFSIZE 40
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unsigned char _buf[BUFSIZE];
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unsigned char *buf;
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size_t buflen;
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int res;
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coap_context_t *ctx = NULL;
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coap_session_t *session = NULL;
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coap_pdu_t *request = NULL;
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optlist = NULL;
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if (coap_split_uri((const uint8_t *)server_uri, strlen(server_uri), &uri) == -1) {
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ESP_LOGE(TAG, "CoAP server uri error");
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break;
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}
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if ((uri.scheme==COAP_URI_SCHEME_COAPS && !coap_dtls_is_supported()) ||
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(uri.scheme==COAP_URI_SCHEME_COAPS_TCP && !coap_tls_is_supported())) {
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ESP_LOGE(TAG, "CoAP server uri scheme error");
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break;
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}
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phostname = (char *)calloc(1, uri.host.length + 1);
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if (phostname == NULL) {
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ESP_LOGE(TAG, "calloc failed");
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continue;
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}
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memcpy(phostname, uri.host.s, uri.host.length);
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hp = gethostbyname(phostname);
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free(phostname);
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if (hp == NULL) {
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ESP_LOGE(TAG, "DNS lookup failed");
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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free(phostname);
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continue;
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}
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/* Code to print the resolved IP.
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Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */
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ip4_addr = (struct ip4_addr *)hp->h_addr;
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ESP_LOGI(TAG, "DNS lookup succeeded. IP=%s", inet_ntoa(*ip4_addr));
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coap_address_init(&src_addr);
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src_addr.addr.sin.sin_family = AF_INET;
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src_addr.addr.sin.sin_port = htons(0);
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src_addr.addr.sin.sin_addr.s_addr = INADDR_ANY;
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if (uri.path.length) {
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buflen = BUFSIZE;
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buf = _buf;
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res = coap_split_path(uri.path.s, uri.path.length, buf, &buflen);
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while (res--) {
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coap_insert_optlist(&optlist,
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coap_new_optlist(COAP_OPTION_URI_PATH,
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coap_opt_length(buf),
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coap_opt_value(buf)));
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buf += coap_opt_size(buf);
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}
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}
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if (uri.query.length) {
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buflen = BUFSIZE;
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buf = _buf;
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res = coap_split_query(uri.query.s, uri.query.length, buf, &buflen);
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while (res--) {
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coap_insert_optlist(&optlist,
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coap_new_optlist(COAP_OPTION_URI_QUERY,
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coap_opt_length(buf),
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coap_opt_value(buf)));
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buf += coap_opt_size(buf);
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}
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}
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ctx = coap_new_context(NULL);
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if (!ctx) {
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ESP_LOGE(TAG, "coap_new_context() failed");
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goto clean_up;
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}
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coap_address_init(&dst_addr);
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dst_addr.addr.sin.sin_family = AF_INET;
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dst_addr.addr.sin.sin_port = htons(uri.port);
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dst_addr.addr.sin.sin_addr.s_addr = ip4_addr->addr;
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session = coap_new_client_session(ctx, &src_addr, &dst_addr,
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uri.scheme==COAP_URI_SCHEME_COAP_TCP ? COAP_PROTO_TCP :
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uri.scheme==COAP_URI_SCHEME_COAPS_TCP ? COAP_PROTO_TLS :
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uri.scheme==COAP_URI_SCHEME_COAPS ? COAP_PROTO_DTLS : COAP_PROTO_UDP);
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if (!session) {
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ESP_LOGE(TAG, "coap_new_client_session() failed");
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goto clean_up;
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}
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coap_register_response_handler(ctx, message_handler);
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request = coap_new_pdu(session);
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if (!request) {
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ESP_LOGE(TAG, "coap_new_pdu() failed");
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goto clean_up;
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}
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request->type = COAP_MESSAGE_CON;
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request->tid = coap_new_message_id(session);
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request->code = COAP_REQUEST_GET;
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coap_add_optlist_pdu(request, &optlist);
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resp_wait = 1;
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coap_send(session, request);
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wait_ms = COAP_DEFAULT_TIME_SEC * 1000;
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while (resp_wait) {
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int result = coap_run_once(ctx, wait_ms > 1000 ? 1000 : wait_ms);
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if (result >= 0) {
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if (result >= wait_ms) {
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ESP_LOGE(TAG, "select timeout");
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break;
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} else {
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wait_ms -= result;
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}
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}
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}
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clean_up:
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if (optlist) {
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coap_delete_optlist(optlist);
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optlist = NULL;
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}
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if (session) coap_session_release(session);
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if (ctx) coap_free_context(ctx);
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coap_cleanup();
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/* Only send the request off once */
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break;
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}
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vTaskDelete(NULL);
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}
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void app_main(void)
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{
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ESP_ERROR_CHECK( nvs_flash_init() );
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tcpip_adapter_init();
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
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* Read "Establishing Wi-Fi or Ethernet Connection" section in
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* examples/protocols/README.md for more information about this function.
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*/
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ESP_ERROR_CHECK(example_connect());
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xTaskCreate(coap_example_task, "coap", 5 * 1024, NULL, 5, NULL);
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}
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