--- /dev/null
+/* CoAP client Example
+
+ This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+ Unless required by applicable law or agreed to in writing, this
+ software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include "coap_client.h"
+
+#include <string.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+
+#include "esp_log.h"
+#include "esp_wifi.h"
+#include "esp_event_loop.h"
+
+#include "nvs_flash.h"
+#include <sys/socket.h>
+
+#include "coap_config.h"
+#include "resource.h"
+#include "coap.h"
+
+
+static EventGroupHandle_t wifi_event_group;
+
+/* The event group allows multiple bits for each event,
+ but we only care about one event - are we connected
+ to the AP with an IP? */
+const static int CONNECTED_BIT = BIT0;
+
+const static char *TAG = "CoAP_demo";
+
+static void message_handler(struct coap_context_t *ctx, const coap_endpoint_t *local_interface, const coap_address_t *remote,
+ coap_pdu_t *sent, coap_pdu_t *received,
+ const coap_tid_t id)
+{
+ unsigned char* data = NULL;
+ size_t data_len;
+ if (COAP_RESPONSE_CLASS(received->hdr->code) == 2) {
+ if (coap_get_data(received, &data_len, &data)) {
+ printf("Received: %s\n", data);
+ }
+ }
+}
+
+static void coap_demo_thread(void *p)
+{
+ coap_context_t* ctx = NULL;
+ coap_address_t dst_addr, src_addr;
+ static coap_uri_t uri;
+ fd_set readfds;
+ struct timeval tv;
+ int flags, result;
+ coap_pdu_t* request = NULL;
+ const char* server_uri = COAP_DEFAULT_DEMO_URI;
+ uint8_t get_method = 1;
+
+ coap_address_init(&src_addr);
+ src_addr.addr.sin.sin_family = AF_INET;
+ src_addr.addr.sin.sin_port = htons(0);
+ src_addr.addr.sin.sin_addr.s_addr = INADDR_ANY;
+
+ ctx = coap_new_context(&src_addr);
+ if (ctx) {
+ coap_address_init(&dst_addr);
+ dst_addr.addr.sin.sin_family = AF_INET;
+ dst_addr.addr.sin.sin_port = htons(COAP_DEFAULT_PORT);
+ dst_addr.addr.sin.sin_addr.s_addr = inet_addr(COAP_DEFAULT_DEMO_ADDR);
+
+ coap_split_uri((const uint8_t *)server_uri, strlen(server_uri), &uri);
+ request = coap_new_pdu();
+ if (request){
+ request->hdr->type = COAP_MESSAGE_CON;
+ request->hdr->id = coap_new_message_id(ctx);
+ request->hdr->code = get_method;
+ coap_add_option(request, COAP_OPTION_URI_PATH, uri.path.length, uri.path.s);
+
+ coap_register_response_handler(ctx, message_handler);
+ coap_send_confirmed(ctx, ctx->endpoint, &dst_addr, request);
+
+ flags = fcntl(ctx->sockfd, F_GETFL, 0);
+ fcntl(ctx->sockfd, F_SETFL, flags|O_NONBLOCK);
+
+ tv.tv_usec = COAP_DEFAULT_TIME_USEC;
+ tv.tv_sec = COAP_DEFAULT_TIME_SEC;
+
+ for(;;) {
+ FD_ZERO(&readfds);
+ FD_CLR( ctx->sockfd, &readfds );
+ FD_SET( ctx->sockfd, &readfds );
+ result = select( FD_SETSIZE, &readfds, 0, 0, &tv );
+ if (result > 0) {
+ if (FD_ISSET( ctx->sockfd, &readfds ))
+ coap_read(ctx);
+ } else if (result < 0) {
+ break;
+ } else {
+ printf("select timeout\n");
+ }
+ }
+ }
+ coap_free_context(ctx);
+ }
+
+ vTaskDelete(NULL);
+}
+
+static void coap_server_init(void)
+{
+ int ret = pdPASS;
+ xTaskHandle coap_handle = NULL;
+
+ ret = xTaskCreate(coap_demo_thread,
+ COAP_DEMO_THREAD_NAME,
+ COAP_DEMO_THREAD_STACK_WORDS,
+ NULL,
+ COAP_DEMO_THREAD_PRORIOTY,
+ &coap_handle);
+
+ if (ret != pdPASS) {
+ ESP_LOGI(TAG, "create thread %s failed", COAP_DEMO_THREAD_NAME);
+ }
+}
+
+static esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
+{
+ switch(event->event_id) {
+ case SYSTEM_EVENT_STA_START:
+ esp_wifi_connect();
+ break;
+ case SYSTEM_EVENT_STA_GOT_IP:
+ xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
+ coap_server_init();
+ break;
+ case SYSTEM_EVENT_STA_DISCONNECTED:
+ /* This is a workaround as ESP32 WiFi libs don't currently
+ auto-reassociate. */
+ esp_wifi_connect();
+ xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
+ break;
+ default:
+ break;
+ }
+ return ESP_OK;
+}
+
+static void wifi_conn_init(void)
+{
+ tcpip_adapter_init();
+ wifi_event_group = xEventGroupCreate();
+ ESP_ERROR_CHECK( esp_event_loop_init(wifi_event_handler, NULL) );
+ wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+ ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
+ ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
+ wifi_config_t wifi_config = {
+ .sta = {
+ .ssid = EXAMPLE_WIFI_SSID,
+ .password = EXAMPLE_WIFI_PASS,
+ },
+ };
+ ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
+ ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+
+ ESP_ERROR_CHECK( esp_wifi_start() );
+}
+
+void app_main(void)
+{
+ nvs_flash_init();
+ wifi_conn_init();
+}
--- /dev/null
+/* CoAP client Example
+
+ This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+ Unless required by applicable law or agreed to in writing, this
+ software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+#ifndef _COAP_CLIENT_H_
+#define _COAP_CLIENT_H_
+
+#include <sdkconfig.h>
+
+/* The examples use simple WiFi configuration that you can set via
+ 'make menuconfig'.
+
+ If you'd rather not, just change the below entries to strings with
+ the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
+*/
+#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
+#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
+
+#define COAP_DEMO_THREAD_NAME "CoAP_demo"
+#define COAP_DEMO_THREAD_STACK_WORDS 10240
+#define COAP_DEMO_THREAD_PRORIOTY 8
+
+#define COAP_DEFAULT_TIME_SEC 5
+#define COAP_DEFAULT_TIME_USEC 0
+
+/* The examples use domain of "californium.eclipse.org",uri "coap://californium.eclipse.org" and port number of 5683 that
+ you can set via 'make menuconfig'.
+
+ If you'd rather not, just change the below entries to strings with
+ the config you want - ie #define COAP_DEFAULT_DEMO_ADDR "californium.eclipse.org"
+ , ie #define COAP_DEFAULT_DEMO_URI "coap://californium.eclipse.org" and ie #define COAP_DEFAULT_PORT 5683
+*/
+#define COAP_DEFAULT_PORT CONFIG_TARGET_PORT_NUMBER
+#define COAP_DEFAULT_DEMO_ADDR CONFIG_TARGET_DOMAIN
+#define COAP_DEFAULT_DEMO_URI CONFIG_TARGET_DOMAIN_URI
+
+#endif
+
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