230 lines
7.1 KiB
C
230 lines
7.1 KiB
C
/* CoAP server 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 "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_loop.h"
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#include "nvs_flash.h"
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#include "coap.h"
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/* The examples use simple WiFi configuration that you can set via
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'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 EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
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#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
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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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static EventGroupHandle_t wifi_event_group;
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/* The event group allows multiple bits for each event,
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but we only care about one event - are we connected
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to the AP with an IP? */
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const static int CONNECTED_BIT = BIT0;
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const static char *TAG = "CoAP_server";
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static char espressif_data[100];
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static int espressif_data_len = 0;
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/*
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* The resource handler
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*/
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static void
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hnd_espressif_get(coap_context_t *ctx, coap_resource_t *resource,
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coap_session_t *session,
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coap_pdu_t *request, coap_binary_t *token,
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coap_string_t *query, coap_pdu_t *response)
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{
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coap_add_data_blocked_response(resource, session, request, response, token,
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COAP_MEDIATYPE_TEXT_PLAIN, 0,
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(size_t)espressif_data_len,
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(const u_char *)espressif_data);
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}
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static void
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hnd_espressif_put(coap_context_t *ctx,
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coap_resource_t *resource,
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coap_session_t *session,
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coap_pdu_t *request,
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coap_binary_t *token,
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coap_string_t *query,
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coap_pdu_t *response)
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{
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size_t size;
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unsigned char *data;
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coap_resource_notify_observers(resource, NULL);
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if (strcmp (espressif_data, "no data") == 0) {
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response->code = COAP_RESPONSE_CODE(201);
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}
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else {
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response->code = COAP_RESPONSE_CODE(204);
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}
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/* coap_get_data() sets size to 0 on error */
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(void)coap_get_data(request, &size, &data);
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if (size == 0) { /* re-init */
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snprintf(espressif_data, sizeof(espressif_data), "no data");
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espressif_data_len = strlen(espressif_data);
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} else {
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espressif_data_len = size > sizeof (espressif_data) ? sizeof (espressif_data) : size;
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memcpy (espressif_data, data, espressif_data_len);
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}
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}
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static void
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hnd_espressif_delete(coap_context_t *ctx,
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coap_resource_t *resource,
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coap_session_t *session,
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coap_pdu_t *request,
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coap_binary_t *token,
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coap_string_t *query,
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coap_pdu_t *response)
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{
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coap_resource_notify_observers(resource, NULL);
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snprintf(espressif_data, sizeof(espressif_data), "no data");
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espressif_data_len = strlen(espressif_data);
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response->code = COAP_RESPONSE_CODE(202);
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}
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static void coap_example_thread(void *p)
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{
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coap_context_t *ctx = NULL;
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coap_address_t serv_addr;
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coap_resource_t *resource = NULL;
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snprintf(espressif_data, sizeof(espressif_data), "no data");
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espressif_data_len = strlen(espressif_data);
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coap_set_log_level(COAP_LOGGING_LEVEL);
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while (1) {
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coap_endpoint_t *ep_udp = NULL;
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coap_endpoint_t *ep_tcp = NULL;
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unsigned wait_ms;
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/* Wait for the callback to set the CONNECTED_BIT in the
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event group.
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*/
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xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
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false, true, portMAX_DELAY);
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ESP_LOGI(TAG, "Connected to AP");
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/* Prepare the CoAP server socket */
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coap_address_init(&serv_addr);
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serv_addr.addr.sin.sin_family = AF_INET;
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serv_addr.addr.sin.sin_addr.s_addr = INADDR_ANY;
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serv_addr.addr.sin.sin_port = htons(COAP_DEFAULT_PORT);
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ctx = coap_new_context(NULL);
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if (!ctx) {
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continue;
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}
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ep_udp = coap_new_endpoint(ctx, &serv_addr, COAP_PROTO_UDP);
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if (!ep_udp) {
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goto clean_up;
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}
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ep_tcp = coap_new_endpoint(ctx, &serv_addr, COAP_PROTO_TCP);
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if (!ep_tcp) {
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goto clean_up;
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}
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resource = coap_resource_init(coap_make_str_const("Espressif"), 0);
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if (!resource) {
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goto clean_up;
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}
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coap_register_handler(resource, COAP_REQUEST_GET, hnd_espressif_get);
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coap_register_handler(resource, COAP_REQUEST_PUT, hnd_espressif_put);
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coap_register_handler(resource, COAP_REQUEST_DELETE, hnd_espressif_delete);
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/* We possibly want to Observe the GETs */
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coap_resource_set_get_observable(resource, 1);
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coap_add_resource(ctx, resource);
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wait_ms = COAP_RESOURCE_CHECK_TIME * 1000;
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while (1) {
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int result = coap_run_once(ctx, wait_ms);
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if (result < 0) {
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break;
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} else if (result && (unsigned)result < wait_ms) {
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/* decrement if there is a result wait time returned */
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wait_ms -= result;
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}
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if (result) {
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/* result must have been >= wait_ms, so reset wait_ms */
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wait_ms = COAP_RESOURCE_CHECK_TIME * 1000;
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}
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}
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}
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clean_up:
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coap_free_context(ctx);
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coap_cleanup();
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vTaskDelete(NULL);
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}
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static esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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/* This is a workaround as ESP32 WiFi libs don't currently
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auto-reassociate. */
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esp_wifi_connect();
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xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
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break;
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default:
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break;
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}
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return ESP_OK;
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}
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static void wifi_conn_init(void)
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{
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tcpip_adapter_init();
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wifi_event_group = xEventGroupCreate();
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ESP_ERROR_CHECK( esp_event_loop_init(wifi_event_handler, NULL) );
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
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ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_WIFI_SSID,
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.password = EXAMPLE_WIFI_PASS,
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},
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};
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ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
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ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
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ESP_ERROR_CHECK( esp_wifi_start() );
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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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wifi_conn_init();
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xTaskCreate(coap_example_thread, "coap", 1024 * 5, NULL, 5, NULL);
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}
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