* Use "example" in all example function & variable names, ie use i2c_example_xxx instead of i2c_xxx for example functions. Closes #198 https://github.com/espressif/esp-idf/issues/198 * Mark example functions, etc. static * Replace uses of "test" & "demo" with "example" * Split the UART example into two * Rename "main" example files to end with "_main.c" for disambiguation
192 lines
6 KiB
C
192 lines
6 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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#define COAP_DEFAULT_TIME_SEC 5
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#define COAP_DEFAULT_TIME_USEC 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 coap_async_state_t *async = NULL;
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static void
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send_async_response(coap_context_t *ctx, const coap_endpoint_t *local_if)
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{
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coap_pdu_t *response;
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unsigned char buf[3];
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const char* response_data = "Hello World!";
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size_t size = sizeof(coap_hdr_t) + 20;
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response = coap_pdu_init(async->flags & COAP_MESSAGE_CON, COAP_RESPONSE_CODE(205), 0, size);
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response->hdr->id = coap_new_message_id(ctx);
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if (async->tokenlen)
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coap_add_token(response, async->tokenlen, async->token);
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coap_add_option(response, COAP_OPTION_CONTENT_TYPE, coap_encode_var_bytes(buf, COAP_MEDIATYPE_TEXT_PLAIN), buf);
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coap_add_data (response, strlen(response_data), (unsigned char *)response_data);
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if (coap_send(ctx, local_if, &async->peer, response) == COAP_INVALID_TID) {
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}
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coap_delete_pdu(response);
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coap_async_state_t *tmp;
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coap_remove_async(ctx, async->id, &tmp);
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coap_free_async(async);
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async = NULL;
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}
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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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async_handler(coap_context_t *ctx, struct coap_resource_t *resource,
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const coap_endpoint_t *local_interface, coap_address_t *peer,
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coap_pdu_t *request, str *token, coap_pdu_t *response)
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{
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async = coap_register_async(ctx, peer, request, COAP_ASYNC_SEPARATE | COAP_ASYNC_CONFIRM, (void*)"no data");
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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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fd_set readfds;
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struct timeval tv;
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int flags = 0;
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while (1) {
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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(&serv_addr);
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if (ctx) {
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flags = fcntl(ctx->sockfd, F_GETFL, 0);
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fcntl(ctx->sockfd, F_SETFL, flags|O_NONBLOCK);
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tv.tv_usec = COAP_DEFAULT_TIME_USEC;
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tv.tv_sec = COAP_DEFAULT_TIME_SEC;
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/* Initialize the resource */
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resource = coap_resource_init((unsigned char *)"Espressif", 9, 0);
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if (resource){
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coap_register_handler(resource, COAP_REQUEST_GET, async_handler);
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coap_add_resource(ctx, resource);
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/*For incoming connections*/
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for (;;) {
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FD_ZERO(&readfds);
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FD_CLR( ctx->sockfd, &readfds);
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FD_SET( ctx->sockfd, &readfds);
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int result = select( FD_SETSIZE, &readfds, 0, 0, &tv );
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if (result > 0){
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if (FD_ISSET( ctx->sockfd, &readfds ))
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coap_read(ctx);
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} else if (result < 0){
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break;
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} else {
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ESP_LOGE(TAG, "select timeout");
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}
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if (async) {
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send_async_response(ctx, ctx->endpoint);
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}
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}
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}
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coap_free_context(ctx);
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}
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}
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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", 2048, NULL, 5, NULL);
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}
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