176 lines
4.8 KiB
C
176 lines
4.8 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 "coap_client.h"
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#include <string.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 <sys/socket.h>
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#include "coap_config.h"
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#include "resource.h"
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#include "coap.h"
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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_demo";
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static void message_handler(struct coap_context_t *ctx, const coap_endpoint_t *local_interface, const coap_address_t *remote,
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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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if (COAP_RESPONSE_CLASS(received->hdr->code) == 2) {
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if (coap_get_data(received, &data_len, &data)) {
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printf("Received: %s\n", data);
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}
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}
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}
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static void coap_demo_thread(void *p)
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{
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coap_context_t* ctx = NULL;
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coap_address_t dst_addr, src_addr;
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static coap_uri_t uri;
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fd_set readfds;
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struct timeval tv;
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int flags, result;
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coap_pdu_t* request = NULL;
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const char* server_uri = COAP_DEFAULT_DEMO_URI;
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uint8_t get_method = 1;
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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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ctx = coap_new_context(&src_addr);
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if (ctx) {
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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(COAP_DEFAULT_PORT);
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dst_addr.addr.sin.sin_addr.s_addr = inet_addr(COAP_DEFAULT_DEMO_ADDR);
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coap_split_uri((const uint8_t *)server_uri, strlen(server_uri), &uri);
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request = coap_new_pdu();
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if (request){
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request->hdr->type = COAP_MESSAGE_CON;
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request->hdr->id = coap_new_message_id(ctx);
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request->hdr->code = get_method;
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coap_add_option(request, COAP_OPTION_URI_PATH, uri.path.length, uri.path.s);
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coap_register_response_handler(ctx, message_handler);
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coap_send_confirmed(ctx, ctx->endpoint, &dst_addr, request);
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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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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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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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printf("select timeout\n");
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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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vTaskDelete(NULL);
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}
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static void coap_server_init(void)
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{
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int ret = pdPASS;
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xTaskHandle coap_handle = NULL;
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ret = xTaskCreate(coap_demo_thread,
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COAP_DEMO_THREAD_NAME,
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COAP_DEMO_THREAD_STACK_WORDS,
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NULL,
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COAP_DEMO_THREAD_PRORIOTY,
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&coap_handle);
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if (ret != pdPASS) {
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ESP_LOGI(TAG, "create thread %s failed", COAP_DEMO_THREAD_NAME);
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}
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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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coap_server_init();
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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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nvs_flash_init();
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wifi_conn_init();
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}
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