ESP32 WEB SERVER

#include #include #include #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "esp_system.h" #include "spi_flash_mmap.h" #include #include "esp_wifi.h" #include "esp_event.h" #include "freertos/event_groups.h" #include "esp_log.h" #include "nvs_flash.h" #include "esp_netif.h" #include "driver/gpio.h" #include #include #include #include #define LED_PIN 4 char on_resp[] = " ESP32 WEB SERVER

ESP32 WEB SERVER

GPIO2

GPIO state: ON

"; char off_resp[] = " ESP32 WEB SERVER

ESP32 WEB SERVER

GPIO2

GPIO state: OFF

"; static const char *TAG = "espressif"; // TAG for debug int led_state = 0; // #define EXAMPLE_ESP_WIFI_SSID "Mehrann" // #define EXAMPLE_ESP_WIFI_PASS "M1381borna" #define EXAMPLE_ESP_WIFI_SSID "shahtut" #define EXAMPLE_ESP_WIFI_PASS "@mahdikevin1321990" #define EXAMPLE_ESP_MAXIMUM_RETRY 7 /* FreeRTOS event group to signal when we are connected*/ static EventGroupHandle_t s_wifi_event_group; /* The event group allows multiple bits for each event, but we only care about two events: * - we are connected to the AP with an IP * - we failed to connect after the maximum amount of retries */ #define WIFI_CONNECTED_BIT BIT0 #define WIFI_FAIL_BIT BIT1 static int s_retry_num = 0; static void event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) { if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) { esp_wifi_connect(); } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) { if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY) { esp_wifi_connect(); s_retry_num++; ESP_LOGI(TAG, "retry to connect to the AP"); } else { xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT); } ESP_LOGI(TAG, "connect to the AP fail"); } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) { ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data; ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip)); s_retry_num = 0; xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT); } } void connect_wifi(void) { s_wifi_event_group = xEventGroupCreate(); ESP_ERROR_CHECK(esp_netif_init()); ESP_ERROR_CHECK(esp_event_loop_create_default()); esp_netif_create_default_wifi_sta(); wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); ESP_ERROR_CHECK(esp_wifi_init(&cfg)); esp_event_handler_instance_t instance_any_id; esp_event_handler_instance_t instance_got_ip; ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id)); ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip)); wifi_config_t wifi_config = { .sta = { .ssid = EXAMPLE_ESP_WIFI_SSID, .password = EXAMPLE_ESP_WIFI_PASS, /* Setting a password implies station will connect to all security modes including WEP/WPA. * However these modes are deprecated and not advisable to be used. Incase your Access point * doesn't support WPA2, these mode can be enabled by commenting below line */ .threshold.authmode = WIFI_AUTH_WPA2_PSK, }, }; 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()); ESP_LOGI(TAG, "wifi_init_sta finished."); /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */ EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY); /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually * happened. */ if (bits & WIFI_CONNECTED_BIT) { ESP_LOGI(TAG, "connected to ap SSID:%s password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS); } else if (bits & WIFI_FAIL_BIT) { ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s", EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS); } else { ESP_LOGE(TAG, "UNEXPECTED EVENT"); } vEventGroupDelete(s_wifi_event_group); } esp_err_t send_web_page(httpd_req_t *req) { int response; if (led_state == 0) response = httpd_resp_send(req, off_resp, HTTPD_RESP_USE_STRLEN); else response = httpd_resp_send(req, on_resp, HTTPD_RESP_USE_STRLEN); return response; } esp_err_t get_req_handler(httpd_req_t *req) { return send_web_page(req); } esp_err_t led_on_handler(httpd_req_t *req) { gpio_set_level(LED_PIN, 1); led_state = 1; return send_web_page(req); } esp_err_t led_off_handler(httpd_req_t *req) { gpio_set_level(LED_PIN, 0); led_state = 0; return send_web_page(req); } httpd_uri_t uri_get = { .uri = "/", .method = HTTP_GET, .handler = get_req_handler, .user_ctx = NULL}; httpd_uri_t uri_on = { .uri = "/led2on", .method = HTTP_GET, .handler = led_on_handler, .user_ctx = NULL}; httpd_uri_t uri_off = { .uri = "/led2off", .method = HTTP_GET, .handler = led_off_handler, .user_ctx = NULL}; httpd_handle_t setup_server(void) { httpd_config_t config = HTTPD_DEFAULT_CONFIG(); httpd_handle_t server = NULL; if (httpd_start(&server, &config) == ESP_OK) { httpd_register_uri_handler(server, &uri_get); httpd_register_uri_handler(server, &uri_on); httpd_register_uri_handler(server, &uri_off); } return server; } void app_main() { // Initialize NVS esp_err_t ret = nvs_flash_init(); if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) { ESP_ERROR_CHECK(nvs_flash_erase()); ret = nvs_flash_init(); } ESP_ERROR_CHECK(ret); ESP_LOGI(TAG, "ESP_WIFI_MODE_STA"); connect_wifi(); // GPIO initialization gpio_config_t io_conf; io_conf.intr_type = GPIO_INTR_DISABLE; io_conf.mode = GPIO_MODE_OUTPUT; io_conf.pin_bit_mask = (1ULL << LED_PIN); io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE; io_conf.pull_up_en = GPIO_PULLUP_DISABLE; gpio_config(&io_conf); led_state = 0; ESP_LOGI(TAG, "LED Control Web Server is running ... ...\n"); setup_server(); }