ESP32 Wi-Fi Setup

#include #include "esp_log.h" #include "esp_wifi.h" #include "esp_event.h" #include "esp_system.h" #include "nvs_flash.h" #include "nvs.h" #include "esp_netif.h" #include "esp_http_server.h" #define AP_SSID "ESP32_Setup" #define AP_PASS "12345678" static const char *TAG = "wifi_setup"; static esp_err_t save_credentials(const char *ssid, const char *password) { nvs_handle_t nvs; ESP_ERROR_CHECK(nvs_open("storage", NVS_READWRITE, &nvs)); ESP_ERROR_CHECK(nvs_set_str(nvs, "wifi_ssid", ssid)); ESP_ERROR_CHECK(nvs_set_str(nvs, "wifi_pass", password)); ESP_ERROR_CHECK(nvs_commit(nvs)); nvs_close(nvs); return ESP_OK; } static esp_err_t load_credentials(char *ssid, char *password) { nvs_handle_t nvs; size_t ssid_len = 32, pass_len = 64; ESP_ERROR_CHECK(nvs_open("storage", NVS_READWRITE, &nvs)); esp_err_t ssid_err = nvs_get_str(nvs, "wifi_ssid", ssid, &ssid_len); esp_err_t pass_err = nvs_get_str(nvs, "wifi_pass", password, &pass_len); nvs_close(nvs); return (ssid_err == ESP_OK && pass_err == ESP_OK) ? ESP_OK : ESP_FAIL; } // HTML Page for input const char *html_form = "\ \ ESP32 Wi-Fi Setup\ \

Enter Wi-Fi Credentials

\ "; static esp_err_t handle_root(httpd_req_t *req) { httpd_resp_send(req, html_form, HTTPD_RESP_USE_STRLEN); return ESP_OK; } static esp_err_t handle_connect(httpd_req_t *req) { char buf[512]; // Increase buffer size if needed int len = httpd_req_recv(req, buf, sizeof(buf) - 1); if (len <= 0) return ESP_FAIL; buf[len] = '\0'; // Parse POST data from body char ssid[32], password[64]; int ret = sscanf(buf, "ssid=%31[^&]&password=%63s", ssid, password); if (ret != 2) { ESP_LOGE(TAG, "Failed to parse form data"); httpd_resp_send(req, "Invalid data", HTTPD_RESP_USE_STRLEN); return ESP_FAIL; } ESP_LOGI(TAG, "Received SSID: %s, Password: %s", ssid, password); save_credentials(ssid, password); httpd_resp_send(req, "Saved! Rebooting...", HTTPD_RESP_USE_STRLEN); vTaskDelay(2000 / portTICK_PERIOD_MS); esp_restart(); // Restart to apply new credentials return ESP_OK; } void start_webserver() { httpd_config_t config = HTTPD_DEFAULT_CONFIG(); httpd_handle_t server = NULL; if (httpd_start(&server, &config) == ESP_OK) { httpd_uri_t root_uri = { .uri = "/", .method = HTTP_GET, .handler = handle_root }; httpd_uri_t connect_uri = { .uri = "/connect", .method = HTTP_POST, .handler = handle_connect }; httpd_register_uri_handler(server, &root_uri); httpd_register_uri_handler(server, &connect_uri); } } void start_ap_mode() { esp_netif_create_default_wifi_ap(); wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); esp_wifi_init(&cfg); esp_wifi_set_mode(WIFI_MODE_AP); wifi_config_t ap_config = { .ap = { .ssid = AP_SSID, .password = AP_PASS, .max_connection = 4, .authmode = WIFI_AUTH_WPA_WPA2_PSK } }; esp_wifi_set_config(WIFI_IF_AP, &ap_config); esp_wifi_start(); start_webserver(); } void connect_to_wifi() { esp_netif_create_default_wifi_sta(); wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); esp_wifi_init(&cfg); esp_wifi_set_mode(WIFI_MODE_STA); char ssid[32] = "", password[64] = ""; if (load_credentials(ssid, password) == ESP_OK) { wifi_config_t sta_config = {}; strncpy((char *)sta_config.sta.ssid, ssid, sizeof(sta_config.sta.ssid)); strncpy((char *)sta_config.sta.password, password, sizeof(sta_config.sta.password)); esp_wifi_set_config(WIFI_IF_STA, &sta_config); esp_wifi_start(); esp_wifi_connect(); ESP_LOGI(TAG, "Connecting to SSID: %s", ssid); } else { ESP_LOGW(TAG, "No saved credentials, starting in AP mode."); start_ap_mode(); } } void app_main() { ESP_ERROR_CHECK(nvs_flash_init()); ESP_ERROR_CHECK(esp_netif_init()); ESP_ERROR_CHECK(esp_event_loop_create_default()); connect_to_wifi(); }