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+/*
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+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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+ *
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+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
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+ */
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+/* WiFi softAP & station Example
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+
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+ This example code is in the Public Domain (or CC0 licensed, at your option.)
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+
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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 "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_mac.h"
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+#include "esp_wifi.h"
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+#include "esp_event.h"
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+#include "esp_log.h"
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+#include "esp_netif_net_stack.h"
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+#include "esp_netif.h"
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+#include "nvs_flash.h"
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+#include "lwip/inet.h"
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+#include "lwip/netdb.h"
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+#include "lwip/sockets.h"
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+#if IP_NAPT
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+#include "lwip/lwip_napt.h"
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+#endif
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+#include "lwip/err.h"
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+#include "lwip/sys.h"
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+
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+/* The examples use WiFi configuration that you can set via project configuration menu.
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+
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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_ESP_WIFI_STA_SSID "mywifissid"
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+*/
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+
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+/* STA Configuration */
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+#define EXAMPLE_ESP_WIFI_STA_SSID CONFIG_ESP_WIFI_REMOTE_AP_SSID
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+#define EXAMPLE_ESP_WIFI_STA_PASSWD CONFIG_ESP_WIFI_REMOTE_AP_PASSWORD
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+#define EXAMPLE_ESP_MAXIMUM_RETRY CONFIG_ESP_MAXIMUM_STA_RETRY
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+
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+#if CONFIG_ESP_WIFI_AUTH_OPEN
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_OPEN
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+#elif CONFIG_ESP_WIFI_AUTH_WEP
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WEP
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+#elif CONFIG_ESP_WIFI_AUTH_WPA_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WPA_PSK
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+#elif CONFIG_ESP_WIFI_AUTH_WPA2_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WPA2_PSK
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+#elif CONFIG_ESP_WIFI_AUTH_WPA_WPA2_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WPA_WPA2_PSK
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+#elif CONFIG_ESP_WIFI_AUTH_WPA3_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WPA3_PSK
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+#elif CONFIG_ESP_WIFI_AUTH_WPA2_WPA3_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WPA2_WPA3_PSK
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+#elif CONFIG_ESP_WIFI_AUTH_WAPI_PSK
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+#define ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD WIFI_AUTH_WAPI_PSK
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+#endif
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+
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+/* AP Configuration */
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+#define EXAMPLE_ESP_WIFI_AP_SSID CONFIG_ESP_WIFI_AP_SSID
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+#define EXAMPLE_ESP_WIFI_AP_PASSWD CONFIG_ESP_WIFI_AP_PASSWORD
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+#define EXAMPLE_ESP_WIFI_CHANNEL CONFIG_ESP_WIFI_AP_CHANNEL
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+#define EXAMPLE_MAX_STA_CONN CONFIG_ESP_MAX_STA_CONN_AP
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+
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+
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+/* The event group allows multiple bits for each event, but we only care about two events:
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+ * - we are connected to the AP with an IP
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+ * - we failed to connect after the maximum amount of retries */
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+#define WIFI_CONNECTED_BIT BIT0
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+#define WIFI_FAIL_BIT BIT1
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+
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+static const char *TAG_AP = "WiFi SoftAP";
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+static const char *TAG_STA = "WiFi Sta";
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+
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+static int s_retry_num = 0;
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+
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+/* FreeRTOS event group to signal when we are connected/disconnected */
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+static EventGroupHandle_t s_wifi_event_group;
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+
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+static void wifi_event_handler(void *arg, esp_event_base_t event_base,
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+ int32_t event_id, void *event_data)
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+{
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+ if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STACONNECTED) {
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+ wifi_event_ap_staconnected_t *event = (wifi_event_ap_staconnected_t *) event_data;
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+ ESP_LOGI(TAG_AP, "Station "MACSTR" joined, AID=%d",
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+ MAC2STR(event->mac), event->aid);
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+ } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STADISCONNECTED) {
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+ wifi_event_ap_stadisconnected_t *event = (wifi_event_ap_stadisconnected_t *) event_data;
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+ ESP_LOGI(TAG_AP, "Station "MACSTR" left, AID=%d",
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+ MAC2STR(event->mac), event->aid);
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+ } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
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+ esp_wifi_connect();
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+ ESP_LOGI(TAG_STA, "Station started");
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+ } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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+ ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data;
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+ ESP_LOGI(TAG_STA, "Got IP:" IPSTR, IP2STR(&event->ip_info.ip));
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+ s_retry_num = 0;
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+ xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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+ }
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+}
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+
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+/* Initialize soft AP */
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+esp_netif_t *wifi_init_softap(void)
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+{
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+ esp_netif_t *esp_netif_ap = esp_netif_create_default_wifi_ap();
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+
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+ wifi_config_t wifi_ap_config = {
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+ .ap = {
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+ .ssid = EXAMPLE_ESP_WIFI_AP_SSID,
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+ .ssid_len = strlen(EXAMPLE_ESP_WIFI_AP_SSID),
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+ .channel = EXAMPLE_ESP_WIFI_CHANNEL,
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+ .password = EXAMPLE_ESP_WIFI_AP_PASSWD,
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+ .max_connection = EXAMPLE_MAX_STA_CONN,
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+ .authmode = WIFI_AUTH_WPA2_PSK,
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+ .pmf_cfg = {
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+ .required = false,
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+ },
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+ },
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+ };
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+
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+ if (strlen(EXAMPLE_ESP_WIFI_AP_PASSWD) == 0) {
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+ wifi_ap_config.ap.authmode = WIFI_AUTH_OPEN;
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+ }
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+
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+ ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_ap_config));
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+
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+ ESP_LOGI(TAG_AP, "wifi_init_softap finished. SSID:%s password:%s channel:%d",
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+ EXAMPLE_ESP_WIFI_AP_SSID, EXAMPLE_ESP_WIFI_AP_PASSWD, EXAMPLE_ESP_WIFI_CHANNEL);
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+
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+ return esp_netif_ap;
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+}
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+
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+/* Initialize wifi station */
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+esp_netif_t *wifi_init_sta(void)
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+{
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+ esp_netif_t *esp_netif_sta = esp_netif_create_default_wifi_sta();
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+
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+ wifi_config_t wifi_sta_config = {
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+ .sta = {
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+ .ssid = EXAMPLE_ESP_WIFI_STA_SSID,
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+ .password = EXAMPLE_ESP_WIFI_STA_PASSWD,
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+ .scan_method = WIFI_ALL_CHANNEL_SCAN,
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+ .failure_retry_cnt = EXAMPLE_ESP_MAXIMUM_RETRY,
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+ /* Authmode threshold resets to WPA2 as default if password matches WPA2 standards (pasword len => 8).
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+ * If you want to connect the device to deprecated WEP/WPA networks, Please set the threshold value
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+ * to WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK and set the password with length and format matching to
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+ * WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK standards.
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+ */
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+ .threshold.authmode = ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD,
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+ .sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
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+ },
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+ };
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+
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+ ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_sta_config) );
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+
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+ ESP_LOGI(TAG_STA, "wifi_init_sta finished.");
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+
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+ return esp_netif_sta;
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+}
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+
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+void app_main(void)
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+{
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+ ESP_ERROR_CHECK(esp_netif_init());
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+ ESP_ERROR_CHECK(esp_event_loop_create_default());
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+
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+ //Initialize NVS
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+ esp_err_t ret = nvs_flash_init();
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+ if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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+ ESP_ERROR_CHECK(nvs_flash_erase());
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+ ret = nvs_flash_init();
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+ }
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+ ESP_ERROR_CHECK(ret);
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+
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+ /* Initialize event group */
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+ s_wifi_event_group = xEventGroupCreate();
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+
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+ /* Register Event handler */
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+ ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
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+ ESP_EVENT_ANY_ID,
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+ &wifi_event_handler,
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+ NULL,
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+ NULL));
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+ ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
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+ IP_EVENT_STA_GOT_IP,
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+ &wifi_event_handler,
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+ NULL,
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+ NULL));
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+
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+ /*Initialize WiFi */
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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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+
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+ ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_APSTA));
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+
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+ /* Initialize AP */
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+ ESP_LOGI(TAG_AP, "ESP_WIFI_MODE_AP");
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+ esp_netif_t *esp_netif_ap = wifi_init_softap();
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+
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+ /* Initialize STA */
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+ ESP_LOGI(TAG_STA, "ESP_WIFI_MODE_STA");
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+ esp_netif_t *esp_netif_sta = wifi_init_sta();
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+
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+ /* Start WiFi */
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+ ESP_ERROR_CHECK(esp_wifi_start() );
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+
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+ /*
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+ * Wait until either the connection is established (WIFI_CONNECTED_BIT) or
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+ * connection failed for the maximum number of re-tries (WIFI_FAIL_BIT).
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+ * The bits are set by event_handler() (see above)
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+ */
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+ EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
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+ WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
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+ pdFALSE,
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+ pdFALSE,
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+ portMAX_DELAY);
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+
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+ /* xEventGroupWaitBits() returns the bits before the call returned,
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+ * hence we can test which event actually happened. */
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+ if (bits & WIFI_CONNECTED_BIT) {
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+ ESP_LOGI(TAG_STA, "connected to ap SSID:%s password:%s",
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+ EXAMPLE_ESP_WIFI_STA_SSID, EXAMPLE_ESP_WIFI_STA_PASSWD);
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+ } else if (bits & WIFI_FAIL_BIT) {
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+ ESP_LOGI(TAG_STA, "Failed to connect to SSID:%s, password:%s",
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+ EXAMPLE_ESP_WIFI_STA_SSID, EXAMPLE_ESP_WIFI_STA_PASSWD);
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+ } else {
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+ ESP_LOGE(TAG_STA, "UNEXPECTED EVENT");
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+ return;
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+ }
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+
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+ /* Set sta as the default interface */
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+ esp_netif_set_default_netif(esp_netif_sta);
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+
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+ /* Enable napt on the AP netif */
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+ if (esp_netif_napt_enable(esp_netif_ap) != ESP_OK) {
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+ ESP_LOGE(TAG_STA, "NAPT not enabled on the netif: %p", esp_netif_ap);
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+ }
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+}
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Abhik Roy