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/*
* SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: CC0-1.0
*/
#include <string.h>
#include "esp_event.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "freertos/FreeRTOS.h"
#include "freertos/event_groups.h"
#include "freertos/task.h"
#include "nvs_flash.h"
#include "lwip/err.h"
#include "lwip/sys.h"
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 < 3) {
esp_wifi_connect();
s_retry_num++;
printf("retry to connect to the AP\n");
} else {
xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
}
printf("connect to the AP fail\n");
} 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;
printf("IP ADDRESS:" IPSTR "\n", IP2STR(&event->ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
}
}
void wifi_init(const char *ssid, const char *pass) {
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);
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 c = {.sta = {.threshold = {.authmode = WIFI_AUTH_WPA2_PSK},
.pmf_cfg = {.capable = true, .required = false}}};
snprintf((char *) c.sta.ssid, sizeof(c.sta.ssid), "%s", ssid);
snprintf((char *) c.sta.password, sizeof(c.sta.password), "%s", pass);
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &c));
ESP_ERROR_CHECK(esp_wifi_start());
printf("wifi_init_sta finished.\n");
EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
pdFALSE, pdFALSE, portMAX_DELAY);
if (bits & WIFI_CONNECTED_BIT) {
printf("connected to ap SSID:%s password:%s\n", ssid, pass);
} else if (bits & WIFI_FAIL_BIT) {
printf("Failed to connect to SSID:%s, password:%s\n", ssid, pass);
} else {
printf("UNEXPECTED EVENT\n");
}
/* The event will not be processed after unregister */
ESP_ERROR_CHECK(esp_event_handler_instance_unregister(
IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
ESP_ERROR_CHECK(esp_event_handler_instance_unregister(
WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
vEventGroupDelete(s_wifi_event_group);
}
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