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#include "esp_log.h"
#include "esp_wifi.h"
#include "freertos/event_groups.h"
#include "nvs_flash.h"
/* 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 const char *TAG = "wifi";
static int s_retry_num = 0;
static int s_retry_max = 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 < s_retry_max) {
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, "IP:" IPSTR, IP2STR(&event->ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
}
}
esp_err_t _wifi_deinit(void) { return esp_wifi_stop(); }
esp_err_t wifi_init(wifi_sta_config_t const *sta_config, uint8_t retries) {
esp_event_handler_instance_t instance_any_id;
esp_event_handler_instance_t instance_got_ip;
wifi_config_t wifi_config = {.sta = *sta_config};
s_retry_max = retries;
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_LOGI(TAG, "SSID: '%s'", sta_config->ssid);
ESP_LOGI(TAG, "PASS: '%s'", sta_config->password);
s_wifi_event_group = xEventGroupCreate();
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_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));
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());
/* 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");
return ESP_OK;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGI(TAG, "FAIL TO CONNECT");
return ESP_FAIL;
} else {
ESP_LOGE(TAG, "UNEXPECTED EVENT");
return ESP_FAIL;
}
}
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