[/#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event_loop.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "lwip/err.h"
#include "lwip/sys.h"
#define EXAMPLE_ESP_WIFI_SSID CONFIG_ESP_WIFI_SSID
#define EXAMPLE_ESP_WIFI_PASS CONFIG_ESP_WIFI_PASSWORD
#define EXAMPLE_ESP_MAXIMUM_RETRY CONFIG_ESP_MAXIMUM_RETRY
static EventGroupHandle_t s_wifi_event_group;
const int WIFI_CONNECTED_BIT = BIT0;
static const char *TAG = "wifi station";
static int s_retry_num = 0;
static void check_status()
{
EventBits_t uxBits;
uxBits = xEventGroupGetBits(s_wifi_event_group);
if(uxBits & WIFI_CONNECTED_BIT)
{
printf ("wifi connected\n");
}
else if (!(uxBits & WIFI_CONNECTED_BIT))
{
printf ("wifi disconnected\n");
}
}
static esp_err_t event_handler(void *ctx, system_event_t *event)
{
switch(event->event_id)
{
case SYSTEM_EVENT_STA_START:
esp_wifi_connect();
break;
case SYSTEM_EVENT_STA_GOT_IP:
ESP_LOGI(TAG, "got ip:%s",
ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
check_status(); // To update the wifi status
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
{
esp_wifi_connect();
xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
check_status(); // To update the wifi status
break;
}
default:
break;
}
return ESP_OK;
}
void wifi_init_sta()
{
s_wifi_event_group = xEventGroupCreate();
tcpip_adapter_init();
ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
wifi_config_t wifi_config = {
.sta = {
.ssid = EXAMPLE_ESP_WIFI_SSID,
.password = EXAMPLE_ESP_WIFI_PASS
},
};
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
ESP_ERROR_CHECK(esp_wifi_start() );
ESP_LOGI(TAG, "wifi_init_sta finished.");
ESP_LOGI(TAG, "connect to ap SSID:%s password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
}
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");
wifi_init_sta();
}]