ESP32 Forum

Q : I don't know what is wrong with my code i took it from the esp32 wifi station examples and it does not work and keep in mind that my SSID is hidden does this make a change? I'm using an esp32-wroom-32d dev board.

- Note : in the main code in my pc i replaced ther EXAMPLE_ESP_WIFI_SSID with my real SSID and EXAMPLE_ESP_WIFI_PASS with the real password

Github Repo : https://github.com/espressif/esp-idf/bl ... ple_main.c

My Code :-
CMakeLists.txt
--------------------
# See the build system documentation in IDF programming guide
# for more information about component CMakeLists.txt files.

idf_component_register(
SRCS main.c # list the source files of this component
INCLUDE_DIRS "." # optional, add here public include directories
PRIV_INCLUDE_DIRS # optional, add here private include directories
REQUIRES esp_adc esp_wifi nvs_flash mqtt# optional, list the public requirements (component names)
)

main.c
--------------
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_wifi.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "mqtt_client.h"
#include "lwip/err.h"
#include "lwip/sys.h"

#define EXAMPLE_ESP_WIFI_SSID "MY_SSID"
#define EXAMPLE_ESP_WIFI_PASS "MYPASSWORD"
#define EXAMPLE_ESP_MAXIMUM_RETRY 3

/* 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 station";

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 < EXAMPLE_ESP_MAXIMUM_RETRY) {
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, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
}
}

void wifi_init_sta(void)
{
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));
ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT,
ESP_EVENT_ANY_ID,
instance_any_id));

ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT,
IP_EVENT_STA_GOT_IP,
instance_got_ip));

wifi_config_t wifi_config = {
.sta = {
.ssid = EXAMPLE_ESP_WIFI_SSID,
.password = EXAMPLE_ESP_WIFI_PASS,
.threshold.authmode = WIFI_AUTH_WPA2_PSK,
.sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
},
};
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() );

ESP_LOGI(TAG, "wifi_init_sta finished.");

/* 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 to ap SSID:%s password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
} else {
ESP_LOGI(TAG, "UNEXPECTED EVENT");
}
}

void app_main(void)
{
//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();
}