wifi.c

#include "wifi.h"

#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.h"
#include "esp_log.h"

#include "lwip/err.h"
#include "lwip/sys.h"

wifi_connection_t* g_connections = NULL;
uint8_t g_connections_len = 0;

/* The examples use WiFi configuration that you can set via project configuration menu
   If you'd rather not, just change the below entries to strings with
   the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
*/
#define EXAMPLE_ESP_WIFI_SSID      "brisa-2816643"
#define EXAMPLE_ESP_WIFI_PASS      "9oqgl1e0"
#define EXAMPLE_ESP_MAXIMUM_RETRY  2

/* 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)
{   
    ESP_LOGI(TAG, "retries %d", s_retry_num);

    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));
    
    
    
    wifi_config_t wifi_config = {
        .sta = {
            .ssid = "SSID",
            .password = "password",
            /* Authmode threshold resets to WPA2 as default if password matches WPA2 standards (pasword len => 8).
             * If you want to connect the device to deprecated WEP/WPA networks, Please set the threshold value
             * to WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK and set the password with length and format matching to
	     * WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK standards.
             */
            .threshold.authmode = WIFI_AUTH_WPA2_PSK,
            .sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
        },
    };
    ESP_LOGI(TAG, "connections %d", g_connections_len);
    for (int c = 0; c < g_connections_len; c++)
    {
        

        memcpy(wifi_config.sta.ssid, g_connections[c].ssid, 32);
        memcpy(wifi_config.sta.password, g_connections[c].password, 64);

        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, " waiting...");

        /* 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) */
        s_retry_num = 0;
        EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
                WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
                pdFALSE,
                pdFALSE,
                portMAX_DELAY);
        ESP_LOGI(TAG, "wifi_init_sta finished.");


        if (bits & WIFI_CONNECTED_BIT) {
            ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
                    EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
            return;
        } else if (bits & WIFI_FAIL_BIT) {
            ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
                    wifi_config.sta.ssid, wifi_config.sta.password);
        } else {
            ESP_LOGE(TAG, "UNEXPECTED EVENT");
        }
    }
    ESP_LOGI(TAG, "EXIT");
}


void wifi_register_connection(wifi_connection_t conn)
{
    if(!g_connections_len)
        g_connections = (wifi_connection_t*)malloc(sizeof(wifi_connection_t));
    else
        g_connections = (wifi_connection_t*)realloc(g_connections, sizeof(wifi_connection_t)*(g_connections_len+1));
    g_connections[g_connections_len] = conn;
    g_connections_len++;
}