esp_lib_wifi.c

#include <string.h>

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"

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

#include "esp_event.h"

#include "esp_log.h"
#include "esp_system.h"
#include "nvs_flash.h"

#include "esp_lib_wifi.h"

#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT BIT1

static EventGroupHandle_t s_wifi_event_group;

static const char *TAG = "Network";
static int s_retry_num = 0;

bool w_status = false;

static void event_handler_st(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 < 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");
        w_status = false;
    }
    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);
        w_status = true;
    }
}

static void event_handler_ap(void *arg, esp_event_base_t event_base,
                               int32_t event_id, void *event_data)
{
    if (event_id == WIFI_EVENT_AP_STACONNECTED)
    {
        wifi_event_ap_staconnected_t *event = (wifi_event_ap_staconnected_t *)event_data;
        ESP_LOGI(TAG, "station " MACSTR " join, AID=%d",
                 MAC2STR(event->mac), event->aid);
    }
    else if (event_id == WIFI_EVENT_AP_STADISCONNECTED)
    {
        wifi_event_ap_stadisconnected_t *event = (wifi_event_ap_stadisconnected_t *)event_data;
        ESP_LOGI(TAG, "station " MACSTR " leave, AID=%d",
                 MAC2STR(event->mac), event->aid);
    }
}

void init_wifi_sta(char *ssid, char *pass)
{
    s_wifi_event_group = xEventGroupCreate();
    ESP_ERROR_CHECK(esp_event_loop_create_default());

    ESP_ERROR_CHECK(esp_netif_init());
    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_st,
                                                        NULL,
                                                        &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
                                                        IP_EVENT_STA_GOT_IP,
                                                        &event_handler_st,
                                                        NULL,
                                                        &instance_got_ip));

    wifi_config_t wifi_config = {
        .sta = {
            .ssid = {0},
            .password = {0},
            /* 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,
        },
    };
    strcpy((char *)wifi_config.sta.ssid, ssid);
    strcpy((char *)wifi_config.sta.password, pass);

    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",
                 ssid, pass);
    }
    else if (bits & WIFI_FAIL_BIT)
    {
        ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
                 ssid, pass);
    }
    else
    {
        ESP_LOGE(TAG, "UNEXPECTED EVENT");
    }
}

void init_wifi_ap()
{
    ESP_ERROR_CHECK(esp_netif_init());
    ESP_ERROR_CHECK(esp_event_loop_create_default());
    esp_netif_create_default_wifi_ap();

    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_ap,
                                                        NULL,
                                                        NULL));
    wifi_config_t wifi_config = {
        .ap = {
            .ssid = DEFAULT_AP_SSID,
            .ssid_len = strlen(DEFAULT_AP_SSID),
            .channel = 1,
            .password = DEFAULT_AP_PASS,
            .max_connection = 4,
            .authmode = WIFI_AUTH_WPA_WPA2_PSK,
            .pmf_cfg = {
                    .required = false,
            },
        },
    };
    if (strlen(DEFAULT_AP_PASS) == 0) {
        wifi_config.ap.authmode = WIFI_AUTH_OPEN;
    }

    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
    ESP_ERROR_CHECK(esp_wifi_start());

    // esp_netif_ip_info_t ip_info;
    // esp_netif_get_ip_info(esp_netif_get_handle_from_ifkey("WIFI_AP_DEF"), &ip_info);

    // char ip_addr[16];
    // inet_ntoa_r(ip_info.ip.addr, ip_addr, 16);
    // ESP_LOGI(TAG, "Set up softAP with IP: %s", ip_addr);

    // ESP_LOGI(TAG, "wifi_init_softap finished. SSID:'%s' password:'%s'",
    //          EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);

    ESP_LOGI(TAG, "wifi_init_softap finished. SSID:%s password:%s channel:%d",
             DEFAULT_AP_SSID, DEFAULT_AP_PASS, 1);
}

bool get_wifi_status()
{
    return w_status;
}