static esp_err_t event_handler(void *ctx, system_event_t *event)
{
    /* For accessing reason codes in case of disconnection */
    system_event_info_t *info = &event->event_info;

    switch(event->event_id) {
        case SYSTEM_EVENT_WIFI_READY:
            ESP_LOGI(LOG_TAG, "Wifi is primed and ready!");
            break;

        case SYSTEM_EVENT_STA_START:
            ESP_LOGI(LOG_TAG, "Wifi station started");
            scan_for_ap();
            break;

        case SYSTEM_EVENT_SCAN_DONE:
            ESP_LOGI(LOG_TAG, "Scan Completed Successfully.");
            list_ap();
            break;

        default:
            ESP_LOGI(LOG_TAG, "Some other event %d", event->event_id);
            break;

    }

    return ESP_OK;
}