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esp_err_t wifiInit(wifi_mode_t mode) {
    esp_err_t err = ESP_OK;
    do {
        // step 1 in https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/wifi.html:
        // Wifi/LwIP Init.
        // step 1.1: call esp_netif_init()
        err = esp_netif_init();
        if (err != ESP_OK) {
            ESP_LOGE(TAG, "wifiInit(): esp_netif_init() returned \"%s\".", esp_err_to_name(err));
            continue;
        }

        // step 1.2 
        // identify the event handler.
        err = esp_event_loop_create_default();
        if (err != ESP_OK) {
            ESP_LOGE(TAG, "wifiInit(): esp_event_loop_create_default() returned \"%s\".", esp_err_to_name(err));
            continue;
        }