Function get_efuse_mac_as_string

src/settings.cpp:467–476

    setBrightness(bright, false);
}
String get_efuse_mac_as_string() {
    uint8_t mac[6] = {0};
    String str = "";
    esp_efuse_mac_get_default(mac);
    for (int i = 0; i < 6; i++) {
        if (i > 0) str += ":";
        str += String(mac[i], 16);
    }
    return str;
}
bool config_exists() {
    if (!SDM.exists(CONFIG_FILE)) {
        File conf = SDM.open(CONFIG_FILE, FILE_WRITE, true);