Gadgetbridge/app/src/main/res/xml/devicesettings_high_mtu.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <SwitchPreference
        android:icon="@drawable/ic_mtu"
        android:defaultValue="false"
        android:key="allow_high_mtu"
        android:summary="@string/pref_summary_allow_high_mtu"
        android:title="@string/pref_title_allow_high_mtu" />
</androidx.preference.PreferenceScreen>