TODO

• the simple counting of how many packets got CE vs. how many
  were there, in total, is possibly much too naïve, at least
  the sizes are needed if not timestamping with in-flight calc

• Android 11 strict mode prüfen, falls möglich

• Warnungen:
  – restlichen Gradle-6-Warnungen:
    https://stackoverflow.com/q/65479693/2171120
  – Obsolete custom lint check:
    https://stackoverflow.com/q/65479506/2171120
    (temporarily worked around)

• com.android.tools.build:gradle:4.1.1 unbrauchbar:
  ‣ https://youtrack.jetbrains.com/issue/IDEA-252823
  ‣ https://youtrack.jetbrains.com/issue/IDEA-252775
  benötigt IDEA 2021.1, kein Backport auf 2020.x vorgesehen
• com.android.tools.build:gradle:4.0.2 unbrauchbar:
  ‣ https://youtrack.jetbrains.com/issue/IDEA-258598

• CodeQL vs. NDK
  https://stackoverflow.com/q/65480083/2171120

• OWASP plugin for Gradle
  https://github.com/jeremylong/dependency-check-gradle/issues/206

• Android/Unity
  – import the four generated shared objects into Unity, assigning
    Android support and the correct CPU to each, according to
    https://docs.unity3d.com/Manual/AndroidNativePlugins.html
    ‣ maybe we can just import the AAR instead?
  – Unity should not (currently) use stackalloc, apparently it’s
    problematic in its VM; use #ifdef to heap-allocate (maybe use
    a pool?) only on Unity, keeping stackalloc in proper .net/CLR?
  – now [DllImport("ecn-bitw")] “should just work”, let’s hope it
    selects the correct .so according to what platform it’s running on
  - numerical	SocketFlags		flags
	2	OutOfBand		MSG_OOB
	1	Peek			MSG_PEEK
  - Span<byte> bytes = stackalloc byte[length];
  - ReadOnlySpan<int> span = new int[bufferSize];
    fixed (int* ptr = &MemoryMarshal.GetReference(span)) {
        return Native.Sum(Unsafe.AsRef<int>(ptr), (UIntPtr)span.Length);
    }
 vs fixed (int* ptr = span) {
        return Native.Sum(ptr, span.Length);
  - receive(0) → receive(1,|MSG_PEEK,&dummy_buf)
  – Unity: might need to copy out built DLLs to Unity directory
    structure, probably keep it there even through (n)make clean