DotNetty UDP problem.

[Seto1]

The DotNetty TCP is working correctly for my previous apps.
I tried UDP these days. And I found that it’s not working correctly in Unity.

It’s working correctly in normal console app of C#. But it’s not working with Unity. The DotNetty code is included with .cs files for easily debugging. The case number is 1223903.

System.Net.Sockets.SocketException (0x80004005): The system detected an invalid pointer address in attempting to use a pointer argument in a call.

at System.Net.Sockets.Socket.SendTo (System.Byte[ ] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP) [0x00082] in :0
at DotNetty.Transport.Channels.Sockets.SocketDatagramChannel.DoWriteMessage (System.Object msg, DotNetty.Transport.Channels.ChannelOutboundBuffer input) [0x00083] in D:\Seto\UnityBug\Assets\DotNetty\DotNetty.Transport\Channels\Sockets\SocketDatagramChannel.cs:245
at DotNetty.Transport.Channels.Sockets.AbstractSocketMessageChannel.DoWrite (DotNetty.Transport.Channels.ChannelOutboundBuffer input) [0x00031] in D:\Seto\UnityBug\Assets\DotNetty\DotNetty.Transport\Channels\Sockets\AbstractSocketMessageChannel.cs:143
— End of stack trace from previous location where exception was thrown —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <437ba245d8404784b9fbab9b439ac908>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <437ba245d8404784b9fbab9b439ac908>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <437ba245d8404784b9fbab9b439ac908>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <437ba245d8404784b9fbab9b439ac908>:0
at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <437ba245d8404784b9fbab9b439ac908>:0
at UnityBug+d__3.MoveNext () [0x0019b] in D:\Seto\UnityBug\Assets\UnityBug.cs:55
UnityEngine.Debug:LogError(Object)
d__3:MoveNext() (at Assets/UnityBug.cs:69)
UnityEngine.UnitySynchronizationContext:ExecuteTasks()

[Seto1]

.Channel<SocketDatagramChannel>()

I changed this to the code below to limit it to ipv4. It will work. Does it mean that Unity is incompatible with ipv6?

.ChannelFactory(() => new SocketDatagramChannel(AddressFamily.InterNetwork))

[Seto1]

It’s working correctly with the normal C# Console App. Both are run in Windows 10 x64. But the normal C# Console App is working. In Unity, it’s not. So I think it’s a bug of Mono from Unity.
https://github.com/SetoKaiba/ConsoleApplication1
Here’s the code and the binary in ConsoleApplication1\bin\Debug\ConsoleApplication1.exe. Run and wait. You will see that the error won’t occur with normal C# Console App. So it’s absolutely a bug of Unity.