CODEWITHSUNDEEP
c#windowsunity-game-engineudp
oferei
oferei

Reputation: 1828

Message-size error when trying to receive a small UDP packet

When I call Socket.ReceiveFrom I get the following exception:

System.Net.Sockets.SocketException: A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself.

However, I have only sent a packet with 118 bytes.

The code is quite simple: 

numBytesRead = udpSocket.ReceiveFrom(data, ref _udpRemoteEndPoint);

Where data is allocated to 1200 bytes.

What am I doing wrong?

It's worth mentioning that I get this error only when running on Windows - the code works well on my Mac.

A few more details: I am writing in C# code in Unity (game engine).
I have one TCP socket and one UDP socket open on each machine. I am using a Select loop to handle both in the same thread, so I call ReceiveFrom only after I know that data is available. I'm using TcpClient and UdpClient to create the sockets.

EDIT: This question is different because I'm not sending big packets. I don't suppose my 118-byte payload should overflow any internal buffer.

Upvotes: 1

Views: 6201

Answers (1)

G. Salvador
G. Salvador

Reputation: 11

You have to set enough space for the buffer: byte[] data = new byte[1024];

Also the call is made this way: udpSocket.EndReceiveFrom(ar, ref _udpRemoteEndPoint); where ar is IAsyscResult type.

Upvotes: 1

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