public static void Send(this UdpConnection connection, MessageWriter msg, Action ackCallback)
{
if (msg.SendOption != SendOption.Reliable)
{
throw new InvalidOperationException("Message SendOption has to be Reliable.");
}
var buffer = new byte[msg.Length];
Buffer.BlockCopy(msg.Buffer, 0, buffer, 0, msg.Length);
connection.ResetKeepAliveTimer();
connection.AttachReliableID(buffer, 1, ackCallback);
connection.WriteBytesToConnection(buffer, buffer.Length);
connection.Statistics.LogReliableSend(buffer.Length - 3, buffer.Length);
}