I have a problem with ROUTER-ROUTER communication with NetMQ.
Two applications, Client and Server. Both using ROUTER sockets. Client ROUTER socket is not setting it's identity explicitly, only Server.
After the connection established first time, messages are routed from client (ROUTER) to server (ROUTER). But as soon as client calls Disconnect() and then Connect() again (after a very short time, i.e. 10 msec), the server is not receiving messages any more.
What is interesting, that reconnection works fine if ZeroMq C# lib is used.
Is it a known issue or I'm doing something wrong here?
Minimal code to reproduce the issue:
public class PureNetMQ
{
private static readonly byte[] ServerIdentity = {1, 2, 3};
private static readonly byte[] ClientIdentity = {1, 2, 4};
private static readonly string Address = "tcp://127.0.0.1:5000";
private static void Main(string[] args)
{
var cancellationTokenSource = new CancellationTokenSource();
Task.Factory.StartNew(_ => RunServer(cancellationTokenSource.Token), cancellationTokenSource.Token, TaskCreationOptions.LongRunning);
Thread.Sleep(TimeSpan.FromSeconds(2));
RunClient();
Console.WriteLine("Done");
Console.ReadLine();
cancellationTokenSource.Cancel(true);
}
private static void RunClient()
{
using (var context = NetMQContext.Create())
{
using (NetMQSocket socket = context.CreateRouterSocket())
{
//socket.Options.Identity = Guid.NewGuid().ToByteArray();
//socket.Options.RouterMandatory = true;
socket.Options.Linger = TimeSpan.Zero;
socket.Connect(Address);
Thread.Sleep(TimeSpan.FromSeconds(2));
socket.SendMore(ServerIdentity);
socket.SendMore(Encoding.UTF8.GetBytes(""));
socket.Send(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString()));
Console.WriteLine("Message sent...");
socket.Disconnect(Address);
Thread.Sleep(TimeSpan.FromSeconds(5));
Console.WriteLine("Disconnected");
//socket.Options.Identity = Guid.NewGuid().ToByteArray();
socket.Connect(Address);
Thread.Sleep(TimeSpan.FromSeconds(5));
Console.WriteLine("Reconnected");
socket.SendMore(ServerIdentity);
socket.SendMore(Encoding.UTF8.GetBytes(""));
socket.Send(Encoding.UTF8.GetBytes(Guid.NewGuid().ToString()));
Console.WriteLine("Message sent...");
Thread.Sleep(TimeSpan.FromSeconds(5));
}
}
}
private static void RunServer(CancellationToken token)
{
using (var context = NetMQContext.Create())
{
using (var socket = context.CreateRouterSocket())
{
socket.Options.Identity = ServerIdentity;
//socket.Options.RouterMandatory = true;
socket.Options.Linger = TimeSpan.Zero;
socket.Bind(Address);
while (!token.IsCancellationRequested)
{
var message = socket.ReceiveMessage();
for (var i = 2; i < message.FrameCount; i++)
{
Console.WriteLine("Message: {0}", Encoding.UTF8.GetString(message[i].Buffer));
}
}
}
}
}
}
