How do I get nanomsg to automatically reconnect reliably?

I am having problems with re-creating where the server goes down for a short time or shuts down completely and then comes back. I cannot get my clients to automatically reconnect. Also, there is no property anywhere where I can see the state of the socket (is the socket disconnected?) So that I can manually reconnect. What am I missing?

According to nanomsg documentation , there is a reconnect interval called NN_RECONNECT_IVL

. I can't seem to get it to work. Consider the following:

I have a working nanomsg server:

nanocat --bind-local 1234 --bus --interval 1 --ascii --data "hello world"

      

        
        
        
      

    

Then I attach to it:

nanocat --connect-local 1234 -A --bus

      

        
        
        
      

    

and I see:

hello world
hello world
hello world

      

        
        
        
      

    

Then I remove the server and restart it, and the nanokat does not automatically connect automatically. Maybe where I am missing?

Then I built a client in C # using NNanomsg:

class Program
{
    static void Main(string[] args)
    {
        NNanomsg.NanomsgSocket s = new NNanomsg.NanomsgSocket(NNanomsg.Domain.SP, NNanomsg.Protocol.BUS);

        // doesn't seem to do anything
        s.Options.ReconnectInterval = new TimeSpan(0, 0, 5);

        var e = s.Connect("tcp://127.0.0.1:1234");

        while (true)
        {
            byte[] ddd;
            ddd = s.ReceiveImmediate();
            if (ddd != null)
            {
                string m = UTF8Encoding.UTF8.GetString(ddd);
                Console.WriteLine(m);
            }
            else
            {
                // don't peg the CPU
                Thread.Sleep(100);
            }
        }
    }
}

      

        
        
        
      

    

and I see:

hello world
hello world
hello world

      

        
        
        
      

    

Then I remove the server and restart it and my C # client doesn't connect automatically. Maybe where I am missing?

Then I built the client in c:

#include <nanomsg/nn.h>
#include <nanomsg/bus.h>

int _tmain(int argc, _TCHAR* argv[])
{
    int sock;
    int recv;
    int reconnect_interval;
    char *buf;

    buf = NULL;
    reconnect_interval = 5;

    sock = nn_socket (AF_SP, NN_BUS);

    nn_setsockopt(sock, NN_SOL_SOCKET , NN_RECONNECT_IVL, &reconnect_interval, sizeof(reconnect_interval));

    nn_connect(sock, "tcp://127.0.0.1:1234");

    while(1 == 1)
    {
        recv = nn_recv(sock, &buf, NN_MSG, 0);
        if(recv > 0)
        {
            printf("%s\r\n", buf);
            nn_freemsg (buf);
        }
    }

    return 0;
}

      

        
        
        
      

    

and I see:

hello world²²²²½½½½½½½½■ε■ε■
hello world²²²²½½½½½½½½■ε■ε■
hello world²²²²½½½½½½½½■ε■ε■

      

        
        
        
      

    

(Crash because I think nanomsg does not initialize the buffer and I am lazy using printf)

Then I remove the server and restart it and my C client doesn't connect automatically.

What am I missing?

Note: I've experimented with setting the socket option before as well as after nn_connect()

and s.Connect

. Not.