ZBeacon Doesn't Ignore It's Own Beacons

The following code will every second print out:

/192.168.1.109
127.0.1.1
ZRE
�

Ie. its own beacon, despite this version of the constructor telling it to ignore its own beacons:

import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZContext;
import org.zeromq.ZBeacon;
import org.zeromq.ZBeacon.Listener;
import java.net.InetAddress;

public class zmq_test
{
    public static void main( String[] args )
    {
        try{
           zmq_test a = new zmq_test();
           a.run();
        }
        catch(Exception e){}
    }

    private Remote remote;
    private Thread service;

    public void run() {
        remote = new Remote();
        service = new Thread(remote);
        service.start();
    }

    public class Remote implements Runnable {
        private volatile boolean running = true;
        public Remote() {  }

        private byte[] make_beacon_message(int port) {
            //zre protocol
            byte msg[] = new byte[] { 'Z', 'R', 'E', '\1', '\0', '\0', '\0', '\0', '\0', '\0',
                                      '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
                                      (byte)((port >> 8) & 0xFF), (byte)(port & 0xFF) };
            return msg;
        }

        public void abort() {
            running = false;
        }

        public void run() {
            //random port in suggested IANA range
            ZContext context = new ZContext();
            Socket service = context.createSocket(ZMQ.REP);
            int port = service.bindToRandomPort("tcp://*", 49152, 65535);
            //beacon for service discovery on reserved zre discovery port
            byte[] msg = make_beacon_message(port);
            ZBeacon beacon = new ZBeacon("255.255.255.255", 5670, msg, true);
            beacon.setPrefix(new byte[]{'Z', 'R', 'E', 0x01});
            beacon.setListener(new Listener() {
                @Override
                public void onBeacon(InetAddress sender, byte[] beacon) {
                    System.out.println(sender.toString());
                    try{
                        System.out.println(InetAddress.getLocalHost().getHostAddress());}
                    catch(Exception e){}
                    System.out.println(new String(beacon));
                }
            });
            beacon.start();
            //listen for requests
            while(running) {
                byte[] bytes = service.recv();
                if(bytes != null) {
                    //TODO:
                }
            }
            try { beacon.stop(); } catch (Exception e){}
            service.close();
            context.close();
        }
    }

}

Indeed stepping through with the debugger one can see that this line:

https://github.com/zeromq/jeromq/blob/master/src/main/java/org/zeromq/ZBeacon.java#L211

Turns out to be false because usually you’ll get something like 127.0.0.1 out of InetAddress.getLocalHost().getHostAddress() where as the senderAddress.getHostAddress() will be what you might see in ifconfig ie. 192.168.1.107 or something.

[daveyarwood]

Alright – closing for now. We can always reopen this issue if it is found to still be a problem now.

[kevinkreiser]

@daveyarwood im happy if you want to close this issue. i worked around it and havent tried it without the work around since. its very possible that at this point i no longer need the work around so please dont hold the issue open on my account!