JmDNS: Can't resolve service

Question

I\'m trying to implement JmDNS discovery for communication between an Android app and a desktop application. I have followed the following tutorial: http://home.heeere.com/tech-

Answer 1

Use JmDNS.create(InetAddress addr, String name) instead of JmDNS.create(). In more recent versions of Android, JmDNS needs to know more about the local device and the network interface it is listening on.

JmDNS jmdns; // somewhere global

// In a background thread 
public void buildJmDNS() {
    InetAddress addr = InetAddress.getLocalHost();
    String hostname = InetAddress.getByName(addr.getHostName()).toString();
    try {
        jmdns = JmDNS.create(addr, hostname); // throws IOException
    } catch (IOException e) {
       e.printStackTrace(); // handle this if you want
    }
}

I had the same issue you are experiencing and this solved it for me. I have tried to find the example I had found that shows why this is necessary, but I cannot.

Answer 2

Checking out the latest source code version from the github repository did the trick. Discovering the service now works just fine on all devices. (Note: I was using JmDNS version 3.4.1 which I had downloaded from sourceforge before)

Having skimmed through the SVN history, there seem to be a couple of commits related to problems with resolving services since the 3.4.1 release.

Edit: Replaced svn with github repository since jmdns has moved there.