I'm trying to implement JMDNS in an Android app. Here's the relevant code:
...
jmDNS = JmDNS.create(myaddr);
HashMap props= new HashMap();
props.put(PROP_USER_NAME,userName);
props.put(PROP_USER_ID,userId);
ServiceInfo serviceInfo = ServiceInfo.create(SERVICE_TYPE,originalServiceName,port,0,0,true,props);
jmDNS.registerService(serviceInfo);
jmDNS.addServiceListener(SERVICE_TYPE, mdnsServiceListener = new ServiceListener() {
public void serviceAdded (ServiceEvent serviceEvent){
jmDNS.requestServiceInfo(serviceEvent.getType(), serviceEvent.getName(), true);
}
public void serviceRemoved (ServiceEvent serviceEvent){
Log.i(TAG, "A service was removed");
//Log.i(TAG,"NAME "+serviceEvent.getInfo().getPropertyString(PROP_USER_ID) + serviceEvent.getInfo().getPropertyString(PROP_USER_NAME));
// Test service is disappeared.
}
public void serviceResolved (ServiceEvent serviceEvent){
// Test service info is resolved.
Log.i(TAG, "A service was resolved");
ServiceInfo serviceInfo = serviceEvent.getInfo();
Log.i(TAG, "NAME" + serviceInfo.getName());
Log.i(TAG, "user_name" + serviceInfo.getPropertyString(PROP_USER_NAME));
}
});
So far, I'm running into several issues:
- Service discovery by other devices is not consistent. Sometimes discovery works, sometimes it doesn't. Sometimes it works at first but stops after a while.
Receiving updated txt record information is also very inconsistent. This is very recurrent. The process to update the TXT in a service is the following is:
jmDNS.unregisterAllServices(); jmDNS.removeServiceListener(SERVICE_TYPE, mdnsServiceListener);
And then i start the registration process all over again. The problem is that other devices detect the new service with serviceResolved but the txt record is still outdated.
