Android Multicast socket stops listening

Question

I have a service on Android that listens and responds to packets it receives via multicast.

This works most of the time, but unfortunately, I\'m finding that every n

Answer 1

Note: This answer was meaningful when the question was asked in 2010, it is probably irrelevant today.

I would think that changing wireless networks is pretty much akin to disabling and re-enabling the network (likely with a different IP and routing), so no surprise that things break.

Perhaps registering for changes in the network info would give you the needed warning?

http://developer.android.com/reference/android/net/ConnectivityManager.html#CONNECTIVITY_ACTION

and associated pages

Answer 2

Are you acquiring a multicast lock?

WifiManager manager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
MulticastLock lock = manager.createMulticastLock("lock name");
lock.setReferenceCounted(true);
lock.acquire();

It also seems like certain devices block multicast:

Multicast on Android 2.2