Thanks Erel, will take a look at this very soon.
Debating whether to pursue that side quickly this weekend in readiness if a quick diversion or continue on the path of getting the app done for Android first. I suppose the question I'm asking, would it be fairly quick to adapt/put in place or does it need a little more work compared to the method in place on the the B4J to GCM side? The iOS side I'd want to move onto promptly once the droid side is in a good testing area with friends, as others eager with iOS devices to play too. (It's a unique card game we've adapted over the years being moved into the virtual arena - had working in Flash a few years back but dropped due to mobile market)