Connection between Android and AppEngine! Suggestions

I'm about to start a new project where an android client and a gwt client has to communicate with an appengine server.

My first thougts were GWT to Appengine = RPC Android to Appengine = RPC Appengine to Android = C2DM

My question is if you have better ideas to solve a communication. Basically what I want to do is send some Strings from the GWT client to Appengine and from Appengine to Android and th开发者_JAVA百科e same way back. But everything for one account. So Bob is signed up on the GWT client and communicates with his Android phone.(should work on 3G too)

Some suggestions?

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Looks like you're looking for RequestFactory: http://googlewebtoolkit.blogspot.com/2011/05/android-meet-app-engine-app-engine-meet.html

It won't solve your "AppEngine to Android" communication though (though maybe you could make it like AppEngine is an RF client and the Android phone an RF server, using CD2M as the transport)