How to establish a connection which will be used to sending data by server to application?

I am preparing an application for Android which will display current status of some services.

Application should get this information fro开发者_开发知识库m my server. However there is no rule in periods between changes of statuses.

I want to avoid unnecessary requests to server.

How to establish a kind of connection, which will allow server to decide when send delta to application?

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Push notification technique will be good for your case

Refrences;

• Android C2DM
• http://tokudu.com/2010/how-to-implement-push-notifications-for-android/
• http://blog.boxedice.com/2010/10/07/android-push-notifications-tutorial/
• http://www.vogella.de/articles/AndroidCloudToDeviceMessaging/article.html

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Use the c2dm framework. They even have a sample application for Android and AppEngine: Jumpnote