Google App Engine XMPP를 활용하여 Android Push Service 만들기

http://softwaregeeks.org/2011/07/11/google-app-engine-xmpp%EB%A5%BC-%ED%99%9C%EC%9A%A9%ED%95%98%EC%97%AC-android-push-service-%EB%A7%8C%EB%93%A4%EA%B8%B01/

http://softwaregeeks.org/2011/11/13/google-app-engine-xmpp%EB%A5%BC-%ED%99%9C%EC%9A%A9%ED%95%98%EC%97%AC-android-push-service-%EB%A7%8C%EB%93%A4%EA%B8%B02/