GCM
What's GCM APK?
GCM is a app for Android, It's developed by iApplize author.
First released on google play in 10 years ago and latest version released in 7 years ago.
This app has 0 download times on Google play and rated as 4.31 stars with 98 rated times.
This product is an app in Tools category
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new version is out:
https://play.google.com/store/apps/details?id=com.iapplize.gcmtest
and new code:
https://github.com/lolevsky/GCM_Chat_example
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Google Cloud Messaging for Android application.
you can test it by sending yourself or other users message by using GCM and other devices that use this application in the last 24 hours.
Requires access to user email to send other devices.
you can find the base source code of the application and server side (servlet for app engine) in the link:
http://code.google.com/p/gcm-android-and-app-engine/