Powerful New Messaging Features with GCM
At Google I/O the GCM team announced the general availability of several GCM capabilities, including the Cloud Connection Server, User Notifications, and a new API called Delivery Receipt

Check out the resources below to learn what these capabilities can do and how to to get started with them.

Blog post: http://goo.gl/4OPd0t
IO Bytes video: http://goo.gl/9joKQc
GCM session at I/O 2014: http://goo.gl/5SjX6f
Developer documentation: http://goo.gl/JbHBb9
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