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Google Cloud Messaging - GCM

If you have little to no knowledge on Google Cloud Messaging (or shortly GCM), then this article is just for you. Here I've tried to give an elaborate description of what GCM is, it's overview, components, how it works, it's pros and cons, and finally a brief tutorial on how to implement it in your project. Note that this article is intended for the client-side developers, not the server-side. To be more precise, it's been written from...