It’s Time for migrating to FCM from GCM.

FirebaseCloud Messaging (FCM) is the new version of GCM. It inherits the reliable and scalable GCM infrastructure, plus new features. It is a cross-platform solution that let user reliably deliver and receive messages and notifications at no cost. It supports Android, iOS, Desktop Web Browsers, the Mobile web with JavaScript or WebPush and Internet-of-Things (IoT) devices.

Firebase Cloud Messaging
Firebase CloudMessaging is a component of the Firebase suite of tools for cross-platform application development.
1.Send unlimited upstream/downstream messages
2.Send messages to individual devices or a user segment
3.Handle all aspects of queueing and delivery
4.Optimize for battery efficiency...(More)

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