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 Firebase Cloud Messaging

Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost.

Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4KB to a client app.

How does it work?

An FCM implementation includes two main components for sending and receiving:

1. A trusted environment such as Cloud Functions for Firebase or an app server on which to build, target, and send messages.
2. An iOS, Android, or web (JavaScript) client app that receives messages via the corresponding platform-specific transport service.

You can send messages via the Firebase Admin SDK or the FCM server protocols. For testing or for sending marketing or engagement messages with powerful built-in targeting and analytics, you can also use the Notifications composer.

Send notification messages that are displayed to your user. Or send data messages and determine completely what happens in your application code. See Message types.

Distribute messages to your client app in any of 3 ways—to single devices, to groups of devices, or to devices subscribed to topics.

Send acknowledgments, chats, and other messages from devices back to your server over FCM’s reliable and battery-efficient connection channel.

Decide whether you want to use the Firebase Admin SDK or one of the server protocols to create your sending logic—logic to authenticate, build send requests, handle responses, and so on. Then build out the logic in your trusted environment. Note that if you want to use upstream messaging from your client applications, you must use XMPP, and that Cloud Functions does not support the persistent connection required by XMPP.

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