Firebase Cloud Messaging
Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably deliver messages at no cost.
Using deprecated Google Cloud Messaging APIs? Learn more about how to migrate to FCM.
|Send notification messages or data messages||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.|
|Versatile message targeting||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 messages from client apps||Send acknowledgments, chats, and other messages from devices back to your server over FCM’s reliable and battery-efficient connection channel.|
How does it work?
An FCM implementation includes two main components for sending and receiving:
- A trusted environment such as Cloud Functions for Firebase or an app server on which to build, target, and send messages.
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.
|Set up the FCM SDK||Set up Firebase and FCM on your app according to the setup instructions for your platform.|
|Develop your client app||Add message handling, topic subscription logic, or other optional features to your client app. During the development, you can easily send test messages from the Notifications composer.|
|Develop your app server||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.|
Set up your trusted environment where you'll build and send message requests. You can write sending logic using the Admin SDK, and readily deploy that code on Cloud Functions for Firebase or other cloud environments managed by Google. Alternatively, you can perform server development using the FCM server protocols.
Learn more about sending data payloads, setting message priority, and other messaging options that are available with FCM.