Firebase Cloud Messaging is a cross-platform messaging solution that lets you reliably deliver messages and notifications to Android, iOS or the Web at no cost. For example, you can specify that new data is available for sync, special offers are ready to re-engage users and more. Messages can be sent to individual devices, groups of devices, or even topics that devices are subscribed to.
Messages can carry a payload of up to 4k, and can also be sent upstream from devices to a central server or other devices.
Firebase Cloud Messaging is the successor to Google Cloud Messaging, and you can learn details here about your options if you already use Google Cloud Messaging.
We’ve provided some great samples if you want to get started in building apps that use Firebase Cloud Messaging, or you can follow the walkthroughs on Android, iOS or the Web.
What's the difference between using FCM and Notifications?
With FN, you don't write any code, just link in the library I showed, and then, from the Firebase Console, you can send messages to devices, groups of devices, topics etc.With FCM you can take this a step further by having your own server for dispatching messages, giving you the ability to, for example, go upstream.
hi can i ask how you set up a server to trigger a firebase message as I can get the console to send my tablet the message i need but i cant get it to trigger any other way. I was also testing on postman,...crafting the json message with the verification token and api key,...i get a successfull hit of the firebase server but no message comes through,...please help!
Is it possible to trigger cloud messages based on data changes in my firebase database? Is there a function like cloud code to alernate data on server?
When data changes in your Firebase Database you can already subscribe to an onDataChange event to catch and handle it.If you wanted to do something further, you could have an app use FCM to then send a notification.
Subscribing to onDataChange doesn't generate any notification when the app is closed. Is there a way to trigger such a notification from another app using FCM API? For example, a client creates a new post in a topic, and in the same time uses the API to trigger a notification to all subscribers? Or is setting up a my own server the only way? Thanks.
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It would be very useful if device-to-device messaging can be done without an additional server...
Take a look at this:https://codelabs.developers.google.com/codelabs/firebase-android/index.html?index=..%2F..%2Findex#0
How this help us in case we want device-to-device messaging?
I want to use FCM to create a comunication from a device to another device in android, is possible?
Yep. Take a look at this:https://codelabs.developers.google.com/codelabs/firebase-web/index.html?index=..%2F..%2Fio2016#0
There is no example of upstream messaging in the sample code, could you please provide sample for the FCM upstream messaging.
I have the same issues.
What's the advantage using FCM prior WebSockets?Doesn't FCM even implement WebSockets?