If the device comes back online FCM will notify the app that pending messages were deleted: When the device gets back online, FCM will call onDeletedMessages() on Android . When the app is opened, FCM will trigger FIRMessagingMessagesDeletedNotification on iOS to notify the app that pending messages were deleted.
Read moreWhat is FCM push notification?
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 4000 bytes to a client app.
Read moreHow do I use FCM for push notifications?
If you are using GCM with Intercom you will need to migrate to FCM.
Read moreIs FCM push notification free?
Send messages to any device Firebase Cloud Messaging (FCM) provides a reliable and battery-efficient connection between your server and devices that allows you to deliver and receive messages and notifications on iOS, Android, and the web at no cost .
Read moreHow does push notification work Firebase?
The Android push notifications through FCM actually treats the Data Messages as notification messages itself . As the interactions in the data messages are handled by the app itself, FCM’s work is just to deliver a notification and the message content.
Read moreHow do you handle push notifications?
Option 1: In your Settings app
Read more