![]() Background RestrictionsĪndroid has limitations on what apps can do while running in the background. ![]() So even if you’re setting the priority of your message to high, it might be delayed by the device if you don’t have enough quota to wake the application up. Starting from Android P, all applications adhere to app standby buckets. High priority messages will be sent out right away, but still are restricted by the Android app standby bucket policy on the device (for Android P and onwards). If the device is in doze mode, FCM will hold on to normal priority messages until the device is out of doze mode. Both Android and iOS platforms will perform battery optimizations and deliver these messages accordingly. You can set the priority of a message to be high or normal through the FCM API. Messages for applications on these devices will continue to be accepted by FCM, but will not be delivered unless the device comes back online. There are many devices that go offline, and some never come back online. The device is offline:įCM cannot deliver the message if the device is not online. There are many factors that affect the actual delivery of the message to the device and the amount of information FCM can provide about the delivery. Note: If the time to live of the pending messages has expired, the above functions will not be triggered. When the app is opened, FCM will trigger FIRMessagingMessagesDeletedNotification on iOS to notify the app that pending messages were deleted.When the device gets back online, FCM will call onDeletedMessages() on Android.If the device comes back online FCM will notify the app that pending messages were deleted: ![]() If FCM has information about the device connection and knows that the device hasn’t been online for more than a month, FCM will accept the message but will not actually try to deliver it. The device has not been online for more than a month Only the most recent message is relevant. An example use case would be a sports app that updates users with the latest score. You can set collapse keys to replace the message with newer versions. The requested message is superseded by another message ![]() The maximum time that FCM will retry is 28 days, which is the default value. You can set message expiry through the API. When FCM returns a successful response to your API request, it simply means that FCM will start trying to deliver this message to the device or to the service responsible for delivering the message to the device (for example: Apple Push Notification service for delivery to iOS devices or Mozilla Push Service for delivery to Firefox browsers). In this post, we will look into the Firebase Cloud Messaging infrastructure and how messages are actually delivered to devices. What happens after FCM accepts your message request? FCM APIs tell you if there was a failure during the acceptance of the request by returning an error code and an explanation for the failure, but this only covers the part of the request between you and the FCM backend. You can target an application on a device, or target millions of them through the topics API. If you are a user of Firebase Cloud Messaging (FCM), you know that there are many different ways to send messages.
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