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When do FCM tokens expire? Is it at 6 months?
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It doesn't expire though. It renews itself if one of the following happens. According to https://firebase.google.com/docs/cloud-messaging/android/client: -The app deletes Instance ID.
Similarly to how GCM works, the FCM token can change due to token-rotation. Note: the token rotation is a rare-event. Don't expect to see it often. But still, if you care about the token you should implement onTokenRefresh() to be informed of changes.
Usually, cookies are limited to 4096 bytes, which consist of name, value, expiry date etc.
An FCM Token, or much commonly known as a registrationToken like in google-cloud-messaging. As described in the GCM FCM docs: An ID issued by the GCM connection servers to the client app that allows it to receive messages. Note that registration tokens must be kept secret.
It doesn't expire though. It renews itself if one of the following happens.
According to https://firebase.google.com/docs/cloud-messaging/android/client:
Monitor token generation
The onTokenRefreshcallback fires whenever a new token is generated, so calling getToken in its context ensures that you are accessing a current, available registration token. Make sure you have added the service to your manifest, then call getToken in the context of onTokenRefresh, and log the value as shown:
@Override public void onTokenRefresh() { // Get updated InstanceID token. String refreshedToken = FirebaseInstanceId.getInstance().getToken(); Log.d(TAG, "Refreshed token: " + refreshedToken); // If you want to send messages to this application instance or // manage this apps subscriptions on the server side, send the // Instance ID token to your app server. sendRegistrationToServer(refreshedToken); } EDIT
onTokenRefresh() is now deprecated. onNewToken() should be used instead.
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