Firebase Docs Reference FirebaseMessaging Framework Reference MessagingMessageStatus enum MessagingMessageStatus : Int Status for the downstream message received by the app. unknown Unknown status. Declaration Swift case unknown = 0 new New downstream message received by the app. Declaration Swift case new = 1 Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated June 20, 2018.