Android Question Firebase In-App Messaging

Already possible. Just set client to subscribe some topic and send messages to that topic.
Now every device that is subscribed will get the message. Although very little prevents someone else also posting to that topic.
 
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Same thing. If an user starts your app you'll know it. Get the "messages" from your server's db directly. Or use FCM. In your app you can decide not to show a notification but store it until the user uses you app again. How? Send data messages only.
 
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