How to wake an application from a backend server process?

Question

Lets say your server completes a process, a timer or something, and wants to call back to the application to update its state, regardless of whether or not the app is in the background/closed. What's the best way to handle this, FCM? And will that ensure the app always wakes?

Answer 1

Yes, it is good case for FCM. Just send message from server and do what you want in FCM listener in app.

There are two types of messages in FCM: display messages and data messages. Display messages trigger the onMessageReceived only when app in foreground, data messages is what you want - trigger callback even if app killed.

There is answer with details how exactly do what you want.