What's the best way to trigger an function to run via a request sent by the server?

[Android Central Question]

Here is the use case:

- the user launches the app and grants permission, the app connects to the server
- at some point in the future, the server sends a request to the app
- the app, regardless of whether it is running or not in the foreground or background, wakes up to run this code

Here are some options I have explored which I am unsure about:

- server sent events
- websockets
- push notifications

Is there a reliable and safe way to do this on android, whether it's Kotlin or Flutter? Can you provide examples or documentation?

 

[B. Diddy]

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[Rukbat]

The "whether it is running or not" part is going to be a problem. If the app isn't running, it's not going to receive the request. It has to be running to receive requests.