Android Question Using Firebase for updates - I don't want the App to wake up

Push notifications start the app process if it is not running. This is how they work. Whether you show any UI or not is up to you.

However there are much simpler ways to communicate between two installed apps. You can send an intent between the apps. This will also cause the other app to start if it is not running.

If you want to send a message to the second app when it is running, then you should use UdpSocket.

Thanks Erel, it has been a while but I have gone back to look at your reply to try and create a better versiom of comms for a new App, but having read my initial post I am not sure I explain this very well.

I was to share data between a single App running on more than one device (not two Apps running on a single device, which is how my original post read)

I have this working now with firebase so that when data is updated on one device it sends a firebase message which wakes up all the other devices running the same App (logged in) and refreshs the data by starting comms on these other devices.

Is there a better way to achieve this?

You should never post in old threads.

Check CloudKVS.