flutter app with free-fall detection

as a millstone number 1, I need a POC of a flutter simple view + modalview with free fall detection.

– Android and iOS.
– Background mode for both platforms.
– Get user current location.
– Should works for mostly all Android/iOS devices(accelerometer).
– In case of free fall, display a text message or whatever.
– Powerless (considering battery consumption).
– Keeping the app in the background, for both platforms.
This is a POC (milestone 1)