Seems like there is a permission setting you might have missed? On normal android, background running options are under battery category. Unfortunately I do not know graphene well enough.
I have Gadgetbridge set to unrestricted battery access which allows it to run background process at startup. At least that's what I've seem from the forums. Also, I always have a notif basically saying no devices connected even when I close the app.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Seems like there is a permission setting you might have missed? On normal android, background running options are under battery category. Unfortunately I do not know graphene well enough.