Can't you "just" implement frequent AGPS data uploading (like once a day) to Gadgetbridge as an option?
@Hank started
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.
Can't you "just" implement frequent AGPS data uploading (like once a day) to Gadgetbridge as an option?