explore ways to execute a background task as regularly as possible

[lsandini]

Hello,

The Fitbit app or Google Fit upload activity data to their servers' APIs quite regularly, even when the app is in the background (not terminated though).

I wrote a little Expo app after the Step Counter tutorial, which gathers steps count data in the background from Apple Health and from Android Health Connect. It then uploads the step count to my own API. I can trigger the query+upload either :

• manually
• using background fetch
• on receiving a silent push notification from my backend

But the OS (iOS, Android) throttles the execution of the task, depending on the battery optimizations, battery charge, on how much the app is used in the foreground, etc... I hardly manage to have an execution every 20-60 min during daytime, and I observe long pauses (up to 8-10 hours) during inactive or night time.

How does the Fitbit app manage to execute the regular data uploads even when backgrounded for a long time ???

Thanks
Lorenzo