Running processing task for data upload together with state restoration

Question

ShimonE OP

Created 5d

Replies 1

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Hi All,

In continuation of this thread https://developer.apple.com/forums/thread/804439

I want to perform data upload after getting it from the BLE device. As state restoration wake should not deal with data upload i though of using a processing task to perform the data upload. So the flow will be something like: Connect to device -> listen to notification -> go to background -> wake from notification -> handle data download from ble device -> register processing task for data upload -> hopefully get the data uploaded

From reading about processing task i understand that the task execution is completely handled by the OS and depends on user behaviour and app usage. I even saw that if the user is not using the app for a while, the OS might not even perfoirm the task. So my quesiton is: does state restoration wakeup and perfroming data dowloads in the backgound considered app usage that will increase the likeluhood the task will get execution time? Can we rely on this for a scenario that the user opens the app for the first time, register, onboard for ble, connect to devie and then put it in the background for days or weeks and only relying on state restoration and processing tasks to do their thing?

Sorry for the long read and appreciate your support!

Shimon

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Answer 1

Engineer OP

Apple

5d

Unfortunately state restoration won't count as the app is being used, for background activity purposes.

As most background tasks are considered discretionary, and when/whether they run is based on complex decision based on usage and device state, it is not possible for us to give any indication on how a specific request will behave.

What I can suggest is to keep track of the restorations and the background tasks, and if there comes a time that they are grossly out of sync, you could always engage the user by a local notification to ask them to launch the app, in which case you could even sync all the missing data in the foreground when they do.

Just a quick solution I could think of, but you might be able to devise a better strategy based on your specific use case.

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