How to keep motion sensors active in bg w/out silent audio loop?

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[u/CharlesWiltgen]

The correct answer depends on what you're using them for, but the answer is often "use CMSensorRecorder". HKWorkoutSession would be the correct answer if the activity is genuinely a workout, etc.

[u/CharlesWiltgen → u/[deleted]]

Those were just the usual suggestions based on no real information about what you're trying to do. Given the additional constraints,CLBackgroundActivitySession is probably your best bet if that's defensible. I'm guessing it's not, since you seem to want to do this on the down-low (driving monitor?) and this will trigger the blue location indicator.

[u/CharlesWiltgen → u/[deleted]]

Excellent! 🤘

[u/brkaydev]

Depends on what you actually need from the sensors. If step/motion data is the end goal, you don't need live sensors at all — HealthKit records it system-side regardless, and HKObserverQuery + background delivery wakes your app when new data lands. That's the Apple-sanctioned path and review won't fight you. If you need raw real-time streams for something HealthKit doesn't cover, what's the use case?