How to run background process in watchOS? - swift

Question

I have made my first app for apple watch and faced with impossible to send data every 10 seconds to my backend .
Application is frozen when display turns off and running again from scratch when display is on.
I tryed to run workout session like in this example.
But it doesn't help, app is frozen after 10 seconds of inactivity.
I try to send accelerometer data to my backend every 10 seconds in InterfaceController.swift:
//...
override func willActivate() {
super.willActivate()
startWorkout() //it's copied from example
startAnglesTracker()
}
func startAnglesTracker() {
if motion.isAccelerometerAvailable && !motion.isAccelerometerActive {
motion.accelerometerUpdateInterval = 10
motion.startAccelerometerUpdates(to: OperationQueue.main) {
//sending here
}
}
}
private func startWorkout() {
let workoutConfiguration = HKWorkoutConfiguration()
workoutConfiguration.activityType = .crossTraining
workoutConfiguration.locationType = .indoor
do {
workoutSession = try HKWorkoutSession(configuration: workoutConfiguration)
workoutSession?.delegate = self
healthStore.start(workoutSession!)
vibrate()
} catch {
serverData.setText("workoutSession error")
}
}
//...
extension InterfaceController: HKWorkoutSessionDelegate {
func workoutSession(_ workoutSession: HKWorkoutSession, didFailWithError error: Error) {
}
func workoutSession(_ workoutSession: HKWorkoutSession, didGenerate event: HKWorkoutEvent) {
}
func workoutSession(_ workoutSession: HKWorkoutSession, didChangeTo toState: HKWorkoutSessionState, from fromState: HKWorkoutSessionState, date: Date) {
}
}
It works only when display is active.