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CentralManager: didDiscover never called in the background

I am doing centralManager.scanForPeripheralsWithServices([myServiceUUID], options: nil) in the background, but the corresponding

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber)

never called.

When the application is in the foreground, everything works as expected. But when the application is in the background, this method is never called.

I have a bluetooth-central background.

What else can I lose?

EDIT: I uploaded the code to Github: https://github.com/haemi/BeaconBLEPoc

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ios10 bluetooth bluetooth-lowenergy
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