void notifyAndCancelQueue(final @NonNull BluetoothDevice device) {
		for (final Request request : requests) {
			request.notifyFail(device, FailCallback.REASON_CANCELLED);
		}
		cancelQueue();
	}
Clears the queue, but first notifies all remaining tasks about cancellation.
@param device the connected device.
ble/src/main/java/no/nordicsemi/android/ble/RequestQueue.java