public Task UpdateDevicesAsync(IEnumerable <DeviceHeaderEntity> deviceHeaders)
 => DeviceHeaderCollectionSynchronisation.SynchronizeAsync(Task.FromResult(deviceHeaders).AsITask());
 public DevicesViewModel()
 {
     DeviceHeaderCollectionSynchronisation = new DeviceHeaderCollectionSynchronisation();
     DeviceCollectionSynchronisation       = new DeviceCollectionSynchronisation(DeviceHeaderCollectionSynchronisation);
 }