startObservingForThumbnails

@CheckReturnValue

abstract fun startObservingForThumbnails(shouldThumbnailBeFetched: (fileName: String) -> Single<Boolean>, maxNumberOfThumbnailsToFetch: Int, mediaType: MediaType): Completable

Starts to observe for thumbnails from the remote device, which will be emitted at thumbnailReceivedObservable.

A Completable that completes once the setup has been completed / observation has started

shouldThumbnailBeFetched

a lambda that should return based on the given fileName whether that thumbnail should be fetched

maxNumberOfThumbnailsToFetch

The maximum number of newest items to fetch

mediaType

The MediaType to handle