readAttributeOnLevel(completionHandler:)
Declaration
func readAttributeOnLevel(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeOnLevel() async throws -> NSNumberfunc readAttributeOnLevel(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeOnLevel() async throws -> NSNumber