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