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