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