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