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