readAttributeAverageRmsVoltageMeasurementPeriodPhaseC(completion:)

Declaration

func readAttributeAverageRmsVoltageMeasurementPeriodPhaseC(completion: @escaping  @Sendable (NSNumber?, (any Error)?) -> Void)

func readAttributeAverageRmsVoltageMeasurementPeriodPhaseC() async throws -> NSNumber