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