How do I use the serial number of a Landis+Gyr E570 meter to connect to the meter?

settings = GXSettings()
settings.media = GXNet()
settings.media.hostName = args.hostname
settings.media.port = args.port

settings.trace = TraceLevel.VERBOSE if args.trace.upper() == "VERBOSE" else TraceLevel.OFF

settings.client = GXDLMSClient()
settings.client.interfaceType = InterfaceType.HDLC
settings.client.serverAddress = GXDLMSClient.getServerAddress(args.serial_number)
settings.client.clientAddress = args.client_address
settings.client.authentication = {0: Authentication.NONE, 1: Authentication.LOW, 2: Authentication.HIGH}.get(args.security)
if settings.client.authentication is None:
raise ValueError("Nieprawidłowy poziom bezpieczeństwa.")
settings.client.password = args.password
settings.client.useLogicalNameReferencing = False
settings.client.timeout = 300000

What am I doing wrong?

Ok I replaced the function to get GetServerAddress replaced with GetServerAddressFromSerialNumber and now I have an error:
Error during connection initialization: 'GXDLMSClient' object has no attribute 'ciphering'
Main error: 'GXDLMSClient' object has no attribute 'ciphering'

Ok, I'm using GXDLMS Secure Client, problem solved