For testing sometimes it is too hard to deal with security :-). To make the OPC UA server in WinCC OA unsecure add the following lines to the config file.
[opcuasrv] disableSecurity = 1 enableAnonymous = 1
Add the WCCOAopcuasrv manager to the project and start it.
To publish datapoints don’t forget to add the datapoints to the DP groups “OPCUARead” and “OPCUAWrite”.