Can connect client, but no items visible

[djimmo]

I installed the OPC Server and I am trying to view the items in Matrikon OPC Explorer. I can see the server and can successfully connect to it, however no items are visible. The logging from the OPC Server shows the following:

18-Mar-19 13:35:44 > Running OPC Server from C:\Users\Djim\Downloads\ArduinoOPCServer.exe 18-Mar-19 13:35:44 > Waiting for OPC clients to connect.... 18-Mar-19 13:36:21 > Connected client 18-Mar-19 13:36:21 > Trying to open COM5 port 18-Mar-19 13:36:21 > COM5 port open 18-Mar-19 13:36:21 > Asking for available OPCItems from ArduinoSerial0 18-Mar-19 13:36:21 > Frame:

On the last line it should send an overview with available fields, as I concluded from some of the video tutorials. Unfortunately it's blank... Any help would be greatly appreciated

regards, Djim