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Hi! I have the same problem.
If I upload the ArduinoOPCSample to MEGA 2560, it Works well and I can see into my MatrikonOPC Explorer (And the other examples…). But if I upload to Leonardo it Works at 50%
I can monitorize into “Serial Monitor” (pressing enter, and asking one of therse items –> “Easy testing of your OPC Sketch”), but in Matrikon I can connect to server but I cannot see the ítems.
I run LED example on an Uno board ant it works: both in the serial monitor and in Kassl dOPC.
Then I run the same script on Leonardo. It works in the serial monitor, but doesn’t in dOPC: dOPC can see my server, but it doesn’t see items.