Has anyone used UTP inside Modelica:DeviceDrivers to exchange data between two PCs?

What I could do successfully:
- run the UDP exampes included in thModelica_DeviceDriivers.
- use two instances of OpenModelica, one that sends UDP data the other that receives it, both on the same PC.

What I could not do:
When I connect two PCS through an ethernet switch and try to send from an OM instance on the first PC to an OM instance in the second one (both through the same unique port) the receiving PC does not receive anything.

If anyone succeeded in transferring data across PCs using UDP his help (and a working example) is very much welcome,

Thank you in advance.