@jrozanc,
The Kepware Fanuc Suite contains both the Fanuc Focas Ethernet and Fanuc Focas HSSB drivers which can be used to communicate with Fanuc Focas CNCs to OPC client applications, including HMI, SCADA, Historian, MES, ERP, and countless custom applications. It supports communications with multiple protocol networks, including Fanuc Focas 1 Ethernet and Fanuc Focas HSSB. I am not familiar with the Fanuc drivers you mentioned that can be obtained from Fanuc directly. You may need to contact Fanuc directly to see how those drivers interact with the CNC devices. There are external requirements called "Focus Libraries" needed for the Kepware Focus driver to work. The Focas libraries must be purchased from Fanuc. In the US, call 800-FANUC-US. Then, choose CNC, Parts to place your order. Here is a link to page in Kepware manual that covers these external requirements:
https://www.ptc.com/store/-/media/kepware-store/en/manuals/fanuc-focas-ethernet-manual.pdf#page=6
Thanks,
*Chris