System Workbench for STM32

Hello,

I was hoping to find information on this site regarding CubeMX function packs. I have created simple extensions using the FileMarker FTL files. However I need to create something similar to a LwIP function pack. I have posted this question on the ST Community site but have not received any responses.

Has anyone done this? Is there an SDK that I am missing? How do other vendors created these extensions?

Any help would be appreciated.

Thanks