Hi,
Sorry for the delayed response.
You can refer to the examples present in VisualDSP installation (..\Blackfin\Examples\ADSP-BF518F EZ-Board\LAN). Please also refer to the LWIP documentation in VisualDSP library (..\Blackfin\lib\src\lwip\contrib\ports\ADSP-Blackfin\docs).
Let me know if you need more details.
Regards,
Punarva