Hi,
mentioned project are simple ones, take a look rather at:
c:\NXP\S32DS.3.4\S32DS\software\S32SDK_S32K1XX_RTM_4.0.2\examples\S32K148\demo_apps\lwip\
See the documentation here, section "14.3.4 lwIP TCP/IP stack":
c:\NXP\S32DS.3.4\S32DS\software\S32SDK_S32K1XX_RTM_4.0.2\doc\S32SDK_S32K148_UserManual.pdf
Regards,
Lukas