I forgot to mention this as well, but this link: https://community.st.com/t5/stm32-mcus-embedded-software/lwip-is-not-working-in-cmsis-v2/td-p/67495/page/2 might also help you get Ethernet working with the V2 of CMSIS.

First, I recommend that you take a look at this micro-ROS link: https://github.com/micro-ROS/micro_ros_stm32cubemx_utilsNext, you need to change some configurations for both LWIP, Ethernet, and FreeRTOS. Since you have the STM32F767ZI, you need to ch...