Help in navigating the Network middleware for Ethernet interface.

Hi,
I am trying to send data-packets between 2 devices( edge embedded devices) through the ethernet interface(RTX RTOS with static IP4 config and UDP transmission on MCBSTM32400UME(stm32f407ighx) with MII PHY transceiver KSZ8081RNA. I am completely  new to the network middleware, I am facing configuration and compatibility issues with the files and packers installed via the RTE.
within ETH_MAC_STM32.C file -> error is raised as CMSIS_device _header,ET_MAC_STM32.h header files are not to be found.
similarly in ET_MAC_STM32.h -> error is raised as MX_Device.h is not found. Honestly I have been moving in circles and am clueless on how to move from here.

Also are there any example codes with similar usecase and setup which I could refer.


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