ETH_LWIP problem to send UDP in RTOS mode

Hi everyone,

With this project, I am able to ping the xmc4500 board.

but by using python or any other socket test app I am not able to receive the message. "Hello Word"
I am using a switch with normal Ethernet cables.
Am I doing something wrong?
did any one successfully run this code? I want to establish a send/receive UDP communication between xmc4500 and a PC.
any help is highly appreciated.

Thanks.