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TMDS64GPEVM: File transfer with tcp protocol, I receive packets the size of mtu size. How can I combine these packets?

Part Number: TMDS64GPEVM

Hi Ethernet Experts

I am working on TMDSGPEVM board with mcu_plus_sdk_am64x_08_05_00_24 sdk version. And I am trying to transfer a file to my board(so my am64 board is receiving part). I am working on nortos tcp server application. In order to do that I used lwip callback functions.

The size of the file I am trying to transfer is larger than mtu size. So, on receiving side,  I see the size of each packet that comes to me in 1460 byte chunks. I need to collect the whole file in a buffer so i can use this file. 

Does the lwip callback function do this for me? If not, do I have to do it myself? this way it will take too long.

Thanks...