ST tcp echo client for sending larger data blocks

[sabari1]

TCP echo client application running on my STM board and server is run on Linux PC , so here how can I enable the IP fragmentation and reassembly feature in order to transmit/recieve larger chunk of data from my application program to tcp_send/receive functions.

in the example code given from ST i didn't see the fragmentation and reassembly part.(tcp_echo_client for stm32 U585)

or do i need to do manual reassembly in the case of large amount of data(larger than the specified MTU size).