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LWIP on ARM Cortex M3

Hi all,
I'm doing a project that apply the Lwip library on ARM Cortex M3. Every application works well, but the Server/Client application does not. Although the server and client can recognize the IP of each other, I cannot send a string from client to server by the command:

char *string = "Hello";
tcp_write(pcb,string, sizeof(string), 1); /* send the data right now */ tcp_output(pcb);

I use Wireshark to capture the TCP packet, but I can only see the broadcast request packet.

Can you help me solve this ?

Thank you.