[lwip-users] Tcp Server on Texas Instrument RM57

[Julio Cesar Aguilar Zerpa]

Hi there,

I am trying to use the LwIP library (1.4.1) to create a simple tcp 
server on a Texas Instrument RM57.

So far, I could make the "tcpecho_raw" example to work using an static ip.

I also added the following function (which did not work), to be able to 
send data that wasn't an echo:

void tcpServer_send()
{
    uint8 data[] = "TEST_DATA";
    struct pbuf* buffer = pbuf_alloc(PBUF_RAW, sizeof(data), PBUF_POOL);

    if (buffer)
    {
        sciDisplayText(sciREG1, txt_new_line, sizeof(txt_new_line));
        sciDisplayText(sciREG1, "buffer created", sizeof("buffer 
created"));

        buffer->tot_len = sizeof(data);
        buffer->len = sizeof(data);
        buffer->payload = data;
        tcpecho_es->p = buffer;

        tcpecho_raw_send(tcpecho_raw_pcb, tcpecho_es);
    }
}

As you can see, the function prints a debug msg ("buffer created"). I 
modified the function 'tcpecho_raw_send' to also print a debug msg (the 
data being sent).

When I run the program, I can see the msg "buffer created" every time 
the function is called, but the msg from 'tcpecho_raw_send' comes only 
when I close the client! (And the msg is missing the acutal data, btw).

NOTE: I want to build a server that receives some commands and sends a 
block of data (4KB) every 60 ms. I am using the raw API because I don't 
want to use blocking functions (from what I understood the netconn API 
uses blocking functions).

I would appreciate any help.

Best regards,

Julio Aguilar