[lwip-users] How to send a large dynamic generated http page?

[ptau]

I want to send one http page that is 200K bytes. I only have 4K byte buffer
to work with to generate the page.  So I have to generate it dynamically
multiple times. 

How can I send a large page in 4k interval? 
I tried to insert the send_data(pcb, hs); after the first one and inside the
http_sent, did not work well. There is some internals in tcp_write that I
don't quite understand. 

thank
Ptau

       hs->file = file.data;
        hs->left = file.len;

        send_data(pcb, hs);
        tcp_sent(pcb, http_sent);


static void
send_data(struct tcp_pcb *pcb, struct http_state *hs)
{
  err_t err;
  u16_t len;

  /* We cannot send more data than space avaliable in the send
     buffer. */
  if (tcp_sndbuf(pcb) < hs->left)
  {
    len = tcp_sndbuf(pcb);
  }
  else
  {
    len = hs->left;
  }

  err = tcp_write(pcb, hs->file, len, 0);

  if (err == ERR_OK)
  {
    hs->file += len;
    hs->left -= len;
  }
}



/*-----------------------------------------------------------------------------------*/
static err_t
http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
{
  struct http_state *hs;

  hs = arg;

  if (hs->left > 0)
  {
    send_data(pcb, hs);
  }

  else
        close_conn(pcb, hs);
  return ERR_OK;


}
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