RE: [lwip-users] Asynchronous events.

[Nick Thomas]

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden Behalf
> Of address@hidden
> Sent: 12 September 2008 17:40
> To: Mailing list for lwIP users
> Subject: Re: [lwip-users] Asynchronous events.
>
>
> You didn't say on which platform your lwIP code runs, but if it is the
> win32, why not try one of the socket examples like the ping example app?
>

Hi, thanks for the reply. I am using an ST chip, running OS20 operating
system.
I have made some progress today. I used wireshark, and enabled all of the
LWIP_DEBUGF stuff to give more info.
The main problem I had was that the I needed to add the 'Host:' to my HTTP
1.1 GET request. The Apache server was getting my request and not responding
with what I expected.

So, now I can send a GET request through LWIP, using the netconn_X and
netbuf_X commands.
The problem I have now is that I can't do it twice!

On the second attempt I now get:

Assertion "tcp_input: pcb->next != pcb (before cache)" failed at line 181 in
\blah\blah\core\tcp_in.c


My code now looks like:
NOTE: test_conn is a 'static struct netconn *test_conn;' which is
netconn_new() at startup.


#define OUR_SERVER "192.168.0.100"
const static char my_hdr[] = "GET / HTTP/1.1\r\nHost: " OUR_SERVER
"\r\n\r\n";

void nettest_two(void)
{
        err_t err;
        struct ip_addr ipaddr;
        u16_t len;
        struct netbuf      *buf;
        char *rq;
        int pos, line_count;

        ipaddr.addr = inet_addr(OUR_SERVER);

        /* ASSERT caused by the next line (I think) on second entry into this
function. */
        err = netconn_connect(test_conn, &ipaddr, 80);

        if (err == ERR_OK)
        {
                if (err == ERR_OK)
                {
                        printf("netconn_connect OK.\r\n");
                        err = netconn_write(test_conn, (void *)&my_hdr, 
sizeof(my_hdr),
NETCONN_NOCOPY);

                        if (err == ERR_OK)
                        {
                          printf("Written bytes OK.\r\n");

                          buf = netconn_recv(test_conn);
                          printf("Recv.\r\n");
                          if (buf != NULL)
                          {
                                  do
                                  {
                                          netbuf_data( buf, (void **)&rq, &len 
);
                                          printf("*** Received %d bytes 
***\r\n", len);
                                          line_count = 0;
                                          for (pos = 0; pos < len; ++pos)
                                          {
                                                  printf("%c", rq[pos]);
                                                  ++line_count;
                                                  if (line_count > 20)
                                                  {
                                                          printf("\r\n");
                                                          line_count = 0;
                                                  }
                                          }
                                  } while (netbuf_next(buf) >= 0);

                          }
                        }
                }
                netconn_close(test_conn);
        }
        else printf("netconn_connect failed.\r\n");
}


> Simon
>
>
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