Re: [lwip-users] lwip on freertos

[Jesper Vestergaard]

I have been digging a little deeper and with wireshark i can see that my 
browser sends a SYN but never receives a SYN ACK.

The function flow looks like this:

tcpip_thread()  -> ip_input() -> tcp_input -> tcp_listen_input -> 
tcp_output (tcp_output returns ERR_OK)

The low_level_output in ethernetif is never called so the SYN ACK is 
never sent. A little later my laptop requests an ARP from the board and 
the board successfully returns an ARP.

Can anyone help me figuring out why the SYN ACK is never send?


Jesper Vestergaard wrote:
> Hi,
>
> I'm trying to implement a simple webserver with lwip version 1.3.0 on 
> a avr32 ap7000 board running freertos. The EMAC driver is working 
> properly.
>
> When I load up my browser and type in the ip adress of the board, the 
> tcpip_thread() properly receives the packet and calls the ip_input() 
> function.
>
> Unfortunately the mailbox fetch in netconn_accept() never returns and  
> the webserver request is never gonna be processed.
>
> I'm having a hard time figuring out the link between the ip_input() 
> function and the missing delivery of the mailbox in netconn_accept(). 
> Can anyone help me with this problem?
>
>
> Here's how i use lwip:
>
> tcpip_init( NULL, NULL );
> pxHTTPListener = netconn_new( NETCONN_TCP );
> netconn_bind(pxHTTPListener, IP_ADDR_ANY, 80 );
> netconn_listen( pxHTTPListener );
>
> for( ;; )
> {
>    pxNewConnection = netconn_accept(pxHTTPListener);
>    vProcessConnection( pxNewConnection );
> }
>
>
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