RE: [lwip-users] parameter for netif_add in UDP

[Ben Bobbitt]

Thanks for the quick response.  I'm a little confused by the driver comment,
though.  What should I have to do in that regard?  

The symptom that I am seeing (using wireshark to view the packets ) is that
my system is sending out an ICMP reject (port unreachable) when the UDP
packets reach him. This would seem to indicate some problem with the setup
in regard to the UDP service.  

Here's what I am doing to set up the interface...
My addresses at this point are all 0 because of using DHCP

sys_init();
  mem_init();
  memp_init();
  pbuf_init();
  netif_init();
  ip_init();  
  udp_init();  
  tcpip_init( prvEthernetConfigureInterface, NULL );

where in prvEthernetConfigureInterface:

netif_add(&MACB_if, &xIpAddr, &xNetMask, &xGateway, NULL, ethernetif_init,
tcpip_input);
netif_set_default(&MACB_if);
dhcp_start(&MACB_if);

in my UDP task, I'm waiting while MACB_if.dhcp->state != DHCP_BOUND before
calling netconn_new().   

Of course, I've checked all of the UDP related config options that I can
find in the lwipopts.h   

Ben

 

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Jonathan Larmour
Sent: Wednesday, February 13, 2008 6:16 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] parameter for netif_add in UDP

Ben Bobbitt wrote:
> 
> 
> Just curious if I’ve missed something in the documentation,  but my 
> application only needs to use UDP, so what parameter do I pass to the 
> netif_add() function for the input() callback when setting up the 
> interface?
[snip]
> Any advice would be appreciated.    I am using the atmel avr32 and the 
> IAR compiler.   This is under FreeRTOS with the 1.2.0 version of lwIP.   

For lwIP 1.2.0, you should use tcpip_input. That way it gets sent to 
lwip's tcpip handling thread, which means that the packet is passed in to 
the stack in the correct context.

Note that for ethernet interfaces, your driver will also have had to 
interface with the etharp code to pass packets in.

Jifl
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