Re: [lwip-users] tcp_connect doesn't start the callback function

[Marianovich, Andre]

Thanks for your realy fast reply. Unfortunately I'm totaly new to lwIP 
but I try to do my best. Well, should I use some kind of network 
analyzing tool like wireshark to scan if there is packet transfer at all?

I use the lwip130 and this is out of the xilinx documentation:

"lwip130_v1_00_a in EDK provides adapters for the xps_ethernetlite and 
xps_ll_temac Xilinx® Ethernet MAC cores, and is based on the lwIP stack 
version 1.3.0."

The Xilinx tools also provide a version 3.00.a of the lwip stack.

When I debug the code everything seems to work fine excepting the 
callback function of tcp_connect. The whole network hardware work too 
because a linux that could run too can ping the host and connect to it.


Kieran Mansley schrieb:
> On Fri, 2010-03-19 at 10:19 +0100, Marianovich, Andre wrote:
> > Hi
> >
> > At some point there was a mail in which someone had a problem with the 
> > tcp_connect function but there was no answer. This did not seem to call 
> > the callback function. I now have the same problem. I would like to 
> > write a client (lwIP RAW API) to connect to a host running iperf. But 
> > apparently the tcp_connect function does nothing, does not call the 
> > callback function I suppose and it will not connect. All should run on 
> > the PPC 405 of a Xilinx Virtex 4 board. Below I've added the whole code 
> > which is quite similar to the code of the previously mentioned message.
>
> To solve this we need to establish a cause for why the connected
> callback is not happening.
>
> Could you for example see if the tcp_connect() results in SYN packets
> being sent on the wire, and the other end responding (easiest to do this
> with a packet capture)?
>
> If that works it would be worth turning on some of the debugging in lwIP
> to establish what happens when the other end responds. 
>
> If you don't seen any packets on the wire, then there is likely some
> problem between lwIP and the driver you're using.  Are you able to test
> this and establish that it is all working correctly?  E.g. sending and
> receiving UDP packets.
>
> Do you know which version of lwIP you are using, and which port to your
> hardware?
>
> Kieran
>
>
>
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