Re: [lwip-users] lwip debugging basics

[Jonathan Larmour]

liamstask wrote:
> Hi - I'm hoping to get some general info about how to set up lwIP for
> debugging.  I've had a difficult time finding much in the way of info about
> how this works at all, so any pointers would be much appreciated!
>
> Is debugging generally done over ICMP?  Is there a way to pipe it through
> another transport, ideally one that is not network-based?  Is there (however
> terse) a description of how this works anywhere?

If you need to debug the stack, you need to avoid using the stack!

You need some other communications channel. I imagine on embedded boards, 
people use serial mostly. Then in the port you ensure that you define the 
macros LWIP_PLATFORM_DIAG and LWIP_PLATFORM_ASSERT appropriately in the 
arch/cc.h header file, and then you can also consider enabling various of 
the LWIP_DEBUG options in your lwipopts.h file. There's also statistics 
with LWIP_STATS, which are useful to debug memory issues.

Alternatively if you want to be able to use a proper debugger such as GDB, 
you should probably consider running lwIP on top of an OS that supports 
that, such as eCos (which already has an lwIP port... go to 
http://ecos.sourceware.org/ then download eCos 2.0, then upgrade to its 
current anonymous CVS repository source base).

Jifl
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