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Re: [lwip-users] TCP problems using pppos on stm32

From: Sylvain Rochet
Subject: Re: [lwip-users] TCP problems using pppos on stm32
Date: Fri, 21 Jul 2017 10:12:07 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

Hi Roman,

On Thu, Jul 20, 2017 at 11:29:48PM -0700, Roman wrote:
> Hello again, 
> I think the problem may be in  my modem driver
> <http://lwip.100.n7.nabble.com/file/n30206/modem.c>  . Maybe someone can
> check
> Regards, Roman

There is at least one obvious mistake here, but I'm pretty sure that's 
not what fail here. You are calling sys_timeout/sys_untimout functions 
outside the lwIP core thread, doing that is not thread safe. Other than 
that it looks pretty well engineered, you are using pppos_input_tcpip 
and so on, which is the right thing to do in your case.

I bet you are using the Socket or Netconn API in your task handling the 
TCP session, which is right either.

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