[Bug 1001873] Patches to upgrade lwip to 1.4.1

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001873

--- Comment #49 from Ilija Kocho [ÐÐÐÑÐ ÐÐÑÐ] <ilijak@siva.com.mk> ---
(In reply to comment #48)
> Ilija,
> 
> (In reply to comment #47)
> > Oleg
> > 
> > (In reply to comment #46)
> > 
> > Thank you for your report. I have some additional questions.
> > 
> > > Hi Ilija,
> > > 
> > 
> > [SNIP]
> > 
> > > 
> > > (This is just a snipet from the log.)
> > > Apparently, it meant that I did not receive anything from GPRS modem through
> > > the serial port. That happened quite often, however, successful connection
> > > did happen also.
> > 
> > What was your serial line setting: baud rate, (hardware) handshaking ?
> 
> Serial settings: 9600, 8N1 (no hw/sw control)

I recommend you to try HW control. In our company we had no problems with 9600
(Kinetis K70) but on higher baud rates there were problems. 
Also, below I learn that your lwIP is in simple mode that is different than our
configuration.

[SNIP] Note:I do not throw your example away, just little-bit redundancy
control.

> We do need to port ppp-new branch to ecos as judging from the author's
> comments it is more stable than the ppp implementation in vanilla 1.4.1 ppp
> stack (link:
> http://lists.gnu.org/archive/html/lwip-users/2014-03/msg00061.html)

Possibly.

FYI we are testing current lwIP 1.4.1 and it seems to work. We experienced
problems on higher baud rates.

Ilija

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