[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 #46 from Oleg Uzenkov <o.uzenkov@unicore.co.ua> ---
Hi Ilija,

Thanks for your advice. I will do what you suggested. If the upgrade is
successful I will upload it here. 

As to the work of PPP in the vanilla lwip 1.4.1, when trying to connect, quite
often I used to receive the following debug log:

++++++++++++++++++++++

[DEBUG] Initializing PPP
lcp_init: xmit_accm=0 0 0 0
upap_init: 0
pppOverSerialOpen: unit 0: Connecting
pppStart: unit 0
ppp_set_xaccm[0]: outACCM=0 0 0 0
ppp_send_config[0]: outACCM=FF FF FF FF
ppp_recv_config[0]: inACCM=0 0 0 0
lcp_lowerup: asyncmap=0 0 0 0
LCP: lowerup state 0 (LS_INITIAL) -> 2 (LS_CLOSED)
auth_reset: 0
lcp_addci: L opt=2 0
lcp_addci: L opt=5 2FF6F209
lcp_addci: opt=7
lcp_addci: opt=8
pppWrite[0]: len=46
fsm_sdata(LCP): Sent code 1,1,20.
LCP: sending Configure-Request, id 1
LCP: open state 2 (LS_CLOSED) -> 6 (LS_REQSENT)
pppStart: finished
LCP: timeout resending Config-Request state=6 (LS_REQSENT)
lcp_addci: L opt=2 0
lcp_addci: L opt=5 2FF6F209
lcp_addci: opt=7
lcp_addci: opt=8
pppWrite[0]: len=45
fsm_sdata(LCP): Sent code 1,1,20.
LCP: sending Configure-Request, id 1
LCP: timeout resending Config-Request state=6 (LS_REQSENT)
lcp_addci: L opt=2 0
lcp_addci: L opt=5 2FF6F209
lcp_addci: opt=7
lcp_addci: opt=8
pppWrite[0]: len=45
fsm_sdata(LCP): Sent code 1,1,20.
LCP: sending Configure-Request, id 1
LCP: timeout resending Config-Request state=6 (LS_REQSENT)
++++++++++++++++++++++++++++++

(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.

But when I started using GPRS VPN service from my cellular network provider
this problem has not shown up yet. I have tested it several times and there was
always  a successfull connection. So I believe now, the problem was related to
the quality of service and not to the PPP (1.4.1) implementation.

Oleg

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