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Re: [lwip-users] PPPoS : no response from modem after link established

From: Sylvain Rochet
Subject: Re: [lwip-users] PPPoS : no response from modem after link established
Date: Sat, 7 Jul 2018 22:41:46 +0200
User-agent: Mutt/1.5.23 (2014-03-12)


On Sat, Jul 07, 2018 at 07:40:01PM +0300, Sergey A. Borshch wrote:
> Hi.
> I want to use ppp connection via SIM800C GPRS modem.
> I use last lwIP sources from git HEAD.
> The problem is identical to to described at 
> https://lists.gnu.org/archive/html/lwip-users/2017-10/msg00084.html 
> (but there was no solution proposed)

I don't know how you managed to conclude that no solution was 
proposed... User had CHECKSUM disabled, see:

>  - modem stops responding after status_cb:
> connected. I checked twice with logic analyzer - there is to responses to
> frames with proto=0x21. I tried two SIM cards from different mobile
> providers (one requires authentication, the other not) with exactly same
> result - I can get IP, DNS etc but no data exchange.
> What did I missed to do?

Did you check that you are actually receiving IP packets on the remote 
side ?


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