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Re: [lwip-users] PPPoS TCP Connection Reject

From: Sergey A. Borshch
Subject: Re: [lwip-users] PPPoS TCP Connection Reject
Date: Thu, 2 Aug 2018 20:08:42 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 
On 08/02/2018 06:56 PM, gzayzay wrote:

Hi Sergey,

I'd verify that  CHECKSUM_BY_HARDWARE is not defined. From my debug logs, I
see that the devices seems to negotiate a PPP session successfully.


Actually CHECKSUM_BY_HARDWARE set 0 to CHECKSUM_GEN_xxx and CHECKSUM_CHECK_xxx.
Check that all of them are set to 1 in your project.
I had similar issue three weeks ago - correct connection establishment and no responses from GSM modem after that. The problem was missed checksum in network frames. Also see https://lists.gnu.org/archive/html/lwip-users/2017-11/msg00072.html 
Hope that helps.

--
Regards,
  Sergey A. Borshch            mailto: address@hidden
    SB ELDI ltd. Riga, Latvia
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