Re: [lwip-users] PPPoS: ppp session disconnect if hit bad fcs for LCP packet

[Patrick Klos]

On 6/30/2017 11:18 AM, Axel Lin wrote:
> It's not easy to hit this issue, usually it needs to run for a couple
> hours or more than one day.
> But the symptom seems to be the same.
>
> BTW, my device always keep sending data to LTE through pppos.
> I'm wondering why the bad fcs usually happened on LCP packet.

Can you dump out the failing LCP packet?  And maybe a few of the 
preceding packets?  What kind of connection do you have between the 
micro running lwip and the LTE modem?  Is there any way to tap that 
serial link and watch it to compare that against your micro's serial 
receive routine?

Patrick Klos
Klos Technologies, Inc.