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Re: [lwip-users] PPPoS: ppp session disconnect if hit bad fcs for LCP pa
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From: |
Sylvain Rochet |
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Subject: |
Re: [lwip-users] PPPoS: ppp session disconnect if hit bad fcs for LCP packet |
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Date: |
Fri, 30 Jun 2017 18:18:33 +0200 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hi Axel,
On Fri, Jun 30, 2017 at 11:18:52PM +0800, Axel Lin wrote:
>
> BTW, my device always keep sending data to LTE through pppos.
> I'm wondering why the bad fcs usually happened on LCP packet.
What I can say is, since the PPP link is only between your MCU and your
LTE modem, which are probably a few centimers away on the same board,
having bad FCS should *NEVER* happen! Checksums are close to being
totally useless in this case, they are just here for protocol conformity
regarding HDLC.
Having bad FCS in this case means a software issue here, either on the
lwIP side or, most likely, on the LTE modem side.
Sylvain
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