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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