Hi,
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: https://lists.gnu.org/archive/html/lwip-users/2017-11/msg00072.html > - 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 ? Sylvain
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