Re: [lwip-users] Weird PPP behavior

[Gennady Shmakov]

Sergio,

I see your concerns and I agree to everything you mentioned.

I don't have equipment (and knowledge) to check if USB hardware works 100% correct (I'm using STM32 mc).

This is VCP host written by me and as long as it get connected to internet it works stable.

Problem I described is only happen during connection phase and it's floating problem - only happen in about 30% cases, means in 70% connection attempts everything connects just fine and after that works (receiving and transmitting megabytes of data) for many hours without any issues.

I hoped there could be an easy fix somewhere in lwipopts, but this seems not the case.

I will look deeper in bytes that travels over the USB and see if I can find anything interesting.

-----
Regards,
Gennady
mob. +7 985 8181210

On Mon, Feb 29, 2016 at 7:48 PM, Sergio R. Caprile <address@hidden> wrote:

Looks like we've got someone else to blame...

So you have a modem vía USB... you don't have PPP over serial, you have
PPP over something over USB.

What is it, VCP ? with host drivers written by... (you ?) that you know
works OK because... (?) And, btw, the USB hardware is OK ? (USB
transfers are CRC "protected" but...)

I guess you should see why there are two packets when there is a bad
fcs. It is the only moment when it happens. Looks like "someone" got
interrupted and didn't finish a transfer, lost state, and then resumed
with some missing bytes in the middle, causing an fcs failure.
Check your USB statistics, maybe transfer errors are firing something
unexpected.

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