Re: [lwip-users] Weird PPP behavior

[Gennady Shmakov]

Sylvain,

Thank you very much for looking at it.

 

I'm a little worried about wrong checksum:

> pppos_input[0]: got 44 bytes

> pppos_input[0]: got 61 bytes
> pppos_input[0]: Dropping bad fcs 0x9e4f proto=0xc021
> pppos_input_drop: pbuf len=21, addr 2001afe8

I've compared log with bad fcs with log when everything goes fine.

In "ok" log I dont see extra 44 bytes at pppos_input at this point:

> pppos_input[0]: got 44 bytes

I've double checked my driver code to make sure I dont mistakenly throw any garbage to pppos_input_tcpip from USB stack.

And driver code looks ok. So seems like modem sends something lwip does not expect.

Sergio,

I'm using Huawei E3272 USB LTE modem.

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

On Mon, Feb 29, 2016 at 4:21 PM, Sergio R. Caprile <address@hidden> wrote:

> Long story short: your 3G modem firmware is written by monkeys.

Sylvain: ROTFL
I once had an argument with a (wannabe) developer and mentioned a phrase
quite similar to that one...

Gennady: Would you care to share your modem's brand name so we all avoid
it ? We are using SIMCOMs down here, but haven't checked their 3Gs yet.
Their PPP used to work OK against Rabbit's long time ago, on GPRS modems.


_______________________________________________
lwip-users mailing list
address@hidden
https://lists.nongnu.org/mailman/listinfo/lwip-users