[lwip-users] PPP Failing Network Phase with Telit LE910-V2 on AT&T

[Christopher Stocker]

I’m having issues getting the Telit LE910-V2 boarded on AT&T working with the lwIP stack, however I have one other modem based on the Gemalto ELS31 and Telit LE910-V2 board on Verizon that work without issue. I’ve also been able to get the AT&T modem to work over PPP with Linux so I know at least the mode works. Durning inttial development I was also able to get the PPP working with a Telit DE910. I’ve been searching the mailing list for a while but so far I haven’t found anything similar.

The connection fails after the stack gets to phase 9 and sends the first IPCP ConfReq and the modem responds with a LCP ConfReq and causes LCP code to set the link to down and return to phase 6. The Verizon version of the modem on the other hand responds to the IPCP ConfReq with an IPCP packet so it works fine.

The modem does not require authentication but I enable the compile options in lwIP for PAP, CHAP, and MSCHAP but the stack just moves past phase 7 without doing anything so I assume that’s correct. I also enable CCP but that did resolve the issue.

I’ve attached 3 logs, 2 are the lwIP PPP debug outputs of the AT&T and Verizon Telit  LE910-V2 modems. The third is the debug output of the Linux command to start the PPP session.

I've also reached out the manufacture to try and get more information about why the behavior is different between the two carriers but so far all I've gotten back so far is "Works on Linux so it's fine".

lwIP v2.0.3

FreeRTOS 10.0.0

MCU: STM32F437IG

 

Any help with this would be greatly appreciated.

 

Chris

Telit LE910-V2 ATT Linux PPP.txt
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Telit LE910-V2 ATT PPP Log.txt
Description: Text document

Telit LE910-V2 Verizon PPP Log.txt
Description: Text document