[lwip-users] PPPos does not detect modem disconnection

[vinimac]

Hi all,

I am simulating a signal loss by removing the antenna from the modem and it
keep sending packets to a server using TCP socket. After remove the antenna,
the function send wont fail() and error number is not set too. 

I was expecting TCP layer to detect the lack of TCP ACK or PPP should have
some timeout? 

I am running Lwip 2.0 from ESP32 SDK.
/*/
HISTORY
(git master)
  ++ New features:
  2016-02-22: Ivan Delamer:
  * Initial 6LoWPAN support
/***/




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Re: [lwip-users] PPP CHAT failed

[vinimac]

Sylvain Rochet wrote
> As well, it seems your UART tx routine does not work properly, there are 
> way too much LCP retries, as if the remote end never get most packets.

I was thinking about what you said and makes sense. These are the LCP
ConfReq sent by Lwip
and the possible replies from PPP server:

/sent [LCP ConfReq id=0x1   
]
rcvd [LCP DiscReq id=0x12 magic=0xf68ac785]

sent [LCP ConfReq id=0x1]
rcvd [LCP DiscReq id=0x14 magic=0xf68adef1]

sent [LCP ConfReq id=0x1]
... no reply?

sent [LCP ConfReq id=0x1]
rcvd [LCP ConfAck id=0x1]
netif_set_mtu[0]: mtu=296

rcvd [LCP DiscReq id=0x1b magic=0xf68af65e]
(maybe reply from third LCP ConfReq)?/

Looks like the PPP server is receiving wrong bytes like id and magic number.
Because the reply does not match the request. I will check this carefully.



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Re: [lwip-users] PPP CHAT failed

[vinimac]

Sylvain Rochet wrote
> It looks like there is an issue in your low level UART driver, there are 
> quite a lot of dropped frames due to bad FCS/ACCM drop, it can happen of 
> course from time to time, very unlikely though for a given try, and 
> never that much !
> 
> As well, it seems your UART tx routine does not work properly, there are 
> way too much LCP retries, as if the remote end never get most packets.
> 
> Sylvain

I really had a hard time calling pppos_input() or pppos_input_tcpip()
passing data byte after byte.
Every time I got bad FCS. So I had to handle the UART input and delivery
the whole PPP frame with 0xFE .. 0xFE to pppos_input. After that something
started to work. 

But that is really weird because the AT commands work very well, even with 
ECHO on. 

Log with UART TX
ppp_02.log   



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[lwip-users] PPP CHAT failed

[vinimac]

Hi,

I am using Lwip 2.0.3+FreeRTOS 10 and PPPoS with CHAP MD5 authentication.
The PPP negociation proceeds until stop in CHAP Challenge/CHAP Response. I
am using the same name/secret on Linux and works!

Log attached. 
ppp.log   



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Re: [lwip-users] LWIP+PPPos(GPRS)

[vinimac]

*I am designing a gateway and on my ATSAME53N20 (Atmel studio 7 IDE) I have
to connect a 3G modem(Quactel UG95) using a serial port. I can communicate
with the modem using AT commands. Now, I would like to use PPPos (PPP over
serial) library from LWIP 2.03 to enter in PPP mode. FreeRTOS has to
implement as this project will be running in a threaded environment.

Hi. This example helped me a lot:  pppos_client_main.c

 
.

It is working very good, but it is not processed through CHAP negotiation. 



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