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

[Patrick Klos]

On 3/27/2018 3:17 PM, Sylvain Rochet wrote:
> Hi,
>
> On Tue, Mar 27, 2018 at 06:52:44AM -0700, bakmurat wrote:
> > *Modem transmits the following data:
> > CONNECT 7200000
> > ~ÿ}#À!}!}!} }8}"}&} } } } }#}$À#}%}&R}8}0D}'}"}(}"™Ë~...  ...~ÿ}
> > #À!}!}!} }8}"}&} } } } }#}$À#}%}&R}8}0D}'}"}(}"™Ë~
> > NO CARRIER
> "NO CARRIER" indicate a failure, are you sure pre-PPP stage actually
> work ?

Without timestamps on the data, it's hard to pin down exactly what's 
happening.

It looks like the modems connected, then your device received some 
serial data (which are apparently the PPP packets), followed by a 
disconnect (likely due to not getting answers to the packets the other 
side sent after a reasonable amount of time)?

Can you log the data your device is trying to send over the modem as 
well?  (and dumping the serial data in hex would make decoding the 
packets a lot easier)

Patrick Klos
Klos Technologies, Inc.