Re: [lwip-users] PPPoS TCP Connection Reject

[Patrick Klos]

On 8/1/2018 3:18 PM, gzayzay wrote:
> Hello Patrick,
>
> Thanks for the feed back. Per your input, there are few issues that I did
> like to clarify.
> 1. I have a single UART and I don't believe that I could be tapping the
> wrong line. During PPP negotiations, I do see the data on the logic
> analyzer. Once IP address has been received, I no longer see incoming data
> on the logic analyzer/
>
> 2. I am also convince that the incoming data never gets on the UART after
> connection for the LWIP stack to handle it.
>
> 3. When I halt the microcontroller and send ping to the IP address, the
> device is still responding to the pings which levels me to believe that the
> modem is responding instead of the LWIP stack since the micro is not
> running.

Very important piece of information there.  That's good to know!

> 4. By transparent passing, I meant, the data should not be process
> internally by the modem but instead sent over the UART channel and allow the
> LWIP stack to handle all processing.

If that is the case, then you'll need to figure out how to get the modem 
to stop intercepting the data and/or packets.  That has nothing to do 
with PPPoS or LwIP - that sounds like a modem specific behavior you 
would need to disable in the modem.  What modem are you using?

Patrick Klos
Klos Technologies, Inc.