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.


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