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Re: [lwip-users] lwip with 4G modem
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From: |
Sylvain Rochet |
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Subject: |
Re: [lwip-users] lwip with 4G modem |
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Date: |
Tue, 12 Oct 2021 19:04:20 +0200 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hi,
On Tue, Oct 12, 2021 at 11:29:46AM +0200, Gisle Vanem wrote:
> Giuseppe Modugno wrote:
>
> >The serial channel for ppp/data and AT commands is single, so how can I
> >multiplex them? Should I use CMUX?
>
> The PPP protocol handles this multiplexing itself. Using an
> escape octet "stuffing procedure" (octet 0x7d).
> Read 'https://datatracker.ietf.org/doc/html/rfc1662' for the gory
> details.
I doubt most cellular modems support that. CMUX support (GSM 07.10) is
more common.
Sylvain
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