Il 12/10/2021 11:29, Gisle Vanem ha scritto:
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.
So will I be able to send AT commands (for example to make a voice call
or read SMS) and receive/send bytes of data connection, over the same
serial link?
Last question. If I have 4G modem and Ethernet PHY, is lwip able to
manage two network interface at the same time?
Sure.
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