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From: | Giuseppe Modugno |
Subject: | Re: [lwip-users] lwip with 4G modem |
Date: | Tue, 12 Oct 2021 12:52:23 +0200 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 |
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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