Yeah, my thinking is that there is a Linux daemon that implements the QMI interface over USB, as well as the USB-Serial interface.

Figure out where that is, then check to see how it is implemented - perhaps just a relay to a UART on the DSP, or a message box, or whatever.

Then figure out how to replicate that in a way that you can run e.g. NetworkManager locally.

Rogan

On Mon, 25 Jan 2021 at 14:25, Harald Welte <laforge@osmocom.org> wrote:

Hi Cyril,

good to hear from you and your experience.

I myself unfortunately have never worked on the (much more complex) "smart"
Quectel modems (SCxx), just on the regular ECxx series.

It's indeed quite odd that they provide a "plain Linux" yocto based SDK
but then have no information whatsoever on how to talk to the modem ;)

Maybe the people behind https://github.com/bacnh85/Docker_Quectel_SC20_Linux
have an idea?

I would normally expect that there is either some way to access AT commands,
or to access QMI. Once you reach either of the two, you can then use ofono,
modemmanager or the like.

--
- Harald Welte <laforge@osmocom.org> http://laforge.gnumonks.org/
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