From chaenel at free.fr  Fri Jan 22 10:54:59 2021
From: chaenel at free.fr (Cyril HAENEL)
Date: Fri, 22 Jan 2021 11:54:59 +0100
Subject: Quectel SC20 / Yocto Linux
Message-ID: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>

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From rogan at dawes.za.net  Fri Jan 22 11:31:38 2021
From: rogan at dawes.za.net (Rogan Dawes)
Date: Fri, 22 Jan 2021 13:31:38 +0200
Subject: Quectel SC20 / Yocto Linux
In-Reply-To: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
References: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
Message-ID: <CAOYdKdhvnRit8t2Nk9e1G1vCCEzpk1y89k339LtwtyVjKykK1g@mail.gmail.com>

Hi Cyril,

I am also interested in building my own applications into a self-contained
unit, so would be keen to collaborate with you on this. My target is a
D-Link DWM222-A2 LTE dongle. Is your module based on the same MDM9625 core,
or something else?

Regards,

Rogan


On Fri, 22 Jan 2021 at 12:54, Cyril HAENEL <chaenel at free.fr> wrote:

> Hello, my name is Cyril HAENEL, and I am new on this mailing list :)
> I subscribed to this list because I was looking for informations on
> Quectel LTE modem, and yesterday I found this fantastic video :
> https://media.ccc.de/v/33c3-8151-dissecting_modern_3g_4g_cellular_modems#t=690
>
> I actually work on the Quectel LTE SC20 Smart module, which is proposed
> with Android, but also Linux without all Android layers.
> We want to use the Linux version and we use the official Quectel Linux
> SDK, based on Yocto.
>
> We can successfully build and flash the image in the module, no problem
> from this side.
>
> But the goal of this module is not to be used just as an LTE modem for an
> external host, it's a standalone module and we embed our IoT application
> inside.
>
> The problem we are facing is that we don't know how to start a broadband
> connection !! There is absolutely no Quectel documentation about that, and
> their support is really bad, they don't help us at all...
>
> So we done some reverse engineering to understand how the internal Modem
> is connected to main processor, how to send him AT command, how to start
> data connection, etc...
> We finally found and understood all methods they use (Shared Memory
> Devices, qmuxd, qmi proxy, QMI protocol, etc.....).
>
> But we are stuck to the same point, we don't find any easy way with
> scripts or some utilities with config file (to set the APN for example) to
> start a broadband connection :(
>
> We flashed an Android version in the SC20 to see how it works, and they
> have Android applications which connect to netmgrd, qmuxd, etc....
> But we don't have these tools under Yocto Linux, so we wondering how we
> can easily set our broadband connection.
>
> Any help or comment will be great :)
>
> Best regards,
> Cyril
>
>
>
>
>
> --
>
> Cyril Haenel
> Registered Linux User #332632
>
> _______________________________________________
> qc-linux-modems mailing list
> qc-linux-modems at lists.osmocom.org
> https://lists.osmocom.org/mailman/listinfo/qc-linux-modems
>
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From chaenel at free.fr  Fri Jan 22 12:18:48 2021
From: chaenel at free.fr (Cyril HAENEL)
Date: Fri, 22 Jan 2021 13:18:48 +0100
Subject: Quectel SC20 / Yocto Linux
In-Reply-To: <CAOYdKdhvnRit8t2Nk9e1G1vCCEzpk1y89k339LtwtyVjKykK1g@mail.gmail.com>
References: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
 <CAOYdKdhvnRit8t2Nk9e1G1vCCEzpk1y89k339LtwtyVjKykK1g@mail.gmail.com>
Message-ID: <dd162864-4fb6-b433-6469-6bfdc931fd1b@free.fr>

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From laforge at osmocom.org  Mon Jan 25 12:25:48 2021
From: laforge at osmocom.org (Harald Welte)
Date: Mon, 25 Jan 2021 13:25:48 +0100
Subject: Quectel SC20 / Yocto Linux
In-Reply-To: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
References: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
Message-ID: <YA64zI4MmUk7IDjB@nataraja>

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 at osmocom.org>            http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)


From rogan at dawes.za.net  Mon Jan 25 12:43:54 2021
From: rogan at dawes.za.net (Rogan Dawes)
Date: Mon, 25 Jan 2021 14:43:54 +0200
Subject: Quectel SC20 / Yocto Linux
In-Reply-To: <YA64zI4MmUk7IDjB@nataraja>
References: <f3c3b1c5-5a8f-319f-633e-b0bebd638e10@free.fr>
 <YA64zI4MmUk7IDjB@nataraja>
Message-ID: <CAOYdKdh6Dim9v2090y8oLb7vxXWpnRxoyvT6s4qLDY+yXOK=kg@mail.gmail.com>

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 at 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 at osmocom.org>
> http://laforge.gnumonks.org/
>
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                   (ETSI EN 300 175-7 Ch.
> A6)
> _______________________________________________
> qc-linux-modems mailing list
> qc-linux-modems at lists.osmocom.org
> https://lists.osmocom.org/mailman/listinfo/qc-linux-modems
>
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