<div dir="ltr">Hi Cyril,<div><br></div><div>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?</div><div><br></div><div>Regards,</div><div><br></div><div>Rogan</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 22 Jan 2021 at 12:54, Cyril HAENEL <<a href="mailto:chaenel@free.fr">chaenel@free.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
Hello, my name is Cyril HAENEL, and I am new on this mailing list :)<br>
I subscribed to this list because I was looking for informations on
Quectel LTE modem, and yesterday I found this fantastic video :
<a href="https://media.ccc.de/v/33c3-8151-dissecting_modern_3g_4g_cellular_modems#t=690" target="_blank">https://media.ccc.de/v/33c3-8151-dissecting_modern_3g_4g_cellular_modems#t=690</a><br>
<br>
I actually work on the Quectel LTE SC20 Smart module, which is
proposed with Android, but also Linux without all Android layers.<br>
We want to use the Linux version and we use the official Quectel
Linux SDK, based on Yocto.<br>
<br>
We can successfully build and flash the image in the module, no
problem from this side.<br>
<br>
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.<br>
<br>
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...<br>
<br>
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...<br>
We finally found and understood all methods they use (Shared Memory
Devices, qmuxd, qmi proxy, QMI protocol, etc.....).<br>
<br>
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 :(<br>
<br>
We flashed an Android version in the SC20 to see how it works, and
they have Android applications which connect to netmgrd, qmuxd,
etc....<br>
But we don't have these tools under Yocto Linux, so we wondering how
we can easily set our broadband connection.<br>
<br>
Any help or comment will be great :)<br>
<br>
Best regards,<br>
Cyril<br>
<br>
<br>
<br>
<br>
<br>
<pre cols="72">--
Cyril Haenel
Registered Linux User #332632
</pre>
</div>
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