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(a)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=…
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
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