Raspberry PI 4 + Huawei E3372 - Send AT commands

Question

I'm trying to send AT commands to a Huawei E3372 USB Dongle but I haven't figured out how to mount correctly.

If I do lsusb, I get the following:

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 045e:00cb Microsoft Corp. Basic Optical Mouse v2.0
Bus 001 Device 003: ID 03f0:034a HP, Inc Elite Keyboard
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The dongle is listed, I can also access it's configuration screen on 192.168.1.1 and I can access internet.

I have tried creating the config file:

sudo nano /etc/usb_modeswitch.d/12d1:14db

and entered the following configuration

TargetVendor=0x12d1
TargetProduct=0x14db

MessageContent="55534243123456780000000000000011062000000100000000000000000000"
NoDriverLoading=1

I have tried various configurations found on the web but none seems to work.

/dev/tty    /dev/tty19  /dev/tty3   /dev/tty40  /dev/tty51  /dev/tty62
/dev/tty0   /dev/tty2   /dev/tty30  /dev/tty41  /dev/tty52  /dev/tty63
/dev/tty1   /dev/tty20  /dev/tty31  /dev/tty42  /dev/tty53  /dev/tty7
/dev/tty10  /dev/tty21  /dev/tty32  /dev/tty43  /dev/tty54  /dev/tty8
/dev/tty11  /dev/tty22  /dev/tty33  /dev/tty44  /dev/tty55  /dev/tty9
/dev/tty12  /dev/tty23  /dev/tty34  /dev/tty45  /dev/tty56  /dev/ttyAMA0
/dev/tty13  /dev/tty24  /dev/tty35  /dev/tty46  /dev/tty57  /dev/ttyprintk
/dev/tty14  /dev/tty25  /dev/tty36  /dev/tty47  /dev/tty58
/dev/tty15  /dev/tty26  /dev/tty37  /dev/tty48  /dev/tty59
/dev/tty16  /dev/tty27  /dev/tty38  /dev/tty49  /dev/tty6
/dev/tty17  /dev/tty28  /dev/tty39  /dev/tty5   /dev/tty60
/dev/tty18  /dev/tty29  /dev/tty4   /dev/tty50  /dev/tty61

No more luck with dmesg | grep ttyUSB that returns nothing (same for USB0, USB1,...)

It's probably something wrong in the config file but I don't see exactly what needs to be done.

Any idea ?

Thanks!

Answer 1

You attach wrong lsusb output. The dongle is not listed.

Perhaps the device code 14db and accessible 192.168.1.1 looks like your modem is switched to newest mode where the dongle looks like router. If you would like to send AT command then you must change mode to serial. First of all try it through:

/etc/usb_modeswitch.conf

The last part of the file contain your desired option:

HuaweiAltModeGlobal=0

Notice the comment above this option:

...you can globally set an alternative method here which provides a different mode: either plain serial PPP...

Just try to change number. There should be around 6 modes and one of them will switch your dongle to serial mode.

Best luck.