Pavel Piatruk’ tech & personal blog

Huawei E3372-325 'BROVI' and Linux (Ubuntu) - Stick mode.

How to get to work Huawei E3372-325 ‘BROVI’ in Linux (ubuntu) - Stick mode.

In Part1 I explained how to get it work in HiLink mode. For some reasons sometimes you need it in STICK mode.

Notes:

  • I could not get it to work in NCM mode (with controlling AT\CDC port and DHCP on a network card) so PPP mode was used.

/usr/local/bin/brovi_switch.X (make it executable!)

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
# vim: filetype=bash

#   2023-01-28 Pavel Piatruk, piatruk.by
# switches BROVI to STICK mode

ID=$$
echo $ID
USB_ID=$(basename $DEVPATH)

{
echo bInterfaceClass on ports as follows 
grep -H .  /sys$DEVPATH/1*/bInterfaceClass 
IC=$( grep -h .  /sys$DEVPATH/*:1.0/bInterfaceClass )
echo "got bInterfaceClass on 1st port $IC"
echo usb_modeswitch -b $BUSNUM -g $DEVNUM -v 3566 -p 2001

case $IC in
08) 
    echo Storage MODE
    usb_modeswitch -b $BUSNUM -g $DEVNUM -v $ID_VENDOR_ID -p $ID_MODEL_ID  -X
    ;;
e0)
    echo "Already RNDIS"
    ;;
ff)
    echo Serial Port
    ;;
*)
    echo Unknown mode
    ;;
esac

} | logger -t BROVI

exit 0

and UDEV script /etc/udev/rules.d/40-huawei.rules

ACTION!="add", GOTO="modeswitch_rules_end"
SUBSYSTEM!="usb", GOTO="modeswitch_rules_end"
#
## All known install partitions are on interface 0
ATTRS{bInterfaceNumber}!="00", GOTO="modeswitch_rules_end"
#
GOTO="modeswitch_rules_begin"

LABEL="modeswitch_rules_begin"
ATTR{idVendor}=="3566", ATTR{idProduct}=="2001", RUN+="/usr/local/bin/brovi_switch.X  %k %p"
LABEL="modeswitch_rules_end"

SUBSYSTEM=="net", ACTION=="add",  ATTRS{idVendor}=="3566", ATTRS{idProduct}=="2001", NAME="wwan_brovi"
# ignore AT ports on interfaces 2,4 for ModemManager cuz they stuck for some reason
SUBSYSTEM=="tty", ACTION=="add", DEVPATH=="*:1.[24]/*", ATTRS{idVendor}=="3566", ATTRS{idProduct}=="2001", ENV{ID_MM_PORT_IGNORE}="1"

After editing these 2 , replug the modem. Or when the modem is in, and is in CDROM mode, just run

usb_modeswitch  -v 3566 -p 2001  -X

So it will open its ports & 3 new tty devices will appear. If they don’t - tell the OS to bind this device

modprobe option
echo 3566 2001 ff > /sys/bus/usb-serial/drivers/option1/new_id

At this point AT ports are present. Check kernel logs.

Now you have 2 options to get online.

Option1. Use NetworkManager + ModemManager

Check output of mmcli -L , it shows smth like /org/freedesktop/ModemManager1/Modem/5 [ZOWEE TECHNOLOGY (HEYUAN) CO., LTD.] E3372-325.

Check verbose output from MM(ModemManager), it shows signal levels etc: mmcli -m 5

And nmcli dev shows ttyUSB1.

Create NM(NetworkManager) connection:

nmcli con add con-name BROVI_PPP ipv4.route-metric 3000 connection.type gsm ifname ttyUSB1
nmcli con modify BROVI_PPP ipv6.method disabled
nmcli con modify BROVI_PPP gsm.apn internet

it is started automatically when the modem appears.

Option2. use Wvdial.

create a file /etc/wvdial.conf

[Dialer Defaults]
Init1 = AT
Init3 = AT+CGDCONT=1,"IP","internet"
Init7 = AT+CGATT?
Init8 = AT+CGACT?

Phone = *99#
Username = { }
Password = { }
Modem Type = Analog Modem
ISDN = 0
New PPPD = yes
Stupid Mode = yes
Modem = /dev/ttyUSB1
Auto DNS = no
Baud = 9600

and run wvdial