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Gammu

Instructions on setting up Gammu via a Docker container running sms2mqtt using a Huawei E3372h USB-stick LTE-modem.

Activate SIM-card

Easiest way to activate is to simply put it in a mobile phone.

Disable the SIM PIN and send one SMS message to ensure it's properly activated. I haven't been able to get Gammu to accept the PIN (as such, disabling it seems to best/easiest solution).

The lights on the Huawei-stick have the following meaning:

  • Green (slowly blinking) — connecting
  • Blue (slowly blinking) — connected

Setup Huawei-stick

apt install usb-modeswitch

Find the Huawei-stick and use its vendor ID and product ID to setup a udev rule:

lsusb -vt

📄 /etc/udev/rules.d/10-gsm-modem.rules

ACTION=="add" \
, ATTRS{idVendor}=="12d1" \
, ATTRS{idProduct}=="1f01" \
, RUN+="/sbin/usb_modeswitch -X -v 12d1 -p 1f01"

USB mode-switch will switch the stick from h (Hisense) mode into s (stick) mode and provide a plain LTE-modem over USB. In Hisense-mode, a local network adapter with a local HTTP server is used as bridge instead (more convenient for end-user, not suitable for Gammu). It is also possible to reflash the firmware (a bit of a hassle), so this mode-switch is easier...

More details:

Test Gammu

Once the stick is properly setup, restart the machine. It appears executing the mode-switch command manually works but somehow doesn't add the USB modem.

Note that installing Gammu on the local machine is only required for testing purposes. Once setup properly, Gammu will run inside a Docker container...

apt install gammu

Find the TTY to use:

ls -l /dev/*USB*

Or better, use the below to find a "fixed" reference to the modem:

ls -l /dev/serial/by-id/

There are three Huawei devices listed: if00, if01 and if02. if01 Does nothing, if02 works but is very slow, if00 appears to be the one to use...

📄 ~/.gammurc

[gammu]
device = /dev/serial/by-id/usb-HUAWEI_MOBILE_HUAWEI_MOBILE-if00-port0
connection = at

gammu identify gammu networkinfo
gammu sendsms TEXT 0123456789 -text "Hello World!"

Potential conflict with SNMPd

After setting up the Huawei-stick, snmpd started crashing every couple of days with the following message:

Aug 23 21:21:40 pi4 snmpd[1897]: IfIndex of an interface changed. Such interfaces will appear multiple times in IF-MIB.
Aug 23 21:21:40 pi4 snmpd[1897]: ioctl 35111 returned -1
Aug 23 21:21:40 pi4 snmpd[1897]: ioctl 35091 returned -1
...
Aug 25 17:48:02 pi4 snmpd[1897]: ioctl 35091 returned -1
Aug 25 17:48:02 pi4 snmpd[1897]: ioctl 35105 returned -1
Aug 25 17:53:05 pi4 snmpd[1897]: error on subcontainer 'ifTable container' remove (-1)
Aug 25 17:53:08 pi4 systemd[1]: snmpd.service: Main process exited, code=killed, status=11/SEGV
Aug 25 17:53:08 pi4 systemd[1]: snmpd.service: Failed with result 'signal'.

Seemed too much of a coincidence to not be related to the Huawei-stick. Solution seems to be to remove the wwan0 interface (exposed by the Huawei-stick) from the system:

udevadm info --path=/sys/class/net/wwan0
udevadm test --action="add" /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.4/1-1.4:1.3/net/wwan0 2>&1 | less

Source: https://unix.stackexchange.com/a/467085