These are mostly notes for my self, but may be useful for others.
other pages say this only works with a sim inserted, it doesn't need to have an active registration though
# lsusb
0bdb:1926 Ericsson Business Mobile Networks BV
kernel modules are needed, since I did not find any documentation, these are in use on my system:
CONFIG_USB_NET_CDC_MBIM
CONFIG_USB_NET_CDC_NCM
CONFIG_USB_WDM
CONFIG_USB_ACM
Not sure if this is needed, but it works with it being there
# cat /etc/modprobe.d/cdc_ncm.conf
options cdc_ncm prefer_mbim=N
ModemManager needs to be running, so
# systemctl enable ModemManager; systemctl start ModemManager
disable the pin on the sim
# mmcli -i 0 --pin=1234 --disable-pin
then we can activate gps via mmcli for testing:
# mmcli -m 0 --location-enable-gps-nmea
# mmcli -m 0 --location-enable-gps-raw
# mmcli -m 0 --location-get
this should ouptut stuff, once you have a fix you should get a longitude and latitude in the raw section
if you want gui stuff to work:
disable nmea and raw gps, activate unmanaged:
# mmcli -m 0 --location-enable-gps-unmanaged
this allows gpsd to open /dev/ttyACM2, while the modemmanager activates stuff on the control device (ttyACM1)
for testing without forking "-N"
# gpsd -N /dev/ttyACM2
then you need to start a client like foxtrotgps
after that, not before! you have to
# echo -e "AT*E2GPSNPD\r" >/dev/ttyACM2
to persuade the modem to really start giving you values
once you close the client (foxtrotgps) however, gpsd closes the device, which means you have to do the echo stuff again after you connect a client
