Sim card not detected

IoT Modules MC/EM Series
1

Hi everyone,
I currently have a pc with a Sim slot, and whether it’s plugged in, it says “State : failed” because of sim missing. How can I fix it ?
Best regards,
Onelots.

2

Hi onelots,

Welcome you to our community. What is the output of the commands below?
ATI3
ATI9
AT+CPIN?
AT!UIMS?

3

Hi Donald, thank you for your answer.
I just made these ( mmcli -m 0 --command=“ATI3” then the others) and I got this error message :

error: command failed: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unauthorized: Cannot send AT command to modem: operation only allowed in debug mode'

Regards,
Onelots.

4

Hi onelots,

You can try using dev/ttyUSB2 AT command port to type AT command.
sudo minicom -D /dev/ttyUSB2

5

You can avoid that if you run ModemManager in debug mode (with --debug), see Debugging | ModemManager

6

Make sure to stop ModemManager completely if you plan to use minicom directly on the ttyUSB2; e.g. sudo systemctl stop ModemManager (if using systemd)

7

What’s the output of these commands? (no need to stop ModemManager)

sudo qmicli -d /dev/cdc-wdm0 -p --uim-get-card-status
sudo qmicli -d /dev/cdc-wdm0 -p --uim-get-slot-status
8

systemctl stop ModemManager

IIRC this won’t stop NM from restarting MM on demand. To avoid this, better use systemctl mask ModemManager (and unmask afterwards).

9

Masking the service in systemd should not be required. If systemd is being used, NetworkManager just follows the lifecycle of ModemManager; if systemd is not used, NM will poke MM to try to auto-start it via DBus activation; see src/core/devices/wwan/nm-modem-manager.c · main · NetworkManager / NetworkManager · GitLab

If systemd is not being used, the easiest way to avoid NetworkManager auto-starting ModemManager is to just move the MM daemon binary somewhere else, e.g. see Debugging | ModemManager

@stefanbruens if this is not the case in your setup, let us know in fd.o gitlab to see if there is anything that has to be fixed!