Add script handling on modem detection

[Dylan Van Assche]

Hello,

On 5/07/2023 15:22, Florian Eckert wrote:
> Hello,
>
> I am using the modemmanager on openwrt (master).
> While playing around, I noticed that it might be useful to trigger
> an event after the modemmanager has detected a modem.
> We already use '/usr/lib/ModemManager/connection.d' one a successful 
> connection.


There's already such interface, but it is not one provided by 
ModemManager, but ModemManager re-uses one from Freedesktop. You can 
watch for new modems by using the Freedesktop ObjectManager:

https://www.freedesktop.org/software/ModemManager/api/latest/ref-dbus-standard-interfaces-objectmanager.html


>
> Background:
> I use an APU3 with an EC25, which supports one SIM slot.
> However, the APU3 has two sim slots that are switched via a GPIO pin.
> After switching, I have to restart the modem so that it recognizes the 
> new SIM.
> Now it would be good if I could change the SIM credentials after the 
> modemmanager
> has been detected the rebooted modem and tell the netifd to reestablish
> the connection with an 'ifup wwan'.
>
> So far I only see the event in the syslog.
>
> Wed Jul  5 15:06:41 2023 daemon.info [5863]: <info>  [device Modem1] 
> creating modem with plugin 'quectel' and '6' ports
> Wed Jul  5 15:06:41 2023 daemon.info [5863]: <info> [base-manager] 
> modem for device 'Modem1' successfully created


Kind regards,
Dylan Van Assche