Sim change event

[Zurab G]

Aleksander thank you for your detailed answer,
Devices you have mentioned look like embedded/oem solutions.
Do you know of any consumer grade USB modems with SIM hotplug and
modemmanager support?
You have also mentioned AT commands, are they standard or vendor specific?
I think qualcomm modem I've mentioned has serial and recieves AT
commands, but I couldn't register in the network with commands I've
found on the internet.
Regards, Zurab

On Thu, May 21, 2020 at 12:51 PM Zurab G <zurab.net at gmail.com> wrote:
>
> Aleksander thank you for your detailed answer,
> Devices you have mentioned look like embedded/oem solutions.
> Do you know of any consumer grade USB modems with SIM hotplug and
> modemmanager support?
> You have also mentioned AT commands, are they standard or vendor specific?
> I think qualcomm modem I've mentioned has serial and recieves AT
> commands, but I couldn't register in the network with commands I've
> found on the internet.
> Regards, Zurab
>
> On Thu, May 21, 2020 at 12:25 PM Aleksander Morgado
> <aleksander at aleksander.es> wrote:
> >
> > Hey!
> >
> > > Can you please suggest what is best way to change SIM card when using mmcli?
> > > My task is to execute some USSD codes on as many SIM cards as
> > > possible, I tried to use script with --3gpp-ussd-initiate and
> > > --3gpp-ussd-respond and it works, but I don't know how to change SIM
> > > card as fast as possible.
> > > Replugging device takes few minutes and it registers in the system as
> > > new modem (2,3,4, etc.) every time.
> > > --reset command has same drawbacks
> > > Does that depend on hardware? I'm using huawei E3531 in stick mode.
> >
> > Yes, it depends on hardware, not all modem support SIM hot plugging,
> > and even if they do, ModemManager doesn't support all the modems that
> > support hotplugging. Currently hotplugging is working for at least
> > Telit devices and all MBIM devices IIRC. I doubt that the E3531
> > supports hotplugging, but not sure.
> >
> > Why do you say that registering as a new modem (2,3,4..) is a problem?
> > That can be avoided using the sysfs path to refer to the modem, or
> > "naming" the device with a USB tag. In git master, mmcli also allows
> > using "mmcli -m any" to refer to the first modem found in the system;
> > if you only have one it'll work for you.
> >
> > >
> > > I'm also interested if your software supports "router mode" usb
> > > modems, I have qualcomm devices
> > > https://www.aliexpress.com/item/483621882.html
> > > But they don't work with mmcli.
> > >
> >
> > A modem that works in "router mode" will usually expose only a HTTP
> > webadmin for human users to use, no "machine friendly" control port.
> > In this case, ModemManager cannot do anything. That device you pointed
> > out is very likely working like that. Other modems out there like e.g.
> > notably the u-blox TOBY-L2/L4 for example work in router mode, but
> > they do provide an AT channel to communicate with the device, so
> > ModemManager can use them easily.
> >
> > --
> > Aleksander
> > https://aleksander.es