João M. S. Silva joao.m.santos.silva at
Wed Nov 25 11:17:19 PST 2015

Thanks for the enlightening answer. Which file do I need to edit under 
/etc/udev/rules.d/ to set that configuration?

Is it a file like this one?

João M. S. Silva

On 11/24/2015 08:32 PM, Aleksander Morgado wrote:
> On Thu, Nov 12, 2015 at 11:54 PM, João M. S. Silva
> <joao.m.santos.silva at> wrote:
>> Forgive me if I already asked this, but I've searched and I think I haven't:
>> Does MM work with SIM800L?
> It may work with the generic AT+PPP based implementation, but not sure
> if anyone has tested it.
>> Through serial port (ttyS4, for instance)?
> If the modem provides a plain RS232 interface, you can connect it to a
> physical serial port of the system, yes. BUT in this case, you need to
> manually flag the specific TTY in udev with the
> "ID_MM_PLATFORM_DRIVER_PROBE" property set to TRUE. Platform TTYs are
> not probed by default.
>> Through USB port (ttyUSB0, with serial-to-USB converter PL2303)?
> You could also do this, if the modem provides a plain RS232 interface,
> yes. In this case, the USB serial port adapter should be in a
> "greylist" so that automatic probing ignores the TTY. You can request
> a explicit manual scan, which will include the ports in the greylist,
> with e.g. "mmcli --scan-modems".
>> How do I know if ttyS4 ou ttyUSB0 use dbus?
> Those TTYs will be plain TTYs. ModemManager will read from them as any
> other serial port. The key point here is make ModemManager
> automatically probe the TTY, which for RS232 is never automatic (in
> order to avoid trying to probe non-modem devices like e.g. screen
> readers for the visually impaired).

More information about the ModemManager-devel mailing list