Re: ttyUSB* device for ModemManager

[TechnoStab <technostab gmail com>]

Thanks Dan,

I am using ZTE MF100 3g modem. I can see udev rules for the same modem 
in /lib/udev/rules.d/77-mm-zte-port-types.rules.

ATTRS{idProduct}=="0031", ENV{.MM_USBIFNUM}=="03", 
ENV{ID_MM_ZTE_PORT_TYPE_MODEM}="1"
ATTRS{idProduct}=="0031", ENV{.MM_USBIFNUM}=="01", 
ENV{ID_MM_ZTE_PORT_TYPE_AUX}="1"

From the log, modem manager obtains two usb ports /dev/ttyUSB1 and 
/dev/tyUSB2 but /dev/ttyUSB3 does not exist that it should be.

As you said, from windows its very easy to figure out what interface is 
being used by modem and it also shows it's 3.

Jaymin

On Tuesday 22 November 2011 01:34 AM, Dan Williams wrote:
> On Mon, 2011-11-21 at 15:13 +0530, Jaymin Patel wrote:
>    
> > Hello,
> >
> >
> > I am using modem that is not detected as /dev/ttyUSB0 instead its
> > detected as /dev/ttyUSB1. Want to know how ModemManager selects
> > ttyUSB* device for Mobile Broadband connection.
> >      
> MM selects the first port that passes probing as the main port (except
> for Huawei modems where it always uses USB interface 0), unless it's
> been "tagged" according to the udev rules.  Some modems only allow PPP
> on specific USB interfaces, and for those we have to find the Windows
> driver and look at the .INF files for which interface is supposed to be
> the "modem" or PPP interface.  Note that USB interface numbers don't
> directly correspond to the X in ttyUSBx (or ttyACMx).
>
> What modem is it that you're having trouble with?  It may be as simple
> as getting the Windows driver and figuring out what the port mapping is
> supposed to be.
>
> Dan
>
>
>
>