Netgear 340u

[Bjørn Mork]

AT commands over MBIM is a vendor specific service, if implemented. I don't think that is likely on the 340u because we haven't seen it on any other Qualcomm based sierra device. But you never know.

Exploring MBIM is interesting in itself. And building libmbim shouldn't be more complicated than building libqmi.


Bjørn

On 5 May 2014 07:59:06 CEST, Noah Taber <noahtaber at gmail.com> wrote:
>Yes, the 340u is detected using mbim.  I don't think there's a native
>mbim
>package for the raspberry pi.  I'll work on compiling that later this
>week.
>
>Does anyone know how to send AT commands with mbim on any system
>(linux,
>osx, windows 7/8, etc.)?
>
>Thanks.
>
>Noah
>
>
>On Sun, May 4, 2014 at 1:08 PM, Bjørn Mork <bjorn at mork.no> wrote:
>
>> That's comp14. Not the same as 9, I'm afraid.
>>
>> But the modem is of course not useless even if it is locked to MBIM
>only.
>> Install libmbim and take it from there.
>>
>>
>> Bjørn
>>
>> On 5 May 2014 01:00:34 CEST, David McCullough <
>> david.mccullough at accelecon.com> wrote:
>> >
>> >Bjørn Mork wrote the following:
>> >> Noah Taber <noahtaber at gmail.com> writes:
>> >>
>> >> > Well, I think I'm done with the 340u.  I'm pretty sure I broke
>it
>> >tonight.
>> >> >  I ran the following AT command:
>> >> >
>> >> > AT!UDUSBCOMP=9
>> >> >
>> >> > I only have a MBIM interface to the device.  I cannot connect to
>it
>> >through
>> >> > serial to issue anymore AT commands.
>> >> >
>> >> > Do any of you have any hints?  Otherwise, I'll get a different
>> >device.
>> >>
>> >> Shit.  I was just writing you an email where I tried to warn about
>> >> exactly that.  Sorry.
>> >>
>> >> I am pretty sure there is some way to fix it, but we just don't
>know
>> >> how.  These settings are most likely stored in some NVRAM
>variable.
>> >> One nice thing about that MBIM function is that it implements a
>QMI
>> >pass
>> >> through, so you still have all the power of QMI available.  So if
>we
>> >> knew how to fix this by using QMI, then it could be fixed.  It is
>> >> probably possible to force the modem into boot loader mode, where
>you
>> >> should be able to rewrite most of the flash contents including the
>> >> NVRAM.
>> >>
>> >> In theory.  I wouldn't know how to do that.
>> >
>> >It should be ok,  all the 340u I have dealt with are in mode '9' and
>> >only
>> >present the MBIM interface.
>> >
>> >Under linux they present two configurations, and the MBIM interface
>is
>> >configration '2'.
>> >
>> >All i even do to get these modems operating is change them to
>> >configuration '1'.
>> >
>> >Find the correct /sys/bus/usb/devices/.../bNumConfigurations for
>your
>> >340u (the idProduct and idVendor files in the same directory will
>> >help).
>> >
>> >If this is working like I usually see, bNumConfigurations will be 2
>and
>> >bConfigurationValue will be 2, fix this with:
>> >
>> >       echo 1 > bConfigurationValue
>> >
>> >Which should get you back to the QMI/tty interfaces (option number
>6).
>> >
>> >Cheers,
>> >Davidm
>>
>>