RaspberryPi 2 with Huawei E398

[Aleksander Morgado]

On Fri, May 15, 2015 at 10:28 AM, John Whitmore <arigead at gmail.com> wrote:
> I'm trying to put together a system which uses 2 Huawei E398 USB Dongles with
> two different operator SIM's so that if one modem has no coverage the other
> takes over.
>
> I've followed the debugging information on [1] to try and get my hands on the
> logs but not sure where the NetworkManger is sending its logging info. I do
> have the output from ModemManager, which I'll attach to this email.
>
> I'm not sure that the logging from ModemManager will be of any help at all as
> it might not be the issue. What is happening is that I can establish a
> connection but as soon as I start to do a ping test from the command line the
> whole system freezes.
>
> This is with one 4G Dongle in place, I was hoping to be able to manage both
> connections.
>
> I'm using raspbian 2015-05-05 with kernel 3.18.13
>
> If I can send on anything else please let me know. I'd really like to get this
> system working. Unfortunately I've only got two E398 Dongles so I can't try
> with a different modem at present. I'll try and get my hands on another.
>
>
> [1] : http://www.freedesktop.org/wiki/Software/ModemManager/Debugging/


Ouch; ModemManager 0.5.2 is way too old... Could you setup
ModemManager 1.4.8 with libqmi to try?

Also, just to make sure, you are using an external *powered* usb hub
to connect the modems to the RPi, right? The RPi cannot handle the
power consumption of 1 single modem in connected state.

-- 
Aleksander
https://aleksander.es