Multiple Modems (USB Dongle) problem

[Dan Williams]

On Wed, 2015-10-21 at 17:56 +0200, poma wrote:
> On 21.10.2015 17:12, Dan Williams wrote:
> > On Mon, 2015-10-19 at 09:40 +0200, Aleksander Morgado wrote:
> >> Hey John,
> >>
> >> On Sat, Oct 17, 2015 at 3:16 PM, John Whitmore <arigead at gmail.com> wrote:
> >>> This is a development list so possibly the wrong place for this question but
> >>> please redirect me as necessary.
> >>>
> >>
> >> No, this is the correct place to ask :)
> >>
> >>> I've got a problem using two USB LTE Dongle modems of exactly the same
> >>> model. They each have a different operators SIM installed. They will both get
> >>> added to the linux system (I'm using Arch on a RPi-2) as /dev/cdc-wdm0 and
> >>> /dev/cdc-wdm1. BUt they will be added, I imagine, at random.
> >>>
> >>> Managing which is which is the job of UDEV rules so I've added the necessary
> >>> rules to create symbolic links to the two modems as /dev/three and
> >>> /dev/vodafone.
> >>>
> >>> That all works great my problem is that in the network manager when I add a
> >>> connection it only offers me the devices /dev/cdc-wdm0 and /dev/cdc-wdm1. NOT
> >>> my new symbolic links.
> >>>
> >>
> >> Have you tried to rename the interfaces, as systemd does with the WWAN
> >> net interfaces and the "predictable network interface names" setup?
> >> You should need to do that before the MM udev rules are used.
> >>
> >>> So given that it's the NetworkManager agian this might be considered the wrong
> >>> list.
> >>>
> >>> Maybe I should explain the system here. This is going into an RPi-2 in a boat
> >>> that floats about a lake. So mobile coverage will change between the two
> >>> operators. I'm taking this one step at a time and ultimately I'd like the
> >>> system to use which ever connection it can. That might be a problem as the
> >>> boat needs to have a web site open on the browser. That web page is used to
> >>> upload data so the web page is opened and the boat floats about the lake
> >>> populating forms in the web page. If the web page is connected via one
> >>> connection and the connection changes that might cause a problem. I've not got
> >>> there yet. Like I say one step at a time.
> >>>
> >>> This might not even be a problem. I mean maybe the NetworkManager creates a
> >>> connection, but then the ModemManager has the intelligence to say that you're
> >>> trying to open the "vodafone" connection on the wrong modem and just take care
> >>> of it?
> >>
> >> So, the thing here is that NetworkManager should allow binding a given
> >> set of mobile broadband settings to a given specific device (based on
> >> 'Equipment ID') or SIM (based on ICCID or even MCCMNC); e..g as it can
> >> be done with binding settings to a network interface based on the MAC.
> >> If that is done, NM would be intelligent enough to enable the correct
> >> settings in each modem.
> >>
> >> Dan, what's the status of this in NetworkManager? Was any change done recently?
> > 
> > Um, I wrote it on a plane last week and this week, but not upstream yet:
> > 
> > http://cgit.freedesktop.org/NetworkManager/NetworkManager/log/?h=dcbw/wwan-connection-filters
> > 
> > Dan
> > 
> 
> I guess if you wrote it on a plane, you already upstream it.
> You have at least used a permanent marker?

Dry-erase; gotta be able to change it after it gets reviewed :)

Dan