[Networkmanager] Multiple connections for the same device

[Greg Oliver]

On Tue, Jul 11, 2023 at 1:19 AM Fabio Porcedda <fabio.porcedda at gmail.com>
wrote:

>
>
> Il giorno mar 11 lug 2023 alle ore 00:49 Greg Oliver <
> oliver.greg at gmail.com> ha scritto:
>
>> On Mon, Jul 10, 2023 at 6:51 AM Fabio Porcedda <fabio.porcedda at gmail.com>
>> wrote:
>>
>>>
>>>
>>> Il giorno sab 8 lug 2023 alle ore 10:59 Frédéric Martinsons <
>>> frederic.martinsons at gmail.com> ha scritto:
>>>
>>>> s/limbmm/libmm
>>>>
>>>> Le sam. 8 juil. 2023, 10:58, Frédéric Martinsons <
>>>> frederic.martinsons at gmail.com> a écrit :
>>>>
>>>>> Hello,
>>>>>
>>>>> I have a similar use case, to have multiple GSM configuration for a
>>>>> device, I disabled autoconnect on Networkmanager and I have a dedicated
>>>>> service (which is built around libnm et limbmm) to be able to
>>>>> actovate/deactivate/monitor these multiple connection.
>>>>>
>>>>> I don't think it is possible in NM to have multiple active connection
>>>>> on the same device.
>>>>>
>>>>
>>> I think the same, so in order to have it I would like to change the
>>> source code, I appreciate any suggestion about the parts to change.
>>> I'm searching for the code where the old connection is disconnected when
>>> a new one is made for the same device.
>>>
>>>
>>>
>>>> Le sam. 8 juil. 2023, 10:31, Fabio Porcedda <fabio.porcedda at gmail.com>
>>>>> a écrit :
>>>>>
>>>>>>
>>>>>> Il giorno ven 7 lug 2023 alle ore 16:19 Andrei Borzenkov <
>>>>>> arvidjaar at gmail.com> ha scritto:
>>>>>>
>>>>>>> On Fri, Jul 7, 2023 at 5:10 PM Fabio Porcedda <
>>>>>>> fabio.porcedda at gmail.com> wrote:
>>>>>>> >
>>>>>>> > Hi all,
>>>>>>> > I would like to implement multiple connections for the same
>>>>>>> device, My idea is to avoid disconnecting a connection even if a new
>>>>>>> connection is requested for the same device. Does anyone have some
>>>>>>> suggestions about the file or function to change?
>>>>>>> >
>>>>>>>
>>>>>>> I am not sure I understand what device you mean. Do you mean ethernet
>>>>>>> interface? Do you want to apply multiple connection profiles to the
>>>>>>> same ethernet interface concurrently?
>>>>>>>
>>>>>>
>>>>>> I mean gsm type device. I would like to activate multiple connection
>>>>>> profiles for the same gsm device at the same time.
>>>>>> Sometimes it is useful to have multiple active apn for the same
>>>>>> broadband device enabled at the same time because each apn can have
>>>>>> different capabilities.
>>>>>>
>>>>>
>> Good luck - the "modems" do not have the capability to connect to more
>> than a single APN simultaneously with a multi-APN device (shich I know of
>> none).
>>
>
> Modems do have this kind of capability, for example It's possible using
> ModemManager with a modem that support MBIM or QMI, e.g.:
>
> mmcli -m <modem_id> --create-bearer="apn=<apn1>,multiplex=required"
> mmcli -m <modem_id> --create-bearer="apn=<apn2>,multiplex=required"
>
> mmcli -m <modem_id> -b <bearer1_id> --connect
> mmcli -m <modem_id> -b <bearer1_id>
> ip addr add <bearer1_adddres>/<bearer1_prefix> dev <bearer1_interface>
> ip link set <bearer1_interface> up
> ip route add <bearer1_network>/<prefix> dev <bearer1_interface>
>
> mmcli -m <modem_id> -b <bearer2_id> --connect
> mmcli -m <modem_id> -b <bearer2_id>
> ip addr add <bearer2_adddres>/<prefix> dev <bearer2_interface>
> ip link set <bearer2_interface> up
> ip route add <bearer2_network>/<prefix> dev <bearer2_interface>
>
> Regards
> --
> Fabio Porcedda
>

And after your <bearer2> commands, the <bearer1> stuff will be gone...  I
imagine this is the problem you are encountering.
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