[Networkmanager] Multiple connections for the same device

[Fabio Porcedda]

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
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