Telit HE910 : how to get the network interface name

Telit HE910 : how to get the network interface name

[Etienne Mabille]

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Hi everyone,

I am using ofono and the Telit HE910, configured and running fine.
I am now working on a program thats monitors the connection and initiates
the reconnection when it is lost.

This program uses the network interface name : usually ppp0.
I am looking for a clean way of getting this name for the telit, and not
just hard-code it in case this name changes.

I see that in several modems (hs0 and samsung at least), this is done in
the setup_* function in udevng.c
For these modems, the NetworkInterface field is retrieved from the device.
However, in the telit documentation, it specifies that out of the seven
devices created for the modem (/dev/ttyACM0-6)
only 2 can be used : the data port for ppp connections and the generic port
for AT commands.

Is there another way of retrieving this information ?

I saw that it appears in gatchat/ppp_net.c: in the function ppp_net_new
where it submits the name "ppp%d".
My understanding is that the kernel (or pppd) fills out the number with the
first one available.
But this is general code in which we don't have access to the modem
anyway...

Thanks for your help
Best regards.

Etienne

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Re: Telit HE910 : how to get the network interface name

[Denis Kenzior]

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Hi Etienne,

On 05/21/2013 05:05 AM, Etienne Mabille wrote:
> Hi everyone,
>
> I am using ofono and the Telit HE910, configured and running fine.
> I am now working on a program thats monitors the connection and
> initiates the reconnection when it is lost.
>
> This program uses the network interface name : usually ppp0.
> I am looking for a clean way of getting this name for the telit, and not
> just hard-code it in case this name changes.
>

The interface name is given by oFono when the context is activated.  See 
the 'Interface' entry in the 'Settings' dictionary of the 
ConnectionContext interface (doc/connman-api.txt)

If the context is deactivated / lost, then the interface is either 
destroyed or ifdown-ed by oFono.

> I see that in several modems (hs0 and samsung at least), this is done in
> the setup_* function in udevng.c
> For these modems, the NetworkInterface field is retrieved from the device.
> However, in the telit documentation, it specifies that out of the seven
> devices created for the modem (/dev/ttyACM0-6)
> only 2 can be used : the data port for ppp connections and the generic
> port for AT commands.
>
> Is there another way of retrieving this information ?
>
> I saw that it appears in gatchat/ppp_net.c: in the function ppp_net_new
> where it submits the name "ppp%d".
> My understanding is that the kernel (or pppd) fills out the number with
> the first one available.
> But this is general code in which we don't have access to the modem
> anyway...
>

Those are implementation details and are subject to change.

> Thanks for your help
> Best regards.
>
> Etienne

Regards,
-Denis