Confirming APN in use

Aleksander Morgado aleksandermj at
Fri Oct 21 07:59:24 UTC 2022

Hey Julien,

On Thu, Oct 20, 2022 at 7:45 PM Julien <gouessej at> wrote:
> Is it the case when trying to send a MMS? My mobile operator uses 2 distinct APNs for the Internet and MMS, I can receive MMS when switching to the APN for MMS but it seems to be trickier to send MMS.

That is a whole different story. If you have a specific APN needed for
MMS, then you can either:
 * disconnect the internet APN, connect the MMS APN, send the MMS,
disconnect the MMS APN and reconnect the internet APN. This is what
you would do if you don't know how to support multiplexing or if your
modem doesn't support it.
 * try to use multi-PDN/APN connections (i.e. multiplex=requested in
the Simple.Connect() arguments) so that you have two separate data
paths (and you would need to configure routing properly for each, e.g.
use the internet APN data path as default route and the MMS data path
with an explicit route to the network MMSC. This is what phones
usually do.

This is unrelated to the need of an initial/attach default EPS bearer.


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