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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.
envoyé : 20 octobre 2022 à 18:41
de : Peter Naulls <pe...@chocky.org>
à : Aleksander Morgado <aleksande...@chromium.org>
Cc: "ModemManager (development)" <modemmanager-devel@lists.freedesktop.org>
objet : Re: Confirming APN in use
On 10/20/22 05:06, Aleksander Morgado wrote: Hey Peter,
In 4G there are 2 different sets of APNs required for a successful
data connection: first, the initial EPS bearer settings (a.k.a. attach
APN), which is used during modem registration phase; and second the
data connection settings (a.k.a data APN), which is used during modem
connection phase. These settings may be equal or different, it really
depends on the operator. Some operators may require an attach APN that
is by default not providing Internet access, and so a different data
APN needs to be used if the user wants to get to the Internet. Some
operators allow requesting no specific attach APN (i.e. using blank ""
APN), so that the network decides which one is used.
Thanks, that was very helpful. We have decided that for our use
cases, setting the initial bearer as well is going to be the best solution.
I can set this in my monitoring script, which should be OK - check
the APN when the modem becomes available, but I don't know if there's
a better place in the MM/netifd/OpenWrt scripts where this would be
better and more reliably done? Changing the APN might well cause
the modem to reset, which is fine, but it's worth bearing in mind.
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