Receive text messages without polling?

[Martin]

Hi,

since long I use a simple Python script that fetches text
messages via org.freedesktop.ModemManager.Modem.Gsm.SMS.List().
However, polling is boring. Is there a way to get SMS
asynchronously, e.g. by D-Bus callback?

TIA!

Btw. I also wonder wether there is a way to make 120 % sure,
that my modem is *not* used for mobile data? I want text message
mode only, because any MB of data is charged with one pound of
my flesh. I just not configure mobile in NM, right?

TIA, again!