Hi Csaba, a museum setup sounds interesting.
Is it an artwork by any chance? That's where my roots in all this lie.
As regards your welcome SMS, I implemented it using SMPP
alert_notifications. I have not used it for a long time though, and I
can't find my patch to smpp_msc.c to differentiate Attach and Periodic
LUR. In fact, I think I remember this being a patch to openbsc anyway.
So - this would send an SMS on every initial attach AND LUR. If you want
to maintain some state about which MS already received the SMS, you'd
have to implement that, then it would not matter that you don't patch
osmo-msc.
It might not be so difficult.
Something like:
https://gitlab.tic-ac.org/rhizomatica/rccn/-/blob/master/rccn/smpp.py#L48
k/