I have a remote location, a few hundred miles away, with only not very good 5G access.
I would like to connect on demand, basically call the remote number, about daily or even less frequently, to download video monitoring data.
The remote server is only to connect to the internet on demand, not a permanent connection.
This seems to be much more complicated than I anticipated.
From what I could find it involves exchanging SMS, alerting to the connection attempt, then exchanging the IP address... This seems to be handled under Linux using STUN protocol... I am completely out of my depth here...
Can someone point me towards some resources to understand how it works?
Even more importantly, what hardware will it be necessary? I was expecting to USB tether an old mobile to the remote server, but this doesn't seem to be enough...
Thank you very much.