Re: What was that quote allegedly from Cardinal Richelieu again?
probably buffering a bunch and sending them together
That's exactly how it will be done or, instead of a fat (relatively) pipe cellular link, they'd be using LoRa or similar for the last half hour usage reading which, unless you're running multiple flux capacitors, should fit into a float().
When I said "real-time" I probably should have said time stamped events. After all, they don't want to be snooping on everyone immediately, just a nice virtual paper trail to look back upon should the need arise and a great big database they can broker access to. With SMETS2, the central database multiple client structure is already there, ostensibly to enable competition in the energy sector.
So, regardless of the frequency of actual uploads, the data is captured in real time. Same data, less snoopmatics talking all at once.