I'll bite, what sort of remote control can you do that isn't, some how, some way, using the Internet? You gonna lease RF spectrum and set up some kind of radio controls?
Well, dedicated/proprietary lines are a thing. I don't know about the cost:benefit ratio of deploying them for this in France would be, but it doesn't have to be RF like there's no other option. You can use regular wired network connections without routing through publicly addressable connections. That's a thing ATMs still sometimes do, at least in the US; it used to be ubiquitous but as encryption software has gotten better they've reportedly been relaxing this requirement, but banks still use dedicated lines for this. I used to work at a large investment bank that even used dedicated lines for international conference calls. AIUI, home DSL lines even typically (always?) start with a short run over a proprietary ATM backhaul.