What control of white goods via smart meters from OSD? (Communication channels: external, wifi, BT,

There is information that from smart meters installed progressively by DSOs, it will be possible to control home appliances. E.g. here and the same Link: "Importantly, remote meters will be able to become part of a home's appliance network, thus allowing the whole process to be automated - and will, for example, switch on appliances when energy is cheapest."

What channels does/can this take place through? How is this already currently implemented? I couldn't find information anywhere...
Applicationally (with settings via smartphone), i.e. via an external network?
Possibility to pair with home wifi? The meter's own wifi? Bluetooth? (but meters are sometimes located in remote parts of the building, question of range...). Is it remote via OSD (and the home device "assigns itself" remotely at OSD to our meter etc.) via some API? Otherwise?

Can IoT devices (e.g. air conditioner, that's what I'm most interested in) also get information about the current instantaneous energy price etc. in this way? The current household consumption?

There are already some of these meters in the country (approx. 20%).

(By the way, it is always worth bearing in mind the risks, such as the following. KIGEiT warns, counters b. important for cyber security)