Prepare the smart home for future expansion (no wireless/cloud)

Damn. Can't edit anymore. So what I know: The 4-core cable offered with green wire in 0.8mm is available in 100m length. Then run that thing everywhere I want to control and what it should control? If 2 wires come from the roller shutter, how do you tangle that? 2 wires laid for nothing?

I would first read up on the basics of KNX – and then, for self-protection reasons, find an electrician who knows their stuff and can make a preliminary plan.

I also advocate for technology openness. I wouldn’t limit myself. Who knows what the next 15/20/25 years will bring? How cool smart homes with LLM from, for example, OpenAI could become.

Sure, you can then rebuild everything, run your own Raspi, or run it in a Docker or next-generation container. Although the trend is already moving towards serverless (for example, Lambda functions).

But the self-built solution usually only works so-so and you have to take care of it.

And you are not as good and don’t have as much time as 500(0) experts from Apple/Google/MS/Amazon/Ali Baba/…

My private time is too precious for that.

MaxiFrett Also an IT person IT/Cloud Security

Evening, yes OK. Let's just mentally move towards KNX. Is laying 4-wire still the current standard? Regards

Yes, KNX with the green bus cable and 4 wires is still standard. In the house (just as you basically want it in terms of data) the data is generally rather simple (shutter up/down, light on/off/dim value - maybe several channels, etc.) The 4 wires are still more than enough for that - for internet, decent cameras, etc. you have to go with Ethernet anyway. But a sensible KNX wiring does not correspond to a typical house installation wiring -> you can run the green cable everywhere (e.g. shutter) and later install a flush-mounted actuator, BUT compared to that it is significantly more expensive than running every shutter to the distribution board and having a large multi-channel actuator in there. So I would also recommend that you read up on KNX rudimentarily and have it planned by a suitable electrician, if your schedule still allows for it in any way. By the way, I do not see any brake in KNX for the use of AI in the distant or near future! If none of that is an option, I think the Shelly principle is really not a stupid idea (but I am definitely also an advocate of cables).

Evening,
yes OK. Let's just mentally move towards KNX. Is it still the current standard to lay 4 wires?
Regards

First, urgently take a look at WHERE you need to lay the KNX cable. Before you think any further about it, please make sure you somewhat understand what it actually is. You mention Home Assistant as a "smart home system"... HA is nothing more than good visualization; it does not switch, dim, or move anything by itself. There always has to be another system installed underneath. With KNX, you can later put HA on top, so it looks nice.

So: First do your homework and get a feel for what actuators, sensors, and everything in between are. Explaining this from scratch here is going to be impossible.