ᐅ Smart Home without switches? P.Hue, Home Assistant, Homematic wired IP

For access to the apartment, Bush Jäger offers a smart lock. In the case of Nuki, this is linked to a cloud service for management... how does Bush Jäger handle this? Is it designed to allow authorized access for third parties as well?
How do these people then gain entry?

Isn't the Busch-Jaeger system essentially a disguised KNX?
Routines like these can be created via IFTTT.
I’m sure there is ready-made software available for holiday apartments, hotels, and similar. In theory, linking devices through a voice assistant would also be sufficient in such cases.
Hue, door locks, thermostats, lighting scenes—that would be the simplest solution.
@Audiobampa
I hope this was constructive enough.
However, I want to emphasize the importance of separating the networks again. If you don’t do this, you could quickly run into legal issues with rented apartments (data protection, etc.).
I am a supporter of pragmatic solutions, but when it comes to rental properties, you shouldn’t act without caution.

A note on powerline networking (DLAN); if the apartments are supplied via (V)DSL: never use it. This will cause interference and connection drops both within the home network and, if things go badly, for the neighbors as well. They won’t be happy about that.

One option would be to use the FritzBox as a router for both networks and create a separate Wi-Fi network for each apartment. For this, I could set up two different Wi-Fi networks with unique names and passwords in the FritzBox settings. Or what do you think?

At least that would solve the problem for now.

No, the Fritzbox does not support VLANs.
You may have two Wi-Fi networks, but they will have access to each other. And no, the powerline adapter solution is not effective. It will only cause problems. A good repeater setup is even better.

You might want to move from just skimming various websites to thoroughly engaging with the technical details. Right now, there is still a lot of guesswork and very little actual knowledge circulating.

Audiobampa schrieb:

One possibility would be to use the FritzBox as the router for both networks and create a separate Wi-Fi network for each apartment. You could set up two different Wi-Fi networks with distinct names and passwords in the FritzBox settings. Right?

At least that would solve the problem...

That doesn’t solve anything because a FritzBox can’t do that. If you want to do it properly and have external access to both networks while keeping them isolated from each other, you either need a dual-WAN router in each unit or build it with a managed LAN using a capable router and VLANs.

Audiobampa schrieb:

And I think that’s quite elegant. devolo 1200 DINrail - Gigabit Internet from the distribution box | devolo

Powerline networking (DLAN) never and under no circumstances is an elegant solution. It’s at best an absolute last resort if nothing else works.

What is your technical background regarding electrical and network engineering as well as Linux and similar systems? Especially when it comes to integrating booking systems and fully automatic “powering on and off” of apartments—you are either dealing with a professional hotel environment (check companies like Sauter...) or must be prepared for serious custom programming. For features like “checking if people are in the apartment,” I would be very cautious, especially if that goes beyond just “booked or not.”