Our hardware base will be a Raspberry Pi.
It should an actual modell like Raspberry Pi 4 or Raspberry Pi 5.
The more, the better: RAM should be at leas 4 GB!
For future use, I suggest to use a Raspberry Pi with 16 GB RAM and a PCIe NVMe!
For getting independent of brands, we will install a ZigBee and a Z-Wave USB stick. Details later.