Open some Devices to a second Home Assistant

Hi,

My sun wants to start to play around with Home Assistant.

I have a full blown installation where I do not want to give him access. So I have now done the following:

  1. Installed Raspbian Home Assistant on an RPi
  2. Created a new VLAN (and WLAN) where I have put this RPi, my sons Notebook, mobile device, his yamaha Music Cast Device and one Shelly Plug S

Now he has a basic set where he can start to play

But I want to allow him also to control the one or the other device from my Home Assistant Setup.

Is there an option available to open some Devices/Automations to the second Home Assistant, but not exposing everything?

Best Regards,
Johannes

What type of devices?
Ethernet device may be directly connected

Another option is simple set them up using HA API
Publish state over MQTT.
Event stream. Uses MQTT
Statestream. Uses mqtt

e.g.:

I have multiple Shelly Plugs configured on my Master Home Assistant.
Now I want to expose one of this Plugs also to the Slave Home Assistant.

You could maybe use a Matter network, where both Has are connected, and then expose the devices you want with a Matter hub.

You can maybe also make it with Remote Home Assistant.

If they run ESPHome it is possible.