The first subsystem I'm working on is the light control.

It is possible to have two cases:
1) more than one control per light point
2) a single control for light point

The first case is the simplest, it is sufficient to connect the node in series to the switches [1].

The second case is slightly more tricky, it is necessary to replace the single switch with a 2-way switch and put it in series with the node [2a], or with a push-button connected directly to the node [2b].

The "SWITCH NODE" must have three functions:
- switch ON/OFF the load
- sense if the load is ON or OFF
- communicate to receive commands and send the status of the load