I’m sketching on a multi star topology to act as a control system for escape room/Space game. So I want every thing to be connected to one system and each node (with micro controller) should be allowed to send update once a user pres the button but also be told to change the color during setup to test all buttons. I also intend to drive power through the same flat cable but there will be possibilities to inject new power points injecting the power in a new point. Debugging and simplicity to fix problems is king.
My question is what is the best bus system for multi master. CAN, RS 485, LIN, other?
I intend to use star nodes which will repeat the signal to each star leg other than the one it received the message from to avoid to long stubs leading to all kind of funky with reflections.