OK guys… tell me what you want. No one on our team uses Wake-On-LAN and no one sleeps their machines. Most of our machines only reboot to take OS upgrades… laptops, servers, etc…
Help me define the product, and I’ll make it happen. Wake-on-LAN is very simple… you send a magic set of packets on the network, and if the sleeping network device sees that magic stuff while in sleep mode, it will not only wake up, but wake up the entire computer. The magic packet has a key, which is the MAC Address of the remote endpoint. I’m guessing you don’t just want a list of inputs for names and MAC Addresses with a “wake up” button next to each… so what do you want?
As for sleep, on Mac/Windows, you just want Roon to send the Core machine to sleep from the Remote? How would you like to kick off this sleep?