I have a ongoing VPN project where I have installed OpenVPN on my Raspberry Pi. Everything works fine but the VPN is meant for just myself and so the Raspberry Pi is unused for a long time every day.
So to prevent this power-waste I need to make my Raspberry Pi sleep when it isn't being used and to wake up when a VPN connection is requested (LAN signal).
I have found some articles saying that the RPI use no power at all and I should just leave it on BUT because I'm a enthusiastic RPI user this have turned to be a challenge in which I need the community to help me to finish it.