Using an arduino with an NRF2401 connected to PC in Room A is acceptable for sure. However I if can automate commands being sent at a certain time a day from PC then I am happy. Is this doable? Perhaps and RPI 3 is more appropriate?
All is want to automatically sent commands from Linux PC to listening devices to turn on/off some lights. I know there are tons of devices that do this already. I have looked at sonOff and ESP8266 yet do not wish to have to go through the Internet and servers to simple controls some lights.