AFKController.lua

rednet.open("top")

while true do
    local sender, msg, pts = rednet.receive()
    if msg == "afk_on" then
        print("afk_on")
        redstone.setBundledOutput("left", 0)
        sleep(0.5)
        redstone.setBundledOutput("left", colors.blue)
    end
    if msg == "afk_off" then
        print("afk_off")
        redstone.setBundledOutput("left", 0)
        sleep(0.5)
        redstone.setBundledOutput("left", colors.white)
    end
end