MC - CC wait for Redstone Signal

rednet.open("right")
term.clear()
term.setCursorPos(1, 1)
print("Waiting ...")
while true do
    event, id, text = os.pullEvent()
    if event == "rednet_message" then
        print(id .. "> " .. text)
        if text == "red_on" then
            redstone.setOutput("left", true)
            sleep(0.1)
            redstone.setOutput("bottom", true)
        end
        if text == "red_off" then
            redstone.setOutput("left", false)
            sleep(0.1)
            redstone.setOutput("bottom", false)
        end
    end
end