BitNet Repeater 1.15

local modem = {peripheral.find("modem")}
for i = 1, #modem do modem[i].open(rednet.CHANNEL_REPEAT) end

local tower = {peripheral.find("bitnet_tower", function(name, object) return object.isTowerComplete() end)}

local repeated, msgID, timerID, myEvent = 0, {}, {}

local function RedstoneSetSignal(signal)

    if signal == "on" then
        --for k,v in pairs(redstone.getSides()) do
            --redstone.setOutput(v, true)
        --end

        --print"Waiting for audio disk..."
        --if then
        --  if disk.hasAudio(side)
        --      print("Disk Drive doesn't has the audio disk.\nPlease put in the '13' Song disk.")
        --  else
        --      disk.playAudio(side)
        --   end
        --end

        if peripheral.isPresent("top") then

            if disk.hasAudio("top") then

                disk.playAudio("top")

            else

                print("Disk Drive doesn't has the audio disk.\nPlease put in the '13' Song disk.")
                os.reboot()

            end

        else

          error("No disk drive found on Top.\nPlease Place the disk drive on the top of the computer.")
          os.reboot()

        end

    elseif signal == "off" then

        if peripheral.isPresent("top") then

            disk.stopAudio("top")

        else

          error("No disk drive found on Top.\nPlease Place the disk drive on the top of the computer.")

        end

    end

end

while #tower == 1 do

    myEvent = {os.pullEvent()}

    -- Message arriving via tower:
    if myEvent[1] == "bitnet_message" then
        print("Message: "..myEvent[3])
        RedstoneSetSignal(myEvent[3])
    end

end