Switch/LAN Router

local function createFile(name,content)
  if fs.exists(name) then
    return "file exists"
  else
    local file = fs.open(name, "w")
	file.write(content)
	file.flush()
  end
  print("Created file "..name)
end

local function listenSwitch()
  -- Listen to switch
  switch.open(channel)
  while true do
    local event, modemSide, senderID, channel, message = os.pullEvent("modem_message")
	if modemSide == switchSide then
      modem.transmit(channel, channel, message)
	  print(textutils.serialize(message))
	end
  end
end

local function listenModem()
  -- Listen to modem
  modem.open(channel)
  while true do
    local event, modemSide, senderID, channel, message = os.pullEvent("modem_message")
	if modemSide == wiredSide then
      switch.transmit(channel, channel, message)
	  print(textutils.serialize(message))
	end
  end
end

switchSide = "left"
wiredSide = "right"
switch = peripheral.wrap(switchSide)
modem = peripheral.wrap(wiredSide)
channel = 65535

parallel.waitForAny(listenModem, listenSwitch)