local modemWireless = peripheral.wrap("front")
local modemWired = peripheral.wrap("back")

modemWireless.open(rednet.CHANNEL_BROADCAST)
modemWired.open(rednet.CHANNEL_BROADCAST)

while true do
  local ev,side,chan,replyChan,msg,dist = os.pullEvent("modem_message")
  local otherModem = modemWired
  if side == "right" then otherModem = modemWireless end
  otherModem.transmit(chan,replyChan,msg)
end