mc_repeater1

local last_message = ""
rednet.open("left")

while true do
 event, id, message = os.pullEvent();
 if event == "rednet_message" then
  if message ~= last_message then
   write("received message from "..id..": "..message.."\n")
   rednet.broadcast(message)
   last_message = message
  end
  sleep(0.2);
 end
end

rednet.close("left")