broadcast

rednet.open("top")
print("ENTER MESSAGE")

local function receive ()

    sleep(0.5)
    local a = read()
    print("END WITH CTRL+T")
  while true do
      sleep(1)
      rednet.broadcast(a)
  end


end

local function send ()
  sleep(5)
  rednet.broadcast("TRANSMISSION END")
end

parallel.waitForAll(receive ,send)