GDO Transmitter

print("GDO")
local component = require("component")
local event = require("event")
local modem = component.modem
local listen = function(evt,_,_,_,_,...) print(...) end
event.listen("modem_message",listen)
modem.open(420)
while true do
  local cmd=io.read()
  if not cmd then return end
  modem.broadcast(420, cmd)
  if cmd == "quit_client_mode" then break end
end
event.ignore("modem_message",listen)