Remote Door Server

local modem = peripheral.wrap("back")
local password = "123"
local channel = 20
--------------------
modem.open(channel)
while true do
 local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")
  if message == password then
   modem.transmit(channel, channel, "accepted")
   print("password accepted")
  else
    modem.transmit(channel, channel, "denied")
    print ("password denied (" ..message.. ")")
  end
 sleep(0.1)
end