startup

slaveName = "5"
masterID = 0
outputBool = false

function testMessage()
  id, message = rednet.receive()
  if id == masterID then
    if message == "t" then
      outputBool = not outputBool
      setRedstone(outputBool)
    end
  end
end

function setRedstone(state)
  print("Setting Redstone to: " .. tostring(state))
  redstone.setOutput("back", state)
end

setRedstone(outputBool)

rednet.open("top")

while true do
  id, message = rednet.receive()
  if message == "KKRNBTNMaster" then
    rednet.send(id, slaveName)
    masterID = id
    print("Discovered Master with ID: " .. id)
    break
  end
end

while true do
  testMessage()
end