rednetGet

slaveName = "5"
masterID = 0
outputBool = false
masterActive = false

function testMaster(pID, pMessage)
  pID = pID or -1
  if pID == -1 then
    while true do
      id, message = rednet.receive()
      if message == "KKRNBTNMaster" then
        rednet.send(id, slaveName)
        masterID = id
        print("Discovered Master with ID: " .. id)
        return true
      end
    end
  else
    if message == "KKRNBTNMaster" then
      rednet.send(pID, slaveName)
      masterID = pID
      print("Discovered Master with ID: " .. pID)
      return true
    end
  end
end


function testMessage()
  id, message = rednet.receive()
  if message == "t" then
    if id == masterID then
      outputBool = not outputBool
      setRedstone(outputBool)
    end
  else
    if message ~= lastmessage then
      masterActive = false
    end
    if testMaster(id, message) and not masterActive then
      masterActive = true
      lastmessage = message
    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
  testMessage()
end