rednetGet

slaveName = "5"
masterID = 0
outputBool = false

function testMaster(pID = -1, pMessage)
  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
    rednet.send(pID, slaveName)
    masterID = pID
    print("Discovered Master with ID: " .. pID)
    return true
  end
end


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