FFcontrol

for k,v in pairs(rs.getSides()) do
  if peripheral.getType(v) == "modem" then
   rednet.open(v)
  end
end


if fs.exists("redState") then
  file = fs.open("redState", "r")
  redState = file.readAll()
  file.close()
  setRS = redState == "true"
  rs.setOutput("bottom", setRS)
else
  redstate = false
end
while true do
  ID, message = rednet.receive(33)
  if message == "BuildWither" then
    rs.setOutput("bottom", false)
    redState = false
  elseif message == "WitherBuilt" then
    rs.setOutput("bottom", true)
    redState = true
  end
  file = fs.open("redState", "w")
  file.write(redState)
  file.close()
end