rednetTestTurtle

turnDirection = "Left"
testTurtle = function()
  rednet.open("right") --enable modem on the right side of the PC
  id,message = rednet.receive() --wait until a mesage is received
  if id == 4 then
    if message == "Turn Left" then
      turnDirection = "Left"
    elseif message == "Turn Right" then
      turnDirection = "Right"
    end
    rednet.send(4,os.GetLabel() .. " is now turning " .. turndirection)
  end
  rednet.close("right") -- disable modem on the right side of the PC
end

turn = function()
  if turnDirection == "Left" then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
end

parallel.waitForAny(testTurtle,turn)