turtleSpawn

--the ID of the control computer
local controller = 29

function spawn()
  turtle.select(slot)
  turtle.drop()
end

function retrieve()
  turtle.select(slot)
  turtle.suck()
end


--code

rednet.open("right")

while true do
  id,z = rednet.receive()

  if id == controller and z < 17 then
    slot = z
    spawn()
  elseif id == controller and z == 17 then
    retrieve()
  end
end