drone = component.proxy(component.list("drone")())
modem = component.proxy(component.list("modem")())
leash = component.proxy(component.list("leash")())

modem.open(27)

route = {}
path = {}
current = ""

while true do
  name, _, sender, _, _, message, x, y, z, point, from = computer.pullSignal(1)
  if name == "modem_message" then
    if message == 'add' then
      add(tonumber(x), tonumber(y), tonumber(z), point, from)
      if current == "" then current = point end
    elseif message == 'to' then
      to(x)
    elseif message == 'catch' then
      catch()
    elseif message == 'drop' then
      drop()
    end
  end
  if #path > 0 and drone.getOffset() < 1 then
    drone.move(route[path[#path]].x-route[current].x, 
               route[path[#path]].y-route[current].y, 
               route[path[#path]].z-route[current].z)
    current = path[#path]
    path[#path] = nil
  end
end

modem.close()