while true do
  -- pull a laser head for new target
  type, x_, y_, z_, id, meta, res = laser.getScanResult()
  if res ~= -1 then
    firedCount = firedCount + 1

    -- send serialized target info
    target = textutils.serialize( { x = x_, y = y_, z = z_ } )
    print("Target#" .. firedCount .. " is " .. target)

    -- init main laser with target
    modem.transmit(3, 1, target)

    -- init boost (remove comment on next line if you use boosters)
    -- modem.transmit(4, 1, "go")
  end
  sleep(0.05)
end