pocketmine\network\Network::addStatistics PHP Method

    public function addStatistics($upload, $download)
    {
        $this->upload += $upload;
        $this->download += $download;
    }

 public function handleOption($name, $value)
 {
     if ($name === "bandwidth") {
         $v = \unserialize($value);
         $this->network->addStatistics($v["up"], $v["down"]);
     }
 }