Author: Vasily Zorin (maintainer@daemon.io)
Inheritance: extends PHPDaemon\Network\Client
 /**
  * Constructor.
  * @return void
  */
 public function init()
 {
     $req = $this;
     $job = $this->job = new \PHPDaemon\Core\ComplexJob(function () use($req) {
         // called when job is done
         $req->wakeup();
         // wake up the request immediately
     });
     $job('pingjob', function ($name, $job) use($req) {
         // registering job named 'pingjob'
         \PHPDaemon\Clients\ICMP\Pool::getInstance()->sendPing('8.8.8.8', function ($latency) use($name, $job) {
             $job->setResult($name, $latency);
         });
     });
     $job();
     // let the fun begin
     $this->sleep(5, true);
     // setting timeout
 }