Processing sketch on how to synchronously ping devices

ProcessingPing

import java.net.*;

void setup() {}

void draw() {
  if(frameCount % 100 == 0) {
    try { 
      println("Is online " + InetAddress.getByName("192.168.0.128").isReachable(1000));
    } catch(Exception e) {
      println(e.toString());
    }
  }
}