Adds ping packet loss, stops ping target from sending requests

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/core/protocols/Ping_protocol.java

@@ -31,7 +31,10 @@ public class Ping_protocol implements Protocol {
 		sender = null;
 		target = null;
 	}
-	short sequence = 0;
+	/**
+	 * Ping sequence number
+	 */
+	private short sequence = 0;
 	@Override
 	public Collection<Packet> generateNextPackets(Port port, long timestep, boolean packetLost) {
 		/**
@@ -47,15 +50,14 @@ public class Ping_protocol implements Protocol {
 		
 		if(port == sender && target != null){
 			packets.add(new Ping_packet(timestep, sender, target, Ping_packet.EchoRequest, sequence));
-			if(target.getStatus() >= Port.OPEN){
-				packets.add(new Ping_packet(timestep+target.getResponseTime()+(short)(target.getJitter()*Math.random()), target, sender, Ping_packet.EchoReply, sequence));
+			if(target.getStatus() >= Port.OPEN && !packetLost){
+				packets.add(new Ping_packet(timestep+target.getResponseTime()+(short)(target.getJitter()*Math.random()), target, sender, Ping_packet.EchoReply, sequence++));
 			}
 		}
-		else if(port == target && sender != null){
-			packets.add(new Ping_packet(timestep, target, sender, Ping_packet.EchoRequest, sequence));
-			if(sender.getStatus() >= Port.OPEN){
-				packets.add(new Ping_packet(timestep+sender.getResponseTime()+(short)(sender.getJitter()*Math.random()), sender, target, Ping_packet.EchoReply, sequence));
-			}
+		else if(port == target){
+			/**
+			 * Target should not initialize ping
+			 */
 		}
 		return packets;
 	}