Adds empty Constructor to connection

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/core/Connection.java

@@ -39,6 +39,13 @@ public interface Connection {
 	 */
 	public Link getLink();
 
+	/**
+	 * Sets the Link, which the connection uses
+	 * 
+	 * @param link the link of this connection
+	 */
+	public void setLink(Link link);
+	
 	/**
 	 * Returns the SmartDevice which started this connection
 	 * 

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/core/ConnectionPerformance.java

@@ -37,10 +37,25 @@ public class ConnectionPerformance implements Connection {
 			name = p.getName()+"-connection";
 	}
 	
+	public ConnectionPerformance() {
+		link = null;
+		this.protocol = null;
+		participants=new LinkedList<Port>();
+		removedParticipants = new LinkedList<Port>();
+		status =Connection.ACTIVE;
+		name = "unspecified-connection";
+
+	}
+	
 	@Override
 	public Link getLink() {
 		return link;
 	}
+	
+	@Override
+	public void setLink(Link link){
+		this.link = link;
+	}
 
 	@Override
 	public Port getSource() {

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/core/ConnectionPrecision.java

@@ -22,6 +22,13 @@ public class ConnectionPrecision extends ConnectionPerformance {
 		super(l,p);
 	}
 	
+	/**
+	 * Initializes the connection
+	 */
+	public ConnectionPrecision() {
+		super();
+	}
+	
 	@Override
 	public Collection<Packet> simulateTimeInterval(long startTime, long duration) {
 		/**

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/core/simpleImplementation/SimpleConnection.java

@@ -39,7 +39,7 @@ public class SimpleConnection implements Connection {
 	 * SmartDevice(Port) which started the termination process
 	 */
 	private Port srcOfTermination;
-	/* *
+	/* *is connection uses
 	 * SmartDevice which responds in the termination process
 	 */
 	// private SmartDevice other;
@@ -70,7 +70,7 @@ public class SimpleConnection implements Connection {
 	 * @param dest
 	 *            Port which is the destination of this connection
 	 * @param link
-	 *            Link which connects {@code src} and {@code dest}
+	 *            Link which connects is connection uses{@code src} and {@code dest}
 	 * @param p
 	 *            Protocol, which specifies the packet generation
 	 */
@@ -86,6 +86,11 @@ public class SimpleConnection implements Connection {
 	public Link getLink() {
 		return link;
 	}
+	
+	@Override
+	public void setLink(Link link){
+		this.link = link;
+	}
 
 	@Override
 	public Collection<Packet> simulateTimeInterval(long startTime, long duration) {