Make ServiceServerResponse serializable

Author: neocoretechs

src/main/java/org/ros/internal/node/service/ServiceServerResponse.java

@@ -1,15 +1,25 @@
 package org.ros.internal.node.service;
 
+import java.io.Serializable;
 import java.nio.ByteBuffer;
 
 /**
+ * Response object returned from the service server upon completion of the service via client invocation.
+ * The instance is sent as a byte payload which contains a bytebuffer with integer headers indicating
+ * message size and error status presumably in support of UDP transport layer at some point.<p/>
+ * These headers are extracted using a decoder, and then the payload that represents an instance of this object is
+ * contained in the remainder of the byte payload and deserialized. The instance is sent on the event handling
+ * internal bus, then multiplexed onto the TCP bus back to the client.
+ * @author Jonathan Neville Groff (C) NeoCoreTechs 2020
 */
-class ServiceServerResponse {
-  
+class ServiceServerResponse implements Serializable {
+  private static final long serialVersionUID = -5429450419100506243L;
   private ByteBuffer message;
   private int errorCode;
   private int messageLength;
 
+  public ServiceServerResponse() {}
+  
   public void setErrorCode(int errorCode) {
     this.errorCode = errorCode;
   }