code: @Override
  	protected void serializeTo(RawDataBuffer out)
      {
      	super.serializeTo(out);
      	if (deliveredMessageIDs != null)
          {
      		int len = deliveredMessageIDs.size(); 
              out.writeInt(len);
              for (int i = 0; i < len; i++)
              	out.writeUTF(deliveredMessageIDs.get(i));
          }
          else
              out.writeInt(0);
      }
docs: /* (non-Javadoc)
  @see net.timewalker.ffmq4.network.packet.AbstractPacket#serializeTo(net.timewalker.ffmq4.utils.RawDataOutputStream)