msg.putHeader("belaban", new NakAckHeader((byte)1, 23, 34));
size=Util.sizeOf(msg);
System.out.println("size=" + msg.size() + ", streamable size=" + size);
msg.putHeader("bla", new UdpHeader("groupname"));
size=Util.sizeOf(msg);
System.out.println("size=" + msg.size() + ", streamable size=" + size);
IpAddress a1=new IpAddress(1234), a2=new IpAddress("127.0.0.1", 3333);