--- a/src/applications/onoff/onoff-application.cc	Tue Dec 11 13:51:03 2007 +0100
+++ b/src/applications/onoff/onoff-application.cc	Tue Dec 11 13:51:18 2007 +0100
@@ -33,6 +33,7 @@
 #include "ns3/socket-factory.h"
 #include "ns3/default-value.h"
 #include "ns3/packet.h"
+#include "ns3/composite-trace-resolver.h"
 #include "onoff-application.h"
 
 NS_LOG_COMPONENT_DEFINE ("OnOffApplication");
@@ -241,6 +242,7 @@
 
   NS_ASSERT (m_sendEvent.IsExpired ());
   Ptr<Packet> packet = Create<Packet> (m_pktSize);
+  m_txTrace (packet);
   m_socket->Send (packet);
   m_totBytes += m_pktSize;
   m_lastStartTime = Simulator::Now();
@@ -262,4 +264,17 @@
   cout << "OnOffApplication, Connection Failed" << endl;
 }
 
+Ptr<TraceResolver> 
+OnOffApplication::GetTraceResolver (void) const
+{
+  Ptr<CompositeTraceResolver> resolver = Create<CompositeTraceResolver> ();
+  resolver->AddSource ("tx",
+                       TraceDoc ("A new packet is created is sent",
+                                 "Ptr<const Packet>",
+                                 "The newly-created packet."),
+                       m_txTrace);
+  resolver->SetParentResolver (Application::GetTraceResolver ());
+  return resolver;
+}
+
 } // Namespace ns3

--- a/src/applications/onoff/onoff-application.h	Tue Dec 11 13:51:03 2007 +0100
+++ b/src/applications/onoff/onoff-application.h	Tue Dec 11 13:51:18 2007 +0100
@@ -29,6 +29,7 @@
 #include "ns3/event-id.h"
 #include "ns3/ptr.h"
 #include "ns3/data-rate.h"
+#include "ns3/callback-trace-source.h"
 
 namespace ns3 {
 
@@ -135,8 +136,10 @@
   EventId         m_sendEvent;    // Eventid of pending "send packet" event
   bool            m_sending;      // True if currently in sending state
   std::string     m_iid;
+  CallbackTraceSource<Ptr<const Packet> > m_txTrace;
   
 private:
+  virtual Ptr<TraceResolver> GetTraceResolver (void) const;
   void ScheduleNextTx();
   void ScheduleStartEvent();
   void ScheduleStopEvent();