Enable enqueue/dequeue tracing for point-to-point links

examples/csma-multicast.cc

@@ -63,6 +63,9 @@ main (int argc, char *argv[])
 // Users may find it convenient to turn on explicit debugging
 // for selected modules; the below lines suggest how to do this
 //
+
+NS_LOG_ALL("");
+
 #if 0
   LogComponentEnable ("CsmaMulticastExample", LOG_LEVEL_INFO);
 

examples/simple-point-to-point.cc

@@ -214,8 +214,8 @@ main (int argc, char *argv[])
   // Trace output will be sent to the simple-point-to-point.tr file
   NS_LOG_INFO ("Configure Tracing.");
   AsciiTrace asciitrace ("simple-point-to-point.tr");
-  asciitrace.TraceAllQueues ();
   asciitrace.TraceAllNetDeviceRx ();
+  asciitrace.TraceAllQueues ();
 
   // Also configure some tcpdump traces; each interface will be traced
   // The output files will be named 

src/devices/point-to-point/point-to-point-net-device.cc

@@ -156,9 +156,12 @@ bool PointToPointNetDevice::SendTo (const Packet& packet, const Address& dest,
 //
 //
 // If there's a transmission in progress, we enque the packet for later
-// trnsmission; otherwise we send it now.
+// transmission; otherwise we send it now.
   if (m_txMachineState == READY) 
     {
+// We still enqueue and dequeue it to hit the tracing hooks
+      m_queue->Enqueue (p);
+      m_queue->Dequeue (p);
       return TransmitStart (p);
     }
   else