Created attachment 2949 [details]
Add trace sources with addresses

The attached patch (due to Fernando Cintron) proposes to add some new trace sources to several of our traffic generator apps:  PacketSink, UdpEchoClient/Server, OnOffApplication, and UdpServer.

Currently, the traces usually just export a Ptr<Packet>.  The proposal is to add a second trace in parallel to report also the source and destination addresses associated with the packet; e.g.

       m_rxTrace (packet);
+      m_rxTraceWithAddresses (packet, from, localAddress);
 
The signature is:

+   /**
+    * TracedCallback signature for packet and source/destination addresses.
+    *
+    * \param [in] packet The packet.
+    * \param [in] srcAddress The source address.
+    * \param [in] destAddress The destination address.
+    */
+  typedef void (* TwoAddressTracedCallback)
+    (const Ptr<const Packet> packet, const Address &srcAddress, const Address &destAddress);