added end() method, stop'ping the UDP sockets

anticipating an update in the underlying MIDI library to call the end() method

Author: lathoub

src/AppleMIDI.h

@@ -55,6 +55,11 @@ class AppleMIDISession
 #endif
 	};
 
+    virtual ~AppleMIDISession() 
+    {
+
+    };
+
 	void setHandleConnected         (void (*fptr)(const ssrc_t&, const char*))                           { _connectedCallback = fptr; }
 	void setHandleDisconnected      (void (*fptr)(const ssrc_t&))                                        { _disconnectedCallback = fptr; }
 #ifdef USE_EXT_CALLBACKS
@@ -114,6 +119,12 @@ class AppleMIDISession
 		rtpMidiClock.Init(rtpMidiClock.Now(), MIDI_SAMPLING_RATE_DEFAULT);
     }
 
+    void end()
+    {
+ 		controlPort.stop();
+		dataPort.stop();
+    }
+
 	bool beginTransmission(MIDI_NAMESPACE::MidiType)
 	{
         // All MIDI commands queued up in the same cycle (during 1 loop execution)