added end() method, stop'ping BLE

src/BLEMIDI_Transport.h

@@ -48,6 +48,11 @@ public:
         mBleClass.begin(mDeviceName, this);
     }	
 
+    void end()
+    {
+        mBleClass.end();
+    }
+
     bool beginTransmission(MIDI_NAMESPACE::MidiType type)
     {
         getMidiTimestamp(&mTxBuffer[0], &mTxBuffer[1]);

src/hardware/BLE-MIDI_Client_ESP32.h

@@ -22,6 +22,11 @@ public:
     
 	bool begin(const char*, BLEMIDI<class BLEMIDI_Client_ESP32>*);
 
+    void end() 
+    {
+        
+    }
+        
     void write(uint8_t* data, uint8_t length)
     {
         _characteristic->setValue(data, length);

src/hardware/BLEMIDI_ArduinoBLE.h

@@ -75,6 +75,11 @@ public:
     
 	bool begin(const char*, BLEMIDI_Transport<class BLEMIDI_ArduinoBLE>*);
     
+    void end() 
+    {
+        
+    }
+
     void write(uint8_t* buffer, size_t length)
     {
         // TODO: test length

src/hardware/BLEMIDI_ESP32.h

@@ -30,6 +30,11 @@ public:
     
 	bool begin(const char*, BLEMIDI_Transport<class BLEMIDI_ESP32>*);
     
+    void end() 
+    {
+        
+    }
+
     void write(uint8_t* buffer, size_t length)
     {
         _characteristic->setValue(buffer, length);

src/hardware/BLEMIDI_ESP32_NimBLE.h

@@ -27,6 +27,11 @@ public:
     
 	bool begin(const char*, BLEMIDI_Transport<class BLEMIDI_ESP32_NimBLE>*);
     
+    void end() 
+    {
+        
+    }
+
     void write(uint8_t* buffer, size_t length)
     {
         _characteristic->setValue(buffer, length);

src/hardware/BLEMIDI_nRF52.h

@@ -24,6 +24,11 @@ public:
     
 	bool begin(const char*, BLEMIDI_NAMESPACE::BLEMIDI_Transport<class BLEMIDI_nRF52>*);
     
+    void end() 
+    {
+        
+    }
+
     void write(uint8_t* buffer, size_t length)
     {
     }