diff --git a/src/Ble_esp32.h b/src/Ble_esp32.h
index ea0592a..ee5b9d8 100644
--- a/src/Ble_esp32.h
+++ b/src/Ble_esp32.h
@@ -5,7 +5,7 @@
 #include <BLEUtils.h>
 #include <BLEServer.h>
 
-#include "AbstractMidiInterface.h"
+#include "utility/AbstractMidiInterface.h"
 using namespace Midi;
 
 BEGIN_BLEMIDI_NAMESPACE
@@ -20,6 +20,8 @@ protected:
     
     bool _connected;
     
+    uint8_t _midiPacket[5];
+    
 public:
     // callbacks
     void(*_connectedCallback)() = NULL;
@@ -72,61 +74,45 @@ protected:
         *timestamp = (currentTimeStamp & 0x7F) | 0x80;            // 7 bits plus MSB
     }
     
-    void sendChannelMessage1(byte type, byte channel, byte data1)
+    void serialize(DataByte b1)
     {
-        uint8_t midiPacket[4];
+        getMidiTimestamp(&_midiPacket[0], &_midiPacket[1]);
+ 
+        _midiPacket[2] = b1;
+
+        // TODO: quid running status
         
-        getMidiTimestamp(&midiPacket[0], &midiPacket[1]);
-        midiPacket[2] = (type & 0xf0) | ((channel - 1) & 0x0f);
-        midiPacket[3] = data1;
-        pCharacteristic->setValue(midiPacket, 4);
+        pCharacteristic->setValue(_midiPacket, 3);
         pCharacteristic->notify();
-    }
+    };
     
-    void sendChannelMessage2(byte type, byte channel, byte data1, byte data2)
+    void serialize(DataByte b1, DataByte b2)
     {
-        uint8_t midiPacket[5];
-        
-        getMidiTimestamp(&midiPacket[0], &midiPacket[1]);
-        midiPacket[2] = (type & 0xf0) | ((channel - 1) & 0x0f);
-        midiPacket[3] = data1;
-        midiPacket[4] = data2;
-        pCharacteristic->setValue(midiPacket, 5);
+        getMidiTimestamp(&_midiPacket[0], &_midiPacket[1]);
+
+        _midiPacket[2] = b1;
+        _midiPacket[3] = b2;
+
+        // TODO: quid running status
+
+        pCharacteristic->setValue(_midiPacket, 4);
         pCharacteristic->notify();
-    }
+    };
     
-    void sendSystemCommonMessage1(byte type, byte data1)
+    void serialize(DataByte b1, DataByte b2, DataByte b3)
     {
-        uint8_t midiPacket[4];
+        getMidiTimestamp(&_midiPacket[0], &_midiPacket[1]);
         
-        getMidiTimestamp(&midiPacket[0], &midiPacket[1]);
-        midiPacket[2] = type;
-        midiPacket[3] = data1;
-        pCharacteristic->setValue(midiPacket, 4);
+        _midiPacket[2] = b1;
+        _midiPacket[3] = b2;
+        _midiPacket[4] = b3;
+
+        // TODO: quid running status
+
+        pCharacteristic->setValue(_midiPacket, 5);
         pCharacteristic->notify();
-    }
-    
-    void sendSystemCommonMessage2(byte type, byte data1, byte data2)
-    {
-        uint8_t midiPacket[5];
-        
-        getMidiTimestamp(&midiPacket[0], &midiPacket[1]);
-        midiPacket[2] = type;
-        midiPacket[3] = data1;
-        midiPacket[4] = data2;
-        pCharacteristic->setValue(midiPacket, 5);
-        pCharacteristic->notify();
-    }
-    
-    void sendRealTimeMessage(byte type)
-    {
-        uint8_t midiPacket[3];
-        
-        getMidiTimestamp(&midiPacket[0], &midiPacket[1]);
-        midiPacket[2] = type;
-        pCharacteristic->setValue(midiPacket, 3);
-        pCharacteristic->notify();
-    }
+   };
+
 
 public:
     BleMidiInterface()
@@ -149,12 +135,7 @@ public:
         _connected = false;
         _disconnectedCallback = fptr;
     }
-
-    //
-    void send(MidiType type, DataByte data1, DataByte data2, Channel channel) {
-        
-    }
-
+    
 };
 
 class MyServerCallbacks: public BLEServerCallbacks {
diff --git a/src/utility/AbstractMidiInterface.h b/src/utility/AbstractMidiInterface.h
index 316d350..8825435 100644
--- a/src/utility/AbstractMidiInterface.h
+++ b/src/utility/AbstractMidiInterface.h
@@ -68,7 +68,7 @@ typedef byte MIDI_VELOCITY;
 typedef byte MIDI_PRESSURE;
 
 /*! Enumeration of MIDI types */
-enum class MidiType
+enum MidiType : uint8_t
 {
     InvalidType           = 0x00,    ///< For notifying errors
     NoteOff               = 0x80,    ///< Note Off
@@ -110,7 +110,7 @@ struct Thru
  See the detailed controllers numbers & description here:
  http://www.somascape.org/midi/tech/spec.html#ctrlnums
  */
-enum class MidiControlChangeNumber
+enum MidiControlChangeNumber : uint8_t
 {
     // High resolution Continuous Controllers MSB (+32 for LSB) ----------------
     BankSelect                  = 0,
@@ -212,6 +212,13 @@ static MidiType getTypeFromStatusByte(byte status)
     return MidiType(status);
 }
 
+/*! \brief Returns type + channel
+ */
+static StatusByte getStatus(MidiType type, Channel channel)
+{
+    return ( type & 0xf0) | ((channel - 1) & 0x0f);
+}
+
 /*! \brief Returns channel in the range 1-16
  */
 static Channel getChannelFromStatusByte(byte status)
@@ -400,8 +407,57 @@ public:
     }
     
 protected:
-    // this method needs to be overwritten to add the specific Serial, BLE or AppleMIDI serializers
-    virtual void send(MidiType type, DataByte data1, DataByte data2, Channel channel) = 0;
+    // Channel messages
+    virtual void send(MidiType type, DataByte data1, DataByte data2, Channel channel)
+    {
+        // Then test if channel is valid
+        if (channel >= MIDI_CHANNEL_OFF  ||
+            channel == MIDI_CHANNEL_OMNI ||
+            type < 0x80)
+        {
+            return; // Don't send anything
+        }
+        
+        if (type <= MidiType::PitchBend)  // Channel messages
+        {
+            // Protection: remove MSBs on data
+            data1 &= 0x7f;
+            data2 &= 0x7f;
+            
+            const StatusByte status = getStatus(type, channel);
+
+            if (type != MidiType::ProgramChange && type != MidiType::AfterTouchChannel)
+            {
+                serialize(status, data1, data2);
+            }
+            else
+            {
+                serialize(status, data1);
+            }
+        }
+        else if (type >= MidiType::Clock && type <= MidiType::SystemReset)
+        {
+            serialize(type); // System Real-time and 1 byte.
+        }
+    }
+    
+    // SystemCommon message
+    virtual void send(MidiType type, DataByte data1, DataByte data2)
+    {
+        
+    }
+    
+    // realTime
+    virtual void send(MidiType type)
+    {
+        
+    }
+    
+    virtual void serialize(DataByte) = 0;
+    virtual void serialize(DataByte, DataByte) = 0;
+    virtual void serialize(DataByte, DataByte, DataByte) = 0;
+
+protected:
 };
 
 }