Add BLE MIDI transport (feature_bluetooth)

include/ble_midi_transport.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <cstdint>
+#include <functional>
+#include "midi_transport.h"
+
+class BleMidiTransport {
+public:
+    BleMidiTransport();
+    ~BleMidiTransport();
+
+    bool begin();
+    void update();
+
+    void on_midi_receive(std::function<void(const MidiEvent&)> callback);
+
+    void send_note_on(uint8_t channel, uint8_t note, uint8_t velocity);
+    void send_note_off(uint8_t channel, uint8_t note, uint8_t velocity);
+    void send_cc(uint8_t channel, uint8_t cc, uint8_t value);
+
+    bool is_connected();
+
+private:
+    std::function<void(const MidiEvent&)> receive_callback;
+    bool initialized;
+    bool client_connected;
+
+    void send_midi_packet(const uint8_t* data, uint8_t len);
+    void on_receive(const uint8_t* data, size_t len);
+    size_t parse_ble_midi(uint8_t status, const uint8_t* data, size_t len, size_t offset, MidiEvent& event);
+};