#include <BLE-MIDI.h>
#include <BLE-MIDI_Config.h>

BLEMIDI_CREATE_DEFAULT_INSTANCE()

unsigned long t0 = millis();
unsigned long t1 = millis();
bool isConnected = false;

// -----------------------------------------------------------------------------
//
// -----------------------------------------------------------------------------
void setup()
{
  Serial.begin(115200);
  while (!Serial);

  MIDI.begin();

  Serial.println("booting!");

  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);

  BLEMIDI.setHandleConnected(OnConnected);
  BLEMIDI.setHandleDisconnected(OnDisconnected);

  MIDI.setHandleNoteOn(OnNoteOn);
  MIDI.setHandleNoteOff(OnNoteOff);
}

// -----------------------------------------------------------------------------
//
// -----------------------------------------------------------------------------
void loop()
{
  MIDI.read();

  if (isConnected && (millis() - t0) > 1000)
  {
    t0 = millis();

    MIDI.sendNoteOn (60, 100, 1); // note 60, velocity 127 on channel 1
  }
  if (isConnected && (millis() - t1) > 1250)
  {
    t1 = millis();

    MIDI.sendNoteOff(60,   0, 1);
  }
}

// ====================================================================================
// Event handlers for incoming MIDI messages
// ====================================================================================

// -----------------------------------------------------------------------------
// Device connected
// -----------------------------------------------------------------------------
void OnConnected() {
  isConnected = true;
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("connected!");
}

// -----------------------------------------------------------------------------
// Device disconnected
// -----------------------------------------------------------------------------
void OnDisconnected() {
  isConnected = false;
  digitalWrite(LED_BUILTIN, LOW);
  Serial.println("disconnected!");
}

// -----------------------------------------------------------------------------
// Received note on
// -----------------------------------------------------------------------------
void OnNoteOn(byte channel, byte note, byte velocity) {
  Serial.println("note on");
}

// -----------------------------------------------------------------------------
// Received note off
// -----------------------------------------------------------------------------
void OnNoteOff(byte channel, byte note, byte velocity) {
  Serial.println("note off");
}