Arduino-BLE-MIDI/src/hardware/BLEMIDI_ESP32.h

#pragma once

// Headers for ESP32 BLE
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#include <BLE2902.h>

BEGIN_BLEMIDI_NAMESPACE

class BLEMIDI_ESP32
{
private:
    BLEServer *_server = nullptr;
    BLEAdvertising *_advertising = nullptr;
    BLECharacteristic *_characteristic = nullptr;

    BLEMIDI_Transport<class BLEMIDI_ESP32> *_bleMidiTransport = nullptr;

    friend class MyServerCallbacks;
    friend class MyCharacteristicCallbacks;

protected:
    QueueHandle_t mRxQueue;

public:
    BLEMIDI_ESP32()
    {
    }

    bool begin(const char *, BLEMIDI_Transport<class BLEMIDI_ESP32> *);

    void end()
    {
        Serial.println("end");
    }

    void write(uint8_t *buffer, size_t length)
    {
        _characteristic->setValue(buffer, length);
        _characteristic->notify();
    }

    bool available(byte *pvBuffer)
    {
        return xQueueReceive(mRxQueue, pvBuffer, 0); // return immediately when the queue is empty
    }

    void add(byte value)
    {
        // called from BLE-MIDI, to add it to a buffer here
        xQueueSend(mRxQueue, &value, portMAX_DELAY);
    }

protected:
    void receive(uint8_t *buffer, size_t length)
    {
        // parse the incoming buffer
        _bleMidiTransport->receive(buffer, length);
    }

    void connected()
    {
        if (_bleMidiTransport->_connectedCallback)
            _bleMidiTransport->_connectedCallback();
    }

    void disconnected()
    {
        if (_bleMidiTransport->_disconnectedCallback)
            _bleMidiTransport->_disconnectedCallback();

        end();
    }
};

class MyServerCallbacks : public BLEServerCallbacks
{
public:
    MyServerCallbacks(BLEMIDI_ESP32 *bluetoothEsp32)
        : _bluetoothEsp32(bluetoothEsp32)
    {
    }

protected:
    BLEMIDI_ESP32 *_bluetoothEsp32 = nullptr;

    void onConnect(BLEServer *)
    {
        if (_bluetoothEsp32)
            _bluetoothEsp32->connected();
    };

    void onDisconnect(BLEServer *server)
    {
        if (_bluetoothEsp32)
            _bluetoothEsp32->disconnected();

        server->getAdvertising()->start();
    }
};

class MyCharacteristicCallbacks : public BLECharacteristicCallbacks
{
public:
    MyCharacteristicCallbacks(BLEMIDI_ESP32 *bluetoothEsp32)
        : _bluetoothEsp32(bluetoothEsp32)
    {
    }

protected:
    BLEMIDI_ESP32 *_bluetoothEsp32 = nullptr;

    void onWrite(BLECharacteristic *characteristic)
    {
        std::string rxValue = characteristic->getValue();
        if (rxValue.length() > 0)
        {
            _bluetoothEsp32->receive((uint8_t *)(rxValue.c_str()), rxValue.length());
        }
    }
};

bool BLEMIDI_ESP32::begin(const char *deviceName, BLEMIDI_Transport<class BLEMIDI_ESP32> *bleMidiTransport)
{
    _bleMidiTransport = bleMidiTransport;

    BLEDevice::init(deviceName);

    // To communicate between the 2 cores.
    // Core_0 runs here, core_1 runs the BLE stack
    mRxQueue = xQueueCreate(64, sizeof(uint8_t)); // TODO Settings::MaxBufferSize

    _server = BLEDevice::createServer();
    _server->setCallbacks(new MyServerCallbacks(this));

    // Create the BLE Service
    auto service = _server->createService(BLEUUID(SERVICE_UUID));

    // Create a BLE Characteristic
    _characteristic = service->createCharacteristic(
        BLEUUID(CHARACTERISTIC_UUID),
        BLECharacteristic::PROPERTY_READ |
            BLECharacteristic::PROPERTY_WRITE |
            BLECharacteristic::PROPERTY_NOTIFY |
            BLECharacteristic::PROPERTY_WRITE_NR);
    // Add CCCD 0x2902 to allow notify
    _characteristic->addDescriptor(new BLE2902());

    _characteristic->setCallbacks(new MyCharacteristicCallbacks(this));

    auto _security = new BLESecurity();
    _security->setAuthenticationMode(ESP_LE_AUTH_BOND);

    // Start the service
    service->start();

    // Start advertising
    _advertising = _server->getAdvertising();
    _advertising->addServiceUUID(service->getUUID());
    _advertising->setAppearance(0x00);
    _advertising->start();

    Serial.println("begin");

    return true;
}

/*! \brief Create an instance for ESP32 named <DeviceName>
 */
#define BLEMIDI_CREATE_INSTANCE(DeviceName, Name)                                                 \
    BLEMIDI_NAMESPACE::BLEMIDI_Transport<BLEMIDI_NAMESPACE::BLEMIDI_ESP32> BLE##Name(DeviceName); \
    MIDI_NAMESPACE::MidiInterface<BLEMIDI_NAMESPACE::BLEMIDI_Transport<BLEMIDI_NAMESPACE::BLEMIDI_ESP32>, BLEMIDI_NAMESPACE::MySettings> Name((BLEMIDI_NAMESPACE::BLEMIDI_Transport<BLEMIDI_NAMESPACE::BLEMIDI_ESP32> &)BLE##Name);

/*! \brief Create a default instance for ESP32 named BLE-MIDI
 */
#define BLEMIDI_CREATE_DEFAULT_INSTANCE() \
    BLEMIDI_CREATE_INSTANCE("Esp32-BLE-MIDI", MIDI)

END_BLEMIDI_NAMESPACE