Getting started on a port to OSX.

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diff --git a/ble/OsxBluetooth.mm b/ble/OsxBluetooth.mm
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+#import <CoreFoundation/CoreFoundation.h>
+#import <IOBluetooth/IOBluetoothUtilities.h>
+#import <IOBluetooth/objc/IOBluetoothSDPUUID.h>
+#import <IOBluetooth/objc/IOBluetoothSDPServiceRecord.h>
+
+#import "BluetoothImpl.h"
+#import "OsxBluetooth.h"
+
+#include <map>
+using namespace std;
+
+namespace trygvis {
+namespace bluetooth {
+namespace osx {
+
+class OsxBluetoothDevice;
+class OsxBluetoothGatt;
+
+class OsxBluetoothDevice : public DefaultBluetoothDevice<OsxBluetoothAdapter> {
+public:
+    OsxBluetoothDevice(OsxBluetoothAdapter &adapter, Mac &mac);
+
+    ~OsxBluetoothDevice();
+
+    shared_ptr<BluetoothGatt> connectGatt() override;
+
+private:
+    weak_ptr<OsxBluetoothGatt> gatt;
+};
+
+class OsxBluetoothGatt : public DefaultBluetoothGatt<OsxBluetoothDevice> {
+public:
+    OsxBluetoothGatt(OsxBluetoothDevice &device);
+
+    ~OsxBluetoothGatt();
+
+    OsxBluetoothGatt(const OsxBluetoothGatt&) = delete;
+
+    OsxBluetoothGatt& operator=(const OsxBluetoothGatt&) = delete;
+
+    bool isConnected() const override;
+
+    void discoverServices() override;
+
+    void writeValue(const BluetoothGattCharacteristic &c, const ByteBuffer &bytes) override;
+
+    ByteBuffer readValue(const BluetoothGattCharacteristic &c) override;
+
+private:
+    void connect();
+
+    void disconnect();
+
+    vector<AttributeData> discoverServices(uint16_t startHandle);
+
+    vector<AttributeData> discoverCharacteristics(uint16_t startHandle, uint16_t endHandle);
+
+    ByteBuffer writeAndRead(ByteBuffer &out, shared_ptr<uint8_t> buffer, size_t size);
+
+    int l2cap;
+
+    bool connected;
+};
+
+OsxBluetoothAdapter::OsxBluetoothAdapter(const string name, Mac &mac) : DefaultBluetoothAdapter(name, mac) {
+}
+
+OsxBluetoothAdapter::~OsxBluetoothAdapter() {
+}
+
+void OsxBluetoothAdapter::startScan() {
+}
+
+void OsxBluetoothAdapter::stopScan() {
+}
+
+void OsxBluetoothAdapter::runScan(std::function<void(BluetoothDevice &device)>) {
+}
+
+BluetoothDevice &OsxBluetoothAdapter::getDevice(Mac &mac) {
+    map<Mac, OsxBluetoothDevice *>::iterator it = devices.find(mac);
+
+    if (it == devices.end()) {
+        OsxBluetoothDevice *device = new OsxBluetoothDevice(*this, mac);
+        devices[mac] = device;
+        return *device;
+    }
+
+    return *it->second;
+}
+
+OsxBluetoothDevice::OsxBluetoothDevice(OsxBluetoothAdapter &adapter, Mac &mac) : DefaultBluetoothDevice(adapter, mac) {
+}
+
+OsxBluetoothDevice::~OsxBluetoothDevice() {
+}
+
+shared_ptr<BluetoothGatt> OsxBluetoothDevice::connectGatt() {
+    if (auto p = gatt.lock()) {
+        return p;
+    }
+    auto ref = make_shared<OsxBluetoothGatt>(*this);
+
+    gatt = ref;
+
+    return ref;
+}
+
+// -----------------------------------------------------------------------
+// Gatt
+// -----------------------------------------------------------------------
+
+OsxBluetoothGatt::OsxBluetoothGatt(OsxBluetoothDevice &device) :
+        DefaultBluetoothGatt(device) {
+    connect();
+}
+
+OsxBluetoothGatt::~OsxBluetoothGatt() {
+    disconnect();
+}
+
+bool OsxBluetoothGatt::isConnected() const {
+    return connected;
+}
+
+void OsxBluetoothGatt::connect() {
+}
+
+void OsxBluetoothGatt::disconnect() {
+    if (!connected) {
+        return;
+    }
+}
+
+void OsxBluetoothGatt::writeValue(const BluetoothGattCharacteristic &c, const ByteBuffer &bytes) {
+}
+
+ByteBuffer OsxBluetoothGatt::readValue(const BluetoothGattCharacteristic &c) {
+    shared_ptr<uint8_t> buffer(new uint8_t[0]);
+
+    return ByteBuffer(buffer, 0);
+}
+
+void OsxBluetoothGatt::discoverServices() {
+}
+
+/*
+ByteBuffer OsxBluetoothGatt::writeAndRead(ByteBuffer &out, shared_ptr<uint8_t> buffer, size_t size) {
+}
+
+vector<AttributeData> OsxBluetoothGatt::discoverServices(uint16_t startHandle) {
+}
+
+vector<AttributeData> OsxBluetoothGatt::discoverCharacteristics(uint16_t startHandle, uint16_t endHandle) {
+}
+*/
+
+// -----------------------------------------------------------------------
+// OsxBluetoothSystem
+// -----------------------------------------------------------------------
+
+
+// We only have a single adapter on OSX.
+shared_ptr<OsxBluetoothAdapter> adapter;
+
+shared_ptr<OsxBluetoothAdapter>&& getAdapterImpl() {
+    if(!adapter) {
+        auto mac = Mac::parseMac("00:00:00:00:00:00");
+        adapter = make_shared<OsxBluetoothAdapter>("system", mac);
+    }
+
+    return std::move(adapter);
+}
+
+void shutdownImpl() {
+    adapter.reset();
+}
+
+}
+}
+}