//
// Copyright 2015 Google, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "service/adapter.h"
#include <atomic>
#include <mutex>
#include <string>
#include <unordered_set>
#include <base/logging.h>
#include <base/observer_list.h>
#include "service/a2dp_sink.h"
#include "service/a2dp_source.h"
#include "service/avrcp_control.h"
#include "service/avrcp_target.h"
#include "service/common/bluetooth/util/atomic_string.h"
#include "service/gatt_client.h"
#include "service/gatt_server.h"
#include "service/hal/bluetooth_interface.h"
#include "service/logging_helpers.h"
#include "service/low_energy_advertiser.h"
#include "service/low_energy_client.h"
#include "service/low_energy_scanner.h"
using std::lock_guard;
using std::mutex;
namespace bluetooth {
namespace {
RemoteDeviceProps ParseRemoteDeviceProps(int num_properties,
bt_property_t* properties) {
std::string name;
std::string address;
std::vector<Uuid> service_uuids;
int32_t device_class = 0;
int32_t device_type = 0;
int32_t rssi = 0;
for (int i = 0; i < num_properties; ++i) {
bt_property_t* property = properties + i;
switch (property->type) {
case BT_PROPERTY_BDNAME: {
if (property->len < 0) {
NOTREACHED() << "Invalid length for BT_PROPERTY_BDNAME";
break;
}
bt_bdname_t* hal_name = reinterpret_cast<bt_bdname_t*>(property->val);
name = reinterpret_cast<char*>(hal_name->name);
break;
}
case BT_PROPERTY_BDADDR: {
if (property->len != sizeof(RawAddress)) {
NOTREACHED() << "Invalid length for BT_PROPERTY_BDADDR";
break;
}
address = BtAddrString(reinterpret_cast<RawAddress*>(property->val));
break;
}
case BT_PROPERTY_UUIDS: {
if (property->len < 0) {
NOTREACHED() << "Negative length on BT_PROPERTY_UUIDS:";
break;
}
if (property->len % sizeof(Uuid) != 0) {
NOTREACHED() << "Trailing bytes on BT_PROPERTY_UUIDS:";
}
auto uuids = static_cast<const Uuid*>(property->val);
for (size_t i = 0; i < property->len / sizeof(Uuid); ++i) {
service_uuids.push_back(uuids[i]);
}
break;
}
case BT_PROPERTY_CLASS_OF_DEVICE: {
if (property->len != sizeof(int32_t)) {
NOTREACHED() << "Invalid length for BT_PROPERTY_CLASS_OF_DEVICE";
break;
}
device_class = *reinterpret_cast<const int32_t*>(property->val);
break;
}
case BT_PROPERTY_TYPE_OF_DEVICE: {
if (property->len != sizeof(int32_t)) {
NOTREACHED() << "Invalid length for BT_PROPERTY_TYPE_OF_DEVICE";
break;
}
device_type = *reinterpret_cast<const int32_t*>(property->val);
break;
}
case BT_PROPERTY_REMOTE_RSSI: {
if (property->len != sizeof(int8_t)) {
NOTREACHED() << "Invalid length for BT_PROPERTY_REMOTE_RSSI";
break;
}
rssi = *reinterpret_cast<const int8_t*>(property->val);
break;
}
default:
VLOG(1) << "Unhandled adapter property: "
<< BtPropertyText(property->type);
break;
}
}
return RemoteDeviceProps(name, address, service_uuids, device_class,
device_type, rssi);
}
} // namespace
// static
const char Adapter::kDefaultAddress[] = "00:00:00:00:00:00";
// static
const char Adapter::kDefaultName[] = "not-initialized";
// TODO(armansito): The following constants come straight from
// packages/apps/Bluetooth/src/c/a/b/btservice/AdapterService.java. It would be
// nice to know if there were a way to obtain these values from the stack
// instead of hardcoding them here.
// The minimum number of advertising instances required for multi-advertisement
// support.
const int kMinAdvInstancesForMultiAdv = 5;
// Used when determining if offloaded scan filtering is supported.
const int kMinOffloadedFilters = 10;
// Used when determining if offloaded scan batching is supported.
const int kMinOffloadedScanStorageBytes = 1024;
void Adapter::Observer::OnAdapterStateChanged(Adapter* adapter,
AdapterState prev_state,
AdapterState new_state) {
// Default implementation does nothing
}
void Adapter::Observer::OnDeviceConnectionStateChanged(
Adapter* adapter, const std::string& device_address, bool connected) {
// Default implementation does nothing
}
void Adapter::Observer::OnScanEnableChanged(Adapter* adapter,
bool scan_enabled) {
// Default implementation does nothing
}
void Adapter::Observer::OnSspRequest(Adapter* adapter,
const std::string& device_address,
const std::string& device_name, int cod,
int pairing_variant, int pass_key) {
// Default implementation does nothing
}
void Adapter::Observer::OnBondStateChanged(Adapter* adapter, int status,
const std::string& device_address,
int state) {
// Default implementation does nothing
}
void Adapter::Observer::OnGetBondedDevices(
Adapter* adapter, int status,
const std::vector<std::string>& bonded_devices) {
// Default implementation does nothing
}
void Adapter::Observer::OnGetRemoteDeviceProperties(
Adapter* adapter, int status, const std::string& device_address,
const RemoteDeviceProps& properties) {
// Default implementation does nothing
}
void Adapter::Observer::OnDeviceFound(Adapter* adapter,
const RemoteDeviceProps& properties) {
// Default implementation does nothing
}
// The real Adapter implementation used in production.
class AdapterImpl : public Adapter, public hal::BluetoothInterface::Observer {
public:
AdapterImpl()
: state_(ADAPTER_STATE_OFF),
address_(kDefaultAddress),
name_(kDefaultName) {
memset(&local_le_features_, 0, sizeof(local_le_features_));
hal::BluetoothInterface::Get()->AddObserver(this);
a2dp_sink_factory_.reset(new A2dpSinkFactory);
a2dp_source_factory_.reset(new A2dpSourceFactory);
avrcp_control_factory_.reset(new AvrcpControlFactory);
avrcp_target_factory_.reset(new AvrcpTargetFactory);
ble_client_factory_.reset(new LowEnergyClientFactory(*this));
ble_advertiser_factory_.reset(new LowEnergyAdvertiserFactory());
ble_scanner_factory_.reset(new LowEnergyScannerFactory(*this));
gatt_client_factory_.reset(new GattClientFactory());
gatt_server_factory_.reset(new GattServerFactory());
hal::BluetoothInterface::Get()->GetHALInterface()->get_adapter_properties();
}
~AdapterImpl() override {
hal::BluetoothInterface::Get()->RemoveObserver(this);
}
void AddObserver(Adapter::Observer* observer) override {
lock_guard<mutex> lock(observers_lock_);
observers_.AddObserver(observer);
}
void RemoveObserver(Adapter::Observer* observer) override {
lock_guard<mutex> lock(observers_lock_);
observers_.RemoveObserver(observer);
}
AdapterState GetState() const override { return state_.load(); }
bool IsEnabled() const override { return state_.load() == ADAPTER_STATE_ON; }
bool Enable() override {
AdapterState current_state = GetState();
if (current_state != ADAPTER_STATE_OFF) {
LOG(INFO) << "Adapter not disabled - state: "
<< AdapterStateToString(current_state);
return false;
}
// Set the state before calling enable() as there might be a race between
// here and the AdapterStateChangedCallback.
state_ = ADAPTER_STATE_TURNING_ON;
NotifyAdapterStateChanged(current_state, state_);
int status = hal::BluetoothInterface::Get()->GetHALInterface()->enable();
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to enable Bluetooth - status: "
<< BtStatusText((const bt_status_t)status);
state_ = ADAPTER_STATE_OFF;
NotifyAdapterStateChanged(ADAPTER_STATE_TURNING_ON, state_);
return false;
}
return true;
}
bool Disable() override {
if (!IsEnabled()) {
LOG(INFO) << "Adapter is not enabled";
return false;
}
AdapterState current_state = GetState();
// Set the state before calling enable() as there might be a race between
// here and the AdapterStateChangedCallback.
state_ = ADAPTER_STATE_TURNING_OFF;
NotifyAdapterStateChanged(current_state, state_);
int status = hal::BluetoothInterface::Get()->GetHALInterface()->disable();
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to disable Bluetooth - status: "
<< BtStatusText((const bt_status_t)status);
state_ = current_state;
NotifyAdapterStateChanged(ADAPTER_STATE_TURNING_OFF, state_);
return false;
}
return true;
}
std::string GetName() const override { return name_.Get(); }
bool SetName(const std::string& name) override {
bt_bdname_t hal_name;
size_t max_name_len = sizeof(hal_name.name);
// Include the \0 byte in size measurement.
if (name.length() >= max_name_len) {
LOG(ERROR) << "Given name \"" << name << "\" is larger than maximum"
<< " allowed size: " << max_name_len;
return false;
}
strncpy(reinterpret_cast<char*>(hal_name.name), name.c_str(),
name.length() + 1);
VLOG(1) << "Setting adapter name: " << name;
if (!SetAdapterProperty(BT_PROPERTY_BDNAME, &hal_name, sizeof(hal_name))) {
LOG(ERROR) << "Failed to set adapter name: " << name;
return false;
}
return true;
}
std::string GetAddress() const override { return address_.Get(); }
bool SetScanMode(int scan_mode) override {
switch (scan_mode) {
case BT_SCAN_MODE_NONE:
case BT_SCAN_MODE_CONNECTABLE:
case BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE:
break;
default:
LOG(ERROR) << "Unknown scan mode: " << scan_mode;
return false;
}
auto bd_scanmode = static_cast<bt_scan_mode_t>(scan_mode);
if (!SetAdapterProperty(BT_PROPERTY_ADAPTER_SCAN_MODE, &bd_scanmode,
sizeof(bd_scanmode))) {
LOG(ERROR) << "Failed to set scan mode to : " << scan_mode;
return false;
}
return true;
}
bool SetScanEnable(bool scan_enable) override {
if (scan_enable) {
int status =
hal::BluetoothInterface::Get()->GetHALInterface()->start_discovery();
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to enable scanning";
return false;
}
} else {
int status =
hal::BluetoothInterface::Get()->GetHALInterface()->cancel_discovery();
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to disable scanning";
return false;
}
}
return true;
}
bool SspReply(const std::string& device_address, int variant, bool accept,
int32_t pass_key) override {
RawAddress addr;
if (!RawAddress::FromString(device_address, addr)) {
LOG(ERROR) << "Invalid device address given: " << device_address;
return false;
}
int status = hal::BluetoothInterface::Get()->GetHALInterface()->ssp_reply(
&addr, static_cast<bt_ssp_variant_t>(variant), accept, pass_key);
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to send SSP response - status: "
<< BtStatusText((const bt_status_t)status);
return false;
}
return true;
}
bool CreateBond(const std::string& device_address, int transport) override {
RawAddress addr;
if (!RawAddress::FromString(device_address, addr)) {
LOG(ERROR) << "Invalid device address given: " << device_address;
return false;
}
int status = hal::BluetoothInterface::Get()->GetHALInterface()->create_bond(
&addr, transport);
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to create bond - status: "
<< BtStatusText((const bt_status_t)status);
return false;
}
return true;
}
bool IsMultiAdvertisementSupported() override {
lock_guard<mutex> lock(local_le_features_lock_);
return local_le_features_.max_adv_instance >= kMinAdvInstancesForMultiAdv;
}
bool IsDeviceConnected(const std::string& device_address) override {
lock_guard<mutex> lock(connected_devices_lock_);
return connected_devices_.find(device_address) != connected_devices_.end();
}
int GetTotalNumberOfTrackableAdvertisements() override {
lock_guard<mutex> lock(local_le_features_lock_);
return local_le_features_.total_trackable_advertisers;
}
bool IsOffloadedFilteringSupported() override {
lock_guard<mutex> lock(local_le_features_lock_);
return local_le_features_.max_adv_filter_supported >= kMinOffloadedFilters;
}
bool IsOffloadedScanBatchingSupported() override {
lock_guard<mutex> lock(local_le_features_lock_);
return local_le_features_.scan_result_storage_size >=
kMinOffloadedScanStorageBytes;
}
bool GetBondedDevices() override {
int status =
hal::BluetoothInterface::Get()->GetHALInterface()->get_adapter_property(
BT_PROPERTY_ADAPTER_BONDED_DEVICES);
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to get bonded devices. Status: "
<< BtStatusText(static_cast<bt_status_t>(status));
return false;
}
return true;
}
bool RemoveBond(const std::string& device_address) override {
RawAddress addr;
if (!RawAddress::FromString(device_address, addr)) {
LOG(ERROR) << "Invalid device address given: " << device_address;
return false;
}
int status =
hal::BluetoothInterface::Get()->GetHALInterface()->remove_bond(&addr);
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to send remove bond - status: "
<< BtStatusText(static_cast<bt_status_t>(status));
return false;
}
return true;
}
bool GetRemoteDeviceProperties(const std::string& device_address) override {
RawAddress addr;
if (!RawAddress::FromString(device_address, addr)) {
LOG(ERROR) << "Invalid device address given: " << device_address;
return false;
}
int status = hal::BluetoothInterface::Get()
->GetHALInterface()
->get_remote_device_properties(&addr);
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "Failed to send GetRemoteDeviceProperties - status: "
<< BtStatusText((const bt_status_t)status);
return false;
}
return true;
}
A2dpSinkFactory* GetA2dpSinkFactory() const override {
return a2dp_sink_factory_.get();
}
A2dpSourceFactory* GetA2dpSourceFactory() const override {
return a2dp_source_factory_.get();
}
AvrcpControlFactory* GetAvrcpControlFactory() const override {
return avrcp_control_factory_.get();
}
AvrcpTargetFactory* GetAvrcpTargetFactory() const override {
return avrcp_target_factory_.get();
}
LowEnergyClientFactory* GetLowEnergyClientFactory() const override {
return ble_client_factory_.get();
}
LowEnergyAdvertiserFactory* GetLeAdvertiserFactory() const override {
return ble_advertiser_factory_.get();
}
LowEnergyScannerFactory* GetLeScannerFactory() const override {
return ble_scanner_factory_.get();
}
GattClientFactory* GetGattClientFactory() const override {
return gatt_client_factory_.get();
}
GattServerFactory* GetGattServerFactory() const override {
return gatt_server_factory_.get();
}
// hal::BluetoothInterface::Observer overrides.
void AdapterStateChangedCallback(bt_state_t state) override {
LOG(INFO) << "Adapter state changed: " << BtStateText(state);
AdapterState prev_state = GetState();
switch (state) {
case BT_STATE_OFF:
state_ = ADAPTER_STATE_OFF;
break;
case BT_STATE_ON:
state_ = ADAPTER_STATE_ON;
break;
default:
NOTREACHED();
}
NotifyAdapterStateChanged(prev_state, GetState());
}
void AdapterPropertiesCallback(bt_status_t status, int num_properties,
bt_property_t* properties) override {
LOG(INFO) << "Adapter properties changed";
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "status: " << BtStatusText(status);
for (int i = 0; i < num_properties; ++i) {
bt_property_t* property = properties + i;
if (property->type == BT_PROPERTY_ADAPTER_BONDED_DEVICES) {
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnGetBondedDevices(this, status, {});
}
}
}
return;
}
for (int i = 0; i < num_properties; i++) {
bt_property_t* property = properties + i;
switch (property->type) {
case BT_PROPERTY_BDADDR: {
std::string address =
BtAddrString(reinterpret_cast<RawAddress*>(property->val));
LOG(INFO) << "Adapter address changed: " << address;
address_.Set(address);
break;
}
case BT_PROPERTY_BDNAME: {
bt_bdname_t* hal_name = reinterpret_cast<bt_bdname_t*>(property->val);
std::string name = reinterpret_cast<char*>(hal_name->name);
LOG(INFO) << "Adapter name changed: " << name;
name_.Set(name);
break;
}
case BT_PROPERTY_LOCAL_LE_FEATURES: {
lock_guard<mutex> lock(local_le_features_lock_);
if (property->len != sizeof(bt_local_le_features_t)) {
LOG(WARNING) << "Malformed value received for property: "
<< "BT_PROPERTY_LOCAL_LE_FEATURES";
break;
}
bt_local_le_features_t* features =
reinterpret_cast<bt_local_le_features_t*>(property->val);
memcpy(&local_le_features_, features, sizeof(*features));
LOG(INFO) << "Supported LE features updated";
break;
}
case BT_PROPERTY_ADAPTER_BONDED_DEVICES: {
if (property->len < 0) {
NOTREACHED() << "Negative property length";
break;
}
auto addrs = reinterpret_cast<const RawAddress*>(property->val);
if (property->len % sizeof(addrs[0]) != 0) {
LOG(ERROR) << "Invalid property length: " << property->len;
// TODO(bcf): Seems to be a bug where we hit this somewhat
// frequently.
break;
}
std::vector<std::string> str_addrs;
for (size_t i = 0; i < property->len / sizeof(addrs[0]); ++i)
str_addrs.push_back(BtAddrString(addrs + i));
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnGetBondedDevices(this, status, str_addrs);
}
break;
}
default:
VLOG(1) << "Unhandled adapter property: "
<< BtPropertyText(property->type);
break;
}
// TODO(armansito): notify others of the updated properties
}
}
void RemoteDevicePropertiesCallback(bt_status_t status,
RawAddress* remote_bdaddr,
int num_properties,
bt_property_t* properties) override {
std::string device_address = BtAddrString(remote_bdaddr);
if (status != BT_STATUS_SUCCESS) {
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnGetRemoteDeviceProperties(this, status, device_address,
RemoteDeviceProps());
}
return;
}
RemoteDeviceProps props =
ParseRemoteDeviceProps(num_properties, properties);
std::string address = BtAddrString(remote_bdaddr);
props.set_address(address);
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnGetRemoteDeviceProperties(this, status, device_address, props);
}
}
void DeviceFoundCallback(int num_properties,
bt_property_t* properties) override {
RemoteDeviceProps props =
ParseRemoteDeviceProps(num_properties, properties);
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnDeviceFound(this, props);
}
}
void DiscoveryStateChangedCallback(bt_discovery_state_t state) override {
bool enabled = false;
switch (state) {
case BT_DISCOVERY_STOPPED:
enabled = false;
break;
case BT_DISCOVERY_STARTED:
enabled = true;
break;
default:
NOTREACHED();
}
for (auto& observer : observers_) {
observer.OnScanEnableChanged(this, enabled);
}
}
void SSPRequestCallback(RawAddress* remote_bdaddr, bt_bdname_t* bd_name,
uint32_t cod, bt_ssp_variant_t pairing_variant,
uint32_t pass_key) override {
std::string device_address = BtAddrString(remote_bdaddr);
std::string name = reinterpret_cast<char*>(bd_name->name);
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnSspRequest(this, device_address, name, cod, pairing_variant,
pass_key);
}
}
void BondStateChangedCallback(bt_status_t status, RawAddress* remote_bdaddr,
bt_bond_state_t state) override {
std::string device_address = BtAddrString(remote_bdaddr);
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnBondStateChanged(this, status, device_address, state);
}
}
void AclStateChangedCallback(bt_status_t status,
const RawAddress& remote_bdaddr,
bt_acl_state_t state) override {
std::string device_address = BtAddrString(&remote_bdaddr);
bool connected = (state == BT_ACL_STATE_CONNECTED);
LOG(INFO) << "ACL state changed: " << device_address
<< " - connected: " << (connected ? "true" : "false");
// If this is reported with an error status, I suppose the best thing we can
// do is to log it and ignore the event.
if (status != BT_STATUS_SUCCESS) {
LOG(ERROR) << "status: " << BtStatusText(status);
return;
}
// Introduce a scope to manage |connected_devices_lock_| with RAII.
{
lock_guard<mutex> lock(connected_devices_lock_);
if (connected)
connected_devices_.insert(device_address);
else
connected_devices_.erase(device_address);
}
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnDeviceConnectionStateChanged(this, device_address, connected);
}
}
// Sends a request to set the given HAL adapter property type and value.
bool SetAdapterProperty(bt_property_type_t type, void* value, int length) {
CHECK(length > 0);
CHECK(value);
bt_property_t property;
property.len = length;
property.val = value;
property.type = type;
int status =
hal::BluetoothInterface::Get()->GetHALInterface()->set_adapter_property(
&property);
if (status != BT_STATUS_SUCCESS) {
VLOG(1) << "Failed to set property";
return false;
}
return true;
}
// Helper for invoking the AdapterStateChanged observer method.
void NotifyAdapterStateChanged(AdapterState prev_state,
AdapterState new_state) {
if (prev_state == new_state) return;
lock_guard<mutex> lock(observers_lock_);
for (auto& observer : observers_) {
observer.OnAdapterStateChanged(this, prev_state, new_state);
}
}
private:
// The current adapter state.
std::atomic<AdapterState> state_;
// The Bluetooth device address of the local adapter in string from
// (i.e.. XX:XX:XX:XX:XX:XX)
util::AtomicString address_;
// The current local adapter name.
util::AtomicString name_;
// The current set of supported LE features as obtained from the stack. The
// values here are all initially set to 0 and updated when the corresponding
// adapter property has been received from the stack.
std::mutex local_le_features_lock_;
bt_local_le_features_t local_le_features_;
// List of observers that are interested in notifications from us.
std::mutex observers_lock_;
base::ObserverList<Adapter::Observer> observers_;
// List of devices addresses that are currently connected.
std::mutex connected_devices_lock_;
std::unordered_set<std::string> connected_devices_;
// Factory used to create per-app A2dpSink instances.
std::unique_ptr<A2dpSinkFactory> a2dp_sink_factory_;
// Factory used to create per-app A2dpSource instances.
std::unique_ptr<A2dpSourceFactory> a2dp_source_factory_;
// Factory used to create per-app AvrcpControl instances.
std::unique_ptr<AvrcpControlFactory> avrcp_control_factory_;
// Factory used to create per-app AvrcpTarget instances.
std::unique_ptr<AvrcpTargetFactory> avrcp_target_factory_;
// Factory used to create per-app LowEnergyClient instances.
std::unique_ptr<LowEnergyClientFactory> ble_client_factory_;
// Factory used to create per-app LeAdvertiser instances.
std::unique_ptr<LowEnergyAdvertiserFactory> ble_advertiser_factory_;
// Factory used to create per-app LeScanner instances.
std::unique_ptr<LowEnergyScannerFactory> ble_scanner_factory_;
// Factory used to create per-app GattClient instances.
std::unique_ptr<GattClientFactory> gatt_client_factory_;
// Factory used to create per-app GattServer instances.
std::unique_ptr<GattServerFactory> gatt_server_factory_;
DISALLOW_COPY_AND_ASSIGN(AdapterImpl);
};
// static
std::unique_ptr<Adapter> Adapter::Create() {
return std::unique_ptr<Adapter>(new AdapterImpl());
}
} // namespace bluetooth