src/connectivity/bluetooth/core/bt-host/hci/android_extended_low_energy_advertiser.cc - fuchsia - Git at Google

 // Copyright 2022 The Fuchsia Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "src/connectivity/bluetooth/core/bt-host/hci/android_extended_low_energy_advertiser.h"

 #include "src/connectivity/bluetooth/core/bt-host/hci-spec/vendor_protocol.h"
 #include "src/connectivity/bluetooth/core/bt-host/transport/transport.h"

 namespace bt::hci {

 constexpr int8_t kTransmitPower = -25;  // Android range -70 to +20, select the middle for now

 namespace hci_android = hci_spec::vendor::android;

 AndroidExtendedLowEnergyAdvertiser::AndroidExtendedLowEnergyAdvertiser(
     fxl::WeakPtr<Transport> hci_ptr, uint8_t max_advertisements)
     : LowEnergyAdvertiser(std::move(hci_ptr)),
       max_advertisements_(max_advertisements),
       advertising_handle_map_(max_advertisements_),
       weak_ptr_factory_(this) {
   auto self = weak_ptr_factory_.GetWeakPtr();
   state_changed_event_handler_id_ = hci()->command_channel()->AddVendorEventHandler(
       hci_android::kLEMultiAdvtStateChangeSubeventCode, [self](const EventPacket& event_packet) {
         if (self) {
           return self->OnAdvertisingStateChangedSubevent(event_packet);
         }

         return CommandChannel::EventCallbackResult::kRemove;
       });
 }

 AndroidExtendedLowEnergyAdvertiser::~AndroidExtendedLowEnergyAdvertiser() {
   hci()->command_channel()->RemoveEventHandler(state_changed_event_handler_id_);
   StopAdvertising();
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildEnablePacket(
     const DeviceAddress& address, hci_spec::GenericEnableParam enable) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtEnableCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtEnableCommandParams>();
   payload->opcode = hci_android::kLEMultiAdvtEnableSubopcode;
   payload->enable = enable;
   payload->adv_handle = handle.value();
   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetAdvertisingParams(
     const DeviceAddress& address, hci_spec::LEAdvertisingType type,
     hci_spec::LEOwnAddressType own_address_type, AdvertisingIntervalRange interval) {
   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtParamCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtParamCommandParams>();

   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.MapHandle(address);
   if (!handle) {
     bt_log(WARN, "hci-le", "could not (al)locate advertising handle for address: %s",
            bt_str(address));
     return nullptr;
   }

   payload->opcode = hci_android::kLEMultiAdvtSetAdvtParamSubopcode;
   payload->adv_interval_min = htole16(interval.min());
   payload->adv_interval_max = htole16(interval.max());
   payload->adv_type = type;
   payload->own_address_type = own_address_type;
   payload->adv_channel_map = hci_spec::kLEAdvertisingChannelAll;
   payload->adv_filter_policy = hci_spec::LEAdvFilterPolicy::kAllowAll;
   payload->adv_handle = handle.value();
   payload->adv_tx_power = hci_spec::kLEExtendedAdvertisingTxPowerNoPreference;

   // We don't support directed advertising yet, so leave peer_address and peer_address_type as 0x00
   // (|packet| parameters are initialized to zero above).

   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetAdvertisingData(
     const DeviceAddress& address, const AdvertisingData& data, AdvFlags flags) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtDataCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtDataCommandParams>();

   payload->opcode = hci_android::kLEMultiAdvtSetAdvtDataSubopcode;
   payload->adv_data_length = data.CalculateBlockSize(/*include_flags=*/true);
   payload->adv_handle = handle.value();

   MutableBufferView data_view(payload->adv_data, payload->adv_data_length);
   data.WriteBlock(&data_view, flags);

   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildUnsetAdvertisingData(
     const DeviceAddress& address) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtDataCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtDataCommandParams>();

   payload->opcode = hci_android::kLEMultiAdvtSetAdvtDataSubopcode;
   payload->adv_data_length = 0;
   payload->adv_handle = handle.value();

   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetScanResponse(
     const DeviceAddress& address, const AdvertisingData& scan_rsp) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetScanRespCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetScanRespCommandParams>();

   payload->opcode = hci_android::kLEMultiAdvtSetScanRespSubopcode;
   payload->scan_rsp_data_length = scan_rsp.CalculateBlockSize();
   payload->adv_handle = handle.value();

   MutableBufferView scan_rsp_view(payload->scan_rsp_data, payload->scan_rsp_data_length);
   scan_rsp.WriteBlock(&scan_rsp_view, std::nullopt);
   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildUnsetScanResponse(
     const DeviceAddress& address) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetScanRespCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetScanRespCommandParams>();

   payload->opcode = hci_android::kLEMultiAdvtSetScanRespSubopcode;
   payload->scan_rsp_data_length = 0;
   payload->adv_handle = handle.value();

   return packet;
 }

 std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildRemoveAdvertisingSet(
     const DeviceAddress& address) {
   std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
   ZX_ASSERT(handle);

   std::unique_ptr<CommandPacket> packet = CommandPacket::New(
       hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtEnableCommandParams));
   packet->mutable_view()->mutable_payload_data().SetToZeros();
   auto payload = packet->mutable_payload<hci_android::LEMultiAdvtEnableCommandParams>();
   payload->opcode = hci_android::kLEMultiAdvtEnableSubopcode;
   payload->enable = hci_spec::GenericEnableParam::kDisable;
   payload->adv_handle = handle.value();
   return packet;
 }

 void AndroidExtendedLowEnergyAdvertiser::StartAdvertising(const DeviceAddress& address,
                                                           const AdvertisingData& data,
                                                           const AdvertisingData& scan_rsp,
                                                           AdvertisingOptions options,
                                                           ConnectionCallback connect_callback,
                                                           ResultFunction<> result_callback) {
   AdvertisingData copied_data;
   data.Copy(&copied_data);

   AdvertisingData copied_scan_rsp;
   scan_rsp.Copy(&copied_scan_rsp);

   // if there is an operation currently in progress, enqueue this operation and we will get to it
   // the next time we have a chance
   if (!hci_cmd_runner().IsReady()) {
     bt_log(INFO, "hci-le", "hci cmd runner not ready, queuing advertisement commands for now");

     op_queue_.push([this, address, data = std::move(copied_data),
                     scan_rsp = std::move(copied_scan_rsp), options,
                     conn_cb = std::move(connect_callback),
                     result_cb = std::move(result_callback)]() mutable {
       StartAdvertising(address, data, scan_rsp, options, std::move(conn_cb), std::move(result_cb));
     });

     return;
   }

   fitx::result<HostError> result = CanStartAdvertising(address, data, scan_rsp, options);
   if (result.is_error()) {
     result_callback(ToResult(result.error_value()));
     return;
   }

   if (IsAdvertising(address)) {
     bt_log(DEBUG, "hci-le", "updating existing advertisement for %s", bt_str(address));
   }

   if (options.include_tx_power_level) {
     copied_data.SetTxPower(kTransmitPower);
     copied_scan_rsp.SetTxPower(kTransmitPower);
   }

   StartAdvertisingInternal(address, copied_data, copied_scan_rsp, options.interval, options.flags,
                            std::move(connect_callback), std::move(result_callback));
 }

 void AndroidExtendedLowEnergyAdvertiser::StopAdvertising() {
   LowEnergyAdvertiser::StopAdvertising();
   advertising_handle_map_.Clear();

   // std::queue doesn't have a clear method so we have to resort to this tomfoolery :(
   decltype(op_queue_) empty;
   std::swap(op_queue_, empty);
 }

 void AndroidExtendedLowEnergyAdvertiser::StopAdvertising(const DeviceAddress& address) {
   // if there is an operation currently in progress, enqueue this operation and we will get to it
   // the next time we have a chance
   if (!hci_cmd_runner().IsReady()) {
     bt_log(INFO, "hci-le", "hci cmd runner not ready, queueing stop advertising command for now");
     op_queue_.push([this, address]() { StopAdvertising(address); });
     return;
   }

   LowEnergyAdvertiser::StopAdvertisingInternal(address);
   advertising_handle_map_.RemoveAddress(address);
 }

 void AndroidExtendedLowEnergyAdvertiser::OnIncomingConnection(
     hci_spec::ConnectionHandle handle, hci_spec::ConnectionRole role,
     const DeviceAddress& peer_address, const hci_spec::LEConnectionParameters& conn_params) {
   staged_connections_map_[handle] = {role, peer_address, conn_params};
 }

 // The LE multi-advertising state change subevent contains the mapping between connection handle and
 // advertising handle. After the LE multi-advertising state change subevent, we have all the
 // information necessary to create a connection object within the Host layer.
 CommandChannel::EventCallbackResult
 AndroidExtendedLowEnergyAdvertiser::OnAdvertisingStateChangedSubevent(const EventPacket& event) {
   ZX_ASSERT(event.event_code() == hci_spec::kVendorDebugEventCode);
   ZX_ASSERT(event.params<hci_spec::VendorEventParams>().subevent_code ==
             hci_android::kLEMultiAdvtStateChangeSubeventCode);

   Result<> result = event.ToResult();
   if (bt_is_error(result, ERROR, "hci-le", "advertising state change event, error received %s",
                   bt_str(result))) {
     return CommandChannel::EventCallbackResult::kContinue;
   }

   auto params = event.subevent_params<hci_android::LEMultiAdvtStateChangeSubeventParams>();
   ZX_ASSERT(params);

   hci_spec::ConnectionHandle connection_handle = params->connection_handle;
   auto staged_parameters_node = staged_connections_map_.extract(connection_handle);

   if (staged_parameters_node.empty()) {
     bt_log(ERROR, "hci-le",
            "advertising state change event, staged params not available (handle: %d)",
            params->adv_handle);
     return CommandChannel::EventCallbackResult::kContinue;
   }

   hci_spec::AdvertisingHandle adv_handle = params->adv_handle;
   std::optional<DeviceAddress> opt_local_address = advertising_handle_map_.GetAddress(adv_handle);

   // We use the identity address as the local address if we aren't advertising or otherwise don't
   // know about this advertising set. This is obviously wrong. However, the link will be
   // disconnected in that case before it can propagate to higher layers.
   static DeviceAddress identity_address = DeviceAddress(DeviceAddress::Type::kLEPublic, {0});
   DeviceAddress local_address = identity_address;
   if (opt_local_address) {
     local_address = opt_local_address.value();
   }

   StagedConnectionParameters staged = staged_parameters_node.mapped();

   CompleteIncomingConnection(connection_handle, staged.role, local_address, staged.peer_address,
                              staged.conn_params);
   return CommandChannel::EventCallbackResult::kContinue;
 }

 void AndroidExtendedLowEnergyAdvertiser::OnCurrentOperationComplete() {
   if (op_queue_.empty()) {
     return;  // no more queued operations so nothing to do
   }

   fit::closure closure = std::move(op_queue_.front());
   op_queue_.pop();
   closure();
 }

 }  // namespace bt::hci
	// Copyright 2022 The Fuchsia Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "src/connectivity/bluetooth/core/bt-host/hci/android_extended_low_energy_advertiser.h"

	#include "src/connectivity/bluetooth/core/bt-host/hci-spec/vendor_protocol.h"
	#include "src/connectivity/bluetooth/core/bt-host/transport/transport.h"

	namespace bt::hci {

	constexpr int8_t kTransmitPower = -25; // Android range -70 to +20, select the middle for now

	namespace hci_android = hci_spec::vendor::android;

	AndroidExtendedLowEnergyAdvertiser::AndroidExtendedLowEnergyAdvertiser(
	fxl::WeakPtr<Transport> hci_ptr, uint8_t max_advertisements)
	: LowEnergyAdvertiser(std::move(hci_ptr)),
	max_advertisements_(max_advertisements),
	advertising_handle_map_(max_advertisements_),
	weak_ptr_factory_(this) {
	auto self = weak_ptr_factory_.GetWeakPtr();
	state_changed_event_handler_id_ = hci()->command_channel()->AddVendorEventHandler(
	hci_android::kLEMultiAdvtStateChangeSubeventCode, [self](const EventPacket& event_packet) {
	if (self) {
	return self->OnAdvertisingStateChangedSubevent(event_packet);
	}

	return CommandChannel::EventCallbackResult::kRemove;
	});
	}

	AndroidExtendedLowEnergyAdvertiser::~AndroidExtendedLowEnergyAdvertiser() {
	hci()->command_channel()->RemoveEventHandler(state_changed_event_handler_id_);
	StopAdvertising();
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildEnablePacket(
	const DeviceAddress& address, hci_spec::GenericEnableParam enable) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtEnableCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtEnableCommandParams>();
	payload->opcode = hci_android::kLEMultiAdvtEnableSubopcode;
	payload->enable = enable;
	payload->adv_handle = handle.value();
	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetAdvertisingParams(
	const DeviceAddress& address, hci_spec::LEAdvertisingType type,
	hci_spec::LEOwnAddressType own_address_type, AdvertisingIntervalRange interval) {
	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtParamCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtParamCommandParams>();

	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.MapHandle(address);
	if (!handle) {
	bt_log(WARN, "hci-le", "could not (al)locate advertising handle for address: %s",
	bt_str(address));
	return nullptr;
	}

	payload->opcode = hci_android::kLEMultiAdvtSetAdvtParamSubopcode;
	payload->adv_interval_min = htole16(interval.min());
	payload->adv_interval_max = htole16(interval.max());
	payload->adv_type = type;
	payload->own_address_type = own_address_type;
	payload->adv_channel_map = hci_spec::kLEAdvertisingChannelAll;
	payload->adv_filter_policy = hci_spec::LEAdvFilterPolicy::kAllowAll;
	payload->adv_handle = handle.value();
	payload->adv_tx_power = hci_spec::kLEExtendedAdvertisingTxPowerNoPreference;

	// We don't support directed advertising yet, so leave peer_address and peer_address_type as 0x00
	// (\|packet\| parameters are initialized to zero above).

	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetAdvertisingData(
	const DeviceAddress& address, const AdvertisingData& data, AdvFlags flags) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtDataCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtDataCommandParams>();

	payload->opcode = hci_android::kLEMultiAdvtSetAdvtDataSubopcode;
	payload->adv_data_length = data.CalculateBlockSize(/include_flags=/true);
	payload->adv_handle = handle.value();

	MutableBufferView data_view(payload->adv_data, payload->adv_data_length);
	data.WriteBlock(&data_view, flags);

	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildUnsetAdvertisingData(
	const DeviceAddress& address) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetAdvtDataCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetAdvtDataCommandParams>();

	payload->opcode = hci_android::kLEMultiAdvtSetAdvtDataSubopcode;
	payload->adv_data_length = 0;
	payload->adv_handle = handle.value();

	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildSetScanResponse(
	const DeviceAddress& address, const AdvertisingData& scan_rsp) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetScanRespCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetScanRespCommandParams>();

	payload->opcode = hci_android::kLEMultiAdvtSetScanRespSubopcode;
	payload->scan_rsp_data_length = scan_rsp.CalculateBlockSize();
	payload->adv_handle = handle.value();

	MutableBufferView scan_rsp_view(payload->scan_rsp_data, payload->scan_rsp_data_length);
	scan_rsp.WriteBlock(&scan_rsp_view, std::nullopt);
	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildUnsetScanResponse(
	const DeviceAddress& address) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtSetScanRespCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtSetScanRespCommandParams>();

	payload->opcode = hci_android::kLEMultiAdvtSetScanRespSubopcode;
	payload->scan_rsp_data_length = 0;
	payload->adv_handle = handle.value();

	return packet;
	}

	std::unique_ptr<CommandPacket> AndroidExtendedLowEnergyAdvertiser::BuildRemoveAdvertisingSet(
	const DeviceAddress& address) {
	std::optional<hci_spec::AdvertisingHandle> handle = advertising_handle_map_.GetHandle(address);
	ZX_ASSERT(handle);

	std::unique_ptr<CommandPacket> packet = CommandPacket::New(
	hci_android::kLEMultiAdvt, sizeof(hci_android::LEMultiAdvtEnableCommandParams));
	packet->mutable_view()->mutable_payload_data().SetToZeros();
	auto payload = packet->mutable_payload<hci_android::LEMultiAdvtEnableCommandParams>();
	payload->opcode = hci_android::kLEMultiAdvtEnableSubopcode;
	payload->enable = hci_spec::GenericEnableParam::kDisable;
	payload->adv_handle = handle.value();
	return packet;
	}

	void AndroidExtendedLowEnergyAdvertiser::StartAdvertising(const DeviceAddress& address,
	const AdvertisingData& data,
	const AdvertisingData& scan_rsp,
	AdvertisingOptions options,
	ConnectionCallback connect_callback,
	ResultFunction<> result_callback) {
	AdvertisingData copied_data;
	data.Copy(&copied_data);

	AdvertisingData copied_scan_rsp;
	scan_rsp.Copy(&copied_scan_rsp);

	// if there is an operation currently in progress, enqueue this operation and we will get to it
	// the next time we have a chance
	if (!hci_cmd_runner().IsReady()) {
	bt_log(INFO, "hci-le", "hci cmd runner not ready, queuing advertisement commands for now");

	op_queue_.push([this, address, data = std::move(copied_data),
	scan_rsp = std::move(copied_scan_rsp), options,
	conn_cb = std::move(connect_callback),
	result_cb = std::move(result_callback)]() mutable {
	StartAdvertising(address, data, scan_rsp, options, std::move(conn_cb), std::move(result_cb));
	});

	return;
	}

	fitx::result<HostError> result = CanStartAdvertising(address, data, scan_rsp, options);
	if (result.is_error()) {
	result_callback(ToResult(result.error_value()));
	return;
	}

	if (IsAdvertising(address)) {
	bt_log(DEBUG, "hci-le", "updating existing advertisement for %s", bt_str(address));
	}

	if (options.include_tx_power_level) {
	copied_data.SetTxPower(kTransmitPower);
	copied_scan_rsp.SetTxPower(kTransmitPower);
	}

	StartAdvertisingInternal(address, copied_data, copied_scan_rsp, options.interval, options.flags,
	std::move(connect_callback), std::move(result_callback));
	}

	void AndroidExtendedLowEnergyAdvertiser::StopAdvertising() {
	LowEnergyAdvertiser::StopAdvertising();
	advertising_handle_map_.Clear();

	// std::queue doesn't have a clear method so we have to resort to this tomfoolery :(
	decltype(op_queue_) empty;
	std::swap(op_queue_, empty);
	}

	void AndroidExtendedLowEnergyAdvertiser::StopAdvertising(const DeviceAddress& address) {
	// if there is an operation currently in progress, enqueue this operation and we will get to it
	// the next time we have a chance
	if (!hci_cmd_runner().IsReady()) {
	bt_log(INFO, "hci-le", "hci cmd runner not ready, queueing stop advertising command for now");
	op_queue_.push([this, address]() { StopAdvertising(address); });
	return;
	}

	LowEnergyAdvertiser::StopAdvertisingInternal(address);
	advertising_handle_map_.RemoveAddress(address);
	}

	void AndroidExtendedLowEnergyAdvertiser::OnIncomingConnection(
	hci_spec::ConnectionHandle handle, hci_spec::ConnectionRole role,
	const DeviceAddress& peer_address, const hci_spec::LEConnectionParameters& conn_params) {
	staged_connections_map_[handle] = {role, peer_address, conn_params};
	}

	// The LE multi-advertising state change subevent contains the mapping between connection handle and
	// advertising handle. After the LE multi-advertising state change subevent, we have all the
	// information necessary to create a connection object within the Host layer.
	CommandChannel::EventCallbackResult
	AndroidExtendedLowEnergyAdvertiser::OnAdvertisingStateChangedSubevent(const EventPacket& event) {
	ZX_ASSERT(event.event_code() == hci_spec::kVendorDebugEventCode);
	ZX_ASSERT(event.params<hci_spec::VendorEventParams>().subevent_code ==
	hci_android::kLEMultiAdvtStateChangeSubeventCode);

	Result<> result = event.ToResult();
	if (bt_is_error(result, ERROR, "hci-le", "advertising state change event, error received %s",
	bt_str(result))) {
	return CommandChannel::EventCallbackResult::kContinue;
	}

	auto params = event.subevent_params<hci_android::LEMultiAdvtStateChangeSubeventParams>();
	ZX_ASSERT(params);

	hci_spec::ConnectionHandle connection_handle = params->connection_handle;
	auto staged_parameters_node = staged_connections_map_.extract(connection_handle);

	if (staged_parameters_node.empty()) {
	bt_log(ERROR, "hci-le",
	"advertising state change event, staged params not available (handle: %d)",
	params->adv_handle);
	return CommandChannel::EventCallbackResult::kContinue;
	}

	hci_spec::AdvertisingHandle adv_handle = params->adv_handle;
	std::optional<DeviceAddress> opt_local_address = advertising_handle_map_.GetAddress(adv_handle);

	// We use the identity address as the local address if we aren't advertising or otherwise don't
	// know about this advertising set. This is obviously wrong. However, the link will be
	// disconnected in that case before it can propagate to higher layers.
	static DeviceAddress identity_address = DeviceAddress(DeviceAddress::Type::kLEPublic, {0});
	DeviceAddress local_address = identity_address;
	if (opt_local_address) {
	local_address = opt_local_address.value();
	}

	StagedConnectionParameters staged = staged_parameters_node.mapped();

	CompleteIncomingConnection(connection_handle, staged.role, local_address, staged.peer_address,
	staged.conn_params);
	return CommandChannel::EventCallbackResult::kContinue;
	}

	void AndroidExtendedLowEnergyAdvertiser::OnCurrentOperationComplete() {
	if (op_queue_.empty()) {
	return; // no more queued operations so nothing to do
	}

	fit::closure closure = std::move(op_queue_.front());
	op_queue_.pop();
	closure();
	}

	} // namespace bt::hci