path: root/system/stack/eatt/eatt_impl.h

/*
 * Copyright 2020 HIMSA II K/S - www.himsa.com. Represented by EHIMA -
 * www.ehima.com
 *
 * 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 <base/logging.h>

#include <map>
#include <queue>

#include "acl_api.h"
#include "bind_helpers.h"
#include "device/include/controller.h"
#include "eatt.h"
#include "l2c_api.h"
#include "osi/include/alarm.h"
#include "osi/include/allocator.h"
#include "stack/btm/btm_sec.h"
#include "stack/gatt/gatt_int.h"
#include "stack/include/bt_hdr.h"
#include "stack/l2cap/l2c_int.h"
#include "types/raw_address.h"

namespace bluetooth {
namespace eatt {

#define BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK 0x01

class eatt_device {
 public:
  RawAddress bda_;
  uint16_t rx_mtu_;
  uint16_t rx_mps_;

  tGATT_TCB* eatt_tcb_;

  std::map<uint16_t, std::shared_ptr<EattChannel>> eatt_channels;

  eatt_device(const RawAddress& bd_addr, uint16_t mtu, uint16_t mps)
      : rx_mtu_(mtu), rx_mps_(mps), eatt_tcb_(nullptr) {
    bda_ = bd_addr;
  }
};

struct eatt_impl {
  std::vector<eatt_device> devices_;
  uint16_t psm_;
  uint16_t default_mtu_;
  uint16_t max_mps_;
  tL2CAP_APPL_INFO reg_info_;

  eatt_impl() {
    default_mtu_ = EATT_DEFAULT_MTU;
    max_mps_ = EATT_MIN_MTU_MPS;
    psm_ = BT_PSM_EATT;
  };

  ~eatt_impl() = default;

  eatt_device* find_device_by_cid(uint16_t lcid) {
    /* This works only because Android CIDs are unique across the ACL
     * connections */
    auto iter = find_if(devices_.begin(), devices_.end(),
                        [&lcid](const eatt_device& ed) {
                          auto it = ed.eatt_channels.find(lcid);
                          return it != ed.eatt_channels.end();
                        });

    return (iter == devices_.end()) ? nullptr : &(*iter);
  }

  EattChannel* find_channel_by_cid(uint16_t lcid) {
    eatt_device* eatt_dev = find_device_by_cid(lcid);
    if (!eatt_dev) return nullptr;

    auto it = eatt_dev->eatt_channels.find(lcid);
    return (it == eatt_dev->eatt_channels.end()) ? nullptr : it->second.get();
  }

  EattChannel* find_channel_by_cid(const RawAddress& bdaddr, uint16_t lcid) {
    eatt_device* eatt_dev = find_device_by_address(bdaddr);
    if (!eatt_dev) return nullptr;

    auto it = eatt_dev->eatt_channels.find(lcid);
    return (it == eatt_dev->eatt_channels.end()) ? nullptr : it->second.get();
  }

  void remove_channel_by_cid(eatt_device* eatt_dev, uint16_t lcid) {
    eatt_dev->eatt_channels.erase(lcid);

    if (eatt_dev->eatt_channels.size() == 0) eatt_dev->eatt_tcb_ = NULL;
  }

  void remove_channel_by_cid(uint16_t lcid) {
    eatt_device* eatt_dev = find_device_by_cid(lcid);
    if (!eatt_dev) return;

    remove_channel_by_cid(eatt_dev, lcid);
  }

  void eatt_l2cap_connect_ind(const RawAddress& bda,
                              std::vector<uint16_t>& lcids, uint16_t psm,
                              uint16_t peer_mtu, uint8_t identifier) {
    /* The assumption is that L2CAP layer already check parameters etc.
     * Get our capabilities and accept all the channels.
     */
    eatt_device* eatt_dev = this->find_device_by_address(bda);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << " unknown device: " << bda;
      L2CA_ConnectCreditBasedRsp(bda, identifier, lcids,
                                 L2CAP_CONN_NO_RESOURCES, NULL);
      return;
    }

    uint16_t max_mps = controller_get_interface()->get_acl_data_size_ble();

    tL2CAP_LE_CFG_INFO local_coc_cfg = {
        .mtu = eatt_dev->rx_mtu_,
        .mps = eatt_dev->rx_mps_ < max_mps ? eatt_dev->rx_mps_ : max_mps,
        .credits = L2CAP_LE_CREDIT_DEFAULT};

    if (!L2CA_ConnectCreditBasedRsp(bda, identifier, lcids, L2CAP_CONN_OK,
                                    &local_coc_cfg))
      return;

    if (!eatt_dev->eatt_tcb_) {
      eatt_dev->eatt_tcb_ =
          gatt_find_tcb_by_addr(eatt_dev->bda_, BT_TRANSPORT_LE);
      CHECK(eatt_dev->eatt_tcb_);
    }

    for (uint16_t cid : lcids) {
      EattChannel* channel = find_eatt_channel_by_cid(bda, cid);
      CHECK(!channel);

      auto chan = std::make_shared<EattChannel>(eatt_dev->bda_, cid, peer_mtu,
                                                eatt_dev->rx_mtu_);
      eatt_dev->eatt_channels.insert({cid, chan});

      chan->EattChannelSetState(EattChannelState::EATT_CHANNEL_OPENED);
      eatt_dev->eatt_tcb_->eatt++;

      LOG(INFO) << __func__ << " Channel connected CID " << loghex(cid);
    }
  }

  void eatt_l2cap_connect_cfm(const RawAddress& bda, uint16_t lcid,
                              uint16_t peer_mtu, uint16_t result) {
    LOG(INFO) << __func__ << " bda: " << bda << " cid: " << +lcid
              << "peer mtu: " << +peer_mtu << " result " << +result;

    eatt_device* eatt_dev = find_device_by_address(bda);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << " unknown device";
      return;
    }

    EattChannel* channel = this->find_channel_by_cid(bda, lcid);
    if (!channel) {
      LOG(ERROR) << __func__ << " unknown cid: " << loghex(lcid);
      return;
    }

    if (result != L2CAP_CONN_OK) {
      LOG(ERROR) << __func__
                 << " Could not connect CoC result: " << loghex(result);
      remove_channel_by_cid(eatt_dev, lcid);
      return;
    }

    channel->EattChannelSetState(EattChannelState::EATT_CHANNEL_OPENED);
    channel->EattChannelSetTxMTU(peer_mtu);

    CHECK(eatt_dev->eatt_tcb_);
    CHECK(eatt_dev->bda_ == channel->bda_);
    eatt_dev->eatt_tcb_->eatt++;

    LOG(INFO) << __func__ << " Channel connected CID " << loghex(lcid);
  }

  void eatt_l2cap_reconfig_completed(const RawAddress& bda, uint16_t lcid,
                                     bool is_local_cfg,
                                     tL2CAP_LE_CFG_INFO* p_cfg) {
    LOG(INFO) << __func__ << "lcid: " << loghex(lcid)
              << " local cfg?: " << is_local_cfg;

    if (p_cfg->result != L2CAP_CFG_OK) {
      LOG(INFO) << __func__ << " reconfig failed lcid: " << loghex(lcid)
                << " result: " << loghex(p_cfg->result);
      return;
    }

    EattChannel* channel = find_channel_by_cid(bda, lcid);
    if (!channel) return;

    /* On this layer we don't care about mps as this is handled in L2CAP layer
     */
    if (is_local_cfg)
      channel->rx_mtu_ = p_cfg->mtu;
    else
      channel->tx_mtu_ = p_cfg->mtu;

    /* Go back to open state */
    channel->EattChannelSetState(EattChannelState::EATT_CHANNEL_OPENED);
  }

  void eatt_l2cap_error_cb(uint16_t lcid, uint16_t reason) {
    LOG(INFO) << __func__ << " cid: " << loghex(lcid) << " reason "
              << loghex(reason);

    /*TODO: provide address in the L2CAP callback */

    EattChannel* channel = find_channel_by_cid(lcid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown lcid";
      return;
    }

    eatt_device* eatt_dev = find_device_by_address(channel->bda_);

    switch (channel->state_) {
      case EattChannelState::EATT_CHANNEL_PENDING:
        LOG(ERROR) << "Connecting failed";
        remove_channel_by_cid(eatt_dev, lcid);
        break;
      case EattChannelState::EATT_CHANNEL_RECONFIGURING:
        /* Just go back to open state */
        LOG(ERROR) << "Reconfig failed";
        channel->EattChannelSetState(EattChannelState::EATT_CHANNEL_OPENED);
        break;
      default:
        LOG(ERROR) << __func__ << "Invalid state: "
                   << static_cast<uint8_t>(channel->state_);
        break;
    }
  }

  void eatt_l2cap_disconnect_ind(uint16_t lcid, bool please_confirm) {
    LOG(INFO) << __func__ << " cid: " << loghex(lcid);
    eatt_device* eatt_dev = find_device_by_cid(lcid);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << " unknown cid: " << loghex(lcid);
      return;
    }

    eatt_dev->eatt_tcb_->eatt--;
    remove_channel_by_cid(eatt_dev, lcid);
  }

  void eatt_l2cap_data_ind(uint16_t lcid, BT_HDR* data_p) {
    LOG(INFO) << __func__ << " cid: " << loghex(lcid);
    eatt_device* eatt_dev = find_device_by_cid(lcid);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << " unknown cid: " << loghex(lcid);
      return;
    }

    EattChannel* channel = find_channel_by_cid(eatt_dev->bda_, lcid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Received data on closed channel "
                 << loghex(lcid);
      return;
    }

    gatt_data_process(*eatt_dev->eatt_tcb_, channel->cid_, data_p);
    osi_free(data_p);
  }

  bool is_eatt_supported_by_peer(const RawAddress& bd_addr) {
    return gatt_profile_get_eatt_support(bd_addr);
  }

  eatt_device* find_device_by_address(const RawAddress& bd_addr) {
    auto iter = find_if(
        devices_.begin(), devices_.end(),
        [&bd_addr](const eatt_device& ed) { return ed.bda_ == bd_addr; });

    return iter == devices_.end() ? nullptr : &(*iter);
  }

  eatt_device* add_eatt_device(const RawAddress& bd_addr) {
    devices_.push_back(eatt_device(bd_addr, default_mtu_, max_mps_));
    eatt_device* eatt_dev = &devices_.back();
    return eatt_dev;
  }

  void connect_eatt(eatt_device* eatt_dev) {
    /* Let us use maximum possible mps */
    if (eatt_dev->rx_mps_ == EATT_MIN_MTU_MPS)
      eatt_dev->rx_mps_ = controller_get_interface()->get_acl_data_size_ble();

    tL2CAP_LE_CFG_INFO local_coc_cfg = {
        .mtu = eatt_dev->rx_mtu_,
        .mps = eatt_dev->rx_mps_,
        .credits = L2CAP_LE_CREDIT_DEFAULT,
    };

    /* Warning! CIDs in Android are unique across the ACL connections */
    std::vector<uint16_t> connecting_cids =
        L2CA_ConnectCreditBasedReq(psm_, eatt_dev->bda_, &local_coc_cfg);

    if (connecting_cids.size() == 0) {
      LOG(ERROR) << "Unable to get cid";
      return;
    }

    LOG(INFO) << __func__
              << "Successfully sent CoC request, number of channel: "
              << +connecting_cids.size();

    for (uint16_t cid : connecting_cids) {
      LOG(INFO) << " \t cid: " << loghex(cid);

      auto chan = std::make_shared<EattChannel>(eatt_dev->bda_, cid, 0,
                                                eatt_dev->rx_mtu_);
      eatt_dev->eatt_channels.insert({cid, chan});
    }

    if (eatt_dev->eatt_tcb_) {
      LOG(INFO) << __func__ << " has tcb ? " << eatt_dev->eatt_tcb_;
      return;
    }

    eatt_dev->eatt_tcb_ =
        gatt_find_tcb_by_addr(eatt_dev->bda_, BT_TRANSPORT_LE);
    CHECK(eatt_dev->eatt_tcb_);
  }

  EattChannel* find_eatt_channel_by_cid(const RawAddress& bd_addr,
                                        uint16_t cid) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);

    LOG(INFO) << __func__ << bd_addr << " " << +cid;

    if (!eatt_dev) return nullptr;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [&cid](const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return el.first == cid;
        });

    return iter == eatt_dev->eatt_channels.end() ? nullptr : iter->second.get();
  }

  EattChannel* find_eatt_channel_by_transid(const RawAddress& bd_addr,
                                            uint32_t trans_id) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return nullptr;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [&trans_id](
            const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return el.second->server_outstanding_cmd_.trans_id == trans_id;
        });

    return iter == eatt_dev->eatt_channels.end() ? nullptr : iter->second.get();
  }

  bool is_indication_pending(const RawAddress& bd_addr,
                             uint16_t indication_handle) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return false;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [&indication_handle](
            const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return el.second->indicate_handle_ == indication_handle;
        });

    return (iter != eatt_dev->eatt_channels.end());
  };

  EattChannel* get_channel_available_for_indication(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [](const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return !GATT_HANDLE_IS_VALID(el.second->indicate_handle_);
        });

    return (iter == eatt_dev->eatt_channels.end()) ? nullptr
                                                   : iter->second.get();
  };

  EattChannel* get_channel_available_for_client_request(
      const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return nullptr;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [](const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return el.second->cl_cmd_q_.empty();
        });

    return (iter == eatt_dev->eatt_channels.end()) ? nullptr
                                                   : iter->second.get();
  }

  void free_gatt_resources(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return;

    auto iter = eatt_dev->eatt_channels.begin();
    while (iter != eatt_dev->eatt_channels.end()) {
      EattChannel* channel = iter->second.get();

      fixed_queue_free(channel->server_outstanding_cmd_.multi_rsp_q, NULL);
      channel->server_outstanding_cmd_.multi_rsp_q = NULL;
    }
  }

  bool is_outstanding_msg_in_send_queue(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return false;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [](const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return !el.second->cl_cmd_q_.empty();
        });
    return (iter != eatt_dev->eatt_channels.end());
  }

  EattChannel* get_channel_with_queued_data(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) return nullptr;

    auto iter = find_if(
        eatt_dev->eatt_channels.begin(), eatt_dev->eatt_channels.end(),
        [](const std::pair<uint16_t, std::shared_ptr<EattChannel>>& el) {
          return !el.second->cl_cmd_q_.empty();
        });
    return (iter == eatt_dev->eatt_channels.end()) ? nullptr
                                                   : iter->second.get();
  }

  static void eatt_ind_ack_timeout(void* data) {
    EattChannel* channel = (EattChannel*)data;
    tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(channel->bda_, BT_TRANSPORT_LE);

    LOG(WARNING) << __func__ << ": send ack now";
    attp_send_cl_confirmation_msg(*p_tcb, channel->cid_);
  }

  static void eatt_ind_confirmation_timeout(void* data) {
    EattChannel* channel = (EattChannel*)data;
    tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(channel->bda_, BT_TRANSPORT_LE);

    LOG(WARNING) << __func__ << " disconnecting...";
    gatt_disconnect(p_tcb);
  }

  void start_indication_confirm_timer(const RawAddress& bd_addr, uint16_t cid) {
    EattChannel* channel = find_eatt_channel_by_cid(bd_addr, cid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown cid: " << loghex(cid) << " or device "
                 << bd_addr;
      return;
    }

    alarm_set_on_mloop(channel->ind_confirmation_timer_,
                       GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                       eatt_ind_confirmation_timeout, channel);
  }

  void stop_indication_confirm_timer(const RawAddress& bd_addr, uint16_t cid) {
    EattChannel* channel = find_eatt_channel_by_cid(bd_addr, cid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown cid: " << loghex(cid) << " or device "
                 << bd_addr;
      return;
    }

    alarm_cancel(channel->ind_confirmation_timer_);
  }

  void start_app_indication_timer(const RawAddress& bd_addr, uint16_t cid) {
    EattChannel* channel = find_eatt_channel_by_cid(bd_addr, cid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown cid: " << loghex(cid) << " or device "
                 << bd_addr;
      return;
    }

    alarm_set_on_mloop(channel->ind_ack_timer_, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                       eatt_ind_ack_timeout, channel);
  }

  void stop_app_indication_timer(const RawAddress& bd_addr, uint16_t cid) {
    EattChannel* channel = find_eatt_channel_by_cid(bd_addr, cid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown cid: " << loghex(cid) << " or device "
                 << bd_addr;
      return;
    }

    alarm_cancel(channel->ind_ack_timer_);
  }

  void reconfigure(const RawAddress& bd_addr, uint16_t cid, uint16_t new_mtu) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << "Unknown device " << bd_addr;
      return;
    }

    EattChannel* channel = find_eatt_channel_by_cid(bd_addr, cid);
    if (!channel) {
      LOG(ERROR) << __func__ << "Unknown cid: " << loghex(cid) << " or device "
                 << bd_addr;
      return;
    }

    if (new_mtu <= channel->rx_mtu_) {
      LOG(ERROR) << __func__ << "Invalid mtu: " << loghex(new_mtu);
      return;
    }

    std::vector<uint16_t> cids = {cid};

    tL2CAP_LE_CFG_INFO cfg = {.mps = eatt_dev->rx_mps_, .mtu = new_mtu};

    if (!L2CA_ReconfigCreditBasedConnsReq(eatt_dev->bda_, cids, &cfg))
      LOG(ERROR) << __func__ << "Could not start reconfig cid: " << loghex(cid)
                 << " or device " << bd_addr;
  }

  void reconfigure_all(const RawAddress& bd_addr, uint16_t new_mtu) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) {
      LOG(ERROR) << __func__ << "Unknown device " << bd_addr;
      return;
    }

    uint8_t num_of_channels = eatt_dev->eatt_channels.size();
    if (num_of_channels == 0) {
      LOG(ERROR) << __func__ << "No channels for device " << bd_addr;
      return;
    }

    std::vector<uint16_t> cids;

    auto iter = eatt_dev->eatt_channels.begin();
    while (iter != eatt_dev->eatt_channels.end()) {
      uint16_t cid = iter->first;
      cids.push_back(cid);
      iter++;
    }

    if (new_mtu <= EATT_MIN_MTU_MPS) {
      LOG(ERROR) << __func__ << "Invalid mtu: " << loghex(new_mtu);
      return;
    }

    tL2CAP_LE_CFG_INFO cfg = {.mps = eatt_dev->rx_mps_, .mtu = new_mtu};

    if (!L2CA_ReconfigCreditBasedConnsReq(eatt_dev->bda_, cids, &cfg))
      LOG(ERROR) << __func__ << "Could not start reconfig for device "
                 << bd_addr;
  }

  void supported_features_cb(uint8_t role, const RawAddress& bd_addr,
                             uint8_t features) {
    bool is_eatt_supported = features & BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK;

    LOG(INFO) << __func__ << " " << bd_addr
              << " is_eatt_supported = " << int(is_eatt_supported);
    if (!is_eatt_supported) return;

    eatt_device* eatt_dev = add_eatt_device(bd_addr);

    if (role != HCI_ROLE_CENTRAL) {
      /* TODO For now do nothing, we could run a timer here and start EATT if
       * not started by central */
      LOG(INFO)
          << " EATT Should be connected by the central. Let's wait for it.";
      return;
    }

    connect_eatt(eatt_dev);
  }

  void disconnect_channel(uint16_t cid) { L2CA_DisconnectReq(cid); }

  void disconnect(const RawAddress& bd_addr) {
    LOG(INFO) << __func__ << " " << bd_addr;

    eatt_device* eatt_dev = find_device_by_address(bd_addr);
    if (!eatt_dev) {
      LOG(WARNING) << __func__ << " no eatt device found";
      return;
    }

    if (!eatt_dev->eatt_tcb_) {
      LOG_ASSERT(eatt_dev->eatt_channels.size() == 0);
      LOG(WARNING) << __func__ << " no eatt channels found";
      return;
    }

    auto iter = eatt_dev->eatt_channels.begin();
    while (iter != eatt_dev->eatt_channels.end()) {
      uint16_t cid = iter->first;
      disconnect_channel(cid);
      /* When initiating disconnection, stack will not notify us that it is
       * done. We need to assume success
       */
      iter = eatt_dev->eatt_channels.erase(iter);
    }
    eatt_dev->eatt_tcb_->eatt = 0;
    eatt_dev->eatt_tcb_ = nullptr;
  }

  void connect(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);

    uint8_t role = L2CA_GetBleConnRole(bd_addr);
    if (role == HCI_ROLE_UNKNOWN) {
      LOG(ERROR) << __func__ << "Could not get device role" << bd_addr;
      return;
    }

    LOG(INFO) << __func__ << " device " << bd_addr << " role"
              << (role == HCI_ROLE_CENTRAL ? "central" : "peripheral");

    if (eatt_dev) {
      /* We are reconnecting device we know that support EATT.
       * Just connect CoC
       */
      LOG(INFO) << __func__ << " Known device, connect eCoC";

      if (role != HCI_ROLE_CENTRAL) {
        LOG(INFO)
            << " EATT Should be connected by the central. Let's wait for it.";
        return;
      }

      connect_eatt(eatt_dev);
      return;
    }

    /* For new device, first read GATT server supported features. */
    if (gatt_cl_read_sr_supp_feat_req(
            bd_addr, base::BindOnce(&eatt_impl::supported_features_cb,
                                    base::Unretained(this), role)) == false) {
      LOG(INFO) << __func__ << "Eatt is not supported. Checked for device "
                << bd_addr;
    }
  }

  void add_from_storage(const RawAddress& bd_addr) {
    eatt_device* eatt_dev = find_device_by_address(bd_addr);

    LOG(INFO) << __func__ << ", restoring: " << bd_addr;

    if (!eatt_dev) add_eatt_device(bd_addr);
  }
};

}  // namespace eatt
}  // namespace bluetooth