ble_client_base.cpp

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#include "ble_client_base.h"
 
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
 
#ifdef USE_ESP32
 
#include <esp_gap_ble_api.h>
#include <esp_gatt_defs.h>
#include <esp_gattc_api.h>
 
namespace esphome::esp32_ble_client {
 
static const char *const TAG = "esp32_ble_client";
 
// Connection parameters are shared with the other GATT client backends
// (ble_device_base/ble_client_state.h) so the platforms cannot drift.
using ble_device_base::FAST_CONN_TIMEOUT;
using ble_device_base::FAST_MAX_CONN_INTERVAL;
using ble_device_base::FAST_MIN_CONN_INTERVAL;
using ble_device_base::MEDIUM_CONN_TIMEOUT;
using ble_device_base::MEDIUM_MAX_CONN_INTERVAL;
using ble_device_base::MEDIUM_MIN_CONN_INTERVAL;
static constexpr uint32_t DISCONNECTING_TIMEOUT = 10000;  // 10s
static const esp_bt_uuid_t NOTIFY_DESC_UUID = {
    .len = ESP_UUID_LEN_16,
    .uuid =
        {
            .uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG,
        },
};
 
void BLEClientBase::setup() {
  static uint8_t connection_index = 0;
  this->connection_index_ = connection_index++;
}
 
void BLEClientBase::set_state(espbt::ClientState st) {
  ESP_LOGV(TAG, "[%d] [%s] Set state %d", this->connection_index_, this->address_str_, (int) st);
  ESPBTClient::set_state(st);
}
 
void BLEClientBase::loop() {
  if (!esp32_ble::global_ble->is_active()) {
    // ble_before_disabled_event_handler() resets the client.
    return;
  }
  if (this->state() == espbt::ClientState::INIT) {
    auto ret = esp_ble_gattc_app_register(this->app_id);
    if (ret) {
      ESP_LOGE(TAG, "gattc app register failed. app_id=%d code=%d", this->app_id, ret);
      this->mark_failed();
    }
    this->set_state(espbt::ClientState::IDLE);
  }
  // If idle, we can disable the loop as connect()
  // will enable it again when a connection is needed.
  else if (this->state() == espbt::ClientState::IDLE) {
    this->disable_loop();
  } else if (this->state() == espbt::ClientState::DISCONNECTING &&
             (millis() - this->disconnecting_started_) > DISCONNECTING_TIMEOUT) {
    ESP_LOGE(TAG, "[%d] [%s] Timeout waiting for CLOSE_EVT after disconnect, forcing IDLE", this->connection_index_,
             this->address_str_);
    // release_services() must be called before set_idle_() — if we entered DISCONNECTING
    // via unconditional_disconnect() (which doesn't call release_services()), and ESP-IDF
    // never delivered CLOSE_EVT/DISCONNECT_EVT, services would leak without this call.
    this->release_services();
    this->set_idle_();
    this->on_disconnect_complete(ESP_GATT_CONN_TIMEOUT);
  }
}
 
float BLEClientBase::get_setup_priority() const { return setup_priority::AFTER_BLUETOOTH; }
 
void BLEClientBase::ble_before_disabled_event_handler() {
  auto st = this->state();
  if (st != espbt::ClientState::IDLE && st != espbt::ClientState::INIT) {
    // No CLOSE_EVT will come: free the services and settle the link.
    this->release_services();
    this->set_idle_();
    this->on_disconnect_complete(ESP_GATT_CONN_TERMINATE_LOCAL_HOST);
  }
  // The interface belongs to the torn-down stack.
  this->gattc_if_ = ESP_GATT_IF_NONE;
  this->set_state(espbt::ClientState::INIT);
  // An idle client runs no loop; the INIT branch must run to register again.
  this->enable_loop();
}
 
void BLEClientBase::dump_config() {
  ESP_LOGCONFIG(TAG,
                "  Address: %s\n"
                "  Auto-Connect: %s\n"
                "  State: %s",
                this->address_str(), TRUEFALSE(this->auto_connect_), espbt::client_state_to_string(this->state()));
  if (this->status_ == ESP_GATT_NO_RESOURCES) {
    ESP_LOGE(TAG, "  Failed due to no resources. Try to reduce number of BLE clients in config.");
  } else if (this->status_ != ESP_GATT_OK) {
    ESP_LOGW(TAG, "  Failed due to error code %d", this->status_);
  }
}
 
#ifdef USE_ESP32_BLE_DEVICE
bool BLEClientBase::parse_device(const espbt::ESPBTDevice &device) {
  if (!this->auto_connect_)
    return false;
  if (this->address_ == 0 || device.address_uint64() != this->address_)
    return false;
  if (this->state() != espbt::ClientState::IDLE)
    return false;
  // Not registered on this stack yet; promoting now would stop the scan for a
  // connect that connect() rejects anyway.
  if (this->gattc_if_ == ESP_GATT_IF_NONE)
    return false;
 
  this->log_event_("Found device");
  if (ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_DEBUG)
    esp32_ble_tracker::global_esp32_ble_tracker->print_bt_device_info(device);
 
  this->set_state(espbt::ClientState::DISCOVERED);
  this->set_address(device.address_uint64());
  this->remote_addr_type_ = device.get_address_type();
  return true;
}
#endif
 
void BLEClientBase::connect() {
  // Prevent duplicate connection attempts or connecting while still disconnecting
  if (this->state() == espbt::ClientState::CONNECTING || this->state() == espbt::ClientState::CONNECTED ||
      this->state() == espbt::ClientState::ESTABLISHED) {
    ESP_LOGW(TAG, "[%d] [%s] Connection already in progress, state=%s", this->connection_index_, this->address_str_,
             espbt::client_state_to_string(this->state()));
    return;
  } else if (this->state() == espbt::ClientState::DISCONNECTING) {
    ESP_LOGW(TAG, "[%d] [%s] Cannot connect, still waiting for CLOSE_EVT to complete disconnect",
             this->connection_index_, this->address_str_);
    return;
  }
  if (this->gattc_if_ == ESP_GATT_IF_NONE) {
    // Bluedroid drops an open on an unknown interface without any event.
    this->log_warning_("Connect rejected, GATT app not registered");
    // INIT stays so loop() still registers; only a promoted client goes back.
    if (this->state() == espbt::ClientState::DISCOVERED) {
      this->set_state(espbt::ClientState::IDLE);
    }
    return;
  }
  ESP_LOGI(TAG, "[%d] [%s] 0x%02x Connecting", this->connection_index_, this->address_str_, this->remote_addr_type_);
  this->paired_ = false;
  // A registration whose event never arrived must not block this connection's release.
  this->services_released_ = false;
  this->pending_notify_regs_ = 0;
  // Enable loop for state processing
  this->enable_loop();
  // Immediately transition to CONNECTING to prevent duplicate connection attempts
  this->set_state(espbt::ClientState::CONNECTING);
 
  // Determine connection parameters based on connection type
  if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
    // V3 without cache needs fast params for service discovery
    this->set_conn_params_(FAST_MIN_CONN_INTERVAL, FAST_MAX_CONN_INTERVAL, 0, FAST_CONN_TIMEOUT, "fast");
  } else if (this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
    // V3 with cache can use medium params
    this->set_conn_params_(MEDIUM_MIN_CONN_INTERVAL, MEDIUM_MAX_CONN_INTERVAL, 0, MEDIUM_CONN_TIMEOUT, "medium");
  }
  // For V1/Legacy, don't set params - use ESP-IDF defaults
 
  // Open the connection
  auto ret = esp_ble_gattc_open(this->gattc_if_, this->remote_bda_, this->remote_addr_type_, true);
  this->handle_connection_result_(ret);
}
 
esp_err_t BLEClientBase::pair() { return esp_ble_set_encryption(this->remote_bda_, ESP_BLE_SEC_ENCRYPT); }
 
void BLEClientBase::disconnect() {
  if (this->state() == espbt::ClientState::IDLE || this->state() == espbt::ClientState::DISCONNECTING) {
    ESP_LOGI(TAG, "[%d] [%s] Disconnect requested, but already %s", this->connection_index_, this->address_str_,
             espbt::client_state_to_string(this->state()));
    return;
  }
  if (this->state() == espbt::ClientState::CONNECTING || this->conn_id_ == UNSET_CONN_ID) {
    ESP_LOGD(TAG, "[%d] [%s] Disconnect before connected, disconnect scheduled", this->connection_index_,
             this->address_str_);
    this->want_disconnect_ = true;
    return;
  }
  this->unconditional_disconnect();
}
 
void BLEClientBase::unconditional_disconnect() {
  // Disconnect without checking the state.
  ESP_LOGI(TAG, "[%d] [%s] Disconnecting (conn_id: %d).", this->connection_index_, this->address_str_, this->conn_id_);
  if (this->state() == espbt::ClientState::DISCONNECTING) {
    this->log_error_("Already disconnecting");
    return;
  }
  if (this->conn_id_ == UNSET_CONN_ID) {
    this->log_error_("conn id unset, cannot disconnect");
    return;
  }
  auto err = esp_ble_gattc_close(this->gattc_if_, this->conn_id_);
  if (err != ESP_OK) {
    //
    // This is a fatal error, but we can't do anything about it
    // and it likely means the BLE stack is in a bad state.
    //
    // In the future we might consider App.reboot() here since
    // the BLE stack is in an indeterminate state.
    //
    this->log_gattc_warning_("esp_ble_gattc_close", err);
  }
 
  if (this->state() == espbt::ClientState::DISCOVERED) {
    this->set_address(0);
    this->set_state(espbt::ClientState::IDLE);
  } else {
    this->set_disconnecting_();
  }
}
 
void BLEClientBase::release_services() {
#ifdef USE_ESP32_BLE_DEVICE
  for (auto &svc : this->services_)
    delete svc;  // NOLINT(cppcoreguidelines-owning-memory)
  this->services_.clear();
#endif
#ifndef CONFIG_BT_GATTC_CACHE_NVS_FLASH
  // Only the cache clean makes the stack's database unsafe to walk.
  this->services_released_ = true;
  // A stack on its way down frees its own cache.
  if (esp32_ble::global_ble->is_active()) {
    esp_ble_gattc_cache_clean(this->remote_bda_);
  }
#endif
}
 
esp_err_t BLEClientBase::register_for_notify(uint16_t char_handle) {
  esp_err_t err = esp_ble_gattc_register_for_notify(this->gattc_if_, this->remote_bda_, char_handle);
  if (err != ESP_OK)
    return err;
  if (this->pending_notify_regs_ == UINT8_MAX) {
    // Saturating undercounts, so the release can run before the last registration completes.
    // Wrapping to zero would undercount by the full range instead, which is worse.
    this->log_warning_("Too many outstanding notify registrations to track");
    return err;
  }
  this->pending_notify_regs_++;
  return err;
}
 
void BLEClientBase::log_event_(const char *name) {
  ESP_LOGD(TAG, "[%d] [%s] %s", this->connection_index_, this->address_str_, name);
}
 
void BLEClientBase::log_gattc_lifecycle_event_(const char *name) {
  ESP_LOGD(TAG, "[%d] [%s] ESP_GATTC_%s_EVT", this->connection_index_, this->address_str_, name);
}
 
void BLEClientBase::log_gattc_data_event_(const char *name) {
  // Data transfer events are logged at VERBOSE level because logging to UART creates
  // delays that cause timing issues during time-sensitive BLE operations. This is
  // especially problematic during pairing or firmware updates which require rapid
  // writes to many characteristics - the log spam can cause these operations to fail.
  ESP_LOGV(TAG, "[%d] [%s] ESP_GATTC_%s_EVT", this->connection_index_, this->address_str_, name);
}
 
void BLEClientBase::log_gattc_warning_(const char *operation, esp_gatt_status_t status) {
  ESP_LOGW(TAG, "[%d] [%s] %s error, status=%d", this->connection_index_, this->address_str_, operation, status);
}
 
void BLEClientBase::log_gattc_warning_(const char *operation, esp_err_t err) {
  ESP_LOGW(TAG, "[%d] [%s] %s error, status=%d", this->connection_index_, this->address_str_, operation, err);
}
 
void BLEClientBase::log_connection_params_(const char *param_type) {
  ESP_LOGD(TAG, "[%d] [%s] %s conn params", this->connection_index_, this->address_str_, param_type);
}
 
void BLEClientBase::handle_connection_result_(esp_err_t ret) {
  if (ret) {
    this->log_gattc_warning_("esp_ble_gattc_open", ret);
    // Don't use set_idle_() here — CONNECT_EVT never fired so conn_id_ is still UNSET_CONN_ID.
    this->set_state(espbt::ClientState::IDLE);
  }
}
 
void BLEClientBase::log_error_(const char *message) {
  ESP_LOGE(TAG, "[%d] [%s] %s", this->connection_index_, this->address_str_, message);
}
 
void BLEClientBase::log_error_(const char *message, int code) {
  ESP_LOGE(TAG, "[%d] [%s] %s=%d", this->connection_index_, this->address_str_, message, code);
}
 
void BLEClientBase::log_warning_(const char *message) {
  ESP_LOGW(TAG, "[%d] [%s] %s", this->connection_index_, this->address_str_, message);
}
 
esp_err_t BLEClientBase::update_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency,
                                             uint16_t timeout, const char *param_type) {
  esp_ble_conn_update_params_t conn_params = {{0}};
  memcpy(conn_params.bda, this->remote_bda_, sizeof(esp_bd_addr_t));
  conn_params.min_int = min_interval;
  conn_params.max_int = max_interval;
  conn_params.latency = latency;
  conn_params.timeout = timeout;
  this->log_connection_params_(param_type);
  esp_err_t err = esp_ble_gap_update_conn_params(&conn_params);
  if (err != ESP_OK) {
    this->log_gattc_warning_("esp_ble_gap_update_conn_params", err);
  }
  return err;
}
 
void BLEClientBase::set_conn_params_(uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout,
                                     const char *param_type) {
  // Set preferred connection parameters before connecting
  // These will be used when establishing the connection
  this->log_connection_params_(param_type);
  esp_err_t err = esp_ble_gap_set_prefer_conn_params(this->remote_bda_, min_interval, max_interval, latency, timeout);
  if (err != ESP_OK) {
    this->log_gattc_warning_("esp_ble_gap_set_prefer_conn_params", err);
  }
}
 
bool BLEClientBase::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t esp_gattc_if,
                                        esp_ble_gattc_cb_param_t *param) {
  if (event == ESP_GATTC_REG_EVT && this->app_id != param->reg.app_id)
    return false;
  if (event != ESP_GATTC_REG_EVT && esp_gattc_if != ESP_GATT_IF_NONE && esp_gattc_if != this->gattc_if_)
    return false;
 
  ESP_LOGV(TAG, "[%d] [%s] gattc_event_handler: event=%d gattc_if=%d", this->connection_index_, this->address_str_,
           event, esp_gattc_if);
 
  switch (event) {
    case ESP_GATTC_REG_EVT: {
      if (param->reg.status == ESP_GATT_OK) {
        ESP_LOGV(TAG, "[%d] [%s] gattc registered app id %d", this->connection_index_, this->address_str_,
                 this->app_id);
        this->gattc_if_ = esp_gattc_if;
      } else {
        this->log_error_("gattc app registration failed status", param->reg.status);
        this->status_ = param->reg.status;
        this->mark_failed();
      }
      break;
    }
    case ESP_GATTC_OPEN_EVT: {
      if (!this->check_addr(param->open.remote_bda))
        return false;
      this->log_gattc_lifecycle_event_("OPEN");
      // conn_id was already set in ESP_GATTC_CONNECT_EVT
      this->service_count_ = 0;
 
      // ESP-IDF's BLE stack may send ESP_GATTC_OPEN_EVT after esp_ble_gattc_open() returns an
      // error, if the error occurred at the BTA/GATT layer. This can result in the event
      // arriving after we've already transitioned to IDLE state.
      if (this->state() == espbt::ClientState::IDLE) {
        ESP_LOGD(TAG, "[%d] [%s] ESP_GATTC_OPEN_EVT in IDLE state (status=%d), ignoring", this->connection_index_,
                 this->address_str_, param->open.status);
        break;
      }
 
      if (this->state() != espbt::ClientState::CONNECTING) {
        // This should not happen but lets log it in case it does
        // because it means we have a bad assumption about how the
        // ESP BT stack works.
        ESP_LOGE(TAG, "[%d] [%s] ESP_GATTC_OPEN_EVT in %s state (status=%d)", this->connection_index_,
                 this->address_str_, espbt::client_state_to_string(this->state()), param->open.status);
      }
      if (param->open.status != ESP_GATT_OK && param->open.status != ESP_GATT_ALREADY_OPEN) {
        this->log_gattc_warning_("Connection open", param->open.status);
        // Connection was never established so CLOSE_EVT may not follow
        this->set_idle_();
        break;
      }
      if (this->want_disconnect_) {
        // Disconnect was requested after connecting started,
        // but before the connection was established. Now that we have
        // this->conn_id_ set, we can disconnect it.
        // Don't reset conn_id_ here — CLOSE_EVT needs it to match and call set_idle_().
        this->unconditional_disconnect();
        break;
      }
      // MTU negotiation already started in ESP_GATTC_CONNECT_EVT
      this->set_state(espbt::ClientState::CONNECTED);
      ESP_LOGI(TAG, "[%d] [%s] Connection open", this->connection_index_, this->address_str_);
      if (this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE) {
        // Cached connections already connected with medium parameters, no update needed
        // only set our state, subclients might have more stuff to do yet.
        this->set_state_internal_(espbt::ClientState::ESTABLISHED);
        break;
      }
      // For V3_WITHOUT_CACHE, we already set fast params before connecting
      // No need to update them again here
      this->log_event_("Searching for services");
      esp_ble_gattc_search_service(esp_gattc_if, param->open.conn_id, nullptr);
      break;
    }
    case ESP_GATTC_CONNECT_EVT: {
      if (!this->check_addr(param->connect.remote_bda))
        return false;
      this->log_gattc_lifecycle_event_("CONNECT");
      this->conn_id_ = param->connect.conn_id;
      // Start MTU negotiation immediately as recommended by ESP-IDF examples
      // (gatt_client, ble_throughput) which call esp_ble_gattc_send_mtu_req in
      // ESP_GATTC_CONNECT_EVT instead of waiting for ESP_GATTC_OPEN_EVT.
      // This saves ~3ms in the connection process.
      auto ret = esp_ble_gattc_send_mtu_req(this->gattc_if_, param->connect.conn_id);
      if (ret) {
        this->log_gattc_warning_("esp_ble_gattc_send_mtu_req", ret);
      }
      break;
    }
    case ESP_GATTC_DISCONNECT_EVT: {
      if (!this->check_addr(param->disconnect.remote_bda))
        return false;
      // Check if we were disconnected while waiting for service discovery
      if (param->disconnect.reason == ESP_GATT_CONN_TERMINATE_PEER_USER &&
          this->state() == espbt::ClientState::CONNECTED) {
        this->log_warning_("Remote closed during discovery");
      } else {
        ESP_LOGD(TAG, "[%d] [%s] ESP_GATTC_DISCONNECT_EVT, reason 0x%02x", this->connection_index_, this->address_str_,
                 param->disconnect.reason);
      }
      // For active disconnects (esp_ble_gattc_close), CLOSE_EVT arrives before
      // DISCONNECT_EVT. If CLOSE_EVT already transitioned us to IDLE, don't go
      // backwards to DISCONNECTING — the connection is already fully cleaned up.
      if (this->state() == espbt::ClientState::IDLE) {
        this->log_event_("DISCONNECT_EVT after CLOSE_EVT, already IDLE");
        break;
      }
      // For passive disconnects (remote device disconnected or link lost),
      // DISCONNECT_EVT arrives first. Don't transition to IDLE yet — wait for
      // CLOSE_EVT to ensure the controller has fully freed resources (L2CAP
      // channels, ATT resources, HCI connection handle). Transitioning to IDLE
      // here would allow reconnection before cleanup is complete, causing the
      // controller to reject the new connection (status=133) or crash with
      // ASSERT_PARAM in lld_evt.c.
      this->release_services();
      this->set_disconnecting_();
      break;
    }
 
    case ESP_GATTC_CFG_MTU_EVT: {
      if (this->conn_id_ != param->cfg_mtu.conn_id)
        return false;
      if (param->cfg_mtu.status != ESP_GATT_OK) {
        ESP_LOGW(TAG, "[%d] [%s] cfg_mtu failed, mtu %d, status %d", this->connection_index_, this->address_str_,
                 param->cfg_mtu.mtu, param->cfg_mtu.status);
        // No state change required here - disconnect event will follow if needed.
        break;
      }
      ESP_LOGD(TAG, "[%d] [%s] cfg_mtu status %d, mtu %d", this->connection_index_, this->address_str_,
               param->cfg_mtu.status, param->cfg_mtu.mtu);
      this->mtu_ = param->cfg_mtu.mtu;
      break;
    }
    case ESP_GATTC_CLOSE_EVT: {
      if (this->conn_id_ != param->close.conn_id)
        return false;
      this->log_gattc_lifecycle_event_("CLOSE");
      this->release_services();
      this->set_idle_();
      this->on_disconnect_complete(param->close.reason);
      break;
    }
    case ESP_GATTC_SEARCH_RES_EVT: {
      if (this->conn_id_ != param->search_res.conn_id)
        return false;
      this->service_count_++;
      if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
        // V3 clients don't need services initialized since
        // as they use the ESP APIs to get services.
        break;
      }
#ifdef USE_ESP32_BLE_DEVICE
      BLEService *ble_service = new BLEService();  // NOLINT(cppcoreguidelines-owning-memory)
      ble_service->uuid = espbt::ESPBTUUID::from_uuid(param->search_res.srvc_id.uuid);
      ble_service->start_handle = param->search_res.start_handle;
      ble_service->end_handle = param->search_res.end_handle;
      ble_service->client = this;
      this->services_.push_back(ble_service);
#endif
      break;
    }
    case ESP_GATTC_SEARCH_CMPL_EVT: {
      if (this->conn_id_ != param->search_cmpl.conn_id)
        return false;
      this->log_gattc_lifecycle_event_("SEARCH_CMPL");
      // For V3_WITHOUT_CACHE, switch back to medium connection parameters after service discovery
      // This balances performance with bandwidth usage after the critical discovery phase
      if (this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
        this->update_conn_params_(MEDIUM_MIN_CONN_INTERVAL, MEDIUM_MAX_CONN_INTERVAL, 0, MEDIUM_CONN_TIMEOUT, "medium");
      } else if (this->connection_type_ != espbt::ConnectionType::V3_WITH_CACHE) {
#ifdef USE_ESP32_BLE_DEVICE
#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
        for (auto &svc : this->services_) {
          char uuid_buf[espbt::UUID_STR_LEN];
          svc->uuid.to_str(uuid_buf);
          ESP_LOGV(TAG, "[%d] [%s] Service UUID: %s", this->connection_index_, this->address_str_, uuid_buf);
          ESP_LOGV(TAG, "[%d] [%s]  start_handle: 0x%x  end_handle: 0x%x", this->connection_index_, this->address_str_,
                   svc->start_handle, svc->end_handle);
        }
#endif
#endif
      }
      ESP_LOGI(TAG, "[%d] [%s] Service discovery complete", this->connection_index_, this->address_str_);
      this->set_state_internal_(espbt::ClientState::ESTABLISHED);
      break;
    }
    case ESP_GATTC_READ_DESCR_EVT: {
      if (this->conn_id_ != param->write.conn_id)
        return false;
      this->log_gattc_data_event_("READ_DESCR");
      break;
    }
    case ESP_GATTC_WRITE_DESCR_EVT: {
      if (this->conn_id_ != param->write.conn_id)
        return false;
      this->log_gattc_data_event_("WRITE_DESCR");
      break;
    }
    case ESP_GATTC_WRITE_CHAR_EVT: {
      if (this->conn_id_ != param->write.conn_id)
        return false;
      this->log_gattc_data_event_("WRITE_CHAR");
      break;
    }
    case ESP_GATTC_READ_CHAR_EVT: {
      if (this->conn_id_ != param->read.conn_id)
        return false;
      this->log_gattc_data_event_("READ_CHAR");
      break;
    }
    case ESP_GATTC_NOTIFY_EVT: {
      if (this->conn_id_ != param->notify.conn_id)
        return false;
      this->log_gattc_data_event_("NOTIFY");
      break;
    }
    case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
      this->log_gattc_data_event_("REG_FOR_NOTIFY");
      // The event carries no conn_id, so this is the only place the request can be retired.
      if (this->pending_notify_regs_ > 0)
        this->pending_notify_regs_--;
      if (this->connection_type_ == espbt::ConnectionType::V3_WITH_CACHE ||
          this->connection_type_ == espbt::ConnectionType::V3_WITHOUT_CACHE) {
        // Client is responsible for flipping the descriptor value
        // when using the cache
        break;
      }
      if (this->services_released_) {
        // The lookup below walks the freed GATT cache, and Bluedroid asserts on it rather than erroring.
        this->log_warning_("REG_FOR_NOTIFY after services released, notifications not enabled");
        break;
      }
      esp_gattc_descr_elem_t desc_result;
      uint16_t count = 1;
      esp_gatt_status_t descr_status = esp_ble_gattc_get_descr_by_char_handle(
          this->gattc_if_, this->conn_id_, param->reg_for_notify.handle, NOTIFY_DESC_UUID, &desc_result, &count);
      if (descr_status != ESP_GATT_OK) {
        this->log_gattc_warning_("esp_ble_gattc_get_descr_by_char_handle", descr_status);
        break;
      }
      esp_gattc_char_elem_t char_result;
      esp_gatt_status_t char_status =
          esp_ble_gattc_get_all_char(this->gattc_if_, this->conn_id_, param->reg_for_notify.handle,
                                     param->reg_for_notify.handle, &char_result, &count, 0);
      if (char_status != ESP_GATT_OK) {
        this->log_gattc_warning_("esp_ble_gattc_get_all_char", char_status);
        break;
      }
 
      /*
        1 = notify
        2 = indicate
      */
      uint16_t notify_en = char_result.properties & ESP_GATT_CHAR_PROP_BIT_NOTIFY ? 1 : 2;
      esp_err_t status =
          esp_ble_gattc_write_char_descr(this->gattc_if_, this->conn_id_, desc_result.handle, sizeof(notify_en),
                                         (uint8_t *) &notify_en, ESP_GATT_WRITE_TYPE_RSP, ESP_GATT_AUTH_REQ_NONE);
      ESP_LOGV(TAG, "Wrote notify descriptor %d, properties=%d", notify_en, char_result.properties);
      if (status) {
        this->log_gattc_warning_("esp_ble_gattc_write_char_descr", status);
      }
      break;
    }
 
    case ESP_GATTC_UNREG_FOR_NOTIFY_EVT: {
      this->log_gattc_data_event_("UNREG_FOR_NOTIFY");
      break;
    }
 
    default:
      // Unknown events logged at VERBOSE to avoid UART delays during time-sensitive operations
      ESP_LOGV(TAG, "[%d] [%s] Event %d", this->connection_index_, this->address_str_, event);
      break;
  }
  return true;
}
 
// clients can't call defer() directly since it's protected.
void BLEClientBase::run_later(std::function<void()> &&f) {  // NOLINT
  this->defer(std::move(f));
}
 
void BLEClientBase::gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param) {
  switch (event) {
    // This event is sent by the server when it requests security
    case ESP_GAP_BLE_SEC_REQ_EVT:
      if (!this->check_addr(param->ble_security.auth_cmpl.bd_addr))
        return;
      ESP_LOGV(TAG, "[%d] [%s] ESP_GAP_BLE_SEC_REQ_EVT %x", this->connection_index_, this->address_str_, event);
      esp_ble_gap_security_rsp(param->ble_security.ble_req.bd_addr, true);
      break;
    // This event is sent once authentication has completed
    case ESP_GAP_BLE_AUTH_CMPL_EVT:
      if (!this->check_addr(param->ble_security.auth_cmpl.bd_addr))
        return;
      char addr_str[MAC_ADDRESS_PRETTY_BUFFER_SIZE];
      format_mac_addr_upper(param->ble_security.auth_cmpl.bd_addr, addr_str);
      ESP_LOGI(TAG, "[%d] [%s] auth complete addr: %s", this->connection_index_, this->address_str_, addr_str);
      if (!param->ble_security.auth_cmpl.success) {
        this->log_error_("auth fail reason", param->ble_security.auth_cmpl.fail_reason);
      } else {
        this->paired_ = true;
        ESP_LOGD(TAG, "[%d] [%s] auth success type = %d mode = %d", this->connection_index_, this->address_str_,
                 param->ble_security.auth_cmpl.addr_type, param->ble_security.auth_cmpl.auth_mode);
      }
      break;
 
    // There are other events we'll want to implement at some point to support things like pass key
    // https://github.com/espressif/esp-idf/blob/cba69dd088344ed9d26739f04736ae7a37541b3a/examples/bluetooth/bluedroid/ble/gatt_security_client/tutorial/Gatt_Security_Client_Example_Walkthrough.md
    default:
      break;
  }
}
 
// Parse GATT values into a float for a sensor.
// Ref: https://www.bluetooth.com/specifications/assigned-numbers/format-types/
float BLEClientBase::parse_char_value(uint8_t *value, uint16_t length) {
  // A length of one means a single octet value.
  if (length == 0)
    return 0;
  if (length == 1)
    return (float) ((uint8_t) value[0]);
 
  switch (value[0]) {
    case 0x1:  // boolean.
    case 0x2:  // 2bit.
    case 0x3:  // nibble.
    case 0x4:  // uint8.
      return (float) ((uint8_t) value[1]);
    case 0x5:  // uint12.
    case 0x6:  // uint16.
      if (length > 2) {
        return (float) encode_uint16(value[1], value[2]);
      }
      [[fallthrough]];
    case 0x7:  // uint24.
      if (length > 3) {
        return (float) encode_uint24(value[1], value[2], value[3]);
      }
      [[fallthrough]];
    case 0x8:  // uint32.
      if (length > 4) {
        return (float) encode_uint32(value[1], value[2], value[3], value[4]);
      }
      [[fallthrough]];
    case 0xC:  // int8.
      return (float) ((int8_t) value[1]);
    case 0xD:  // int12.
    case 0xE:  // int16.
      if (length > 2) {
        return (float) ((int16_t) (value[1] << 8) + (int16_t) value[2]);
      }
      [[fallthrough]];
    case 0xF:  // int24.
      if (length > 3) {
        return (float) ((int32_t) (value[1] << 16) + (int32_t) (value[2] << 8) + (int32_t) (value[3]));
      }
      [[fallthrough]];
    case 0x10:  // int32.
      if (length > 4) {
        return (float) ((int32_t) (value[1] << 24) + (int32_t) (value[2] << 16) + (int32_t) (value[3] << 8) +
                        (int32_t) (value[4]));
      }
  }
  ESP_LOGW(TAG, "[%d] [%s] Cannot parse characteristic value of type 0x%x length %d", this->connection_index_,
           this->address_str_, value[0], length);
  return NAN;
}
 
#ifdef USE_ESP32_BLE_DEVICE
BLEService *BLEClientBase::get_service(espbt::ESPBTUUID uuid) {
  for (auto *svc : this->services_) {
    if (svc->uuid == uuid)
      return svc;
  }
  return nullptr;
}
 
BLEService *BLEClientBase::get_service(uint16_t uuid) { return this->get_service(espbt::ESPBTUUID::from_uint16(uuid)); }
 
BLECharacteristic *BLEClientBase::get_characteristic(espbt::ESPBTUUID service, espbt::ESPBTUUID chr) {
  auto *svc = this->get_service(service);
  if (svc == nullptr)
    return nullptr;
  return svc->get_characteristic(chr);
}
 
BLECharacteristic *BLEClientBase::get_characteristic(uint16_t service, uint16_t chr) {
  return this->get_characteristic(espbt::ESPBTUUID::from_uint16(service), espbt::ESPBTUUID::from_uint16(chr));
}
 
BLECharacteristic *BLEClientBase::get_characteristic(uint16_t handle) {
  for (auto *svc : this->services_) {
    if (!svc->parsed)
      svc->parse_characteristics();
    for (auto *chr : svc->characteristics) {
      if (chr->handle == handle)
        return chr;
    }
  }
  return nullptr;
}
 
BLEDescriptor *BLEClientBase::get_config_descriptor(uint16_t handle) {
  auto *chr = this->get_characteristic(handle);
  if (chr != nullptr) {
    if (!chr->parsed)
      chr->parse_descriptors();
    for (auto &desc : chr->descriptors) {
      if (desc->uuid.get_uuid().uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG)
        return desc;
    }
  }
  return nullptr;
}
 
BLEDescriptor *BLEClientBase::get_descriptor(espbt::ESPBTUUID service, espbt::ESPBTUUID chr, espbt::ESPBTUUID descr) {
  auto *svc = this->get_service(service);
  if (svc == nullptr)
    return nullptr;
  auto *ch = svc->get_characteristic(chr);
  if (ch == nullptr)
    return nullptr;
  return ch->get_descriptor(descr);
}
 
BLEDescriptor *BLEClientBase::get_descriptor(uint16_t service, uint16_t chr, uint16_t descr) {
  return this->get_descriptor(espbt::ESPBTUUID::from_uint16(service), espbt::ESPBTUUID::from_uint16(chr),
                              espbt::ESPBTUUID::from_uint16(descr));
}
 
BLEDescriptor *BLEClientBase::get_descriptor(uint16_t handle) {
  for (auto *svc : this->services_) {
    if (!svc->parsed)
      svc->parse_characteristics();
    for (auto *chr : svc->characteristics) {
      if (!chr->parsed)
        chr->parse_descriptors();
      for (auto *desc : chr->descriptors) {
        if (desc->handle == handle)
          return desc;
      }
    }
  }
  return nullptr;
}
#endif  // USE_ESP32_BLE_DEVICE
 
}  // namespace esphome::esp32_ble_client
 
#endif  // USE_ESP32