Mbed OS Reference | Types.h Source File

 /* mbed Microcontroller Library
  * Copyright (c) 2006-2020 ARM Limited
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * 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.
  */
 
 #ifndef BLE_GAP_TYPES_H
 #define BLE_GAP_TYPES_H
 
 #include "ble/common/Duration.h"
 #include "ble/common/Bounded.h"
 #include "ble/common/SafeEnum.h"
 
 namespace ble {
 
 /**
  * @addtogroup ble
  * @{
  * @addtogroup gap
  * @{
  */
 
 /* BLE units, using microseconds as the common denominator */
 
 /**
  * Time interval between two advertisements.
  *
  * The duration is in unit of 625µs and ranges from 0x20 to 0xFFFFFF .
  *
  * @note before Bluetooth 5 range was 0x20 to 0xFFFF.
  */
 typedef Duration<uint32_t, 625, Range<0x20, 0xFFFFFF> > adv_interval_t;
 
 /**
  * Advertising process duration.
  *
  * The duration is in unit of 10ms and ranges from 0x0001 to 0xFFFF. The special
  * value 0x0000 means the advertising process never ends; it is accessible with
  * adv_duration_t::forever().
  */
 typedef Duration<uint16_t, 10000, Range<0x00, 0xFFFF>, /* forever */ Value<uint16_t, 0x0000> > adv_duration_t;
 
 /**
  * Scan process duration.
  *
  * The duration is in unit of 10ms and ranges from 0x0001 to 0xFFFF. The special
  * value 0x0000 means the scan process never ends; it is accessible with
  * scan_duration_t::forever().
  */
 typedef Duration<uint16_t, 10000, Range<0x00, 0xFFFF>, /* forever */ Value<uint16_t, 0x0000> > scan_duration_t;
 
 /**
  * Time interval between two scan processes.
  *
  * The duration is in unit of 1.28s and ranges from 0x0001 to 0xFFFF. The special
  * value 0x0000 is used to indicate that scan_period_t is not used.
  */
 typedef Duration<uint16_t, 1280000, Range<0x00, 0xFFFF> > scan_period_t;
 
 /**
  * Time interval between two scans.
  *
  * The duration is in unit of 625µs and ranges from 0x04 to 0xFFFF.
  */
 typedef Duration<uint16_t, 625, Range<0x04, 0xFFFF> > scan_interval_t;
 
 /**
  * Duration of a scan.
  *
  * The duration is in unit of 625µs and ranges from 0x04 to 0xFFFF.
  */
 typedef Duration<uint16_t, 625, Range<0x04, 0xFFFF> > scan_window_t;
 
 /**
  * Time interval between two connection events.
  *
  * The interval is in unit of 1.250 milliseconds and ranges from 0x06 to 0xC80.
  */
 typedef Duration<uint16_t, 1250, Range<0x06, 0x0C80> > conn_interval_t;
 
 /**
  * Time after which a connection is loss of devices have not exchanged data.
  *
  * The duration is in unit of 10 milliseconds and ranges from 0x0A to 0xC80.
  *
  * @note this time should be no larger than (1 + ConnLatency) * ConnIntervalMax * 2
  */
 typedef Duration<uint16_t, 10000, Range<0x0A, 0x0C80> > supervision_timeout_t;
 
 /**
  * Duration of a connection event.
  *
  * The duration is in unit of 625µs and ranges from 0x0 to 0xFFFF .
  */
 typedef Duration<uint16_t, 625, Range<0, 0xFFFF> > conn_event_length_t;
 
 /**
  * Time after which a periodic sync link is considered lost if the receiver hasn't
  * received anything from the advertiser.
  *
  * The duration is in unit of 10 milliseconds and ranges from 0x0A to 0x4000.
  */
 typedef Duration<uint16_t, 10000, Range<0x0A, 0x4000> > sync_timeout_t;
 
 /**
  * Interval between two periodic advertising events.
  *
  * The duration is in unit of 1.250ms and ranges from 0x06 to 0xFFFF.
  */
 typedef Duration<uint16_t, 1250, Range<0x06, 0xFFFF> > periodic_interval_t;
 
 /**
  * Number of connection events that can be skipped by the slave.
  *
  * It ranges from 0 to 0x1F3.
  */
 typedef Bounded<uint16_t, 0, 0x01F3> slave_latency_t;
 
 /**
  * Handle of an advertising set.
  *
  * @note Range of valid handle is comprised between 0x00 and 0xEF.
  */
 typedef uint8_t advertising_handle_t;
 
 /**
  * Handle of a sync representing a periodic advertiser.
  *
  * @note Range of valid handle is comprised between 0x0000 and 0xFFFF.
  */
 typedef uint16_t periodic_sync_handle_t;
 
 /**
  * Encapsulates the peripheral advertising modes.
  *
  * It determines how the device appears to other scanner and peripheral
  * devices in the scanning range.
  */
 struct advertising_type_t : SafeEnum<advertising_type_t, uint8_t> {
     /// enumeration of advertising_type_t values
     enum type {
         /**
          * Device is connectable, scannable and doesn't expect connection from a
          * specific peer.
          * @note Cannot carry extended advertising payload, only legacy PDUs.
          * Use CONNECTABLE_NON_SCANNABLE_UNDIRECTED for non-legacy payload.
          *
          * @see Vol 3, Part C, Section 9.3.4 and Vol 6, Part B, Section 2.3.1.1.
          */
         CONNECTABLE_UNDIRECTED = 0x00,
 
         /**
          * Device is connectable and expects connection from a specific peer.
          * (3.75 ms or smaller Advertising Interval)
          * @see Vol 3, Part C, Section 9.3.3 and Vol 6, Part B, Section 2.3.1.2.
          */
         CONNECTABLE_DIRECTED = 0x01,
 
         /**
          * Device is scannable but not connectable.
          *
          * @see Vol 6, Part B, Section 2.3.1.4.
          */
         SCANNABLE_UNDIRECTED = 0x02,
 
         /**
          * Device is not connectable and not scannable.
          *
          * @see Vol 3, Part C, Section 9.3.2 and Vol 6, Part B, Section 2.3.1.3.
          */
         NON_CONNECTABLE_UNDIRECTED = 0x03,
 
         /**
          * Device is connectable and expects connection from a specific peer (sent at long user set intervals).
          */
         CONNECTABLE_DIRECTED_LOW_DUTY = 0x04,
 
         /**
          * Device is connectable, but not scannable and doesn't expect connection from a specific peer.
          * @note Only for use with extended advertising payload, will not allow legacy PDUs
          * (use CONNECTABLE_UNDIRECTED for legacy PDU).
          */
         CONNECTABLE_NON_SCANNABLE_UNDIRECTED = 0x05,
 
 #if !defined(DOXYGEN_ONLY)
         // used by the PAL; naming in line with the the spec.
         ADV_IND = 0x00,
         ADV_DIRECT_IND = 0x01,
         ADV_SCAN_IND = 0x02,
         ADV_NONCONN_IND = 0x03,
         ADV_DIRECT_IND_LOW_DUTY_CYCLE = 0x04,
         ADV_NONSCAN_IND = 0x05
 #endif
     };
 
     /**
      * Construct a new advertising_type_t value.
      *
      * @param value The value of the advertising_type_t created.
      */
     advertising_type_t(type value) : SafeEnum(value)
     {
     }
 };
 
 
 /** Used to indicate if the packet is complete and if it's truncated.
  */
 struct advertising_data_status_t : SafeEnum<advertising_data_status_t, uint8_t> {
     /// enumeration of advertising_data_status_t values
     enum type {
         COMPLETE = 0x00, /// Advertising payload complete.
         INCOMPLETE_MORE_DATA = 0x01, /// Partial advertising payload, more to come.
         INCOMPLETE_DATA_TRUNCATED = 0x02 /// Advertising payload incomplete, and no more is coming.
     };
 
     /**
      * Construct a new advertising_data_status_t value.
      *
      * @param value The value of the advertising_data_status_t created.
      */
     advertising_data_status_t(type value) : SafeEnum(value)
     {
     }
 
 #if !defined(DOXYGEN_ONLY)
 
     /**
      * Explicit constructor from a raw value.
      */
     explicit advertising_data_status_t(uint8_t raw_value) :
         SafeEnum(raw_value)
     {
     }
 
 #endif
 
 };
 
 /** Properties of an advertising event.
  */
 struct advertising_event_t {
 
 private:
     // Implementation note: The object is constructed from the field Event_Type
     // of an LE Extended Advertising.
     // Indexes and functions of bits are defined in BLUETOOTH SPECIFICATION
     // Version 5.0 | Vol 2, Part E -
     // Section 7.7.65.13 LE Extended Advertising report Event
     enum {
         CONNECTABLE_BIT = 0,
         SCANNABLE_ADVERTISING_BIT = 1,
         DIRECTED_ADVERTISING_BIT = 2,
         SCAN_RESPONSE_BIT = 3,
         LEGACY_PDU_BIT = 4,
         DATA_STATUS_INDEX = 5,
         DATA_STATUS_MASK = 0x03
     };
 
 public:
 
 #if !defined(DOXYGEN_ONLY)
 
     /** Create based on a raw value.
      *
      * @param value
      */
     explicit advertising_event_t(uint8_t value) : value(value)
     {
     }
 
 #endif
 
     /** Is advertising connectable.
      *
      * @return True if connectable.
      */
     bool connectable() const
     {
         return static_cast<bool>(value & (1 << CONNECTABLE_BIT));
     }
 
     /** Is advertising scannable.
      *
      * @return True if scannable
      */
     bool scannable_advertising() const
     {
         return static_cast<bool>(value & (1 << SCANNABLE_ADVERTISING_BIT));
     }
 
     /** Is advertising directed.
      *
      * @return True if directed.
      */
     bool directed_advertising() const
     {
         return static_cast<bool>(value & (1 << DIRECTED_ADVERTISING_BIT));
     }
 
     /** Is this a scan response.
      *
      * @return True if scan response.
      */
     bool scan_response() const
     {
         return static_cast<bool>(value & (1 << SCAN_RESPONSE_BIT));
     }
 
     /** Is this legacy advertising.
      *
      * @return True if legacy.
      */
     bool legacy_advertising() const
     {
         return static_cast<bool>(value & (1 << LEGACY_PDU_BIT));
     }
 
     /** Payload completeness status.
      *
      * @return @see advertising_data_status_t for details.
      */
     advertising_data_status_t data_status() const
     {
         return static_cast<advertising_data_status_t::type>(
             (value >> DATA_STATUS_INDEX) & DATA_STATUS_MASK
         );
     }
 
     /** Is payload complete.
      *
      * @return True if payload is coplete.
      */
     bool complete() const
     {
         return data_status() == advertising_data_status_t::COMPLETE;
     }
 
     /** Is there more data coming.
      *
      * @return True if more data coming.
      */
     bool more_data_to_come() const
     {
         return data_status() == advertising_data_status_t::INCOMPLETE_MORE_DATA;
     }
 
     /** Is the payload truncated.
      *
      * @return True if no more data coming.
      */
     bool truncated() const
     {
         return data_status() == advertising_data_status_t::INCOMPLETE_DATA_TRUNCATED;
     }
 
 private:
     uint8_t value;
 };
 
 /**
  * Identify an advertising SID. Range: [0x00, 0x0F]
  */
 typedef uint8_t advertising_sid_t;
 
 /** Received signal strength. Range <-127, 20>.
  *  @note Special value 127 means RSSI is not available. */
 typedef int8_t rssi_t;
 
 /**
  * Describe the advertising power.
  *
  * Values between -127 and +126 are considered power values in dBm while
  * the special value 127 can be used as a wildcard to indicate that the host
  * has no preference or if the power information is not available.
  */
 typedef int8_t advertising_power_t;
 
 /**
  * Advertising policy filter modes.
  *
  * @see Bluetooth Core Specification 4.2 (Vol. 6), Part B, Section 4.3.2.
  */
 struct advertising_filter_policy_t : SafeEnum<advertising_filter_policy_t, uint8_t> {
     /// enumeration of advertising_filter_policy_t values
     enum type {
         /**
          * Process connection and scan requests from all devices. The whitelist is
          * not used.
          */
         NO_FILTER = 0x00,
 
         /**
          * Process connection requests from all devices but filter out scan requests
          * of devices that are not in the whitelist.
          */
         FILTER_SCAN_REQUESTS = 0x01,
 
         /**
          * Process scan requests from all devices but filter out connection requests
          * of devices that are not in the whitelist.
          */
         FILTER_CONNECTION_REQUEST = 0x02,
 
         /**
          * Filter out scan or connection requests of devices that are not in the
          * whitelist.
          */
         FILTER_SCAN_AND_CONNECTION_REQUESTS = 0x03
     };
 
     /**
      * Construct a advertising_filter_policy_t.
      * @param value The value of the advertising_filter_policy_t created.
      */
     advertising_filter_policy_t(type value) : SafeEnum(value)
     {
     }
 };
 
 /**
  * Scanning policy filter mode.
  *
  * @see Bluetooth Core Specification 4.2 (Vol. 6), Part B, Section 4.3.3.
  */
 struct scanning_filter_policy_t : SafeEnum<scanning_filter_policy_t, uint8_t> {
     /// enumeration of scanning_filter_policy_t values
     enum type {
         /**
         * Accept all advertising packets except directed advertising packets not
         * addressed to this device.
         */
         NO_FILTER = 0x00,
 
         /**
         * Accept only advertising packets from devices in the whitelist except
         * directed advertising packets not addressed to this device.
         */
         FILTER_ADVERTISING = 0x01,
 
         /**
          * Accept all advertising packets except directed advertising packets
          * where the initiator's identity address does not address this device.
          *
          * @note Directed advertising packets where the initiator's address is a
          * resolvable private address that cannot be resolved are also accepted.
          */
         NO_FILTER_INCLUDE_UNRESOLVABLE_DIRECTED = 2,
 
         /**
          * Accept all advertising packets except:
          * - Advertising packets where the advertiser's
          * identity address is not in the whitelist.
          * - Directed advertising packets where the initiator's identity address
          * does not address this device.
          *
          * @note Directed advertising packets where the initiator's address is a
          * resolvable private address that cannot be resolved are also accepted.
          */
         FILTER_ADVERTISING_INCLUDE_UNRESOLVABLE_DIRECTED = 3
     };
 
     /**
      * Construct a new instance of scanning_filter_policy_t.
      *
      * @param value The value of the scanning_filter_policy_t created.
      */
     scanning_filter_policy_t(type value) : SafeEnum(value)
     {
     }
 };
 
 /**
  * Filter policy that you can use during connection initiation.
  */
 struct initiator_filter_policy_t : SafeEnum<initiator_filter_policy_t, uint8_t> {
     /// enumeration of initiator_filter_policy_t values.
     enum type {
         /**
         * The whitelist is not used to determine which advertiser to connect to.
         */
         NO_FILTER,
 
         /**
         * The whitelist is used to determine which advertiser to connect to.
         */
         USE_WHITE_LIST
     };
 
     /**
      * Construct a initiator_filter_policy_t.
      * @param value The value of the initiator_filter_policy_t.
      */
     initiator_filter_policy_t(type value) : SafeEnum(value)
     {
     }
 };
 
 /**
  * Scanning policy filter mode.
  *
  * @see Bluetooth Core Specification 4.2 (Vol. 6), Part B, Section 4.3.3.
  */
 struct duplicates_filter_t : SafeEnum<duplicates_filter_t, uint8_t> {
     /// enumeration of duplicates_filter_t values
     enum type {
         /**
          * Disable duplicate filtering.
          */
         DISABLE,
 
         /**
          * Enable duplicate filtering.
          */
         ENABLE,
 
         /**
          * Enable duplicate filtering, and reset the cache periodically.
          */
         PERIODIC_RESET
     };
 
     /**
      * Construct a new duplicates_filter_t value.
      * @param value The value of the duplicates_filter_t created.
      */
     duplicates_filter_t(type value) : SafeEnum(value)
     {
     }
 };
 
 /**
  * Type used to model the own address used during the following GAP operations:
  * advertising, scanning and initiating
  */
 struct own_address_type_t : SafeEnum<own_address_type_t, uint8_t> {
     /// enumeration of own_address_type_t values.
     enum type {
         /**
          * Use the public device address.
          */
         PUBLIC = 0x00,
 
         /**
          * Use the random device address.
          */
         RANDOM = 0x01,
 
         /**
          * Generated resolvable private address based on the local IRK from the
          * resolving list. Use the public address if no entry match in the resolving
          * list.
          */
         RESOLVABLE_PRIVATE_ADDRESS_PUBLIC_FALLBACK = 0x02,
 
         /**
          * Generated resolvable private address based on the local IRK from the
          * resolving list. Use the random address if no entry match in the resolving
          * list.
          */
         RESOLVABLE_PRIVATE_ADDRESS_RANDOM_FALLBACK = 0x03,
     };
 
     /**
      * Construct a new instance of own_address_type_t.
      * @param value The value of the own_address_type_t created.
      */
     own_address_type_t(type value) : SafeEnum(value)
     {
     }
 
     /**
      * Default initialization of own_address_type_t.
      */
     own_address_type_t() :
         SafeEnum<own_address_type_t, uint8_t>(PUBLIC) { }
 };
 
 /**
  * Type of an address to connect to.
  *
  * It is used to connect to a device directly with directed advertising.
  */
 struct target_peer_address_type_t : SafeEnum<target_peer_address_type_t, uint8_t> {
     /// enumeration of target_peer_address_type_t values.
     enum type {
         PUBLIC = 0x00, /**< Public Device Address or Public Identity Address. */
         RANDOM = 0x01, /**< Random Device Address or Random (static) Identity Address. */
     };
 
     /**
      * Create a new target_peer_address_type_t.
      * @param value The value of the target_peer_address_type_t created.
      */
     target_peer_address_type_t(type value) : SafeEnum(value)
     {
     }
 };
 
 /**
  * Accuracy of the master clock.
  */
 struct clock_accuracy_t : SafeEnum<clock_accuracy_t, uint8_t> {
     /// enumeration of clock_accuracy_t values.
     enum type {
         /**
          * 500 PPM
          */
         PPM_500 = 0x00,
 
         /**
          * 250 PPM
          */
         PPM_250 = 0x01,
 
         /**
          * 150 PPM
          */
         PPM_150 = 0x02,
 
         /**
          * 100 PPM
          */
         PPM_100 = 0x03,
 
         /**
          * 75 PPM
          */
         PPM_75 = 0x04,
 
         /**
          * 50 PPM
          */
         PPM_50 = 0x05,
 
         /**
          * 30 PPM
          */
         PPM_30 = 0x06,
 
         /**
          * 20 PPM
          */
         PPM_20 = 0x07
     };
 
     /** Get clock accuracy.
      *
      * @return Parts per million as a number.
      */
     uint16_t get_ppm()
     {
         switch (value()) {
             case PPM_500:
                 return 500;
             case PPM_250:
                 return 250;
             case PPM_150:
                 return 150;
             case PPM_100:
                 return 100;
             case PPM_75:
                 return 75;
             case PPM_50:
                 return 50;
             case PPM_30:
                 return 30;
             case PPM_20:
                 return 20;
             default:
                 return 0;
         }
     }
 
     /**
      * Construct a new clock_accuracy_t value.
      * @param value The value of the clock_accuracy_t created.
      */
     clock_accuracy_t(type value) : SafeEnum(value)
     {
     }
 
 #if !defined(DOXYGEN_ONLY)
 
     /**
      * Construct a new clock_accuracy_t value from a raw value.
      * @param raw_value The value of the clock accuracy.
      */
     explicit clock_accuracy_t(uint8_t raw_value) : SafeEnum(raw_value)
     {
     }
 
 #endif
 };
 
 /**
  * Enumeration of GAP roles.
  *
  * @note The BLE API does not express the broadcaster and scanner roles.
  *
  * @attention A device can fulfill different roles concurrently.
  */
 struct connection_role_t : SafeEnum<connection_role_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         /**
          * Central Role.
          *
          * The device can scan and initiate connection to peripherals. It
          * acts as the master when a connection is established.
          *
          * @note A central is a scanner.
          */
         CENTRAL = 0x00,
 
         /**
          * Peripheral Role.
          *
          * The device can advertise, and you can connect it by a central. It
          * acts as a slave when connected.
          *
          * @note A peripheral is a broadcaster.
          */
         PERIPHERAL = 0x01
     };
 
     /**
      * Construct a new instance of role_t.
      *
      * @param value The value of the role_t created.
      */
     connection_role_t(type value) : SafeEnum(value)
     {
     }
 
 #if !defined(DOXYGEN_ONLY)
 
     /**
      * Explicit constructor from a raw value.
      * @param raw_value The role.
      */
     explicit connection_role_t(uint8_t raw_value) : SafeEnum(raw_value)
     {
     }
 
 #endif
 };
 
 /**
  * Enumeration of disconnection reasons that should be transmited to the peer.
  */
 struct local_disconnection_reason_t : SafeEnum<local_disconnection_reason_t, uint8_t> {
     /// enumeration of local_disconnection_reason_t values.
     enum type {
         /**
          * GAP or GATT failed to authenticate the peer.
          */
         AUTHENTICATION_FAILURE = 0x05,
 
         /**
          * Connection terminated by the user.
          */
         USER_TERMINATION = 0x13,
 
         /**
          * Connection termination due to low resources.
          */
         LOW_RESOURCES = 0x14,
 
         /**
          * Connection termination due to power off.
          */
         POWER_OFF = 0x15,
 
         /**
          * Remote feature not supported.
          */
         UNSUPPORTED_REMOTE_FEATURE = 0x1A,
 
         /**
          * Not possible to pai with a unit key.
          */
         PAIRING_WITH_UNIT_KEY_NOT_SUPPORTED = 0x29,
 
         /**
          * Connection parameters were unacceptable.
          */
         UNACCEPTABLE_CONNECTION_PARAMETERS = 0x3B
     };
 
     /**
      * Construct a new instance of disconnection_reason_t.
      *
      * @param value The value of the local_disconnection_reason_t created.
      */
     local_disconnection_reason_t(type value) : SafeEnum(value)
     {
     }
 };
 
 
 /**
  * Enumeration of disconnection reasons received in a disconnection event.
  */
 struct disconnection_reason_t : SafeEnum<disconnection_reason_t, uint8_t> {
     /// enumeration of disconnection_reason_t values.
     enum type {
         /**
          * GAP or GATT failed to authenticate the peer.
          */
         AUTHENTICATION_FAILURE = 0x05,
 
         /**
          * The connection timed out.
          */
         CONNECTION_TIMEOUT = 0x08,
 
         /**
          * Connection terminated by the user.
          */
         REMOTE_USER_TERMINATED_CONNECTION = 0x13,
 
         /**
          * Remote device terminated connection due to low resources.
          */
         REMOTE_DEV_TERMINATION_DUE_TO_LOW_RESOURCES = 0x14,
 
         /**
          * Remote device terminated connection due to power off.
          */
         REMOTE_DEV_TERMINATION_DUE_TO_POWER_OFF = 0x15,
 
         /**
          * Indicate that the local user or the internal
          * Bluetooth subsystem terminated the connection.
          */
         LOCAL_HOST_TERMINATED_CONNECTION = 0x16,
 
         /**
          * Connection parameters were unacceptable.
          */
         UNACCEPTABLE_CONNECTION_PARAMETERS = 0x3B
     };
 
     /**
      * Construct a new instance of disconnection_reason_t.
      *
      * @param value The value of the disconnection_reason_t created.
      */
     disconnection_reason_t(type value) : SafeEnum(value)
     {
     }
 
 #if !defined(DOXYGEN_ONLY)
     /**
      * Construct a new instance of disconnection_reason_t.
      *
      * @param value The value of the local_disconnection_reason_t created.
      *
      * @note This should only be used for casting raw values from HCI.
      */
     explicit disconnection_reason_t(uint8_t value) : SafeEnum(value)
     {
     }
 };
 #endif // !defined(DOXYGEN_ONLY)
 
 /**
  * Privacy Configuration of the peripheral role.
  *
  * @note This configuration also applies to the broadcaster role configuration.
  */
 struct peripheral_privacy_configuration_t {
     /**
      * Indicates if nonresolvable random address should be used when the
      * peripheral advertises nonconnectable packets.
      *
      * Resolvable random address continues to be used for connectable packets.
      */
     bool use_non_resolvable_random_address;
 
     /**
      * Resolution strategy for initiator resolvable addresses when a
      * connection request is received.
      */
     enum resolution_strategy_t {
         /**
          * Do not resolve the address of the initiator and accept the
          * connection request.
          */
         DO_NOT_RESOLVE,
 
         /**
          * If a bond is present in the secure database and the address
          * resolution fails, then reject the connection request with the error
          * code AUTHENTICATION_FAILLURE.
          */
         REJECT_NON_RESOLVED_ADDRESS,
 
         /**
          * Perform the pairing procedure if the initiator resolvable
          * address failed the resolution process.
          */
         PERFORM_PAIRING_PROCEDURE,
 
         /**
          * Perform the authentication procedure if the initiator resolvable
          * address failed the resolution process.
          */
         PERFORM_AUTHENTICATION_PROCEDURE
     };
 
     /**
      * Connection strategy to use when a connection request contains a
      * private resolvable address.
      */
     resolution_strategy_t resolution_strategy;
 };
 
 /**
  * Privacy configuration of the central role.
  *
  * @note This configuration is also used when the local device operates as
  * an observer.
  */
 struct central_privacy_configuration_t {
     /**
      * Indicates if nonresolvable random address should be used when the
      * central or observer sends scan request packets.
      *
      * Resolvable random address continues to be used for connection requests.
      */
     bool use_non_resolvable_random_address;
 
 
     /**
      * Resolution strategy of resolvable addresses received in advertising
      * packets.
      */
     enum resolution_strategy_t {
         /**
          * Do not resolve the address received in advertising packets.
          */
         DO_NOT_RESOLVE,
 
         /**
          * Resolve the resolvable addresses in the advertising packet and
          * forward advertising packet to the application independently of
          * the address resolution procedure result.
          */
         RESOLVE_AND_FORWARD,
 
         /**
          * Filter out packets containing a resolvable address that cannot be resolved
          * by this device.
          *
          * @note Filtering is applied if the local device contains at least
          * one bond.
          */
         RESOLVE_AND_FILTER
     };
 
     /**
      * Resolution strategy applied to advertising packets received by the
      * local device.
      */
     resolution_strategy_t resolution_strategy;
 };
 
 
 /**
  * @}
  * @}
  */
 
 } // namespace ble
 
 #endif //BLE_GAP_TYPES_H
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