Mbed OS Reference | BLETypes.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_TYPES_H_
 #define BLE_TYPES_H_
 
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
 
 #include "platform/Span.h"
 
 #include "ble/common/SafeEnum.h"
 #include "ble/gap/Types.h"
 
 /**
  * @addtogroup ble
  * @{
  * @addtogroup common
  * @{
  */
 
 namespace ble {
 
 using mbed::Span;
 using mbed::make_Span;
 using mbed::make_const_Span;
 
 /** Special advertising set handle used for the legacy advertising set. */
 static const advertising_handle_t LEGACY_ADVERTISING_HANDLE = 0x00;
 
 /** Special advertising set handle used as return or parameter to signify an invalid handle. */
 static const advertising_handle_t INVALID_ADVERTISING_HANDLE = 0xFF;
 
 /** Maximum advertising data length that can fit in a legacy PDU. */
 static const uint8_t LEGACY_ADVERTISING_MAX_SIZE = 0x1F;
 
 /** Features supported by the controller.
  * @see BLUETOOTH SPECIFICATION Version 5.0 | Vol 6, Part B - 4.6 */
 struct controller_supported_features_t : SafeEnum<controller_supported_features_t, uint8_t> {
     enum type {
         LE_ENCRYPTION = 0,
         CONNECTION_PARAMETERS_REQUEST_PROCEDURE,
         EXTENDED_REJECT_INDICATION,
         SLAVE_INITIATED_FEATURES_EXCHANGE,
         LE_PING,
         LE_DATA_PACKET_LENGTH_EXTENSION,
         LL_PRIVACY,
         EXTENDED_SCANNER_FILTER_POLICIES,
         LE_2M_PHY,
         STABLE_MODULATION_INDEX_TRANSMITTER,
         STABLE_MODULATION_INDEX_RECEIVER,
         LE_CODED_PHY,
         LE_EXTENDED_ADVERTISING,
         LE_PERIODIC_ADVERTISING,
         CHANNEL_SELECTION_ALGORITHM_2,
         LE_POWER_CLASS
     };
 
     /**
      * Construct a new instance of ControllerSupportedFeatures_t.
      */
     controller_supported_features_t(type value) : SafeEnum(value) { }
 };
 
 /**
  * Opaque reference to a connection.
  *
  * Internally a connection handle is an unsigned integer capable of holding a
  * pointer.
  *
  * The real type (either a pointer to an object or an integer) is opaque for
  * users and platform dependent.
  */
 typedef uintptr_t connection_handle_t;
 
 /**
  * Reference to an attribute in a GATT database.
  */
 typedef uint16_t attribute_handle_t;
 
  /**
   * Inclusive range of GATT attributes handles.
   *
   * @note Instances can be constructed with the help of the factory function
   * attribute_handle_range().
   */
 struct attribute_handle_range_t {
     /**
      * Beginning of the range.
      */
     attribute_handle_t begin;
 
     /**
      * End of the range.
      */
     attribute_handle_t end;
 
     /**
      * Equal operator for attribute_handle_range_t.
      *
      * @param[in] lhs Left hand side of the expression.
      * @param[in] rhs Right hand side of the expression.
      *
      * @return true if lhs is equal to rhs and false otherwise.
      */
     friend bool operator==(
         const attribute_handle_range_t &lhs, const attribute_handle_range_t &rhs
     ) {
         return (lhs.begin == rhs.begin) && (lhs.end == rhs.end);
     }
 
     /**
      * Not equal operator for attribute_handle_range_t.
      *
      * @param[in] lhs Left hand side of the expression.
      * @param[in] rhs Right hand side of the expression.
      *
      * @return true if lhs is not equal to rhs and false otherwise.
      */
     friend bool operator!=(
         const attribute_handle_range_t &lhs, const attribute_handle_range_t &rhs
     ) {
         return !(lhs == rhs);
     }
 };
 
 
 /**
  * Construct an attribute_handle_range_t from its first and last attribute handle.
  *
  * @param[in] begin Handle at the beginning of the range.
  * @param[in] end Handle at the end of the range.
  *
  * @return An instance of attribute_handle_range_t where
  * attribute_handle_range_t::begin is equal to begin and
  * attribute_handle_range_t::end is equal to end.
  *
  * @note This function is defined instead of a constructor to keep "POD-ness"
  * of attribute_handle_range_t.
  */
 static inline attribute_handle_range_t attribute_handle_range(
     attribute_handle_t begin,
     attribute_handle_t end
 )
 {
     attribute_handle_range_t result = {
         begin,
         end
     };
     return result;
 }
 
 /**
  * Type that describes link's encryption state.
  */
 struct link_encryption_t : SafeEnum<link_encryption_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         NOT_ENCRYPTED,          /**< The link is not secured. */
         ENCRYPTION_IN_PROGRESS, /**< Link security is being established. */
         ENCRYPTED,              /**< The link is secure. */
         ENCRYPTED_WITH_MITM,    /**< The link is secure and authenticated. */
         ENCRYPTED_WITH_SC_AND_MITM  /**< The link is secure and authenticated with a secure connection key. */
     };
 
     /**
      * Construct a new instance of link_encryption_t.
      */
     link_encryption_t(type value) : SafeEnum<link_encryption_t, uint8_t>(value) { }
 };
 
 /**
  * Type that describe a pairing failure.
  */
 struct pairing_failure_t : SafeEnum<pairing_failure_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         PASSKEY_ENTRY_FAILED = 0x01,
         OOB_NOT_AVAILABLE = 0x02,
         AUTHENTICATION_REQUIREMENTS = 0x03,
         CONFIRM_VALUE_FAILED = 0x04,
         PAIRING_NOT_SUPPORTED = 0x05,
         ENCRYPTION_KEY_SIZE = 0x06,
         COMMAND_NOT_SUPPORTED = 0x07,
         UNSPECIFIED_REASON = 0x08,
         REPEATED_ATTEMPTS = 0x09,
         INVALID_PARAMETERS = 0x0A,
         DHKEY_CHECK_FAILED = 0x0B,
         NUMERIC_COMPARISON_FAILED = 0x0c,
         BR_EDR_PAIRING_IN_PROGRESS = 0x0D,
         CROSS_TRANSPORT_KEY_DERIVATION_OR_GENERATION_NOT_ALLOWED = 0x0E
     };
 
     /**
      * Construct a new instance of pairing_failure_t.
      */
     pairing_failure_t(type value) : SafeEnum<pairing_failure_t, uint8_t>(value) { }
 };
 
 
 /**
  * Type that describe the IO capability of a device; it is used during Pairing
  * Feature exchange.
  */
 struct io_capability_t : SafeEnum<io_capability_t, uint8_t> {
     enum type {
         DISPLAY_ONLY = 0x00,
         DISPLAY_YES_NO = 0x01,
         KEYBOARD_ONLY = 0x02,
         NO_INPUT_NO_OUTPUT = 0x03,
         KEYBOARD_DISPLAY = 0x04
     };
 
     /**
      * Construct a new instance of io_capability_t.
      */
     io_capability_t(type value) : SafeEnum<io_capability_t, uint8_t>(value) { }
 };
 
 /**
  * Passkey stored as a number.
  */
 typedef uint32_t passkey_num_t;
 
 /**
  * Passkey stored as a string of digits.
  */
 class PasskeyAscii {
 public:
     static const uint8_t PASSKEY_LEN = 6;
     static const uint8_t NUMBER_OFFSET = '0';
 
     /**
      * Default to all zeroes
      */
     PasskeyAscii() {
         memset(ascii, NUMBER_OFFSET, PASSKEY_LEN);
     }
 
     /**
      * Initialize a data from a string.
      *
      * @param[in] passkey value of the data.
      */
     PasskeyAscii(const uint8_t* passkey) {
         if (passkey) {
             memcpy(ascii, passkey, PASSKEY_LEN);
         } else {
             memset(ascii, NUMBER_OFFSET, PASSKEY_LEN);
         }
     }
 
     /**
      * Initialize a data from a number.
      *
      * @param[in] passkey value of the data.
      */
     PasskeyAscii(passkey_num_t passkey) {
 #if BLE_PASSKEY_DISPLAY_REVERSED_DIGITS_DEPRECATION
         for (int i = 5, m = 100000; i >= 0; --i, m /= 10) {
 #else
         for (int i = 0, m = 100000; i < PASSKEY_LEN; ++i, m /= 10) {
 #endif //BLE_PASSKEY_DISPLAY_REVERSED_DIGITS_DEPRECATION
             uint32_t result = passkey / m;
             ascii[i] = NUMBER_OFFSET + result;
             passkey -= result * m;
         }
     }
 
     /**
      * Cast to number.
      */
     operator passkey_num_t() {
         return to_num(ascii);
     }
 
     /**
      * Convert ASCII string of digits into a number.
      * @param[in] ascii ASCII string of 6 digits stored as ASCII characters
      * @return Passkey as a number.
      */
     static uint32_t to_num(const uint8_t *ascii) {
         uint32_t passkey = 0;
         for (size_t i = 0, m = 1; i < PASSKEY_LEN; ++i, m *= 10) {
             passkey += (ascii[i] - NUMBER_OFFSET) * m;
         }
         return passkey;
     }
 
     /**
      * Return the pointer to the buffer holding the string.
      */
     uint8_t* value() {
         return ascii;
     }
 private:
     uint8_t ascii[PASSKEY_LEN];
 };
 
 /**
  * Returns true if every byte is equal to zero
  */
 template <class byte_array_class>
 bool is_all_zeros(byte_array_class &byte_array)
 {
     for (size_t i = 0; i < byte_array.size(); i++) {
         if (byte_array[i] != 0) {
             return false;
         }
     }
     return true;
 }
 
 /**
  * Zero out all bytes
  */
 template <class byte_array_class>
 void set_all_zeros(byte_array_class &byte_array)
 {
     memset(&byte_array[0], 0x00, byte_array.size());
 }
 
 /**
  * Model fixed size array values.
  * @tparam array_size The size of the array.
  */
 template <size_t array_size>
 struct byte_array_t {
     /**
      * Size of the array; accessible at compile time.
      */
     static const size_t size_ = array_size;
 
     /**
      * Default to all zeroes
      */
     byte_array_t() {
         memset(_value, 0x00, sizeof(_value));
     }
 
     /**
      * Initialize a data from an array of bytes.
      *
      * @param[in] input_value value of the data.
      */
     byte_array_t(const uint8_t *input_value) {
         memcpy(_value, input_value, sizeof(_value));
     }
 
     /**
      * Initialize a data from an buffer of bytes.
      *
      * @param[in] input_value pointer to buffer.
      * @param[in] size buffer size
      */
     byte_array_t(const uint8_t* input_value, size_t size) {
         memcpy(_value, input_value, size);
     }
 
     /**
      * Equal operator between two octet types.
      */
     friend bool operator==(const byte_array_t& lhs, const byte_array_t& rhs) {
         return memcmp(lhs._value, rhs._value, sizeof(lhs._value)) == 0;
     }
 
     /**
      * Non equal operator between two octet types.
      */
     friend bool operator!=(const byte_array_t& lhs, const byte_array_t& rhs) {
         return !(lhs == rhs);
     }
 
     /**
      * Subscript operator to access data content
      */
     uint8_t& operator[](size_t i) {
         return _value[i];
     }
 
     /**
      * Subscript operator to access data content
      */
     uint8_t operator[](size_t i) const {
         return _value[i];
     }
 
     /**
      * Return the pointer to the buffer holding data.
      */
     const uint8_t* data() const {
         return _value;
     }
 
     /**
      * Return the pointer to the buffer holding data.
      */
     uint8_t* data() {
         return _value;
     }
 
     /**
      * Size in byte of a data.
      */
     static size_t size() {
         return array_size;
     }
 
 protected:
     uint8_t _value[array_size];
 };
 
 /**
  * Construct a fixed size Span from a byte_array_t.
  *
  * @param src byte_array_t to create a Span from.
  *
  * @return A Span to @p src.
  */
 template<size_t Size>
 Span<uint8_t, Size> make_Span(byte_array_t<Size>& src)
 {
     return Span<uint8_t, Size>(src.data(), src.size());
 }
 
 /**
  * Construct a fixed size Span from a const byte_array_t.
  *
  * @param src byte_array_t to create a Span from.
  *
  * @return A Span to @p src.
  */
 template<size_t Size>
 Span<const uint8_t, Size> make_const_Span(const byte_array_t<Size>& src)
 {
     return Span<const uint8_t, Size>(src.data(), src.size());
 }
 
 /** 128 bit keys used by paired devices */
 typedef byte_array_t<16> irk_t;
 typedef byte_array_t<16> csrk_t;
 typedef byte_array_t<16> ltk_t;
 
 /** Used to identify LTK for legacy pairing connections */
 typedef byte_array_t<2> ediv_t;
 typedef byte_array_t<8> rand_t;
 
 /** Out of band data exchanged during pairing */
 typedef byte_array_t<16> oob_tk_t; /**< legacy pairing TK */
 typedef byte_array_t<16> oob_lesc_value_t; /**< secure connections oob random 128 value */
 typedef byte_array_t<16> oob_confirm_t; /**< secure connections oob confirmation value */
 
 /** data to be encrypted */
 typedef byte_array_t<16> encryption_block_t;
 
 /** public key coordinate, two of which define the public key */
 typedef byte_array_t<32> public_key_coord_t;
 
 /** Diffie-Hellman key */
 typedef byte_array_t<32> dhkey_t;
 
 /** counter for signed data writes done by GattClient */
 typedef uint32_t sign_count_t;
 
 /**
  * MAC address data type.
  */
 struct address_t : public byte_array_t<6> {
     /**
      * Create an invalid mac address, equal to 00:00:00:00:00:00
      */
     address_t() {
         memset(_value, 0x00, sizeof(_value));
     }
 
     /**
      * Initialize a data from an array of bytes.
      *
      * @param[in] input_value value of the data.
      */
     address_t(const uint8_t *input_value) {
         memcpy(_value, input_value, sizeof(_value));
     }
 };
 
 /**
  * Type that describes a random device address type.
  */
 struct random_address_type_t : SafeEnum<random_address_type_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         STATIC, /**< Random static device address. */
         NON_RESOLVABLE_PRIVATE, /**< Random non resolvable private address. */
         RESOLVABLE_PRIVATE /**< Random resolvable private address. */
     };
 
     /**
      * Construct a new instance of random_address_type_t.
      */
     random_address_type_t(type value) :
         SafeEnum<random_address_type_t, uint8_t>(value) { }
 };
 
 /**
  * Security requirement that can be attached to an attribute operation.
  */
 struct att_security_requirement_t : SafeEnum<att_security_requirement_t, uint8_t> {
     /**
      * Number of bits required to store the value.
      *
      * This value can be used to define a bitfield that host a value of this
      * enum.
      */
     static const uint8_t size = 2;
 
     /** struct scoped enum wrapped by the class */
     enum type {
         /**
          * The operation does not have security requirements.
          *
          * It is equivalent to: SecurityMode 1 level 1: No authentication, no
          * encryption and no signing required.
          *
          * @note This security mode is not applicable for signed operation.
          *
          * @note Equivalent to SecurityManager::SECURITY_MODE_ENCRYPTION_OPEN_LINK.
          */
         NONE,
 
         /**
          * The operation requires security and there's no requirement towards
          * peer authentication.
          *
          * @note Security can be achieved either by signing messages or
          * encrypting the link.
          *
          * @note Signing is only applicable for signed write operations.
          *
          * @note Equivalent to SecurityManager::SECURITY_MODE_ENCRYPTION_NO_MITM
          * or SecurityManager::SECURITY_MODE_SIGNED_NO_MITM.
          */
         UNAUTHENTICATED,
 
         /**
          * The operation requires security and the peer must be authenticated.
          *
          * @note Security can be achieved either by signing messages or
          * encrypting the link.
          *
          * @note Equivalent to SecurityManager::SECURITY_MODE_ENCRYPTION_WITH_MITM
          * or SecurityManager::SECURITY_MODE_SIGNED_WITH_MITM.
          */
         AUTHENTICATED,
 
         /**
          * The operation require encryption with an authenticated peer that
          * paired using secure connection pairing.
          *
          * @note This security mode is not applicable for signed operation;
          * security is achieved with link encryption.
          */
         SC_AUTHENTICATED
     };
 
     /**
      * Construct a new instance of att_security_requirement_t.
      */
     att_security_requirement_t(type value) :
         SafeEnum<att_security_requirement_t, uint8_t>(value) { }
 };
 
 /**
  * Type that describes a peer device address type.
  */
 struct peer_address_type_t :SafeEnum<peer_address_type_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         /**
          * Public device address.
          */
         PUBLIC = 0,
 
         /**
          * Random address.
          *
          * Use Gap::getRandomAddressType to retrieve the type of the random
          * address.
          */
         RANDOM,
 
         /**
          * A Public address used as a device identity address.
          */
         PUBLIC_IDENTITY,
 
         /**
          * A Random static address used as a device identity address.
          */
         RANDOM_STATIC_IDENTITY,
 
         /**
          * No address provided (anonymous advertisement).
          */
         ANONYMOUS = 0xFF
     };
 
     /**
      * Construct a new instance of peer_address_type_t.
      */
     peer_address_type_t(type value) :
         SafeEnum<peer_address_type_t, uint8_t>(value) { }
 
     /**
      * Default initialization of peer_address_type_t.
      */
     peer_address_type_t() :
         SafeEnum<peer_address_type_t, uint8_t>(PUBLIC) { }
 };
 
 /**
  * Type that describes a bluetooth PHY(sical) transport.
  */
 struct phy_t : SafeEnum<phy_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         /**
          * No phy selected.
          *
          * @note This value can be used to indicate the absence of phy
          */
         NONE = 0,
 
         /**
          * 1Mbit/s LE.
          *
          * @note This physical transport was available since Bluetooth 4.0
          */
         LE_1M = 1,
 
         /**
          * 2Mbit/s LE.
          *
          * Modulation is similar to LE_1M but differs in rate. Therefore range
          * performances are in the same ballpark as LE_1M while the increased rate
          * minimize time spent to transfer or receive a packet which leads to a
          * better power consumption and/or faster transfer.
          *
          * @note This transport has been introduced with the Bluetooth 5.
          * @note When operating at 2Mbit/s range is not exactly identical to the
          * range at 1Mbit/s due to a loss in sensitivity.
          */
         LE_2M = 2,
 
         /**
          * LE Coded PHY.
          *
          * This transport reuse the 1Mbit/s channel with different coding schemes.
          * Either two (S=2) or eight (S=8) symbols can be used to represent a
          * bit while the 1Mbit/s transport use 1 symbol to code 1 bit of data.
          *
          * Here is the data rate of the two coding schemes:
          *   - S=2: 500kbit/s
          *   - S=8: 125kbit/s
          *
          * The goal of the coded PHY is to increase the range of BLE devices.
          * Of course given it takes more time to transfer data, transmission
          * and reception last longer which leads to an increase in power
          * consumption.
          *
          * @note This transport has been introduced with the Bluetooth 5.
          */
         LE_CODED
     };
 
     /**
      * Construct a new instance of phy_t.
      */
     phy_t(type value) :
         SafeEnum<phy_t, uint8_t>(value) { }
 
     explicit phy_t(uint8_t raw_value) : SafeEnum(raw_value) { }
 };
 
 /**
  * Type that describe a set of PHY(sical) transports. This is used to
  * indicate preference for the PHY transports set within it.
  */
 class phy_set_t {
 public:
     enum PhysFlags_t {
         PHY_SET_1M    = 0x01,
         PHY_SET_2M    = 0x02,
         PHY_SET_CODED = 0x04
     };
 
     /**
      * Create set that indicates no preference.
      */
     phy_set_t() : _value(0) { }
 
     /**
      * Create a set based on the mask specified in the Bluetooth spec.
      *
      * @param value Octet containing the set of preferred PHYs
      */
     phy_set_t(uint8_t value) : _value(value) { }
 
     /**
      * Create a set based on individual settings.
      *
      * @param phy_1m Prefer LE 1M
      * @param phy_2m Prefer LE 2M if avaiable
      * @param phy_coded Prefer coded modulation if avaiable
      */
     phy_set_t(bool phy_1m, bool phy_2m, bool phy_coded) :
         _value()
     {
         set_1m(phy_1m);
         set_2m(phy_2m);
         set_coded(phy_coded);
     }
 
     /**
      * Create a set from a single phy.
      *
      * @param phy The phy to add to the set.
      */
     phy_set_t(phy_t phy) : _value()
     {
         switch (phy.value()) {
             case phy_t::LE_1M:
                 set_1m(true);
                 break;
             case phy_t::LE_2M:
                 set_2m(true);
                 break;
             case phy_t::LE_CODED:
                 set_coded(true);
                 break;
             default:
                 break;
         }
     }
 
     /** Prefer 1M PHY. */
     void set_1m(bool enabled = true) {
         if (enabled) {
             _value |= PHY_SET_1M;
         } else {
             _value &= ~PHY_SET_1M;
         }
     }
 
     /** Prefer 2M PHY. */
     void set_2m(bool enabled = true) {
         if (enabled) {
             _value |= PHY_SET_2M;
         } else {
             _value &= ~PHY_SET_2M;
         }
     }
 
     /** Prefer coded PHY. */
     void set_coded(bool enabled = true) {
         if (enabled) {
             _value |= PHY_SET_CODED;
         } else {
             _value &= ~PHY_SET_CODED;
         }
     }
 
     bool get_1m() const {
         return (_value & PHY_SET_1M);
     }
 
     bool get_2m() const {
         return (_value & PHY_SET_2M);
     }
 
     bool get_coded() const {
         return (_value & PHY_SET_CODED);
     }
 
     operator uint8_t() const {
         return _value;
     }
 
     uint8_t value() const {
         return _value;
     }
 
     uint8_t count() const {
         return (get_1m() ? 1 : 0) + (get_2m() ? 1 : 0) + (get_coded() ? 1 : 0);
     }
 
 private:
     uint8_t _value;
 };
 
 /**
  * Type describing the number of symbols per bit in le coded PHY.
  */
 struct coded_symbol_per_bit_t :SafeEnum<coded_symbol_per_bit_t, uint8_t> {
     /** struct scoped enum wrapped by the class */
     enum type {
         /**
          * The Number of symbol used to code a bit is undefined.
          */
         UNDEFINED,
 
         /**
          * Two symbols to code a bit.
          */
         S2,
 
         /**
          * Eight symbols to code a bit.
          */
         S8
     };
 
     /**
      * Construct a new instance of coded_symbol_per_bit_t.
      */
     coded_symbol_per_bit_t(type value) :
         SafeEnum<coded_symbol_per_bit_t, uint8_t>(value) { }
 };
 
 
 /**
  * Representation of a whitelist of addresses.
  */
 struct whitelist_t {
         /**
      * BLE address representation.
      *
      * It contains an address-type (peer_address_type_t) and the address value
      * (address_t).
      */
     struct entry_t {
         /**
          * Construct an entry_t object with the supplied type and address.
          *
          * @param[in] typeIn The peer address type.
          * @param[in] addressIn The peer address.
          *
          * @post type is equal to typeIn and address is equal to the content
          * present in addressIn.
          */
         entry_t(peer_address_type_t typeIn, const address_t &addressIn) :
             type(typeIn),
             address(addressIn)
         { }
 
         /**
          * Empty constructor.
          *
          * @note The address constructed with the empty constructor is not
          * valid.
          *
          * @post type is equal to PUBLIC and the address value is equal to
          * 00:00:00:00:00:00
          */
         entry_t() : type(), address() { }
 
         /**
          * Type of the peer address.
          */
         peer_address_type_t  type;
 
         /**
          * Value of the peer address.
          */
         address_t address;
     };
 
     /**
         * Pointer to the array of the addresses composing the whitelist.
         */
     entry_t *addresses;
 
     /**
         * Number addresses in this whitelist.
         */
     uint8_t size;
 
     /**
         * Capacity of the array holding the addresses.
         */
     uint8_t capacity;
 };
 
 /** events sent and received when passkey is being entered */
 enum Keypress_t {
     KEYPRESS_STARTED,   /**< Passkey entry started */
     KEYPRESS_ENTERED,   /**< Passkey digit entered */
     KEYPRESS_ERASED,    /**< Passkey digit erased */
     KEYPRESS_CLEARED,   /**< Passkey cleared */
     KEYPRESS_COMPLETED, /**< Passkey entry completed */
 };
 
 } // namespace ble
 
 /**
  * @}
  * @}
  */
 
 #endif /* BLE_TYPES_H_ */
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