
#ifndef __CONN_H__
#define __CONN_H__

#include "base/bt_common.h"

#include "utils/simple_buf.h"
#include "utils/slist.h"
#include "host\keys.h"

#include "common/addr.h"

#include "common/gap_def.h"
#include "common/bt_err.h"

typedef enum __packed
{
    BT_CONN_DISCONNECTED,
    BT_CONN_DISCONNECT_COMPLETE,
    BT_CONN_CONNECTING_SCAN,
    BT_CONN_CONNECTING_AUTO,
    BT_CONN_CONNECTING_ADV,
    BT_CONN_CONNECTING_DIR_ADV,
    BT_CONN_CONNECTING,
    BT_CONN_CONNECTED,
    BT_CONN_DISCONNECTING,
} bt_conn_state_t;


/** @brief Convert connection interval to milliseconds
 *
 *  Multiply by 1.25 to get milliseconds.
 *
 *  Note that this may be inaccurate, as something like 7.5 ms cannot be
 *  accurately presented with integers.
 */
#define BT_CONN_INTERVAL_TO_MS(interval) ((interval)*5U / 4U)

/** @brief Convert connection interval to microseconds
 *
 *  Multiply by 1250 to get microseconds.
 */
#define BT_CONN_INTERVAL_TO_US(interval) ((interval)*1250U)

/** BR/EDR Connection Info Structure */
struct bt_conn_br_info
{
    const bt_addr_t *dst; /** Destination (Remote) BR/EDR address */
};

enum
{
    BT_CONN_ROLE_CENTRAL = 0,
    BT_CONN_ROLE_PERIPHERAL = 1,
};

enum bt_conn_state
{
    /** Channel disconnected */
    BT_CONN_STATE_DISCONNECTED,
    /** Channel in connecting state */
    BT_CONN_STATE_CONNECTING,
    /** Channel connected and ready for upper layer traffic on it */
    BT_CONN_STATE_CONNECTED,
    /** Channel in disconnecting state */
    BT_CONN_STATE_DISCONNECTING,
};

/** Security level. */
typedef enum __packed
{
    /** Level 0: Only for BR/EDR special cases, like SDP */
    BT_SECURITY_L0,
    /** Level 1: No encryption and no authentication. */
    BT_SECURITY_L1,
    /** Level 2: Encryption and no authentication (no MITM). */
    BT_SECURITY_L2,
    /** Level 3: Encryption and authentication (MITM). */
    BT_SECURITY_L3,
    /** Level 4: Authenticated Secure Connections and 128-bit key. */
    BT_SECURITY_L4,
    /** Bit to force new pairing procedure, bit-wise OR with requested
     *  security level.
     */
    BT_SECURITY_FORCE_PAIR = BIT(7),
} bt_security_t;

/** Security Info Flags. */
enum bt_security_flag
{
    /** Paired with Secure Connections. */
    BT_SECURITY_FLAG_SC = BIT(0),
    /** Paired with Out of Band method. */
    BT_SECURITY_FLAG_OOB = BIT(1),
};

/** Security Info Structure. */
struct bt_security_info
{
    /** Security Level. */
    bt_security_t level;
    /** Encryption Key Size. */
    uint8_t enc_key_size;
    /** Flags. */
    enum bt_security_flag flags;
};



/** Opaque type representing a connection to a remote device */
struct bt_conn;

/** Connection parameters for LE connections */
struct bt_le_conn_param
{
    uint16_t interval_min;
    uint16_t interval_max;
    uint16_t latency;
    uint16_t timeout;
};

/** @brief Initialize connection parameters
 *
 *  @param int_min  Minimum Connection Interval (N * 1.25 ms)
 *  @param int_max  Maximum Connection Interval (N * 1.25 ms)
 *  @param lat      Connection Latency
 *  @param to       Supervision Timeout (N * 10 ms)
 */
#define BT_LE_CONN_PARAM_INIT(int_min, int_max, lat, to)                                           \
    {                                                                                              \
        .interval_min = (int_min), .interval_max = (int_max), .latency = (lat), .timeout = (to),   \
    }

/** Helper to declare connection parameters inline
 *
 *  @param int_min  Minimum Connection Interval (N * 1.25 ms)
 *  @param int_max  Maximum Connection Interval (N * 1.25 ms)
 *  @param lat      Connection Latency
 *  @param to       Supervision Timeout (N * 10 ms)
 */
#define BT_LE_CONN_PARAM(int_min, int_max, lat, to)                                                \
    ((struct bt_le_conn_param[]){BT_LE_CONN_PARAM_INIT(int_min, int_max, lat, to)})

/** Default LE connection parameters:
 *    Connection Interval: 30-50 ms
 *    Latency: 0
 *    Timeout: 4 s
 */
#define BT_LE_CONN_PARAM_DEFAULT                                                                   \
    BT_LE_CONN_PARAM(BT_GAP_INIT_CONN_INT_MIN, BT_GAP_INIT_CONN_INT_MAX, 0, 400)

/** Connection PHY information for LE connections */
struct bt_conn_le_phy_info
{
    uint8_t tx_phy; /** Connection transmit PHY */
    uint8_t rx_phy; /** Connection receive PHY */
};

/** Connection PHY options */
enum
{
    /** Convenience value when no options are specified. */
    BT_CONN_LE_PHY_OPT_NONE = 0,

    /** LE Coded using S=2 coding preferred when transmitting. */
    BT_CONN_LE_PHY_OPT_CODED_S2 = BIT(0),

    /** LE Coded using S=8 coding preferred when transmitting. */
    BT_CONN_LE_PHY_OPT_CODED_S8 = BIT(1),
};

/** Preferred PHY parameters for LE connections */
struct bt_conn_le_phy_param
{
    uint16_t options;    /** Connection PHY options. */
    uint8_t pref_tx_phy; /** Bitmask of preferred transmit PHYs */
    uint8_t pref_rx_phy; /** Bitmask of preferred receive PHYs */
};

/** Initialize PHY parameters
 *
 * @param _pref_tx_phy Bitmask of preferred transmit PHYs.
 * @param _pref_rx_phy Bitmask of preferred receive PHYs.
 */
#define BT_CONN_LE_PHY_PARAM_INIT(_pref_tx_phy, _pref_rx_phy)                                      \
    {                                                                                              \
        .options = BT_CONN_LE_PHY_OPT_NONE, .pref_tx_phy = (_pref_tx_phy),                         \
        .pref_rx_phy = (_pref_rx_phy),                                                             \
    }

/** Helper to declare PHY parameters inline
 *
 * @param _pref_tx_phy Bitmask of preferred transmit PHYs.
 * @param _pref_rx_phy Bitmask of preferred receive PHYs.
 */
#define BT_CONN_LE_PHY_PARAM(_pref_tx_phy, _pref_rx_phy)                                           \
    ((struct bt_conn_le_phy_param[]){BT_CONN_LE_PHY_PARAM_INIT(_pref_tx_phy, _pref_rx_phy)})

/** Only LE 1M PHY */
#define BT_CONN_LE_PHY_PARAM_1M BT_CONN_LE_PHY_PARAM(BT_GAP_LE_PHY_1M, BT_GAP_LE_PHY_1M)

/** Only LE 2M PHY */
#define BT_CONN_LE_PHY_PARAM_2M BT_CONN_LE_PHY_PARAM(BT_GAP_LE_PHY_2M, BT_GAP_LE_PHY_2M)

/** Only LE Coded PHY. */
#define BT_CONN_LE_PHY_PARAM_CODED BT_CONN_LE_PHY_PARAM(BT_GAP_LE_PHY_CODED, BT_GAP_LE_PHY_CODED)

/** All LE PHYs. */
#define BT_CONN_LE_PHY_PARAM_ALL                                                                   \
    BT_CONN_LE_PHY_PARAM(BT_GAP_LE_PHY_1M | BT_GAP_LE_PHY_2M | BT_GAP_LE_PHY_CODED,                \
                         BT_GAP_LE_PHY_1M | BT_GAP_LE_PHY_2M | BT_GAP_LE_PHY_CODED)

/** Connection data length information for LE connections */
struct bt_conn_le_data_len_info
{
    /** Maximum Link Layer transmission payload size in bytes. */
    uint16_t tx_max_len;
    /** Maximum Link Layer transmission payload time in us. */
    uint16_t tx_max_time;
    /** Maximum Link Layer reception payload size in bytes. */
    uint16_t rx_max_len;
    /** Maximum Link Layer reception payload time in us. */
    uint16_t rx_max_time;
};

/** Connection data length parameters for LE connections */
struct bt_conn_le_data_len_param
{
    /** Maximum Link Layer transmission payload size in bytes. */
    uint16_t tx_max_len;
    /** Maximum Link Layer transmission payload time in us. */
    uint16_t tx_max_time;
};

/** Initialize transmit data length parameters
 *
 * @param  _tx_max_len  Maximum Link Layer transmission payload size in bytes.
 * @param  _tx_max_time Maximum Link Layer transmission payload time in us.
 */
#define BT_CONN_LE_DATA_LEN_PARAM_INIT(_tx_max_len, _tx_max_time)                                  \
    {                                                                                              \
        .tx_max_len = (_tx_max_len), .tx_max_time = (_tx_max_time),                                \
    }

/** Helper to declare transmit data length parameters inline
 *
 * @param  _tx_max_len  Maximum Link Layer transmission payload size in bytes.
 * @param  _tx_max_time Maximum Link Layer transmission payload time in us.
 */
#define BT_CONN_LE_DATA_LEN_PARAM(_tx_max_len, _tx_max_time)                                       \
    ((struct bt_conn_le_data_len_param[]){                                                         \
            BT_CONN_LE_DATA_LEN_PARAM_INIT(_tx_max_len, _tx_max_time)})

/** Default LE data length parameters. */
#define BT_LE_DATA_LEN_PARAM_DEFAULT                                                               \
    BT_CONN_LE_DATA_LEN_PARAM(BT_GAP_DATA_LEN_DEFAULT, BT_GAP_DATA_TIME_DEFAULT)

/** Maximum LE data length parameters. */
#define BT_LE_DATA_LEN_PARAM_MAX                                                                   \
    BT_CONN_LE_DATA_LEN_PARAM(BT_GAP_DATA_LEN_MAX, BT_GAP_DATA_TIME_MAX)

struct bt_conn_le
{
    bt_addr_le_t peer;
    bt_addr_le_t dst;

    bt_addr_le_t init_addr;
    bt_addr_le_t resp_addr;

    uint16_t interval;
    uint16_t interval_min;
    uint16_t interval_max;

    uint16_t latency;
    uint16_t timeout;
    uint16_t pending_latency;
    uint16_t pending_timeout;

    uint8_t features[8];

    #if defined(CONFIG_BT_SMP)
    struct bt_keys *keys;
    #endif

    struct bt_conn_le_phy_info phy;

    struct bt_conn_le_data_len_info data_len;
};

struct bt_conn
{
    uint16_t handle;
    uint8_t type;
    uint8_t role;

    /* Which local identity address this connection uses */
    uint8_t id;

    /* Connection error or reason for disconnect */
    uint8_t err;

    bt_conn_state_t state;
    uint16_t rx_len;
    simple_buf_t *rx;

    uint8_t tx_pending;

    /* Queue for outgoing ACL data */
    sys_slist_t tx_queue;

    /* Active L2CAP channels */
    sys_slist_t channels;

    simple_buf_t *tx_acl_buf;
    uint16_t tx_acl_len;

    #if defined(CONFIG_BT_SMP)
	bt_security_t		sec_level;
	bt_security_t		required_sec_level;
	uint8_t			encrypt;
    #endif /* CONFIG_BT_SMP*/

    union
    {
        struct bt_conn_le le;
    };

#if defined(CONFIG_BT_REMOTE_VERSION)
    struct bt_conn_rv
    {
        uint8_t version;
        uint16_t manufacturer;
        uint16_t subversion;
    } rv;
#endif
};








/** @brief Increment a connection's reference count.
 *
 *  Increment the reference count of a connection object.
 *
 *  @note Will return NULL if the reference count is zero.
 *
 *  @param conn Connection object.
 *
 *  @return Connection object with incremented reference count, or NULL if the
 *          reference count is zero.
 */
struct bt_conn *bt_conn_ref(struct bt_conn *conn);

/** @brief Decrement a connection's reference count.
 *
 *  Decrement the reference count of a connection object.
 *
 *  @param conn Connection object.
 */
void bt_conn_unref(struct bt_conn *conn);

/** @brief Iterate through all existing connections.
 *
 * @param type  Connection Type
 * @param func  Function to call for each connection.
 * @param data  Data to pass to the callback function.
 */
void bt_conn_foreach(int type, void (*func)(struct bt_conn *conn, void *data), void *data);

/** @brief Look up an existing connection by address.
 *
 *  Look up an existing connection based on the remote address.
 *
 *  The caller gets a new reference to the connection object which must be
 *  released with bt_conn_unref() once done using the object.
 *
 *  @param id   Local identity (in most cases BT_ID_DEFAULT).
 *  @param peer Remote address.
 *
 *  @return Connection object or NULL if not found.
 */
struct bt_conn *bt_conn_lookup_addr_le(const bt_addr_le_t *peer);

/** @brief Get destination (peer) address of a connection.
 *
 *  @param conn Connection object.
 *
 *  @return Destination address.
 */
const bt_addr_le_t *bt_conn_get_dst(const struct bt_conn *conn);

/** @brief Get array index of a connection
 *
 *  This function is used to map bt_conn to index of an array of
 *  connections. The array has CONFIG_BT_MAX_CONN elements.
 *
 *  @param conn Connection object.
 *
 *  @return Index of the connection object.
 *          The range of the returned value is 0..CONFIG_BT_MAX_CONN-1
 */
uint8_t bt_conn_index(const struct bt_conn *conn);

/** Connection Type */
enum
{
    /** LE Connection Type */
    BT_CONN_TYPE_LE = BIT(0),
    /** BR/EDR Connection Type */
    BT_CONN_TYPE_BR = BIT(1),
    /** SCO Connection Type */
    BT_CONN_TYPE_SCO = BIT(2),
    /** ISO Connection Type */
    BT_CONN_TYPE_ISO = BIT(3),
    /** All Connection Type */
    BT_CONN_TYPE_ALL = BT_CONN_TYPE_LE | BT_CONN_TYPE_BR | BT_CONN_TYPE_SCO | BT_CONN_TYPE_ISO,
};

/** LE Connection Info Structure */
struct bt_conn_le_info
{
    /** Source (Local) Identity Address */
    const bt_addr_le_t *src;
    /** Destination (Remote) Identity Address or remote Resolvable Private
     *  Address (RPA) before identity has been resolved.
     */
    const bt_addr_le_t *dst;
    /** Local device address used during connection setup. */
    const bt_addr_le_t *local;
    /** Remote device address used during connection setup. */
    const bt_addr_le_t *remote;
    uint16_t interval; /** Connection interval */
    uint16_t latency;  /** Connection peripheral latency */
    uint16_t timeout;  /** Connection supervision timeout */

    const struct bt_conn_le_phy_info *phy;

    /* Connection maximum single fragment parameters */
    const struct bt_conn_le_data_len_info *data_len;
};


/** Connection Info Structure */
struct bt_conn_info
{
    /** Connection Type. */
    uint8_t type;
    /** Connection Role. */
    uint8_t role;
    /** Which local identity the connection was created with */
    uint8_t id;
    /** Connection Type specific Info.*/
    union
    {
        /** LE Connection specific Info. */
        struct bt_conn_le_info le;
        /** BR/EDR Connection specific Info. */
        struct bt_conn_br_info br;
    };
    /** Connection state. */
    enum bt_conn_state state;
    /** Security specific info. */
    struct bt_security_info security;
};

/** LE Connection Remote Info Structure */
struct bt_conn_le_remote_info
{

    /** Remote LE feature set (bitmask). */
    const uint8_t *features;
};

/** BR/EDR Connection Remote Info structure */
struct bt_conn_br_remote_info
{

    /** Remote feature set (pages of bitmasks). */
    const uint8_t *features;

    /** Number of pages in the remote feature set. */
    uint8_t num_pages;
};

/** @brief Connection Remote Info Structure
 *
 *  @note The version, manufacturer and subversion fields will only contain
 *        valid data if @kconfig{CONFIG_BT_REMOTE_VERSION} is enabled.
 */
struct bt_conn_remote_info
{
    /** Connection Type */
    uint8_t type;

    /** Remote Link Layer version */
    uint8_t version;

    /** Remote manufacturer identifier */
    uint16_t manufacturer;

    /** Per-manufacturer unique revision */
    uint16_t subversion;

    union
    {
        /** LE connection remote info */
        struct bt_conn_le_remote_info le;

        /** BR/EDR connection remote info */
        struct bt_conn_br_remote_info br;
    };
};

enum bt_conn_le_tx_power_phy
{
    /** Convenience macro for when no PHY is set. */
    BT_CONN_LE_TX_POWER_PHY_NONE,
    /** LE 1M PHY */
    BT_CONN_LE_TX_POWER_PHY_1M,
    /** LE 2M PHY */
    BT_CONN_LE_TX_POWER_PHY_2M,
    /** LE Coded PHY using S=8 coding. */
    BT_CONN_LE_TX_POWER_PHY_CODED_S8,
    /** LE Coded PHY using S=2 coding. */
    BT_CONN_LE_TX_POWER_PHY_CODED_S2,
};

/** LE Transmit Power Level Structure */
struct bt_conn_le_tx_power
{

    /** Input: 1M, 2M, Coded S2 or Coded S8 */
    uint8_t phy;

    /** Output: current transmit power level */
    int8_t current_level;

    /** Output: maximum transmit power level */
    int8_t max_level;
};

/** @brief Get connection info
 *
 *  @param conn Connection object.
 *  @param info Connection info object.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_get_info(const struct bt_conn *conn, struct bt_conn_info *info);

/** @brief Get connection info for the remote device.
 *
 *  @param conn Connection object.
 *  @param remote_info Connection remote info object.
 *
 *  @note In order to retrieve the remote version (version, manufacturer
 *  and subversion) @kconfig{CONFIG_BT_REMOTE_VERSION} must be enabled
 *
 *  @note The remote information is exchanged directly after the connection has
 *  been established. The application can be notified about when the remote
 *  information is available through the remote_info_available callback.
 *
 *  @return Zero on success or (negative) error code on failure.
 *  @return -EBUSY The remote information is not yet available.
 */
int bt_conn_get_remote_info(struct bt_conn *conn, struct bt_conn_remote_info *remote_info);

/** @brief Get connection transmit power level.
 *
 *  @param conn           Connection object.
 *  @param tx_power_level Transmit power level descriptor.
 *
 *  @return Zero on success or (negative) error code on failure.
 *  @return -ENOBUFS HCI command buffer is not available.
 */
int bt_conn_le_get_tx_power_level(struct bt_conn *conn, struct bt_conn_le_tx_power *tx_power_level);

/** @brief Update the connection parameters.
 *
 *  If the local device is in the peripheral role then updating the connection
 *  parameters will be delayed. This delay can be configured by through the
 *  @kconfig{CONFIG_BT_CONN_PARAM_UPDATE_TIMEOUT} option.
 *
 *  @param conn Connection object.
 *  @param param Updated connection parameters.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_le_param_update(struct bt_conn *conn, const struct bt_le_conn_param *param);

/** @brief Update the connection transmit data length parameters.
 *
 *  @param conn  Connection object.
 *  @param param Updated data length parameters.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_le_data_len_update(struct bt_conn *conn, const struct bt_conn_le_data_len_param *param);

/** @brief Update the connection PHY parameters.
 *
 *  Update the preferred transmit and receive PHYs of the connection.
 *  Use @ref BT_GAP_LE_PHY_NONE to indicate no preference.
 *
 *  @param conn Connection object.
 *  @param param Updated connection parameters.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_le_phy_update(struct bt_conn *conn, const struct bt_conn_le_phy_param *param);

/** @brief Disconnect from a remote device or cancel pending connection.
 *
 *  Disconnect an active connection with the specified reason code or cancel
 *  pending outgoing connection.
 *
 *  The disconnect reason for a normal disconnect should be:
 *  @ref BT_ERR_REMOTE_USER_TERM_CONN.
 *
 *  The following disconnect reasons are accepted:
 *   - @ref BT_ERR_AUTH_FAIL
 *   - @ref BT_ERR_REMOTE_USER_TERM_CONN
 *   - @ref BT_ERR_REMOTE_LOW_RESOURCES
 *   - @ref BT_ERR_REMOTE_POWER_OFF
 *   - @ref BT_ERR_UNSUPP_REMOTE_FEATURE
 *   - @ref BT_ERR_PAIRING_NOT_SUPPORTED
 *   - @ref BT_ERR_UNACCEPT_CONN_PARAM
 *
 *  @param conn Connection to disconnect.
 *  @param reason Reason code for the disconnection.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_disconnect(struct bt_conn *conn, uint8_t reason);

enum
{
    /** Convenience value when no options are specified. */
    BT_CONN_LE_OPT_NONE = 0,

    /** @brief Enable LE Coded PHY.
     *
     *  Enable scanning on the LE Coded PHY.
     */
    BT_CONN_LE_OPT_CODED = BIT(0),

    /** @brief Disable LE 1M PHY.
     *
     *  Disable scanning on the LE 1M PHY.
     *
     *  @note Requires @ref BT_CONN_LE_OPT_CODED.
     */
    BT_CONN_LE_OPT_NO_1M = BIT(1),
};

struct bt_conn_le_create_param
{

    /** Bit-field of create connection options. */
    uint32_t options;

    /** Scan interval (N * 0.625 ms) */
    uint16_t interval;

    /** Scan window (N * 0.625 ms) */
    uint16_t window;

    /** @brief Scan interval LE Coded PHY (N * 0.625 MS)
     *
     *  Set zero to use same as LE 1M PHY scan interval
     */
    uint16_t interval_coded;

    /** @brief Scan window LE Coded PHY (N * 0.625 MS)
     *
     *  Set zero to use same as LE 1M PHY scan window.
     */
    uint16_t window_coded;

    /** @brief Connection initiation timeout (N * 10 MS)
     *
     *  Set zero to use the default @kconfig{CONFIG_BT_CREATE_CONN_TIMEOUT}
     *  timeout.
     *
     *  @note Unused in @ref bt_conn_le_create_auto
     */
    uint16_t timeout;
};

/** @brief Initialize create connection parameters
 *
 *  @param _options  Create connection options.
 *  @param _interval Create connection scan interval (N * 0.625 ms).
 *  @param _window   Create connection scan window (N * 0.625 ms).
 */
#define BT_CONN_LE_CREATE_PARAM_INIT(_options, _interval, _window)                                 \
    {                                                                                              \
        .options = (_options), .interval = (_interval), .window = (_window), .interval_coded = 0,  \
        .window_coded = 0, .timeout = 0,                                                           \
    }

/** Helper to declare create connection parameters inline
 *
 *  @param _options  Create connection options.
 *  @param _interval Create connection scan interval (N * 0.625 ms).
 *  @param _window   Create connection scan window (N * 0.625 ms).
 */
#define BT_CONN_LE_CREATE_PARAM(_options, _interval, _window)                                      \
    ((struct bt_conn_le_create_param[]){BT_CONN_LE_CREATE_PARAM_INIT(_options, _interval, _window)})

/** Default LE create connection parameters.
 *  Scan continuously by setting scan interval equal to scan window.
 */
#define BT_CONN_LE_CREATE_CONN                                                                     \
    BT_CONN_LE_CREATE_PARAM(BT_CONN_LE_OPT_NONE, BT_GAP_SCAN_FAST_INTERVAL,                        \
                            BT_GAP_SCAN_FAST_INTERVAL)

/** Default LE create connection using filter accept list parameters.
 *  Scan window:   30 ms.
 *  Scan interval: 60 ms.
 */
#define BT_CONN_LE_CREATE_CONN_AUTO                                                                \
    BT_CONN_LE_CREATE_PARAM(BT_CONN_LE_OPT_NONE, BT_GAP_SCAN_FAST_INTERVAL, BT_GAP_SCAN_FAST_WINDOW)

/** @brief Initiate an LE connection to a remote device.
 *
 *  Allows initiate new LE link to remote peer using its address.
 *
 *  The caller gets a new reference to the connection object which must be
 *  released with bt_conn_unref() once done using the object.
 *
 *  This uses the General Connection Establishment procedure.
 *
 *  The application must disable explicit scanning before initiating
 *  a new LE connection.
 *
 *  @param[in]  peer         Remote address.
 *  @param[in]  create_param Create connection parameters.
 *  @param[in]  conn_param   Initial connection parameters.
 *  @param[out] conn         Valid connection object on success.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_le_create(const bt_addr_le_t *peer, const struct bt_conn_le_create_param *create_param,
                      const struct bt_le_conn_param *conn_param, struct bt_conn **conn);

/** @brief Automatically connect to remote devices in the filter accept list..
 *
 *  This uses the Auto Connection Establishment procedure.
 *  The procedure will continue until a single connection is established or the
 *  procedure is stopped through @ref bt_conn_create_auto_stop.
 *  To establish connections to all devices in the the filter accept list the
 *  procedure should be started again in the connected callback after a
 *  new connection has been established.
 *
 *  @param create_param Create connection parameters
 *  @param conn_param   Initial connection parameters.
 *
 *  @return Zero on success or (negative) error code on failure.
 *  @return -ENOMEM No free connection object available.
 */
int bt_conn_le_create_auto(const struct bt_conn_le_create_param *create_param,
                           const struct bt_le_conn_param *conn_param);

/** @brief Stop automatic connect creation.
 *
 *  @return Zero on success or (negative) error code on failure.
 */
int bt_conn_create_auto_stop(void);

/** @brief Automatically connect to remote device if it's in range.
 *
 *  This function enables/disables automatic connection initiation.
 *  Every time the device loses the connection with peer, this connection
 *  will be re-established if connectable advertisement from peer is received.
 *
 *  @note Auto connect is disabled during explicit scanning.
 *
 *  @param addr Remote Bluetooth address.
 *  @param param If non-NULL, auto connect is enabled with the given
 *  parameters. If NULL, auto connect is disabled.
 *
 *  @return Zero on success or error code otherwise.
 */
int bt_le_set_auto_conn(const bt_addr_le_t *addr, const struct bt_le_conn_param *param);

/** @brief Set security level for a connection.
 *
 *  This function enable security (encryption) for a connection. If the device
 *  has bond information for the peer with sufficiently strong key encryption
 *  will be enabled. If the connection is already encrypted with sufficiently
 *  strong key this function does nothing.
 *
 *  If the device has no bond information for the peer and is not already paired
 *  then the pairing procedure will be initiated. If the device has bond
 *  information or is already paired and the keys are too weak then the pairing
 *  procedure will be initiated.
 *
 *  This function may return error if required level of security is not possible
 *  to achieve due to local or remote device limitation (e.g., input output
 *  capabilities), or if the maximum number of paired devices has been reached.
 *
 *  This function may return error if the pairing procedure has already been
 *  initiated by the local device or the peer device.
 *
 *  @note When @kconfig{CONFIG_BT_SMP_SC_ONLY} is enabled then the security
 *        level will always be level 4.
 *
 *  @note When @kconfig{CONFIG_BT_SMP_OOB_LEGACY_PAIR_ONLY} is enabled then the
 *        security level will always be level 3.
 *
 *  @param conn Connection object.
 *  @param sec Requested security level.
 *
 *  @return 0 on success or negative error
 */
int bt_conn_set_security(struct bt_conn *conn, bt_security_t sec);

/** @brief Get security level for a connection.
 *
 *  @return Connection security level
 */
bt_security_t bt_conn_get_security(const struct bt_conn *conn);

/** @brief Get encryption key size.
 *
 *  This function gets encryption key size.
 *  If there is no security (encryption) enabled 0 will be returned.
 *
 *  @param conn Existing connection object.
 *
 *  @return Encryption key size.
 */
uint8_t bt_conn_enc_key_size(const struct bt_conn *conn);

enum bt_security_err
{
    /** Security procedure successful. */
    BT_SECURITY_ERR_SUCCESS,

    /** Authentication failed. */
    BT_SECURITY_ERR_AUTH_FAIL,

    /** PIN or encryption key is missing. */
    BT_SECURITY_ERR_PIN_OR_KEY_MISSING,

    /** OOB data is not available.  */
    BT_SECURITY_ERR_OOB_NOT_AVAILABLE,

    /** The requested security level could not be reached. */
    BT_SECURITY_ERR_AUTH_REQUIREMENT,

    /** Pairing is not supported */
    BT_SECURITY_ERR_PAIR_NOT_SUPPORTED,

    /** Pairing is not allowed. */
    BT_SECURITY_ERR_PAIR_NOT_ALLOWED,

    /** Invalid parameters. */
    BT_SECURITY_ERR_INVALID_PARAM,

    /** Distributed Key Rejected */
    BT_SECURITY_ERR_KEY_REJECTED,

    /** Pairing failed but the exact reason could not be specified. */
    BT_SECURITY_ERR_UNSPECIFIED,
};

#if defined (CONFIG_BT_SMP)
void bt_conn_security_changed(struct bt_conn *conn, uint8_t hci_err, enum bt_security_err err);
#endif

/** @brief Connection callback structure.
 *
 *  This structure is used for tracking the state of a connection.
 *  It is registered with the help of the bt_conn_cb_register() API.
 *  It's permissible to register multiple instances of this @ref bt_conn_cb
 *  type, in case different modules of an application are interested in
 *  tracking the connection state. If a callback is not of interest for
 *  an instance, it may be set to NULL and will as a consequence not be
 *  used for that instance.
 */
struct bt_conn_cb
{
    /** @brief A new connection has been established.
     *
     *  This callback notifies the application of a new connection.
     *  In case the err parameter is non-zero it means that the
     *  connection establishment failed.
     *
     *  @note If the connection was established from an advertising set then
     *        the advertising set cannot be restarted directly from this
     *        callback. Instead use the connected callback of the
     *        advertising set.
     *
     *  @param conn New connection object.
     *  @param err HCI error. Zero for success, non-zero otherwise.
     *
     *  @p err can mean either of the following:
     *  - @ref BT_ERR_UNKNOWN_CONN_ID Creating the connection started by
     *    @ref bt_conn_le_create was canceled either by the user through
     *    @ref bt_conn_disconnect or by the timeout in the host through
     *    @ref bt_conn_le_create_param timeout parameter, which defaults to
     *    @kconfig{CONFIG_BT_CREATE_CONN_TIMEOUT} seconds.
     *  - @p BT_ERR_ADV_TIMEOUT High duty cycle directed connectable
     *    advertiser started by @ref bt_le_adv_start failed to be connected
     *    within the timeout.
     */
    void (*connected)(struct bt_conn *conn, uint8_t err);

    /** @brief A connection has been disconnected.
     *
     *  This callback notifies the application that a connection
     *  has been disconnected.
     *
     *  When this callback is called the stack still has one reference to
     *  the connection object. If the application in this callback tries to
     *  start either a connectable advertiser or create a new connection
     *  this might fail because there are no free connection objects
     *  available.
     *  To avoid this issue it is recommended to either start connectable
     *  advertise or create a new connection using @ref sys_work_submit or
     *  increase @kconfig{CONFIG_BT_MAX_CONN}.
     *
     *  @param conn Connection object.
     *  @param reason BT_ERR_* reason for the disconnection.
     */
    void (*disconnected)(struct bt_conn *conn, uint8_t reason);

    /** @brief LE connection parameter update request.
     *
     *  This callback notifies the application that a remote device
     *  is requesting to update the connection parameters. The
     *  application accepts the parameters by returning true, or
     *  rejects them by returning false. Before accepting, the
     *  application may also adjust the parameters to better suit
     *  its needs.
     *
     *  It is recommended for an application to have just one of these
     *  callbacks for simplicity. However, if an application registers
     *  multiple it needs to manage the potentially different
     *  requirements for each callback. Each callback gets the
     *  parameters as returned by previous callbacks, i.e. they are not
     *  necessarily the same ones as the remote originally sent.
     *
     *  If the application does not have this callback then the default
     *  is to accept the parameters.
     *
     *  @param conn Connection object.
     *  @param param Proposed connection parameters.
     *
     *  @return true to accept the parameters, or false to reject them.
     */
    bool (*le_param_req)(struct bt_conn *conn, struct bt_le_conn_param *param);

    /** @brief The parameters for an LE connection have been updated.
     *
     *  This callback notifies the application that the connection
     *  parameters for an LE connection have been updated.
     *
     *  @param conn Connection object.
     *  @param interval Connection interval.
     *  @param latency Connection latency.
     *  @param timeout Connection supervision timeout.
     */
    void (*le_param_updated)(struct bt_conn *conn, uint16_t interval, uint16_t latency,
                             uint16_t timeout);
#if defined(CONFIG_BT_SMP)
    /** @brief Remote Identity Address has been resolved.
     *
     *  This callback notifies the application that a remote
     *  Identity Address has been resolved
     *
     *  @param conn Connection object.
     *  @param rpa Resolvable Private Address.
     *  @param identity Identity Address.
     */
    void (*identity_resolved)(struct bt_conn *conn, const bt_addr_le_t *rpa,
                              const bt_addr_le_t *identity);
#endif /* CONFIG_BT_SMP */
#if defined(CONFIG_BT_SMP)
    /** @brief The security level of a connection has changed.
     *
     *  This callback notifies the application that the security of a
     *  connection has changed.
     *
     *  The security level of the connection can either have been increased
     *  or remain unchanged. An increased security level means that the
     *  pairing procedure has been performed or the bond information from
     *  a previous connection has been applied. If the security level
     *  remains unchanged this means that the encryption key has been
     *  refreshed for the connection.
     *
     *  @param conn Connection object.
     *  @param level New security level of the connection.
     *  @param err Security error. Zero for success, non-zero otherwise.
     */
    void (*security_changed)(struct bt_conn *conn, bt_security_t level, enum bt_security_err err);
#endif /* defined(CONFIG_BT_SMP) */

    /** @brief Remote information procedures has completed.
     *
     *  This callback notifies the application that the remote information
     *  has been retrieved from the remote peer.
     *
     *  @param conn Connection object.
     *  @param remote_info Connection information of remote device.
     */
    void (*remote_info_available)(struct bt_conn *conn, struct bt_conn_remote_info *remote_info);

    /** @brief The PHY of the connection has changed.
     *
     *  This callback notifies the application that the PHY of the
     *  connection has changed.
     *
     *  @param conn Connection object.
     *  @param info Connection LE PHY information.
     */
    void (*le_phy_updated)(struct bt_conn *conn, struct bt_conn_le_phy_info *param);

    /** @brief The data length parameters of the connection has changed.
     *
     *  This callback notifies the application that the maximum Link Layer
     *  payload length or transmission time has changed.
     *
     *  @param conn Connection object.
     *  @param info Connection data length information.
     */
    void (*le_data_len_updated)(struct bt_conn *conn, struct bt_conn_le_data_len_info *info);

#if defined(CONFIG_BT_DF_CONNECTION_CTE_RX)
    /** @brief Callback for IQ samples report collected when sampling
     *        CTE received by data channel PDU.
     *
     * @param conn      The connection object.
     * @param iq_report Report data for collected IQ samples.
     */
    void (*cte_report_cb)(struct bt_conn *conn,
                          const struct bt_df_conn_iq_samples_report *iq_report);
#endif /* CONFIG_BT_DF_CONNECTION_CTE_RX */

    struct bt_conn_cb *_next;
};

/** @brief Register connection callbacks.
 *
 *  Register callbacks to monitor the state of connections.
 *
 *  @param cb Callback struct. Must point to memory that remains valid.
 */
void bt_conn_cb_register(struct bt_conn_cb *cb);

/**
 *  @brief Register a callback structure for connection events.
 *
 *  @param _name Name of callback structure.
 */
#define BT_CONN_CB_DEFINE(_name)                                                                   \
    static const struct bt_conn_cb _CONCAT(bt_conn_cb_, _name)

/** @brief Enable/disable bonding.
 *
 *  Set/clear the Bonding flag in the Authentication Requirements of
 *  SMP Pairing Request/Response data.
 *  The initial value of this flag depends on BT_BONDABLE Kconfig setting.
 *  For the vast majority of applications calling this function shouldn't be
 *  needed.
 *
 *  @param enable Value allowing/disallowing to be bondable.
 */
void bt_set_bondable(bool enable);

/**
 *  Special passkey value that can be used to disable a previously
 *  set fixed passkey.
 */
#define BT_PASSKEY_INVALID 0xffffffff

/** @brief Set a fixed passkey to be used for pairing.
 *
 *  This API is only available when the CONFIG_BT_FIXED_PASSKEY
 *  configuration option has been enabled.
 *
 *  Sets a fixed passkey to be used for pairing. If set, the
 *  pairing_confirm() callback will be called for all incoming pairings.
 *
 *  @param passkey A valid passkey (0 - 999999) or BT_PASSKEY_INVALID
 *                 to disable a previously set fixed passkey.
 *
 *  @return 0 on success or a negative error code on failure.
 */
int bt_passkey_set(unsigned int passkey);

/** Info Structure for OOB pairing */
struct bt_conn_oob_info
{
    /** Type of OOB pairing method */
    enum
    {
        /** LE legacy pairing */
        BT_CONN_OOB_LE_LEGACY,

        /** LE SC pairing */
        BT_CONN_OOB_LE_SC,
    } type;

    union
    {
        /** LE Secure Connections OOB pairing parameters */
        struct
        {
            /** OOB data configuration */
            enum
            {
                /** Local OOB data requested */
                BT_CONN_OOB_LOCAL_ONLY,

                /** Remote OOB data requested */
                BT_CONN_OOB_REMOTE_ONLY,

                /** Both local and remote OOB data requested */
                BT_CONN_OOB_BOTH_PEERS,

                /** No OOB data requested */
                BT_CONN_OOB_NO_DATA,
            } oob_config;
        } lesc;
    };
};

#if defined(CONFIG_BT_SMP_APP_PAIRING_ACCEPT)
/** @brief Pairing request and pairing response info structure.
 *
 *  This structure is the same for both smp_pairing_req and smp_pairing_rsp
 *  and a subset of the packet data, except for the initial Code octet.
 *  It is documented in Core Spec. Vol. 3, Part H, 3.5.1 and 3.5.2.
 */
struct bt_conn_pairing_feat
{
    /** IO Capability, Core Spec. Vol 3, Part H, 3.5.1, Table 3.4 */
    uint8_t io_capability;

    /** OOB data flag, Core Spec. Vol 3, Part H, 3.5.1, Table 3.5 */
    uint8_t oob_data_flag;

    /** AuthReq, Core Spec. Vol 3, Part H, 3.5.1, Fig. 3.3 */
    uint8_t auth_req;

    /** Maximum Encryption Key Size, Core Spec. Vol 3, Part H, 3.5.1 */
    uint8_t max_enc_key_size;

    /** Initiator Key Distribution/Generation, Core Spec. Vol 3, Part H,
     *  3.6.1, Fig. 3.11
     */
    uint8_t init_key_dist;

    /** Responder Key Distribution/Generation, Core Spec. Vol 3, Part H
     *  3.6.1, Fig. 3.11
     */
    uint8_t resp_key_dist;
};
#endif /* CONFIG_BT_SMP_APP_PAIRING_ACCEPT */

/** Authenticated pairing callback structure */
struct bt_conn_auth_cb
{
#if defined(CONFIG_BT_SMP_APP_PAIRING_ACCEPT)
    /** @brief Query to proceed incoming pairing or not.
     *
     *  On any incoming pairing req/rsp this callback will be called for
     *  the application to decide whether to allow for the pairing to
     *  continue.
     *
     *  The pairing info received from the peer is passed to assist
     *  making the decision.
     *
     *  As this callback is synchronous the application should return
     *  a response value immediately. Otherwise it may affect the
     *  timing during pairing. Hence, this information should not be
     *  conveyed to the user to take action.
     *
     *  The remaining callbacks are not affected by this, but do notice
     *  that other callbacks can be called during the pairing. Eg. if
     *  pairing_confirm is registered both will be called for Just-Works
     *  pairings.
     *
     *  This callback may be unregistered in which case pairing continues
     *  as if the Kconfig flag was not set.
     *
     *  This callback is not called for BR/EDR Secure Simple Pairing (SSP).
     *
     *  @param conn Connection where pairing is initiated.
     *  @param feat Pairing req/resp info.
     */
    enum bt_security_err (*pairing_accept)(struct bt_conn *conn,
                                           const struct bt_conn_pairing_feat *const feat);
#endif /* CONFIG_BT_SMP_APP_PAIRING_ACCEPT */

    /** @brief Display a passkey to the user.
     *
     *  When called the application is expected to display the given
     *  passkey to the user, with the expectation that the passkey will
     *  then be entered on the peer device. The passkey will be in the
     *  range of 0 - 999999, and is expected to be padded with zeroes so
     *  that six digits are always shown. E.g. the value 37 should be
     *  shown as 000037.
     *
     *  This callback may be set to NULL, which means that the local
     *  device lacks the ability do display a passkey. If set
     *  to non-NULL the cancel callback must also be provided, since
     *  this is the only way the application can find out that it should
     *  stop displaying the passkey.
     *
     *  @param conn Connection where pairing is currently active.
     *  @param passkey Passkey to show to the user.
     */
    void (*passkey_display)(struct bt_conn *conn, unsigned int passkey);

    /** @brief Request the user to enter a passkey.
     *
     *  When called the user is expected to enter a passkey. The passkey
     *  must be in the range of 0 - 999999, and should be expected to
     *  be zero-padded, as that's how the peer device will typically be
     *  showing it (e.g. 37 would be shown as 000037).
     *
     *  Once the user has entered the passkey its value should be given
     *  to the stack using the bt_conn_auth_passkey_entry() API.
     *
     *  This callback may be set to NULL, which means that the local
     *  device lacks the ability to enter a passkey. If set to non-NULL
     *  the cancel callback must also be provided, since this is the
     *  only way the application can find out that it should stop
     *  requesting the user to enter a passkey.
     *
     *  @param conn Connection where pairing is currently active.
     */
    void (*passkey_entry)(struct bt_conn *conn);

    /** @brief Request the user to confirm a passkey.
     *
     *  When called the user is expected to confirm that the given
     *  passkey is also shown on the peer device.. The passkey will
     *  be in the range of 0 - 999999, and should be zero-padded to
     *  always be six digits (e.g. 37 would be shown as 000037).
     *
     *  Once the user has confirmed the passkey to match, the
     *  bt_conn_auth_passkey_confirm() API should be called. If the
     *  user concluded that the passkey doesn't match the
     *  bt_conn_auth_cancel() API should be called.
     *
     *  This callback may be set to NULL, which means that the local
     *  device lacks the ability to confirm a passkey. If set to non-NULL
     *  the cancel callback must also be provided, since this is the
     *  only way the application can find out that it should stop
     *  requesting the user to confirm a passkey.
     *
     *  @param conn Connection where pairing is currently active.
     *  @param passkey Passkey to be confirmed.
     */
    void (*passkey_confirm)(struct bt_conn *conn, unsigned int passkey);

    /** @brief Request the user to provide Out of Band (OOB) data.
     *
     *  When called the user is expected to provide OOB data. The required
     *  data are indicated by the information structure.
     *
     *  For LE Secure Connections OOB pairing, the user should provide
     *  local OOB data, remote OOB data or both depending on their
     *  availability. Their value should be given to the stack using the
     *  bt_le_oob_set_sc_data() API.
     *
     *  This callback must be set to non-NULL in order to support OOB
     *  pairing.
     *
     *  @param conn Connection where pairing is currently active.
     *  @param info OOB pairing information.
     */
    void (*oob_data_request)(struct bt_conn *conn, struct bt_conn_oob_info *info);

    /** @brief Cancel the ongoing user request.
     *
     *  This callback will be called to notify the application that it
     *  should cancel any previous user request (passkey display, entry
     *  or confirmation).
     *
     *  This may be set to NULL, but must always be provided whenever the
     *  passkey_display, passkey_entry passkey_confirm or pairing_confirm
     *  callback has been provided.
     *
     *  @param conn Connection where pairing is currently active.
     */
    void (*cancel)(struct bt_conn *conn);

    /** @brief Request confirmation for an incoming pairing.
     *
     *  This callback will be called to confirm an incoming pairing
     *  request where none of the other user callbacks is applicable.
     *
     *  If the user decides to accept the pairing the
     *  bt_conn_auth_pairing_confirm() API should be called. If the
     *  user decides to reject the pairing the bt_conn_auth_cancel() API
     *  should be called.
     *
     *  This callback may be set to NULL, which means that the local
     *  device lacks the ability to confirm a pairing request. If set
     *  to non-NULL the cancel callback must also be provided, since
     *  this is the only way the application can find out that it should
     *  stop requesting the user to confirm a pairing request.
     *
     *  @param conn Connection where pairing is currently active.
     */
    void (*pairing_confirm)(struct bt_conn *conn);
};

/** Authenticated pairing information callback structure */
struct bt_conn_auth_info_cb
{
    /** @brief notify that pairing procedure was complete.
     *
     *  This callback notifies the application that the pairing procedure
     *  has been completed.
     *
     *  @param conn Connection object.
     *  @param bonded Bond information has been distributed during the
     *                pairing procedure.
     */
    void (*pairing_complete)(struct bt_conn *conn, bool bonded);

    /** @brief notify that pairing process has failed.
     *
     *  @param conn Connection object.
     *  @param reason Pairing failed reason
     */
    void (*pairing_failed)(struct bt_conn *conn, enum bt_security_err reason);

    /** @brief Notify that bond has been deleted.
     *
     *  This callback notifies the application that the bond information
     *  for the remote peer has been deleted
     *
     *  @param id   Which local identity had the bond.
     *  @param peer Remote address.
     */
    void (*bond_deleted)(uint8_t id, const bt_addr_le_t *peer);

    /** Internally used field for list handling */
    sys_snode_t node;
};

/** @brief Register authentication callbacks.
 *
 *  Register callbacks to handle authenticated pairing. Passing NULL
 *  unregisters a previous callbacks structure.
 *
 *  @param cb Callback struct.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_cb_register(const struct bt_conn_auth_cb *cb);

/** @brief Overlay authentication callbacks used for a given connection.
 *
 *  This function can be used only for Bluetooth LE connections.
 *  The @kconfig{CONFIG_BT_SMP} must be enabled for this function.
 *
 *  The authentication callbacks for a given connection cannot be overlaid if
 *  security procedures in the SMP module have already started. This function
 *  can be called only once per connection.
 *
 *  @param conn	Connection object.
 *  @param cb	Callback struct.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_cb_overlay(struct bt_conn *conn, const struct bt_conn_auth_cb *cb);

/** @brief Register authentication information callbacks.
 *
 *  Register callbacks to get authenticated pairing information. Multiple
 *  registrations can be done.
 *
 *  @param cb Callback struct.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_info_cb_register(struct bt_conn_auth_info_cb *cb);

/** @brief Unregister authentication information callbacks.
 *
 *  Unregister callbacks to stop getting authenticated pairing information.
 *
 *  @param cb Callback struct.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_info_cb_unregister(struct bt_conn_auth_info_cb *cb);

/** @brief Reply with entered passkey.
 *
 *  This function should be called only after passkey_entry callback from
 *  bt_conn_auth_cb structure was called.
 *
 *  @param conn Connection object.
 *  @param passkey Entered passkey.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey);

/** @brief Cancel ongoing authenticated pairing.
 *
 *  This function allows to cancel ongoing authenticated pairing.
 *
 *  @param conn Connection object.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_cancel(struct bt_conn *conn);

/** @brief Reply if passkey was confirmed to match by user.
 *
 *  This function should be called only after passkey_confirm callback from
 *  bt_conn_auth_cb structure was called.
 *
 *  @param conn Connection object.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_passkey_confirm(struct bt_conn *conn);

/** @brief Reply if incoming pairing was confirmed by user.
 *
 *  This function should be called only after pairing_confirm callback from
 *  bt_conn_auth_cb structure was called if user confirmed incoming pairing.
 *
 *  @param conn Connection object.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_pairing_confirm(struct bt_conn *conn);

/** @brief Reply with entered PIN code.
 *
 *  This function should be called only after PIN code callback from
 *  bt_conn_auth_cb structure was called. It's for legacy 2.0 devices.
 *
 *  @param conn Connection object.
 *  @param pin Entered PIN code.
 *
 *  @return Zero on success or negative error code otherwise
 */
int bt_conn_auth_pincode_entry(struct bt_conn *conn, const char *pin);

/** Connection parameters for BR/EDR connections */
struct bt_br_conn_param
{
    bool allow_role_switch;
};

/** @brief Initialize BR/EDR connection parameters
 *
 *  @param role_switch True if role switch is allowed
 */
#define BT_BR_CONN_PARAM_INIT(role_switch)                                                         \
    {                                                                                              \
        .allow_role_switch = (role_switch),                                                        \
    }

/** Helper to declare BR/EDR connection parameters inline
 *
 * @param role_switch True if role switch is allowed
 */
#define BT_BR_CONN_PARAM(role_switch)                                                              \
    ((struct bt_br_conn_param[]){BT_BR_CONN_PARAM_INIT(role_switch)})

/** Default BR/EDR connection parameters:
 *    Role switch allowed
 */
#define BT_BR_CONN_PARAM_DEFAULT BT_BR_CONN_PARAM(true)

/** @brief Initiate an BR/EDR connection to a remote device.
 *
 *  Allows initiate new BR/EDR link to remote peer using its address.
 *
 *  The caller gets a new reference to the connection object which must be
 *  released with bt_conn_unref() once done using the object.
 *
 *  @param peer  Remote address.
 *  @param param Initial connection parameters.
 *
 *  @return Valid connection object on success or NULL otherwise.
 */
struct bt_conn *bt_conn_create_br(const bt_addr_t *peer, const struct bt_br_conn_param *param);

/** @brief Initiate an SCO connection to a remote device.
 *
 *  Allows initiate new SCO link to remote peer using its address.
 *
 *  The caller gets a new reference to the connection object which must be
 *  released with bt_conn_unref() once done using the object.
 *
 *  @param peer  Remote address.
 *
 *  @return Valid connection object on success or NULL otherwise.
 */
struct bt_conn *bt_conn_create_sco(const bt_addr_t *peer);

/* Look up an existing connection */
struct bt_conn *bt_conn_lookup_handle(uint16_t handle);

/* Check if the connection is with the given peer. */
int bt_conn_is_peer_addr_le(const struct bt_conn *conn, const bt_addr_le_t *peer);

void bt_conn_tx_polling(void);

/* Process incoming data for a connection */
void bt_conn_recv(struct bt_conn *conn, simple_buf_t *buf, uint8_t flags);

int bt_conn_le_conn_update(struct bt_conn *conn, const struct bt_le_conn_param *param);

void notify_remote_info(struct bt_conn *conn);

void notify_le_param_updated(struct bt_conn *conn);

void notify_le_data_len_updated(struct bt_conn *conn);

void notify_le_phy_updated(struct bt_conn *conn);

bool le_param_req(struct bt_conn *conn, struct bt_le_conn_param *param);

/* Prepare a PDU to be sent over a connection */
simple_buf_t *bt_conn_create_pdu(simple_buf_pool_t *pool, size_t reserve);

/* Look up a connection state. For BT_ADDR_LE_ANY, returns the first connection
 * with the specific state
 */
struct bt_conn *bt_conn_lookup_state_le(const bt_addr_le_t *peer,
                                        const bt_conn_state_t state);

/* Set connection object in certain state and perform action related to state */
void bt_conn_set_state(struct bt_conn *conn, bt_conn_state_t state);

void bt_conn_connected(struct bt_conn *conn);

struct bt_conn *acl_conn_new(void);

/* Initialize connection management */
int bt_conn_init(void);

int bt_conn_send(struct bt_conn *conn, simple_buf_t *buf);


uint8_t* bt_conn_get_pkts(struct bt_conn *conn);

uint8_t* bt_conn_get_tx_pending(struct bt_conn *conn);

#if defined(CONFIG_BT_SMP)
int bt_conn_le_start_encryption(struct bt_conn *conn, uint8_t rand[8], uint8_t ediv[2],
                                const uint8_t *ltk, size_t len);
#endif



#endif
