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/** @file
* @brief Generic Attribute Profile handling.
*/
/*
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __BT_GATT_H
#define __BT_GATT_H
/**
* @brief Generic Attribute Profile (GATT)
* @defgroup bt_gatt Generic Attribute Profile (GATT)
* @ingroup bluetooth
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h>
#include <sys/types.h>
#include <misc/util.h>
#include <bluetooth/conn.h>
#include <bluetooth/uuid.h>
#include <bluetooth/att.h>
/* GATT attribute permission bit field values */
enum {
/** No operations supported, e.g. for notify-only */
BT_GATT_PERM_NONE = 0,
/** Attribute read permission. */
BT_GATT_PERM_READ = BIT(0),
/** Attribute write permission. */
BT_GATT_PERM_WRITE = BIT(1),
/** Attribute read permission with encryption.
*
* If set, requires encryption for read access.
*/
BT_GATT_PERM_READ_ENCRYPT = BIT(2),
/** Attribute write permission with encryption.
*
* If set, requires encryption for write access.
*/
BT_GATT_PERM_WRITE_ENCRYPT = BIT(3),
/** Attribute read permission with authentication.
*
* If set, requires encryption using authenticated link-key for read
* access.
*/
BT_GATT_PERM_READ_AUTHEN = BIT(4),
/** Attribute write permission with authentication.
*
* If set, requires encryption using authenticated link-key for write
* access.
*/
BT_GATT_PERM_WRITE_AUTHEN = BIT(5),
/** Attribute prepare write permission.
*
* If set, allows prepare writes with use of BT_GATT_WRITE_FLAG_PREPARE
* passed to write callback.
*/
BT_GATT_PERM_PREPARE_WRITE = BIT(6),
};
/** @def BT_GATT_ERR
* @brief Construct error return value for attribute read and write callbacks.
*
* @param _att_err ATT error code
*
* @return Appropriate error code for the attribute callbacks.
*
*/
#define BT_GATT_ERR(_att_err) (-(_att_err))
/* GATT attribute write flags */
enum {
/** Attribute prepare write flag
*
* If set, write callback should only check if the device is
* authorized but no data shall be written.
*/
BT_GATT_WRITE_FLAG_PREPARE = BIT(0),
};
/** @brief GATT Attribute structure. */
struct bt_gatt_attr {
/** Attribute UUID */
const struct bt_uuid *uuid;
/** Attribute read callback
*
* @param conn The connection that is requesting to read
* @param attr The attribute that's being read
* @param buf Buffer to place the read result in
* @param len Length of data to read
* @param offset Offset to start reading from
*
* @return Number fo bytes read, or in case of an error
* BT_GATT_ERR() with a specific ATT error code.
*/
ssize_t (*read)(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
void *buf, u16_t len,
u16_t offset);
/** Attribute write callback
*
* @param conn The connection that is requesting to write
* @param attr The attribute that's being written
* @param buf Buffer with the data to write
* @param len Number of bytes in the buffer
* @param offset Offset to start writing from
* @param flags Flags (BT_GATT_WRITE_*)
*
* @return Number of bytes written, or in case of an error
* BT_GATT_ERR() with a specific ATT error code.
*/
ssize_t (*write)(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
const void *buf, u16_t len,
u16_t offset, u8_t flags);
/** Attribute user data */
void *user_data;
/** Attribute handle */
u16_t handle;
/** Attribute permissions */
u8_t perm;
};
/** @brief GATT Service structure */
struct bt_gatt_service {
/** Service Attributes */
struct bt_gatt_attr *attrs;
/** Service Attribute count */
size_t attr_count;
sys_snode_t node;
};
/** @brief Service Attribute Value. */
struct bt_gatt_service_val {
/** Service UUID. */
const struct bt_uuid *uuid;
/** Service end handle. */
u16_t end_handle;
};
/** @brief Include Attribute Value. */
struct bt_gatt_include {
/** Service UUID. */
const struct bt_uuid *uuid;
/** Service start handle. */
u16_t start_handle;
/** Service end handle. */
u16_t end_handle;
};
/* Characteristic Properties Bit field values */
/** @def BT_GATT_CHRC_BROADCAST
* @brief Characteristic broadcast property.
*
* If set, permits broadcasts of the Characteristic Value using Server
* Characteristic Configuration Descriptor.
*/
#define BT_GATT_CHRC_BROADCAST 0x01
/** @def BT_GATT_CHRC_READ
* @brief Characteristic read property.
*
* If set, permits reads of the Characteristic Value.
*/
#define BT_GATT_CHRC_READ 0x02
/** @def BT_GATT_CHRC_WRITE_WITHOUT_RESP
* @brief Characteristic write without response property.
*
* If set, permits write of the Characteristic Value without response.
*/
#define BT_GATT_CHRC_WRITE_WITHOUT_RESP 0x04
/** @def BT_GATT_CHRC_WRITE
* @brief Characteristic write with response property.
*
* If set, permits write of the Characteristic Value with response.
*/
#define BT_GATT_CHRC_WRITE 0x08
/** @def BT_GATT_CHRC_NOTIFY
* @brief Characteristic notify property.
*
* If set, permits notifications of a Characteristic Value without
* acknowledgment.
*/
#define BT_GATT_CHRC_NOTIFY 0x10
/** @def BT_GATT_CHRC_INDICATE
* @brief Characteristic indicate property.
*
* If set, permits indications of a Characteristic Value with acknowledgment.
*/
#define BT_GATT_CHRC_INDICATE 0x20
/** @def BT_GATT_CHRC_AUTH
* @brief Characteristic Authenticated Signed Writes property.
*
* If set, permits signed writes to the Characteristic Value.
*/
#define BT_GATT_CHRC_AUTH 0x40
/** @def BT_GATT_CHRC_EXT_PROP
* @brief Characteristic Extended Properties property.
*
* If set, additional characteristic properties are defined in the
* Characteristic Extended Properties Descriptor.
*/
#define BT_GATT_CHRC_EXT_PROP 0x80
/** @brief Characteristic Attribute Value. */
struct bt_gatt_chrc {
/** Characteristic UUID. */
const struct bt_uuid *uuid;
/** Characteristic properties. */
u8_t properties;
};
/* Characteristic Extended Properties Bit field values */
#define BT_GATT_CEP_RELIABLE_WRITE 0x0001
#define BT_GATT_CEP_WRITABLE_AUX 0x0002
/** @brief Characteristic Extended Properties Attribute Value. */
struct bt_gatt_cep {
/** Characteristic Extended properties */
u16_t properties;
};
/* Client Characteristic Configuration Values */
/** @def BT_GATT_CCC_NOTIFY
* @brief Client Characteristic Configuration Notification.
*
* If set, changes to Characteristic Value shall be notified.
*/
#define BT_GATT_CCC_NOTIFY 0x0001
/** @def BT_GATT_CCC_INDICATE
* @brief Client Characteristic Configuration Indication.
*
* If set, changes to Characteristic Value shall be indicated.
*/
#define BT_GATT_CCC_INDICATE 0x0002
/* Client Characteristic Configuration Attribute Value */
struct bt_gatt_ccc {
/** Client Characteristic Configuration flags */
u16_t flags;
};
/** @brief GATT Characteristic Presentation Format Attribute Value. */
struct bt_gatt_cpf {
/** Format of the value of the characteristic */
u8_t format;
/** Exponent field to determine how the value of this characteristic is further formatted */
s8_t exponent;
/** Unit of the characteristic */
u16_t unit;
/** Name space of the description */
u8_t name_space;
/** Description of the characteristic as defined in a higher layer profile */
u16_t description;
} __packed;
/* Server API */
/** @brief Register GATT service.
*
* Register GATT service. Applications can make use of
* macros such as BT_GATT_PRIMARY_SERVICE, BT_GATT_CHARACTERISTIC,
* BT_GATT_DESCRIPTOR, etc.
*
* @param svc Service containing the available attributes
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_service_register(struct bt_gatt_service *svc);
/** @brief Unregister GATT service.
* *
* @param svc Service to be unregistered.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_service_unregister(struct bt_gatt_service *svc);
enum {
BT_GATT_ITER_STOP = 0,
BT_GATT_ITER_CONTINUE,
};
/** @typedef bt_gatt_attr_func_t
* @brief Attribute iterator callback.
*
* @param attr Attribute found.
* @param user_data Data given.
*
* @return BT_GATT_ITER_CONTINUE if should continue to the next attribute
* or BT_GATT_ITER_STOP to stop.
*/
typedef u8_t (*bt_gatt_attr_func_t)(const struct bt_gatt_attr *attr,
void *user_data);
/** @brief Attribute iterator.
*
* Iterate attributes in the given range.
*
* @param start_handle Start handle.
* @param end_handle End handle.
* @param func Callback function.
* @param user_data Data to pass to the callback.
*/
void bt_gatt_foreach_attr(u16_t start_handle, u16_t end_handle,
bt_gatt_attr_func_t func, void *user_data);
/** @brief Iterate to the next attribute
*
* Iterate to the next attribute following a given attribute.
*
* @param attr Current Attribute.
*
* @return The next attribute or NULL if it cannot be found.
*/
struct bt_gatt_attr *bt_gatt_attr_next(const struct bt_gatt_attr *attr);
/** @brief Generic Read Attribute value helper.
*
* Read attribute value storing the result into buffer.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value.
* @param buf_len Buffer length.
* @param offset Start offset.
* @param value Attribute value.
* @param value_len Length of the attribute value.
*
* @return int number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read(struct bt_conn *conn, const struct bt_gatt_attr *attr,
void *buf, u16_t buf_len, u16_t offset,
const void *value, u16_t value_len);
/** @brief Read Service Attribute helper.
*
* Read service attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a bt_uuid.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value read.
* @param len Buffer length.
* @param offset Start offset.
*
* @return int number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_service(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
void *buf, u16_t len, u16_t offset);
/** @def BT_GATT_SERVICE
* @brief Service Structure Declaration Macro.
*
* Helper macro to declare a service structure.
*
* @param _attrs Service attributes.
*/
#define BT_GATT_SERVICE(_attrs) \
{ \
.attrs = _attrs, \
.attr_count = ARRAY_SIZE(_attrs), \
}
/** @def BT_GATT_PRIMARY_SERVICE
* @brief Primary Service Declaration Macro.
*
* Helper macro to declare a primary service attribute.
*
* @param _service Service attribute value.
*/
#define BT_GATT_PRIMARY_SERVICE(_service) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_PRIMARY, BT_GATT_PERM_READ, \
bt_gatt_attr_read_service, NULL, _service)
/** @def BT_GATT_SECONDARY_SERVICE
* @brief Secondary Service Declaration Macro.
*
* Helper macro to declare a secondary service attribute.
*
* @param _service Service attribute value.
*/
#define BT_GATT_SECONDARY_SERVICE(_service) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_SECONDARY, BT_GATT_PERM_READ, \
bt_gatt_attr_read_service, NULL, _service)
/** @brief Read Include Attribute helper.
*
* Read include service attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a bt_gatt_include.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value read.
* @param len Buffer length.
* @param offset Start offset.
*
* @return int number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_included(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
void *buf, u16_t len, u16_t offset);
/** @def BT_GATT_INCLUDE_SERVICE
* @brief Include Service Declaration Macro.
*
* Helper macro to declare database internal include service attribute.
*
* @param _service_incl the first service attribute of service to include
*/
#define BT_GATT_INCLUDE_SERVICE(_service_incl) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_INCLUDE, BT_GATT_PERM_READ, \
bt_gatt_attr_read_included, NULL, _service_incl)
/** @brief Read Characteristic Attribute helper.
*
* Read characteristic attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a bt_gatt_chrc.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value read.
* @param len Buffer length.
* @param offset Start offset.
*
* @return number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_chrc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
u16_t len, u16_t offset);
/** @def BT_GATT_CHARACTERISTIC
* @brief Characteristic and Value Declaration Macro.
*
* Helper macro to declare a characteristic attribute along with its
* attribute value.
*
* @param _uuid Characteristic attribute uuid.
* @param _props Characteristic attribute properties.
* @param _perm Characteristic Attribute access permissions.
* @param _read Characteristic Attribute read callback.
* @param _write Characteristic Attribute write callback.
* @param _value Characteristic Attribute value.
*/
#define BT_GATT_CHARACTERISTIC(_uuid, _props, _perm, _read, _write, _value) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_CHRC, BT_GATT_PERM_READ, \
bt_gatt_attr_read_chrc, NULL, \
(&(struct bt_gatt_chrc) { .uuid = _uuid, \
.properties = _props, })), \
BT_GATT_ATTRIBUTE(_uuid, _perm, _read, _write, _value)
#define BT_GATT_CCC_MAX (CONFIG_BT_MAX_PAIRED + CONFIG_BT_MAX_CONN)
/** @brief GATT CCC configuration entry.
* @param peer Remote peer address
* @param value Configuration value.
* @param data Configuration pointer data.
*/
struct bt_gatt_ccc_cfg {
bt_addr_le_t peer;
u16_t value;
u8_t data[4] __aligned(4);
};
/* Internal representation of CCC value */
struct _bt_gatt_ccc {
struct bt_gatt_ccc_cfg *cfg;
size_t cfg_len;
u16_t value;
void (*cfg_changed)(const struct bt_gatt_attr *attr,
u16_t value);
};
/** @brief Read Client Characteristic Configuration Attribute helper.
*
* Read CCC attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a _bt_gatt_ccc.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value read.
* @param len Buffer length.
* @param offset Start offset.
*
* @return number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_ccc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
u16_t len, u16_t offset);
/** @brief Write Client Characteristic Configuration Attribute helper.
*
* Write value in the buffer into CCC attribute.
* NOTE: Only use this with attributes which user_data is a _bt_gatt_ccc.
*
* @param conn Connection object.
* @param attr Attribute to read.
* @param buf Buffer to store the value read.
* @param len Buffer length.
* @param offset Start offset.
* @param flags Write flags.
*
* @return number of bytes written in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_write_ccc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, const void *buf,
u16_t len, u16_t offset, u8_t flags);
/** @def BT_GATT_CCC
* @brief Client Characteristic Configuration Declaration Macro.
*
* Helper macro to declare a CCC attribute.
*
* @param _cfg Initial configuration.
* @param _cfg_changed Configuration changed callback.
*/
#define BT_GATT_CCC(_cfg, _cfg_changed) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_CCC, \
BT_GATT_PERM_READ | BT_GATT_PERM_WRITE, \
bt_gatt_attr_read_ccc, bt_gatt_attr_write_ccc, \
(&(struct _bt_gatt_ccc) { .cfg = _cfg, \
.cfg_len = ARRAY_SIZE(_cfg), \
.cfg_changed = _cfg_changed, }))
/** @brief Read Characteristic Extended Properties Attribute helper
*
* Read CEP attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a bt_gatt_cep.
*
* @param conn Connection object
* @param attr Attribute to read
* @param buf Buffer to store the value read
* @param len Buffer length
* @param offset Start offset
*
* @return number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_cep(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
u16_t len, u16_t offset);
/** @def BT_GATT_CEP
* @brief Characteristic Extended Properties Declaration Macro.
*
* Helper macro to declare a CEP attribute.
*
* @param _value Descriptor attribute value.
*/
#define BT_GATT_CEP(_value) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_CEP, BT_GATT_PERM_READ, \
bt_gatt_attr_read_cep, NULL, _value)
/** @brief Read Characteristic User Description Descriptor Attribute helper
*
* Read CUD attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a NULL-terminated C string.
*
* @param conn Connection object
* @param attr Attribute to read
* @param buf Buffer to store the value read
* @param len Buffer length
* @param offset Start offset
*
* @return number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_cud(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
u16_t len, u16_t offset);
/** @def BT_GATT_CUD
* @brief Characteristic User Format Descriptor Declaration Macro.
*
* Helper macro to declare a CUD attribute.
*
* @param _value User description NULL-terminated C string.
* @param _perm Descriptor attribute access permissions.
*/
#define BT_GATT_CUD(_value, _perm) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_CUD, _perm, bt_gatt_attr_read_cud, \
NULL, _value)
/** @brief Read Characteristic Presentation format Descriptor Attribute helper
*
* Read CPF attribute value storing the result into buffer after
* encoding it.
* NOTE: Only use this with attributes which user_data is a bt_gatt_pf.
*
* @param conn Connection object
* @param attr Attribute to read
* @param buf Buffer to store the value read
* @param len Buffer length
* @param offset Start offset
*
* @return number of bytes read in case of success or negative values in
* case of error.
*/
ssize_t bt_gatt_attr_read_cpf(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
u16_t len, u16_t offset);
/** @def BT_GATT_CPF
* @brief Characteristic Presentation Format Descriptor Declaration Macro.
*
* Helper macro to declare a CPF attribute.
*
* @param _value Descriptor attribute value.
*/
#define BT_GATT_CPF(_value) \
BT_GATT_ATTRIBUTE(BT_UUID_GATT_CPF, BT_GATT_PERM_READ, \
bt_gatt_attr_read_cpf, NULL, _value)
/** @def BT_GATT_DESCRIPTOR
* @brief Descriptor Declaration Macro.
*
* Helper macro to declare a descriptor attribute.
*
* @param _uuid Descriptor attribute uuid.
* @param _perm Descriptor attribute access permissions.
* @param _read Descriptor attribute read callback.
* @param _write Descriptor attribute write callback.
* @param _value Descriptor attribute value.
*/
#define BT_GATT_DESCRIPTOR(_uuid, _perm, _read, _write, _value) \
BT_GATT_ATTRIBUTE(_uuid, _perm, _read, _write, _value)
/** @def BT_GATT_ATTRIBUTE
* @brief Attribute Declaration Macro.
*
* Helper macro to declare an attribute.
*
* @param _uuid Attribute uuid.
* @param _perm Attribute access permissions.
* @param _read Attribute read callback.
* @param _write Attribute write callback.
* @param _value Attribute value.
*/
#define BT_GATT_ATTRIBUTE(_uuid, _perm, _read, _write, _value) \
{ \
.uuid = _uuid, \
.perm = _perm, \
.read = _read, \
.write = _write, \
.user_data = _value, \
}
/** @brief Notify attribute value change.
*
* Send notification of attribute value change, if connection is NULL notify
* all peer that have notification enabled via CCC otherwise do a direct
* notification only the given connection.
*
* The attribute object must be the so called Characteristic Value Descriptor,
* its usually declared with BT_GATT_DESCRIPTOR after BT_GATT_CHARACTERISTIC
* and before BT_GATT_CCC.
*
* @param conn Connection object.
* @param attr Characteristic Value Descriptor attribute.
* @param data Pointer to Attribute data.
* @param len Attribute value length.
*/
int bt_gatt_notify(struct bt_conn *conn, const struct bt_gatt_attr *attr,
const void *data, u16_t len);
/** @typedef bt_gatt_indicate_func_t
* @brief Indication complete result callback.
*
* @param conn Connection object.
* @param attr Attribute object.
* @param err ATT error code
*
* @return 0 in case of success or negative value in case of error.
*/
typedef void (*bt_gatt_indicate_func_t)(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
u8_t err);
/** @brief GATT Indicate Value parameters */
struct bt_gatt_indicate_params {
struct bt_att_req _req;
/** Indicate Attribute object*/
const struct bt_gatt_attr *attr;
/** Indicate Value callback */
bt_gatt_indicate_func_t func;
/** Indicate Value data*/
const void *data;
/** Indicate Value length*/
u16_t len;
};
/** @brief Indicate attribute value change.
*
* Send an indication of attribute value change.
* Note: This function should only be called if CCC is declared with
* BT_GATT_CCC otherwise it cannot find a valid peer configuration.
*
* Note: This procedure is asynchronous therefore the parameters need to
* remains valid while it is active.
*
* @param conn Connection object.
* @param params Indicate parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_indicate(struct bt_conn *conn,
struct bt_gatt_indicate_params *params);
/** @brief Get ATT MTU for a connection
*
* Get negotiated ATT connection MTU, note that this does not equal the largest
* amount of attribute data that can be transferred within a single packet.
*
* @param conn Connection object.
*
* @return MTU in bytes
*/
u16_t bt_gatt_get_mtu(struct bt_conn *conn);
/* Client API */
/** @brief GATT Exchange MTU parameters */
struct bt_gatt_exchange_params {
struct bt_att_req _req;
/** Response callback */
void (*func)(struct bt_conn *conn, u8_t err,
struct bt_gatt_exchange_params *params);
};
/** @brief Exchange MTU
*
* This client procedure can be used to set the MTU to the maximum possible
* size the buffers can hold.
*
* NOTE: Shall only be used once per connection.
*
* @param conn Connection object.
* @param params Exchange MTU parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_exchange_mtu(struct bt_conn *conn,
struct bt_gatt_exchange_params *params);
struct bt_gatt_discover_params;
/** @typedef bt_gatt_discover_func_t
* @brief Discover attribute callback function.
*
* @param conn Connection object.
* @param attr Attribute found.
* @param params Discovery parameters given.
*
* If discovery procedure has completed this callback will be called with
* attr set to NULL. This will not happen if procedure was stopped by returning
* BT_GATT_ITER_STOP. The attribute is read-only and cannot be cached without
* copying its contents.
*
* @return BT_GATT_ITER_CONTINUE if should continue attribute discovery
* or BT_GATT_ITER_STOP to stop discovery procedure.
*/
typedef u8_t (*bt_gatt_discover_func_t)(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
struct bt_gatt_discover_params *params);
enum {
BT_GATT_DISCOVER_PRIMARY,
BT_GATT_DISCOVER_SECONDARY,
BT_GATT_DISCOVER_INCLUDE,
BT_GATT_DISCOVER_CHARACTERISTIC,
BT_GATT_DISCOVER_DESCRIPTOR,
};
/** @brief GATT Discover Attributes parameters */
struct bt_gatt_discover_params {
struct bt_att_req _req;
/** Discover UUID type */
struct bt_uuid *uuid;
/** Discover attribute callback */
bt_gatt_discover_func_t func;
union {
struct {
/** Include service attribute declaration handle */
u16_t attr_handle;
/** Included service start handle */
u16_t start_handle;
/** Included service end handle */
u16_t end_handle;
} _included;
/** Discover start handle */
u16_t start_handle;
};
/** Discover end handle */
u16_t end_handle;
/** Discover type */
u8_t type;
};
/** @brief GATT Discover function
*
* This procedure is used by a client to discover attributes on a server.
*
* Primary Service Discovery: Procedure allows to discover specific Primary
* Service based on UUID.
* Include Service Discovery: Procedure allows to discover all Include Services
* within specified range.
* Characteristic Discovery: Procedure allows to discover all characteristics
* within specified handle range as well as
* discover characteristics with specified UUID.
* Descriptors Discovery: Procedure allows to discover all characteristic
* descriptors within specified range.
*
* For each attribute found the callback is called which can then decide
* whether to continue discovering or stop.
*
* Note: This procedure is asynchronous therefore the parameters need to
* remains valid while it is active.
*
* @param conn Connection object.
* @param params Discover parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_discover(struct bt_conn *conn,
struct bt_gatt_discover_params *params);
struct bt_gatt_read_params;
/** @typedef bt_gatt_read_func_t
* @brief Read callback function
*
* @param conn Connection object.
* @param err ATT error code.
* @param params Read parameters used.
* @param data Attribute value data. NULL means read has completed.
* @param length Attribute value length.
*/
typedef u8_t (*bt_gatt_read_func_t)(struct bt_conn *conn, u8_t err,
struct bt_gatt_read_params *params,
const void *data, u16_t length);
/** @brief GATT Read parameters
* @param func Read attribute callback
* @param handle_count If equals to 1 single.handle and single.offset
* are used. If >1 Read Multiple Characteristic
* Values is performed and handles are used.
* @param handle Attribute handle
* @param offset Attribute data offset
* @param handles Handles to read in Read Multiple Characteristic Values
*/
struct bt_gatt_read_params {
struct bt_att_req _req;
bt_gatt_read_func_t func;
size_t handle_count;
union {
struct {
u16_t handle;
u16_t offset;
} single;
u16_t *handles;
};
};
/** @brief Read Attribute Value by handle
*
* This procedure read the attribute value and return it to the callback.
*
* Note: This procedure is asynchronous therefore the parameters need to
* remains valid while it is active.
*
* @param conn Connection object.
* @param params Read parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_read(struct bt_conn *conn, struct bt_gatt_read_params *params);
struct bt_gatt_write_params;
/** @typedef bt_gatt_write_func_t
* @brief Write callback function
*
* @param conn Connection object.
* @param err ATT error code.
* @param params Write parameters used.
*/
typedef void (*bt_gatt_write_func_t)(struct bt_conn *conn, u8_t err,
struct bt_gatt_write_params *params);
/** @brief GATT Write parameters */
struct bt_gatt_write_params {
struct bt_att_req _req;
/** Response callback */
bt_gatt_write_func_t func;
/** Attribute handle */
u16_t handle;
/** Attribute data offset */
u16_t offset;
/** Data to be written */
const void *data;
/** Length of the data */
u16_t length;
};
/** @brief Write Attribute Value by handle
*
* This procedure write the attribute value and return the result in the
* callback.
*
* Note: This procedure is asynchronous therefore the parameters need to
* remains valid while it is active.
*
* @param conn Connection object.
* @param params Write parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_write(struct bt_conn *conn, struct bt_gatt_write_params *params);
/** @brief Write Attribute Value by handle without response
*
* This procedure write the attribute value without requiring an
* acknowledgment that the write was successfully performed
*
* @param conn Connection object.
* @param handle Attribute handle.
* @param data Data to be written.
* @param length Data length.
* @param sign Whether to sign data
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_write_without_response(struct bt_conn *conn, u16_t handle,
const void *data, u16_t length,
bool sign);
struct bt_gatt_subscribe_params;
/** @typedef bt_gatt_notify_func_t
* @brief Notification callback function
*
* @param conn Connection object.
* @param params Subscription parameters.
* @param data Attribute value data. If NULL then subscription was removed.
* @param length Attribute value length.
*/
typedef u8_t (*bt_gatt_notify_func_t)(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params,
const void *data, u16_t length);
/* Subscription flags */
enum {
/** Persistence flag
*
* If set, indicates that the subscription is not saved
* on the GATT server side. Therefore, upon disconnection,
* the subscription will be automatically removed
* from the client's subscriptions list and
* when the client reconnects, it will have to
* issue a new subscription.
*/
BT_GATT_SUBSCRIBE_FLAG_VOLATILE = BIT(0),
};
/** @brief GATT Subscribe parameters */
struct bt_gatt_subscribe_params {
struct bt_att_req _req;
bt_addr_le_t _peer;
/** Notification value callback */
bt_gatt_notify_func_t notify;
/** Subscribe value handle */
u16_t value_handle;
/** Subscribe CCC handle */
u16_t ccc_handle;
/** Subscribe value */
u16_t value;
/** Subscription flags */
u8_t flags;
sys_snode_t node;
};
/** @brief Subscribe Attribute Value Notification
*
* This procedure subscribe to value notification using the Client
* Characteristic Configuration handle.
* If notification received subscribe value callback is called to return
* notified value. One may then decide whether to unsubscribe directly from
* this callback. Notification callback with NULL data will not be called if
* subscription was removed by this method.
*
* Note: This procedure is asynchronous therefore the parameters need to
* remains valid while it is active.
*
* @param conn Connection object.
* @param params Subscribe parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_subscribe(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params);
/** @brief Unsubscribe Attribute Value Notification
*
* This procedure unsubscribe to value notification using the Client
* Characteristic Configuration handle. Notification callback with NULL data
* will be called if subscription was removed by this call, until then the
* parameters cannot be reused.
*
* @param conn Connection object.
* @param params Subscribe parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_unsubscribe(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params);
/** @brief Cancel GATT pending request
*
* @param conn Connection object.
* @param params Requested params address.
*/
void bt_gatt_cancel(struct bt_conn *conn, void *params);
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#endif /* __BT_GATT_H */