Bluetooth GATT (Generic Attribute Profile) API provides common functions for GATT client and GATT server.

Required Header

#include <bluetooth.h>

Overview

Two roles are defined for devices that implement GATT. The Server is the device that accepts incoming commands and requests from the client and sends responses, indications and notifications to a client. The Client is the device that initiates commands and requests towards the server and can receive responses, indications and notifications sent by the server. This API supports both Server role and Client role in GATT.
Bluetooth stack architecture has been changed. Thus, GATT APIs defined in Tizen 2.3 are deprecated and new GATT client APIs are defined.

Related Features

This API is related with the following features:

http://tizen.org/feature/network.bluetooth.le.gatt.server
http://tizen.org/feature/network.bluetooth.le.gatt.client

It is recommended to design feature related codes in your application for reliability.

You can check if a device supports the related features for this API by using System Information, thereby controlling the procedure of your application.

To ensure your application is only running on the device with specific features, please define the features in your manifest file using the manifest editor in the SDK.

More details on featuring your application can be found from Feature Element.

Functions
int	bt_gatt_get_value (bt_gatt_h gatt_handle, char *value, int value_length)
	Gets the value of a characteristic or descriptor's GATT handle.
int	bt_gatt_get_int_value (bt_gatt_h gatt_handle, bt_data_type_int_e type, int offset, int *value)
	Gets the value of a characteristic or descriptor's GATT handle as an integer type.
int	bt_gatt_get_float_value (bt_gatt_h gatt_handle, bt_data_type_float_e type, int offset, float *value)
	Gets the value of a characteristic or descriptor's GATT handle as a float type.
int	bt_gatt_set_value (bt_gatt_h gatt_handle, const char *value, int value_length)
	Updates the value of a characteristic or descriptor's GATT handle.
int	bt_gatt_set_int_value (bt_gatt_h gatt_handle, bt_data_type_int_e type, int value, int offset)
	Updates the value of a characteristic or descriptor's GATT handle using a integer type's value.
int	bt_gatt_set_float_value (bt_gatt_h gatt_handle, bt_data_type_float_e type, int mantissa, int exponent, int offset)
	Updates the value of a characteristic or descriptor's GATT handle using a float type's value.
int	bt_gatt_get_uuid (bt_gatt_h gatt_handle, char **uuid)
	Gets the UUID of a service, characteristic or descriptor's GATT handle.
int	bt_gatt_get_type (bt_gatt_h gatt_handle, bt_gatt_type_e *gatt_type)
	Gets the type of GATT handle.
int	bt_gatt_service_get_characteristic (bt_gatt_h service, const char uuid, bt_gatt_h characteristic)
	Gets a characteristic's GATT handle which has specific UUID.
int	bt_gatt_service_foreach_characteristics (bt_gatt_h service, bt_gatt_foreach_cb callback, void *user_data)
	Invokes callback function on each characteristic that belongs to the specified service.
int	bt_gatt_service_get_included_service (bt_gatt_h service, const char uuid, bt_gatt_h included_service)
	Gets an included service's GATT handle which has specific UUID.
int	bt_gatt_service_foreach_included_services (bt_gatt_h service, bt_gatt_foreach_cb callback, void *user_data)
	Invokes callback function on each included service that belongs to the specified service.
int	bt_gatt_characteristic_get_service (bt_gatt_h characteristic, bt_gatt_h *service)
	Gets the service's GATT handle which the specified characteristic belongs to.
int	bt_gatt_characteristic_get_properties (bt_gatt_h characteristic, int *properties)
	Gets the properties which a characteristic's GATT handle has.
int	bt_gatt_characteristic_get_write_type (bt_gatt_h characteristic, bt_gatt_write_type_e *write_type)
	Gets the write type of the specified characteristic.
int	bt_gatt_characteristic_set_write_type (bt_gatt_h characteristic, bt_gatt_write_type_e write_type)
	Updates the write type of the specified characteristic.
int	bt_gatt_characteristic_get_descriptor (bt_gatt_h characteristic, const char uuid, bt_gatt_h descriptor)
	Gets a descriptor's GATT handle which has specific UUID.
int	bt_gatt_characteristic_foreach_descriptors (bt_gatt_h characteristic, bt_gatt_foreach_cb callback, void *user_data)
	Invokes callback function on each descriptor that belongs to the specified characteristic.
int	bt_gatt_descriptor_get_characteristic (bt_gatt_h descriptor, bt_gatt_h *characteristic)
	Gets the characteristic's GATT handle which the specified descriptor belongs to.
int	bt_gatt_set_connection_state_changed_cb (bt_gatt_connection_state_changed_cb callback, void *user_data)
	Registers a callback function that will be invoked when the connection state is changed.
int	bt_gatt_unset_connection_state_changed_cb (void)
	Unregisters a callback function that will be invoked when the connection state is changed.
int	bt_gatt_characteristic_get_permissions (bt_gatt_h gatt_handle, int *permissions)
	Gets the permissions which a characteristic's GATT handle has.
int	bt_gatt_descriptor_get_permissions (bt_gatt_h gatt_handle, int *permissions)
	Gets the permissions which a descriptor's GATT handle has.
int	bt_gatt_characteristic_create (const char uuid, int permissions, int properties, const char value, int value_length, bt_gatt_h *characteristic)
	Creates the GATT characteristic.
int	bt_gatt_descriptor_create (const char uuid, int permissions, const char value, int value_length, bt_gatt_h *descriptor)
	Creates the GATT characteristic descriptor.
Typedefs
typedef void *	bt_gatt_h
	The handle of a service, characteristic or descriptor.
typedef bool(*	bt_gatt_foreach_cb )(int total, int index, bt_gatt_h gatt_handle, void *user_data)
	Called when you get GATT handles repeatedly.
typedef void(*	bt_hrp_connection_state_changed_cb )(int result, bool connected, const char *remote_address)
	Called when the connection state is changed.
typedef void(*	bt_gatt_connection_state_changed_cb )(int result, bool connected, const char remote_address, void user_data)
	Called when the connection state is changed.

Typedef Documentation

typedef void(* bt_gatt_connection_state_changed_cb)(int result, bool connected, const char *remote_address, void *user_data)

Called when the connection state is changed.

This callback is called when the connection state is changed. When you called bt_gatt_connect() or bt_gatt_disconnect(), this callback is also called with error result even though these functions fail.

Since :: 2.3.1

Parameters:

[in]	result	The result of changing the connection state.
[in]	connected	The state to be changed, true means connected state, Otherwise, false.
[in]	remote_address	The remote_address
[in]	user_data	The user data passed from the callback registration function.

See also:: bt_gatt_connect(); bt_gatt_disconnect(); bt_gatt_set_connection_state_changed_cb(); bt_gatt_unset_connection_state_changed_cb()

typedef bool(* bt_gatt_foreach_cb)(int total, int index, bt_gatt_h gatt_handle, void *user_data)

Called when you get GATT handles repeatedly.

Since :: 2.3.1

Parameters:

[in]	total	The total number of GATT handles to be called
[in]	index	The index of current GATT handle. It starts from 0.
[in]	gatt_handle	The GATT handle
[in]	user_data	The user data passed from the foreach function

See also:: bt_gatt_service_foreach_characteristics(); bt_gatt_service_foreach_included_services(); bt_gatt_characteristic_foreach_descriptors(); bt_gatt_client_foreach_services()

typedef void* bt_gatt_h

The handle of a service, characteristic or descriptor.

Since :: 2.3.1

typedef void(* bt_hrp_connection_state_changed_cb)(int result, bool connected, const char *remote_address)

Called when the connection state is changed.

This callback is called when the connection state is changed. When you called bt_gatt_connect() or bt_gatt_disconnect(), this callback is also called with error result even though these functions fail.

Since :: 4.0

Parameters:

[in]	result	The result of changing the connection state.
[in]	connected	The state to be changed, true means connected state, Otherwise, false.
[in]	remote_address	The remote_address
[in]	user_data	The user data passed from the callback registration function.

Enumeration Type Documentation

enum bt_data_type_float_e

Enumerations of the float type for GATT handle's value.

Since :: 2.3.1

Enumerator:

BT_DATA_TYPE_FLOAT	32 bit float type
BT_DATA_TYPE_SFLOAT	16 bit float type

enum bt_data_type_int_e

Enumerations of the integer type for GATT handle's value.

Since :: 2.3.1

Enumerator:

BT_DATA_TYPE_SINT8	8 bit signed int type
BT_DATA_TYPE_SINT16	16 bit signed int type
BT_DATA_TYPE_SINT32	32 bit signed int type
BT_DATA_TYPE_UINT8	8 bit unsigned int type
BT_DATA_TYPE_UINT16	16 bit unsigned int type
BT_DATA_TYPE_UINT32	32 bit unsigned int type

enum bt_gatt_permission_e

Enumerations of the attribute's permission.

Since :: 3.0

Enumerator:

BT_GATT_PERMISSION_READ	Readable permission
BT_GATT_PERMISSION_WRITE	Writable permission
BT_GATT_PERMISSION_ENCRYPT_READ	Readable permission required encryption
BT_GATT_PERMISSION_ENCRYPT_WRITE	Writable permission required encryption
BT_GATT_PERMISSION_ENCRYPT_AUTHENTICATED_READ	Readable permission required encryption and authentication
BT_GATT_PERMISSION_ENCRYPT_AUTHENTICATED_WRITE	Writable permission required encryption and authentication

enum bt_gatt_property_e

Enumerations of the characteristic's property.

Since :: 2.3.1

Enumerator:

BT_GATT_PROPERTY_BROADCAST	Broadcast property
BT_GATT_PROPERTY_READ	Read property
BT_GATT_PROPERTY_WRITE_WITHOUT_RESPONSE	Write without response property
BT_GATT_PROPERTY_WRITE	Write property
BT_GATT_PROPERTY_NOTIFY	Notify property
BT_GATT_PROPERTY_INDICATE	Indicate property
BT_GATT_PROPERTY_AUTHENTICATED_SIGNED_WRITES	Authenticated signed writes property
BT_GATT_PROPERTY_EXTENDED_PROPERTIES	Extended properties

enum bt_gatt_service_type_e

Enumerations of the service type.

Since :: 2.3.1

Enumerator:

BT_GATT_SERVICE_TYPE_PRIMARY	GATT primary service type
BT_GATT_SERVICE_TYPE_SECONDARY	GATT secondary service type

enum bt_gatt_type_e

Enumerations of the GATT handle's type.

Since :: 2.3.1

Enumerator:

BT_GATT_TYPE_SERVICE	GATT service type
BT_GATT_TYPE_CHARACTERISTIC	GATT characteristic type
BT_GATT_TYPE_DESCRIPTOR	GATT descriptor type

enum bt_gatt_write_type_e

Enumerations of the write type.

Since :: 2.3.1

Enumerator:

BT_GATT_WRITE_TYPE_WRITE_NO_RESPONSE	Write without response type
BT_GATT_WRITE_TYPE_WRITE	Write type

Function Documentation

int bt_gatt_characteristic_create	(	const char *	uuid,
		int	permissions,
		int	properties,
		const char *	value,
		int	value_length,
		bt_gatt_h *	characteristic
	)

Creates the GATT characteristic.

Since :: 3.0

Remarks:: The permissions can be one or more values of bt_gatt_permission_e, combined with bitwise 'or'.; The properties can be one or more values of bt_gatt_property_e, combined with bitwise 'or'.; The characteristic should be destroyed by using bt_gatt_characteristic_destroy().

Parameters:

[in]	uuid	The UUID of the characteristic
[in]	permissions	the permissions of the characteristic
[in]	properties	The properties of the characteristic
[in]	value	The value(byte stream) of the characteristic
[in]	value_length	The length of value
[out]	characteristic	The GATT handle of the created characteristic

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_OUT_OF_MEMORY	Out of memory
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_characteristic_destroy()

int bt_gatt_characteristic_foreach_descriptors	(	bt_gatt_h	characteristic,
		bt_gatt_foreach_cb	callback,
		void *	user_data
	)

Invokes callback function on each descriptor that belongs to the specified characteristic.

Since :: 2.3.1

Parameters:

[in]	characteristic	The characteristic's GATT handle
[in]	callback	The function to be invoked on each descriptor
[in]	user_data	The user data to be passed to callback function

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_foreach_cb()

int bt_gatt_characteristic_get_descriptor	(	bt_gatt_h	characteristic,
		const char *	uuid,
		bt_gatt_h *	descriptor
	)

Gets a descriptor's GATT handle which has specific UUID.

Since :: 2.3.1

Remarks:: The returned GATT handle must not be freed by application.
It will be freed when an associated client is destroyed by bt_gatt_client_destroy().
If there are multiple descriptors which have same UUID, only the first matched one will be returned.

Parameters:

[in]	characteristic	The characteristic's GATT handle
[in]	uuid	The descriptor's GATT handle which has this UUID will be returned if it exists
[out]	descriptor	The descriptor's GATT handle which has uuid if it exists

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NO_DATA	No data available
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_characteristic_get_permissions	(	bt_gatt_h	gatt_handle,
		int *	permissions
	)

Gets the permissions which a characteristic's GATT handle has.

Since :: 3.0

Remarks:: The permissions can be one or more values of bt_gatt_permission_e, combined with bitwise 'or'.

Parameters:

[in]	gatt_handle	The handle of a characteristic
[out]	permissions	The permissions which a characteristic's GATT handle has

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_characteristic_create(); bt_gatt_permission_e

int bt_gatt_characteristic_get_properties	(	bt_gatt_h	characteristic,
		int *	properties
	)

Gets the properties which a characteristic's GATT handle has.

Since :: 2.3.1

Parameters:

[in]	characteristic	The characteristic's GATT handle
[out]	properties	The properties which a characteristic's GATT handle has

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_property_e

int bt_gatt_characteristic_get_service	(	bt_gatt_h	characteristic,
		bt_gatt_h *	service
	)

Gets the service's GATT handle which the specified characteristic belongs to.

Since :: 2.3.1

Remarks:: The returned GATT handle must not be freed by application.
It will be freed when an associated client is destroyed by bt_gatt_client_destroy().

Parameters:

[in]	characteristic	The characteristic's GATT handle
[out]	service	The service's GATT handle which characteristic belongs to

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_characteristic_get_write_type	(	bt_gatt_h	characteristic,
		bt_gatt_write_type_e *	write_type
	)

Gets the write type of the specified characteristic.

Since :: 2.3.1

Parameters:

[in]	characteristic	The characteristic's GATT handle
[out]	write_type	The write type of the specified characteristic

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_write_type_e

int bt_gatt_characteristic_set_write_type	(	bt_gatt_h	characteristic,
		bt_gatt_write_type_e	write_type
	)

Updates the write type of the specified characteristic.

Since :: 2.3.1

Parameters:

[in]	characteristic	The characteristic's GATT handle
[in]	write_type	The write type to be updated

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_client_write_value(); bt_gatt_write_type_e

int bt_gatt_descriptor_create	(	const char *	uuid,
		int	permissions,
		const char *	value,
		int	value_length,
		bt_gatt_h *	descriptor
	)

Creates the GATT characteristic descriptor.

Since :: 3.0

Remarks:: The permissions can be one or more values of bt_gatt_permission_e, combined with bitwise 'or'.; The descriptor should be destroyed by using bt_gatt_descriptor_destroy().

Parameters:

[in]	uuid	The UUID of the descriptor
[in]	permissions	The permissions of the descriptor
[in]	value	The value(byte stream) associated with the descriptor
[in]	value_length	The length of value
[out]	descriptor	The GATT handle of the created characteristic descriptor

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_OUT_OF_MEMORY	Out of memory
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_descriptor_destroy()

int bt_gatt_descriptor_get_characteristic	(	bt_gatt_h	descriptor,
		bt_gatt_h *	characteristic
	)

Gets the characteristic's GATT handle which the specified descriptor belongs to.

Since :: 2.3.1

Remarks:: The returned GATT handle must not be freed by application.
It will be freed when an associated client is destroyed by bt_gatt_client_destroy().

Parameters:

[in]	descriptor	The descriptor's GATT handle
[out]	characteristic	The characteristic's GATT handle which descriptor belongs to

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_descriptor_get_permissions	(	bt_gatt_h	gatt_handle,
		int *	permissions
	)

Gets the permissions which a descriptor's GATT handle has.

Since :: 3.0

Remarks:: The permissions can be one or more values of bt_gatt_permission_e, combined with bitwise 'or'.

Parameters:

[in]	gatt_handle	The handle of a descriptor
[out]	permissions	The permissions which a descriptor's GATT handle has

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_descriptor_create(); bt_gatt_permission_e

int bt_gatt_get_float_value	(	bt_gatt_h	gatt_handle,
		bt_data_type_float_e	type,
		int	offset,
		float *	value
	)

Gets the value of a characteristic or descriptor's GATT handle as a float type.

Since :: 2.3.1

Remarks:: This function returns a locally saved value in gatt_handle.
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_read_value() must be used prior to this function
in order to get the remote device's current value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[in]	type	The type of a saved value in gatt_handle
[in]	offset	The offset from where a value will be read from gatt_handle as an integer type
[out]	value	The float type's value of gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_get_int_value	(	bt_gatt_h	gatt_handle,
		bt_data_type_int_e	type,
		int	offset,
		int *	value
	)

Gets the value of a characteristic or descriptor's GATT handle as an integer type.

Since :: 2.3.1

Remarks:: This function returns a locally saved value in gatt_handle.
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_read_value() must be used prior to this function
in order to get the remote device's current value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[in]	type	The type of a saved value in gatt_handle
[in]	offset	The offset from where a value will be read from gatt_handle as an integer type
[out]	value	The integer type's value of gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_get_type	(	bt_gatt_h	gatt_handle,
		bt_gatt_type_e *	gatt_type
	)

Gets the type of GATT handle.

Since :: 2.3.1

Parameters:

[in]	gatt_handle	The GATT handle
[out]	gatt_type	The type of gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_get_uuid	(	bt_gatt_h	gatt_handle,
		char **	uuid
	)

Gets the UUID of a service, characteristic or descriptor's GATT handle.

Since :: 2.3.1

Remarks:: uuid must be released using free().
16-bit UUID or 128-bit UUID is supported. (e.g. 2A19, 00002A19-0000-1000-8000-00805F9B34FB).

Parameters:

[in]	gatt_handle	The handle of a service, characteristic or descriptor
[out]	uuid	The string of the UUID of gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_get_value	(	bt_gatt_h	gatt_handle,
		char **	value,
		int *	value_length
	)

Gets the value of a characteristic or descriptor's GATT handle.

Since :: 2.3.1

Remarks:: value must be released using free().
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_read_value() must be used prior to this function
in order to get the remote device's current value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[out]	value	The value of gatt_handle. It is a byte stream type.
[out]	value_length	The length of value

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_service_foreach_characteristics	(	bt_gatt_h	service,
		bt_gatt_foreach_cb	callback,
		void *	user_data
	)

Invokes callback function on each characteristic that belongs to the specified service.

Since :: 2.3.1

Parameters:

[in]	service	The service's GATT handle
[in]	callback	The function to be invoked on each characteristic
[in]	user_data	The user data to be passed to callback function

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_foreach_cb()

int bt_gatt_service_foreach_included_services	(	bt_gatt_h	service,
		bt_gatt_foreach_cb	callback,
		void *	user_data
	)

Invokes callback function on each included service that belongs to the specified service.

Since :: 2.3.1

Parameters:

[in]	service	The service's GATT handle
[in]	callback	The function to be invoked on each included service
[in]	user_data	The user data to be passed to the callback function

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_foreach_cb()

int bt_gatt_service_get_characteristic	(	bt_gatt_h	service,
		const char *	uuid,
		bt_gatt_h *	characteristic
	)

Gets a characteristic's GATT handle which has specific UUID.

Since :: 2.3.1

Remarks:: The returned GATT handle must not be freed by application.
It will be freed when an associated client is destroyed by bt_gatt_client_destroy().
If there are multiple characteristics which have same UUID, only the first matched one will be returned.

Parameters:

[in]	service	The service's GATT handle
[in]	uuid	The characteristic's GATT handle which has this UUID will be returned if it exists
[out]	characteristic	The characteristic's GATT handle which has uuid if it exists

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NO_DATA	No data available
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_service_get_included_service	(	bt_gatt_h	service,
		const char *	uuid,
		bt_gatt_h *	included_service
	)

Gets an included service's GATT handle which has specific UUID.

Since :: 2.3.1

Remarks:: The returned GATT handle must not be freed by application.
It will be freed when an associated client is destroyed by bt_gatt_client_destroy().
If there are multiple included services which have same UUID, only the first matched one will be returned.

Parameters:

[in]	service	The service's GATT handle
[in]	uuid	The included service's GATT handle which has this UUID will be returned if it exists
[out]	included_service	The included service's GATT handle which has uuid if it exists

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NO_DATA	No data available
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_set_connection_state_changed_cb	(	bt_gatt_connection_state_changed_cb	callback,
		void *	user_data
	)

Registers a callback function that will be invoked when the connection state is changed.

Since :: 2.3.1

Parameters:

[in]	callback	The callback function to register.
[in]	user_data	The user data to be passed to the callback function.

Returns:: 0 on success, otherwise a negative error value.

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_NOT_INITIALIZED	Not initialized
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_connect(); bt_gatt_disconnect(); bt_gatt_unset_connection_state_changed_cb()

int bt_gatt_set_float_value	(	bt_gatt_h	gatt_handle,
		bt_data_type_float_e	type,
		int	mantissa,
		int	exponent,
		int	offset
	)

Updates the value of a characteristic or descriptor's GATT handle using a float type's value.

Since :: 2.3.1

Remarks:: This function updates a value of gatt_handle locally.
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_write_value() can be used after this function
in order to update the remote device's value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[in]	type	mantissa and exponent will be saved in gatt_handle as this type
[in]	mantissa	The mantissa of float type's value to be updated
[in]	exponent	The exponent of float type's value to be updated
[in]	offset	The offset from where mantissa and exponent will be saved in gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_OPERATION_FAILED	Operation failed
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_set_int_value	(	bt_gatt_h	gatt_handle,
		bt_data_type_int_e	type,
		int	value,
		int	offset
	)

Updates the value of a characteristic or descriptor's GATT handle using a integer type's value.

Since :: 2.3.1

Remarks:: This function updates a value of gatt_handle locally.
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_write_value() can be used after this function
in order to update the remote device's value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[in]	type	value will be saved in gatt_handle as this type
[in]	value	The integer type's value to be updated
[in]	offset	The offset from where value will be saved in gatt_handle

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_OPERATION_FAILED	Operation failed
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_set_value	(	bt_gatt_h	gatt_handle,
		const char *	value,
		int	value_length
	)

Updates the value of a characteristic or descriptor's GATT handle.

Since :: 2.3.1

Remarks:: This function updates a value of gatt_handle locally.
When gatt_handle is associated with bt_gatt_client_h, bt_gatt_client_write_value() can be used after this function
in order to update the remote device's value.

Parameters:

[in]	gatt_handle	The handle of a characteristic or descriptor
[in]	value	The value to be updated
[in]	value_length	The length of value

Returns:: 0 on success, otherwise a negative error value

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_INVALID_PARAMETER	Invalid parameter
BT_ERROR_OPERATION_FAILED	Operation failed
BT_ERROR_NOT_SUPPORTED	Not supported

int bt_gatt_unset_connection_state_changed_cb ( void )

Unregisters a callback function that will be invoked when the connection state is changed.

Since :: 2.3.1

Returns:: 0 on success, otherwise a negative error value.

Return values:

BT_ERROR_NONE	Successful
BT_ERROR_NOT_INITIALIZED	Not initialized
BT_ERROR_NOT_SUPPORTED	Not supported

See also:: bt_gatt_connect(); bt_gatt_disconnect(); bt_gatt_connection_state_changed_cb()

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