GATT Client API

Application Examples

bluetooth/bluedroid/ble/gatt_client demonstrates how to create a GATT Client that connects to a GATT server, enabling the server's notification function to discover its service.
bluetooth/bluedroid/ble/gattc_multi_connect demonstrates how to create a GATT Client that connects to multiple GATT servers, enabling their notification functions to discover their services.
bluetooth/bluedroid/coex/gattc_gatts_coex demonstrates the coexistence of GATT client and GATT server by creating a GATT service, starting ADV, and exchanging data between a GATT client and device.

API Reference

Header File

components/bt/host/bluedroid/api/include/api/esp_gattc_api.h
This header file can be included with:
#include "esp_gattc_api.h"
This header file is a part of the API provided by the bt component. To declare that your component depends on bt, add the following to your CMakeLists.txt:
REQUIRES bt
or
PRIV_REQUIRES bt

Functions

esp_err_t esp_ble_gattc_register_callback(esp_gattc_cb_t callback)

This function is called to register application callbacks with GATTC module.

Note

Avoid performing time-consuming operations within the callback functions.

Parameters

callback -- [in] : pointer to the application callback function.

Returns

ESP_OK: success
other: failed

esp_gattc_cb_t esp_ble_gattc_get_callback(void)

This function is called to get the current application callbacks with BTA GATTC module.

Returns

esp_gattC_cb_t : current callback

esp_err_t esp_ble_gattc_app_register(uint16_t app_id)

This function is called to register application callbacks with GATTC module.

Parameters

app_id -- [in] : Application Identify (UUID), for different application

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_app_unregister(esp_gatt_if_t gattc_if)

This function is called to unregister an application from the GATTC module.

Note

Before calling this API, ensure that all activities related to the application, such as connections, scans, ADV, are properly closed.

Parameters

gattc_if -- [in] Gatt client access interface.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_enh_open(esp_gatt_if_t gattc_if, esp_ble_gatt_creat_conn_params_t *esp_gatt_create_conn)

Open a direct connection or add a background auto connection. Note: Do not enable both BLE_42_FEATURE_SUPPORT and BLE_50_FEATURE_SUPPORT configuration options simultaneously.

Parameters

gattc_if -- [in] GATT client access interface.
esp_gatt_create_conn -- [in] Pointer to the structure containing connection parameters.

Returns

ESP_OK: Operation successful
others: Operation failed

esp_err_t esp_ble_gattc_open(esp_gatt_if_t gattc_if, esp_bd_addr_t remote_bda, esp_ble_addr_type_t remote_addr_type, bool is_direct)

Open a direct connection or add a background auto connection.

Parameters

gattc_if -- [in] Gatt client access interface.
remote_bda -- [in] remote device bluetooth device address.
remote_addr_type -- [in] remote device bluetooth device the address type.
is_direct -- [in] direct connection or background auto connection(by now, background auto connection is not supported).

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_aux_open(esp_gatt_if_t gattc_if, esp_bd_addr_t remote_bda, esp_ble_addr_type_t remote_addr_type, bool is_direct)

esp_err_t esp_ble_gattc_close(esp_gatt_if_t gattc_if, uint16_t conn_id)

Close the virtual connection to the GATT server. gattc may have multiple virtual GATT server connections when multiple app_id registered, this API only close one virtual GATT server connection. if there exist other virtual GATT server connections, it does not disconnect the physical connection. if you want to disconnect the physical connection directly, you can use esp_ble_gap_disconnect(esp_bd_addr_t remote_device).

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID to be closed.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_send_mtu_req(esp_gatt_if_t gattc_if, uint16_t conn_id)

Configure the MTU size in the GATT channel. This can be done only once per connection. Before using, use esp_ble_gatt_set_local_mtu() to configure the local MTU size.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_search_service(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_bt_uuid_t *filter_uuid)

This function is called to get service from local cache. This function report service search result by a callback event, and followed by a service search complete event. Note: 128-bit base UUID will automatically be converted to a 16-bit UUID in the search results. Other types of UUID remain unchanged.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID.
filter_uuid -- [in] a UUID of the service application is interested in. If Null, discover for all services.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_service(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_bt_uuid_t *svc_uuid, esp_gattc_service_elem_t *result, uint16_t *count, uint16_t offset)

Find all the service with the given service uuid in the gattc cache, if the svc_uuid is NULL, find all the service. Note: It just get service from local cache, won't get from remote devices. If want to get it from remote device, need to used the esp_ble_gattc_cache_refresh, then call esp_ble_gattc_get_service again.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
svc_uuid -- [in] the pointer to the service uuid.
result -- [out] The pointer to the service which has been found in the gattc cache.
count -- [inout] input the number of service want to find, it will output the number of service has been found in the gattc cache with the given service uuid.
offset -- [in] Offset of the service position to get.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_all_char(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_gattc_char_elem_t *result, uint16_t *count, uint16_t offset)

Find all the characteristic with the given service in the gattc cache Note: It just get characteristic from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
start_handle -- [in] the attribute start handle.
end_handle -- [in] the attribute end handle
result -- [out] The pointer to the characteristic in the service.
count -- [inout] input the number of characteristic want to find, it will output the number of characteristic has been found in the gattc cache with the given service.
offset -- [in] Offset of the characteristic position to get.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_all_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t char_handle, esp_gattc_descr_elem_t *result, uint16_t *count, uint16_t offset)

Find all the descriptor with the given characteristic in the gattc cache Note: It just get descriptor from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
char_handle -- [in] the given characteristic handle
result -- [out] The pointer to the descriptor in the characteristic.
count -- [inout] input the number of descriptor want to find, it will output the number of descriptor has been found in the gattc cache with the given characteristic.
offset -- [in] Offset of the descriptor position to get.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_char_by_uuid(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_bt_uuid_t char_uuid, esp_gattc_char_elem_t *result, uint16_t *count)

Find the characteristic with the given characteristic uuid in the gattc cache Note: It just get characteristic from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
start_handle -- [in] the attribute start handle
end_handle -- [in] the attribute end handle
char_uuid -- [in] the characteristic uuid
result -- [out] The pointer to the characteristic in the service.
count -- [inout] input the number of characteristic want to find, it will output the number of characteristic has been found in the gattc cache with the given service.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_descr_by_uuid(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_bt_uuid_t char_uuid, esp_bt_uuid_t descr_uuid, esp_gattc_descr_elem_t *result, uint16_t *count)

Find the descriptor with the given characteristic uuid in the gattc cache Note: It just get descriptor from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
start_handle -- [in] the attribute start handle
end_handle -- [in] the attribute end handle
char_uuid -- [in] the characteristic uuid.
descr_uuid -- [in] the descriptor uuid.
result -- [out] The pointer to the descriptor in the given characteristic.
count -- [inout] input the number of descriptor want to find, it will output the number of descriptor has been found in the gattc cache with the given characteristic.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_descr_by_char_handle(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t char_handle, esp_bt_uuid_t descr_uuid, esp_gattc_descr_elem_t *result, uint16_t *count)

Find the descriptor with the given characteristic handle in the gattc cache Note: It just get descriptor from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
char_handle -- [in] the characteristic handle.
descr_uuid -- [in] the descriptor uuid.
result -- [out] The pointer to the descriptor in the given characteristic.
count -- [inout] input the number of descriptor want to find, it will output the number of descriptor has been found in the gattc cache with the given characteristic.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_include_service(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_bt_uuid_t *incl_uuid, esp_gattc_incl_svc_elem_t *result, uint16_t *count)

Find the include service with the given service handle in the gattc cache Note: It just get include service from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
start_handle -- [in] the attribute start handle
end_handle -- [in] the attribute end handle
incl_uuid -- [in] the include service uuid
result -- [out] The pointer to the include service in the given service.
count -- [inout] input the number of include service want to find, it will output the number of include service has been found in the gattc cache with the given service.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_attr_count(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_db_attr_type_t type, uint16_t start_handle, uint16_t end_handle, uint16_t char_handle, uint16_t *count)

Find the attribute count with the given service or characteristic in the gattc cache.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] connection ID which identify the server.
type -- [in] the attribute type.
start_handle -- [in] the attribute start handle, if the type is ESP_GATT_DB_DESCRIPTOR, this parameter should be ignore
end_handle -- [in] the attribute end handle, if the type is ESP_GATT_DB_DESCRIPTOR, this parameter should be ignore
char_handle -- [in] the characteristic handle, this parameter valid when the type is ESP_GATT_DB_DESCRIPTOR. If the type isn't ESP_GATT_DB_DESCRIPTOR, this parameter should be ignore.
count -- [out] output the number of attribute has been found in the gattc cache with the given attribute type.

Returns

ESP_OK: success
other: failed

esp_gatt_status_t esp_ble_gattc_get_db(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_gattc_db_elem_t *db, uint16_t *count)

This function is called to get the GATT database. Note: It just get attribute data base from local cache, won't get from remote devices.

Parameters

gattc_if -- [in] Gatt client access interface.
start_handle -- [in] the attribute start handle
end_handle -- [in] the attribute end handle
conn_id -- [in] connection ID which identify the server.
db -- [in] output parameter which will contain the GATT database copy. Caller is responsible for freeing it.
count -- [in] number of elements in database.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_read_char(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, esp_gatt_auth_req_t auth_req)

This function is called to read a service's characteristics of the given characteristic handle.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
handle -- [in] : characteristic handle to read.
auth_req -- [in] : authenticate request type

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_read_by_type(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, esp_bt_uuid_t *uuid, esp_gatt_auth_req_t auth_req)

This function is called to read a service's characteristics of the given characteristic UUID.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
start_handle -- [in] : the attribute start handle.
end_handle -- [in] : the attribute end handle
uuid -- [in] : The UUID of attribute which will be read.
auth_req -- [in] : authenticate request type

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_read_multiple(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gattc_multi_t *read_multi, esp_gatt_auth_req_t auth_req)

This function is called to read multiple characteristic or characteristic descriptors.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
read_multi -- [in] : pointer to the read multiple parameter.
auth_req -- [in] : authenticate request type

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_read_multiple_variable(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gattc_multi_t *read_multi, esp_gatt_auth_req_t auth_req)

This function is called to read multiple variable length characteristic or characteristic descriptors.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
read_multi -- [in] : pointer to the read multiple parameter.
auth_req -- [in] : authenticate request type

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_read_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, esp_gatt_auth_req_t auth_req)

This function is called to read a characteristics descriptor.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
handle -- [in] : descriptor handle to read.
auth_req -- [in] : authenticate request type

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_write_char(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, uint16_t value_len, uint8_t *value, esp_gatt_write_type_t write_type, esp_gatt_auth_req_t auth_req)

This function is called to write characteristic value.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
handle -- [in] : characteristic handle to write.
value_len -- [in] length of the value to be written.
value -- [in] : the value to be written.
write_type -- [in] : the type of attribute write operation.
auth_req -- [in] : authentication request.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_write_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, uint16_t value_len, uint8_t *value, esp_gatt_write_type_t write_type, esp_gatt_auth_req_t auth_req)

This function is called to write characteristic descriptor value.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID
handle -- [in] : descriptor handle to write.
value_len -- [in] length of the value to be written.
value -- [in] : the value to be written.
write_type -- [in] : the type of attribute write operation.
auth_req -- [in] : authentication request.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_prepare_write(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, uint16_t offset, uint16_t value_len, uint8_t *value, esp_gatt_auth_req_t auth_req)

This function is called to prepare write a characteristic value.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
handle -- [in] : characteristic handle to prepare write.
offset -- [in] : offset of the write value.
value_len -- [in] length of the value to be written.
value -- [in] : the value to be written.
auth_req -- [in] : authentication request.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_prepare_write_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t handle, uint16_t offset, uint16_t value_len, uint8_t *value, esp_gatt_auth_req_t auth_req)

This function is called to prepare write a characteristic descriptor value.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
handle -- [in] : characteristic descriptor handle to prepare write.
offset -- [in] : offset of the write value.
value_len -- [in] length of the value to be written.
value -- [in] : the value to be written.
auth_req -- [in] : authentication request.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_execute_write(esp_gatt_if_t gattc_if, uint16_t conn_id, bool is_execute)

This function is called to execute write a prepare write sequence.

Parameters

gattc_if -- [in] Gatt client access interface.
conn_id -- [in] : connection ID.
is_execute -- [in] : execute or cancel.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_register_for_notify(esp_gatt_if_t gattc_if, esp_bd_addr_t server_bda, uint16_t handle)

This function is called to register for notification of a service.

Parameters

gattc_if -- [in] Gatt client access interface.
server_bda -- [in] : target GATT server.
handle -- [in] : GATT characteristic handle.

Returns

ESP_OK: registration succeeds
other: failed

esp_err_t esp_ble_gattc_unregister_for_notify(esp_gatt_if_t gattc_if, esp_bd_addr_t server_bda, uint16_t handle)

This function is called to de-register for notification of a service.

Parameters

gattc_if -- [in] Gatt client access interface.
server_bda -- [in] : target GATT server.
handle -- [in] : GATT characteristic handle.

Returns

ESP_OK: unregister succeeds
other: failed

esp_err_t esp_ble_gattc_cache_refresh(esp_bd_addr_t remote_bda)

Refresh the server cache store in the gattc stack of the remote device. If the device is connected, this API will restart the discovery of service information of the remote device.

Parameters

remote_bda -- [in] remote device BD address.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_cache_assoc(esp_gatt_if_t gattc_if, esp_bd_addr_t src_addr, esp_bd_addr_t assoc_addr, bool is_assoc)

Add or delete the associated address with the source address. Note: The role of this API is mainly when the client side has stored a server-side database, when it needs to connect another device, but the device's attribute database is the same as the server database stored on the client-side, calling this API can use the database that the device has stored used as the peer server database to reduce the attribute database search and discovery process and speed up the connection time. The associated address mains that device want to used the database has stored in the local cache. The source address mains that device want to share the database to the associated address device.

Parameters

gattc_if -- [in] Gatt client access interface.
src_addr -- [in] the source address which provide the attribute table.
assoc_addr -- [in] the associated device address which went to share the attribute table with the source address.
is_assoc -- [in] true add the associated device address, false remove the associated device address.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_cache_get_addr_list(esp_gatt_if_t gattc_if)

Get the address list which has store the attribute table in the gattc cache. There will callback ESP_GATTC_GET_ADDR_LIST_EVT event when get address list complete.

Parameters

gattc_if -- [in] Gatt client access interface.

Returns

ESP_OK: success
other: failed

esp_err_t esp_ble_gattc_cache_clean(esp_bd_addr_t remote_bda)

Clean the service cache of this device in the gattc stack,.

Parameters

remote_bda -- [in] remote device BD address.

Returns

ESP_OK: success
other: failed

Unions

union esp_ble_gattc_cb_param_t

#include <esp_gattc_api.h>

Gatt client callback parameters union.

Public Members

struct esp_ble_gattc_cb_param_t::gattc_reg_evt_param reg: Gatt client callback param of ESP_GATTC_REG_EVT

struct esp_ble_gattc_cb_param_t::gattc_open_evt_param open: Gatt client callback param of ESP_GATTC_OPEN_EVT

struct esp_ble_gattc_cb_param_t::gattc_close_evt_param close: Gatt client callback param of ESP_GATTC_CLOSE_EVT

struct esp_ble_gattc_cb_param_t::gattc_cfg_mtu_evt_param cfg_mtu: Gatt client callback param of ESP_GATTC_CFG_MTU_EVT

struct esp_ble_gattc_cb_param_t::gattc_search_cmpl_evt_param search_cmpl: Gatt client callback param of ESP_GATTC_SEARCH_CMPL_EVT

struct esp_ble_gattc_cb_param_t::gattc_search_res_evt_param search_res: Gatt client callback param of ESP_GATTC_SEARCH_RES_EVT

struct esp_ble_gattc_cb_param_t::gattc_read_char_evt_param read: Gatt client callback param of ESP_GATTC_READ_CHAR_EVT

struct esp_ble_gattc_cb_param_t::gattc_write_evt_param write: Gatt client callback param of ESP_GATTC_WRITE_DESCR_EVT

struct esp_ble_gattc_cb_param_t::gattc_exec_cmpl_evt_param exec_cmpl: Gatt client callback param of ESP_GATTC_EXEC_EVT

struct esp_ble_gattc_cb_param_t::gattc_notify_evt_param notify: Gatt client callback param of ESP_GATTC_NOTIFY_EVT

struct esp_ble_gattc_cb_param_t::gattc_srvc_chg_evt_param srvc_chg: Gatt client callback param of ESP_GATTC_SRVC_CHG_EVT

struct esp_ble_gattc_cb_param_t::gattc_congest_evt_param congest: Gatt client callback param of ESP_GATTC_CONGEST_EVT

struct esp_ble_gattc_cb_param_t::gattc_reg_for_notify_evt_param reg_for_notify: Gatt client callback param of ESP_GATTC_REG_FOR_NOTIFY_EVT

struct esp_ble_gattc_cb_param_t::gattc_unreg_for_notify_evt_param unreg_for_notify: Gatt client callback param of ESP_GATTC_UNREG_FOR_NOTIFY_EVT

struct esp_ble_gattc_cb_param_t::gattc_connect_evt_param connect: Gatt client callback param of ESP_GATTC_CONNECT_EVT

struct esp_ble_gattc_cb_param_t::gattc_disconnect_evt_param disconnect: Gatt client callback param of ESP_GATTC_DISCONNECT_EVT

struct esp_ble_gattc_cb_param_t::gattc_set_assoc_addr_cmp_evt_param set_assoc_cmp: Gatt client callback param of ESP_GATTC_SET_ASSOC_EVT

struct esp_ble_gattc_cb_param_t::gattc_get_addr_list_evt_param get_addr_list: Gatt client callback param of ESP_GATTC_GET_ADDR_LIST_EVT

struct esp_ble_gattc_cb_param_t::gattc_queue_full_evt_param queue_full: Gatt client callback param of ESP_GATTC_QUEUE_FULL_EVT

struct esp_ble_gattc_cb_param_t::gattc_dis_srvc_cmpl_evt_param dis_srvc_cmpl: Gatt client callback param of ESP_GATTC_DIS_SRVC_CMPL_EVT

struct gattc_cfg_mtu_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_CFG_MTU_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

uint16_t mtu: MTU size

struct gattc_close_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_CLOSE_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

esp_bd_addr_t remote_bda: Remote bluetooth device address

esp_gatt_conn_reason_t reason: The reason of gatt connection close

struct gattc_congest_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_CONGEST_EVT.

Public Members

uint16_t conn_id: Connection id

bool congested: Congested or not

struct gattc_connect_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_CONNECT_EVT.

Public Members

uint16_t conn_id: Connection id

uint8_t link_role: Link role : master role = 0 ; slave role = 1

esp_bd_addr_t remote_bda: Remote bluetooth device address

esp_gatt_conn_params_t conn_params: current connection parameters

esp_ble_addr_type_t ble_addr_type: Remote BLE device address type

uint16_t conn_handle: HCI connection handle

struct gattc_dis_srvc_cmpl_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_DIS_SRVC_CMPL_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

struct gattc_disconnect_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_DISCONNECT_EVT.

Public Members

esp_gatt_conn_reason_t reason: disconnection reason

uint16_t conn_id: Connection id

esp_bd_addr_t remote_bda: Remote bluetooth device address

struct gattc_exec_cmpl_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_EXEC_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

struct gattc_get_addr_list_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_GET_ADDR_LIST_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint8_t num_addr: The number of address in the gattc cache address list

esp_bd_addr_t *addr_list: The pointer to the address list which has been get from the gattc cache

struct gattc_notify_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_NOTIFY_EVT.

Public Members

uint16_t conn_id: Connection id

esp_bd_addr_t remote_bda: Remote bluetooth device address

uint16_t handle: The Characteristic or descriptor handle

uint16_t value_len: Notify attribute value

uint8_t *value: Notify attribute value

bool is_notify: True means notify, false means indicate

struct gattc_open_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_OPEN_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

esp_bd_addr_t remote_bda: Remote bluetooth device address

uint16_t mtu: MTU size

struct gattc_queue_full_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_QUEUE_FULL_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

bool is_full: The gattc command queue is full or not

struct gattc_read_char_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_READ_CHAR_EVT, ESP_GATTC_READ_DESCR_EVT, ESP_GATTC_READ_MULTIPLE_EVT, ESP_GATTC_READ_MULTI_VAR_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

uint16_t handle: Characteristic handle

uint8_t *value: Characteristic value

uint16_t value_len: Characteristic value length

struct gattc_reg_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_REG_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t app_id: Application id which input in register API

struct gattc_reg_for_notify_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_REG_FOR_NOTIFY_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t handle: The characteristic or descriptor handle

struct gattc_search_cmpl_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_SEARCH_CMPL_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

esp_service_source_t searched_service_source: The source of the service information

struct gattc_search_res_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_SEARCH_RES_EVT.

Public Members

uint16_t conn_id: Connection id

uint16_t start_handle: Service start handle

uint16_t end_handle: Service end handle

esp_gatt_id_t srvc_id: Service id, include service uuid and other information

bool is_primary: True if this is the primary service

struct gattc_set_assoc_addr_cmp_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_SET_ASSOC_EVT.

Public Members

esp_gatt_status_t status: Operation status

struct gattc_srvc_chg_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_SRVC_CHG_EVT.

Public Members

esp_bd_addr_t remote_bda: Remote bluetooth device address

struct gattc_unreg_for_notify_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_UNREG_FOR_NOTIFY_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t handle: The characteristic or descriptor handle

struct gattc_write_evt_param

#include <esp_gattc_api.h>

ESP_GATTC_WRITE_CHAR_EVT, ESP_GATTC_PREP_WRITE_EVT, ESP_GATTC_WRITE_DESCR_EVT.

Public Members

esp_gatt_status_t status: Operation status

uint16_t conn_id: Connection id

uint16_t handle: The Characteristic or descriptor handle

uint16_t offset: The prepare write offset, this value is valid only when prepare write

Type Definitions

typedef void (*esp_gattc_cb_t)(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)

GATT Client callback function type.

Param event: : Event type
Param gattc_if: : GATT client access interface, normally different gattc_if correspond to different profile
Param param: : Point to callback parameter, currently is union type

Enumerations

enum esp_gattc_cb_event_t

GATT Client callback function events.

Values:

enumerator ESP_GATTC_REG_EVT: When GATT client is registered, the event comes

enumerator ESP_GATTC_UNREG_EVT: When GATT client is unregistered, the event comes

enumerator ESP_GATTC_OPEN_EVT: When GATT virtual connection is set up, the event comes

enumerator ESP_GATTC_READ_CHAR_EVT: When GATT characteristic is read, the event comes

enumerator ESP_GATTC_WRITE_CHAR_EVT: When GATT characteristic write operation completes, the event comes

enumerator ESP_GATTC_CLOSE_EVT: When GATT virtual connection is closed, the event comes

enumerator ESP_GATTC_SEARCH_CMPL_EVT: When GATT service discovery is completed, the event comes

enumerator ESP_GATTC_SEARCH_RES_EVT: When GATT service discovery result is got, the event comes

enumerator ESP_GATTC_READ_DESCR_EVT: When GATT characteristic descriptor read completes, the event comes

enumerator ESP_GATTC_WRITE_DESCR_EVT: When GATT characteristic descriptor write completes, the event comes

enumerator ESP_GATTC_NOTIFY_EVT: When GATT notification or indication arrives, the event comes

enumerator ESP_GATTC_PREP_WRITE_EVT: When GATT prepare-write operation completes, the event comes

enumerator ESP_GATTC_EXEC_EVT: When write execution completes, the event comes

enumerator ESP_GATTC_ACL_EVT: When ACL connection is up, the event comes

enumerator ESP_GATTC_CANCEL_OPEN_EVT: When GATT client ongoing connection is cancelled, the event comes

enumerator ESP_GATTC_SRVC_CHG_EVT: When "service changed" occurs, the event comes

enumerator ESP_GATTC_ENC_CMPL_CB_EVT: When encryption procedure completes, the event comes

enumerator ESP_GATTC_CFG_MTU_EVT: When configuration of MTU completes, the event comes

enumerator ESP_GATTC_ADV_DATA_EVT: When advertising of data, the event comes

enumerator ESP_GATTC_MULT_ADV_ENB_EVT: When multi-advertising is enabled, the event comes

enumerator ESP_GATTC_MULT_ADV_UPD_EVT: When multi-advertising parameters are updated, the event comes

enumerator ESP_GATTC_MULT_ADV_DATA_EVT: When multi-advertising data arrives, the event comes

enumerator ESP_GATTC_MULT_ADV_DIS_EVT: When multi-advertising is disabled, the event comes

enumerator ESP_GATTC_CONGEST_EVT: When GATT connection congestion comes, the event comes

enumerator ESP_GATTC_BTH_SCAN_ENB_EVT: When batch scan is enabled, the event comes

enumerator ESP_GATTC_BTH_SCAN_CFG_EVT: When batch scan storage is configured, the event comes

enumerator ESP_GATTC_BTH_SCAN_RD_EVT: When Batch scan read event is reported, the event comes

enumerator ESP_GATTC_BTH_SCAN_THR_EVT: When Batch scan threshold is set, the event comes

enumerator ESP_GATTC_BTH_SCAN_PARAM_EVT: When Batch scan parameters are set, the event comes

enumerator ESP_GATTC_BTH_SCAN_DIS_EVT: When Batch scan is disabled, the event comes

enumerator ESP_GATTC_SCAN_FLT_CFG_EVT: When Scan filter configuration completes, the event comes

enumerator ESP_GATTC_SCAN_FLT_PARAM_EVT: When Scan filter parameters are set, the event comes

enumerator ESP_GATTC_SCAN_FLT_STATUS_EVT: When Scan filter status is reported, the event comes

enumerator ESP_GATTC_ADV_VSC_EVT: When advertising vendor spec content event is reported, the event comes

enumerator ESP_GATTC_REG_FOR_NOTIFY_EVT: When register for notification of a service completes, the event comes

enumerator ESP_GATTC_UNREG_FOR_NOTIFY_EVT: When unregister for notification of a service completes, the event comes

enumerator ESP_GATTC_CONNECT_EVT: When the ble physical connection is set up, the event comes

enumerator ESP_GATTC_DISCONNECT_EVT: When the ble physical connection disconnected, the event comes

enumerator ESP_GATTC_READ_MULTIPLE_EVT: When the ble characteristic or descriptor multiple complete, the event comes

enumerator ESP_GATTC_QUEUE_FULL_EVT: When the gattc command queue full, the event comes

enumerator ESP_GATTC_SET_ASSOC_EVT: When the ble gattc set the associated address complete, the event comes

enumerator ESP_GATTC_GET_ADDR_LIST_EVT: When the ble get gattc address list in cache finish, the event comes

enumerator ESP_GATTC_DIS_SRVC_CMPL_EVT: When the ble discover service complete, the event comes

enumerator ESP_GATTC_READ_MULTI_VAR_EVT: When read multiple variable characteristic complete, the event comes

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