GATT CLIENT API

Overview

Instructions

Application Example

Check bluetooth folder in ESP-IDF examples, which contains the following application:

  • This is a GATT client demo. This demo can scan devices, connect to the GATT server and discover the service bluetooth/gatt_client

API Reference

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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • callback: : pointer to the application callback function.

esp_err_t esp_ble_gattc_app_register(uint16_t app_id)

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

Return
  • ESP_OK: success
  • other: failed
Parameters
  • app_id: : Application Identify (UUID), for different application

esp_err_t esp_ble_gattc_app_unregister(esp_gatt_if_t gattc_if)

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

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.

esp_err_t esp_ble_gattc_open(esp_gatt_if_t gattc_if, esp_bd_addr_t remote_bda, bool is_direct)

Open a direct connection or add a background auto connection.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • remote_bda: remote device bluetooth device address.
  • is_direct: direct connection or background auto connection

esp_err_t esp_ble_gattc_close(esp_gatt_if_t gattc_if, uint16_t conn_id)

Close a virtual connection to a GATT server. gattc maybe have multiple virtual GATT server connections when multiple app_id registed, 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).

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID to be closed.

esp_err_t esp_ble_gattc_config_mtu(esp_gatt_if_t gattc_if, uint16_t conn_id, uint16_t mtu)

Configure the MTU size in the GATT channel. This can be done only once per connection.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID.
  • mtu: desired MTU size to use.

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 request a GATT service discovery on a GATT server. This function report service search result by a callback event, and followed by a service search complete event.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID.
  • filter_uuid: a UUID of the service application is interested in. If Null, discover for all services.

esp_err_t esp_ble_gattc_get_characteristic(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *start_char_id)

This function is called to find the first characteristic of the service on the given server.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID which identify the server.
  • srvc_id: service ID
  • start_char_id: the start characteristic ID

esp_err_t esp_ble_gattc_get_descriptor(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, esp_gatt_id_t *start_descr_id)

This function is called to find the descriptor of the service on the given server.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID which identify the server.
  • srvc_id: the service ID of which the characteristic is belonged to.
  • char_id: Characteristic ID, if NULL find the first available characteristic.
  • start_descr_id: the start descriptor id

esp_err_t esp_ble_gattc_get_included_service(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_srvc_id_t *start_incl_srvc_id)

This function is called to find the first characteristic of the service on the given server.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: connection ID which identify the server.
  • srvc_id: the service ID of which the characteristic is belonged to.
  • start_incl_srvc_id: the start include service id

esp_err_t esp_ble_gattc_read_char(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, esp_gatt_auth_req_t auth_req)

This function is called to read a service’s characteristics of the given characteristic ID.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • srvc_id: : service ID.
  • char_id: : characteristic ID to read.
  • auth_req: : authenticate request type

esp_err_t esp_ble_gattc_read_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, esp_gatt_id_t *descr_id, esp_gatt_auth_req_t auth_req)

This function is called to read a characteristics descriptor.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • srvc_id: : service ID.
  • char_id: : characteristic ID to read.
  • descr_id: : characteristic descriptor ID to read.
  • auth_req: : authenticate request type

esp_err_t esp_ble_gattc_write_char(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, 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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • srvc_id: : service ID.
  • char_id: : characteristic ID to write.
  • value_len: length of the value to be written.
  • value: : the value to be written.
  • write_type: : the type of attribute write operation.
  • auth_req: : authentication request.

esp_err_t esp_ble_gattc_write_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, esp_gatt_id_t *descr_id, 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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID
  • srvc_id: : service ID.
  • char_id: : characteristic ID.
  • descr_id: : characteristic descriptor ID to write.
  • value_len: length of the value to be written.
  • value: : the value to be written.
  • write_type: : the type of attribute write operation.
  • auth_req: : authentication request.

esp_err_t esp_ble_gattc_prepare_write(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, 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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • srvc_id: : service ID.
  • char_id: : GATT characteristic ID of the service.
  • offset: : offset of the write value.
  • value_len: length of the value to be written.
  • value: : the value to be written.
  • auth_req: : authentication request.

esp_err_t esp_ble_gattc_prepare_write_char_descr(esp_gatt_if_t gattc_if, uint16_t conn_id, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id, esp_gatt_id_t *descr_id, 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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • srvc_id: : service ID.
  • char_id: : GATT characteristic ID of the service.
  • descr_id: : characteristic descriptor ID to write.
  • offset: : offset of the write value.
  • value_len: length of the value to be written.
  • value: : the value to be written.
  • auth_req: : authentication request.

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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • conn_id: : connection ID.
  • is_execute: : execute or cancel.

esp_gatt_status_t esp_ble_gattc_register_for_notify(esp_gatt_if_t gattc_if, esp_bd_addr_t server_bda, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id)

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

Return
  • ESP_OK: registration succeeds
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • server_bda: : target GATT server.
  • srvc_id: : pointer to GATT service ID.
  • char_id: : pointer to GATT characteristic ID.

esp_gatt_status_t esp_ble_gattc_unregister_for_notify(esp_gatt_if_t gattc_if, esp_bd_addr_t server_bda, esp_gatt_srvc_id_t *srvc_id, esp_gatt_id_t *char_id)

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

Return
  • ESP_OK: unregister succeeds
  • other: failed
Parameters
  • gattc_if: Gatt client access interface.
  • server_bda: : target GATT server.
  • srvc_id: : pointer to GATT service ID.
  • char_id: : pointer to GATT characteristic ID.

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.

Return
  • ESP_OK: success
  • other: failed
Parameters
  • remote_bda: remote device BD address.

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_get_char_evt_param get_char

Gatt client callback param of ESP_GATTC_GET_CHAR_EVT

struct esp_ble_gattc_cb_param_t::gattc_get_descr_evt_param get_descr

Gatt client callback param of ESP_GATTC_GET_DESCR_EVT

struct esp_ble_gattc_cb_param_t::gattc_get_incl_srvc_evt_param get_incl_srvc

Gatt client callback param of ESP_GATTC_GET_INCL_SRVC_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 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

esp_gatt_status_t status

Operation status

uint16_t conn_id

Connection id

esp_bd_addr_t remote_bda

Remote bluetooth device address

struct gattc_disconnect_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_DISCONNECT_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

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_char_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_GET_CHAR_EVT.

Public Members

esp_gatt_status_t status

Operation status

uint16_t conn_id

Connection id

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

esp_gatt_char_prop_t char_prop

Characteristic property

struct gattc_get_descr_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_GET_DESCR_EVT.

Public Members

esp_gatt_status_t status

Operation status

uint16_t conn_id

Connection id

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

esp_gatt_id_t descr_id

Descriptor id, include descriptor uuid and other information

struct gattc_get_incl_srvc_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_GET_INCL_SRVC_EVT.

Public Members

esp_gatt_status_t status

Operation status

uint16_t conn_id

Connection id

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_srvc_id_t incl_srvc_id

Included service id, include service uuid and other information

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

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

esp_gatt_id_t descr_id

Descriptor id, include descriptor uuid and other information

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_read_char_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_READ_CHAR_EVT, ESP_GATTC_READ_DESCR_EVT.

Public Members

esp_gatt_status_t status

Operation status

uint16_t conn_id

Connection id

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

esp_gatt_id_t descr_id

Descriptor id, include descriptor uuid and other information

uint8_t *value

Characteristic value

uint16_t value_type

Characteristic value type, there is two value for this type: ESP_GATTC_READ_VALUE_TYPE_VALUE(0x0000) and ESP_GATTC_READ_VALUE_TYPE_AGG_FORMAT(0x2905). If the value is ESP_GATTC_READ_VALUE_TYPE_VALUE means it is a generally value type, and if is the type of ESP_GATTC_READ_VALUE_TYPE_AGG_FORMAT, the unit of the value will indicate in the Characteristic aggregate format descriptor

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

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

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

struct gattc_search_res_evt_param
#include <esp_gattc_api.h>

ESP_GATTC_SEARCH_RES_EVT.

Public Members

uint16_t conn_id

Connection id

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

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

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

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

esp_gatt_srvc_id_t srvc_id

Service id, include service uuid and other information

esp_gatt_id_t char_id

Characteristic id, include characteristic uuid and other information

esp_gatt_id_t descr_id

Descriptor id, include descriptor uuid and other information

Macros

ESP_GATT_DEF_BLE_MTU_SIZE

Maximum Transmission Unit used in GATT.

ESP_GATT_MAX_MTU_SIZE

Maximum Transmission Unit allowed in GATT.

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.

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

Enumerations

enum esp_gattc_cb_event_t

GATT Client callback function events.

Values:

ESP_GATTC_REG_EVT = 0

When GATT client is registered, the event comes

ESP_GATTC_UNREG_EVT = 1

When GATT client is unregistered, the event comes

ESP_GATTC_OPEN_EVT = 2

When GATT virtual connection is set up, the event comes

ESP_GATTC_READ_CHAR_EVT = 3

When GATT characteristic is read, the event comes

ESP_GATTC_WRITE_CHAR_EVT = 4

When GATT characteristic write operation completes, the event comes

ESP_GATTC_CLOSE_EVT = 5

When GATT virtual connection is closed, the event comes

ESP_GATTC_SEARCH_CMPL_EVT = 6

When GATT service discovery is completed, the event comes

ESP_GATTC_SEARCH_RES_EVT = 7

When GATT service discovery result is got, the event comes

ESP_GATTC_READ_DESCR_EVT = 8

When GATT characteristic descriptor read completes, the event comes

ESP_GATTC_WRITE_DESCR_EVT = 9

When GATT characteristic descriptor write completes, the event comes

ESP_GATTC_NOTIFY_EVT = 10

When GATT notification or indication arrives, the event comes

ESP_GATTC_PREP_WRITE_EVT = 11

When GATT prepare-write operation completes, the event comes

ESP_GATTC_EXEC_EVT = 12

When write execution completes, the event comes

ESP_GATTC_ACL_EVT = 13

When ACL connection is up, the event comes

ESP_GATTC_CANCEL_OPEN_EVT = 14

When GATT client ongoing connection is cancelled, the event comes

ESP_GATTC_SRVC_CHG_EVT = 15

When “service changed” occurs, the event comes

ESP_GATTC_ENC_CMPL_CB_EVT = 17

When encryption procedure completes, the event comes

ESP_GATTC_CFG_MTU_EVT = 18

When configuration of MTU completes, the event comes

ESP_GATTC_ADV_DATA_EVT = 19

When advertising of data, the event comes

ESP_GATTC_MULT_ADV_ENB_EVT = 20

When multi-advertising is enabled, the event comes

ESP_GATTC_MULT_ADV_UPD_EVT = 21

When multi-advertising parameters are updated, the event comes

ESP_GATTC_MULT_ADV_DATA_EVT = 22

When multi-advertising data arrives, the event comes

ESP_GATTC_MULT_ADV_DIS_EVT = 23

When multi-advertising is disabled, the event comes

ESP_GATTC_CONGEST_EVT = 24

When GATT connection congestion comes, the event comes

ESP_GATTC_BTH_SCAN_ENB_EVT = 25

When batch scan is enabled, the event comes

ESP_GATTC_BTH_SCAN_CFG_EVT = 26

When batch scan storage is configured, the event comes

ESP_GATTC_BTH_SCAN_RD_EVT = 27

When Batch scan read event is reported, the event comes

ESP_GATTC_BTH_SCAN_THR_EVT = 28

When Batch scan threshold is set, the event comes

ESP_GATTC_BTH_SCAN_PARAM_EVT = 29

When Batch scan parameters are set, the event comes

ESP_GATTC_BTH_SCAN_DIS_EVT = 30

When Batch scan is disabled, the event comes

ESP_GATTC_SCAN_FLT_CFG_EVT = 31

When Scan filter configuration completes, the event comes

ESP_GATTC_SCAN_FLT_PARAM_EVT = 32

When Scan filter parameters are set, the event comes

ESP_GATTC_SCAN_FLT_STATUS_EVT = 33

When Scan filter status is reported, the event comes

ESP_GATTC_ADV_VSC_EVT = 34

When advertising vendor spec content event is reported, the event comes

ESP_GATTC_GET_CHAR_EVT = 35

When characteristic is got from GATT server, the event comes

ESP_GATTC_GET_DESCR_EVT = 36

When characteristic descriptor is got from GATT server, the event comes

ESP_GATTC_GET_INCL_SRVC_EVT = 37

When included service is got from GATT server, the event comes

ESP_GATTC_REG_FOR_NOTIFY_EVT = 38

When register for notification of a service completes, the event comes

ESP_GATTC_UNREG_FOR_NOTIFY_EVT = 39

When unregister for notification of a service completes, the event comes

ESP_GATTC_CONNECT_EVT = 40

When the ble physical connection is set up, the event comes

ESP_GATTC_DISCONNECT_EVT = 41

When the ble physical connection disconnected, the event comes