CLASSIC BLUETOOTH GAP API

Overview

Instructions

Application Example

Instructions

API Reference

Functions

uint32_t esp_bt_gap_get_cod_srvc(uint32_t cod)

get major service field of COD

Return
major service bits
Parameters
  • cod: Class of Device

uint32_t esp_bt_gap_get_cod_major_dev(uint32_t cod)

get major device field of COD

Return
major device bits
Parameters
  • cod: Class of Device

uint32_t esp_bt_gap_get_cod_minor_dev(uint32_t cod)

get minor service field of COD

Return
minor service bits
Parameters
  • cod: Class of Device

uint32_t esp_bt_gap_get_cod_format_type(uint32_t cod)

get format type of COD

Return
format type
Parameters
  • cod: Class of Device

bool esp_bt_gap_is_valid_cod(uint32_t cod)

decide the integrity of COD

Return
  • true if cod is valid
  • false otherise
Parameters
  • cod: Class of Device

esp_err_t esp_bt_gap_register_callback(esp_bt_gap_cb_t callback)

register callback function. This function should be called after esp_bluedroid_enable() completes successfully

Return
  • ESP_OK : Succeed
  • ESP_FAIL: others

esp_err_t esp_bt_gap_set_scan_mode(esp_bt_scan_mode_t mode)

Set discoverability and connectability mode for legacy bluetooth. This function should be called after esp_bluedroid_enable() completes successfully.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_ARG: if argument invalid
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_FAIL: others
Parameters
  • mode: : one of the enums of bt_scan_mode_t

esp_err_t esp_bt_gap_start_discovery(esp_bt_inq_mode_t mode, uint8_t inq_len, uint8_t num_rsps)

Start device discovery. This function should be called after esp_bluedroid_enable() completes successfully. esp_bt_gap_cb_t will is called with ESP_BT_GAP_DISC_STATE_CHANGED_EVT if discovery is started or halted. esp_bt_gap_cb_t will is called with ESP_BT_GAP_DISC_RES_EVT if discovery result is got.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_ERR_INVALID_ARG: if invalid parameters are provided
  • ESP_FAIL: others
Parameters
  • mode: - inquiry mode
  • inq_len: - inquiry duration in 1.28 sec units, ranging from 0x01 to 0x30
  • num_rsps: - number of inquiry responses that can be received, value 0 indicates an unlimited number of responses

esp_err_t esp_bt_gap_cancel_discovery(void)

Cancel device discovery. This function should be called after esp_bluedroid_enable() completes successfully esp_bt_gap_cb_t will is called with ESP_BT_GAP_DISC_STATE_CHANGED_EVT if discovery is stopped.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_FAIL: others

esp_err_t esp_bt_gap_get_remote_services(esp_bd_addr_t remote_bda)

Start SDP to get remote services. This function should be called after esp_bluedroid_enable() completes successfully. esp_bt_gap_cb_t will is called with ESP_BT_GAP_RMT_SRVCS_EVT after service discovery ends.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_FAIL: others

esp_err_t esp_bt_gap_get_remote_service_record(esp_bd_addr_t remote_bda, esp_bt_uuid_t *uuid)

Start SDP to look up the service matching uuid on the remote device. This function should be called after esp_bluedroid_enable() completes successfully.

esp_bt_gap_cb_t will is called with ESP_BT_GAP_RMT_SRVC_REC_EVT after service discovery ends

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_FAIL: others

uint8_t *esp_bt_gap_resolve_eir_data(uint8_t *eir, esp_bt_eir_type_t type, uint8_t *length)

This function is called to get EIR data for a specific type.

Return
pointer of starting position of eir data excluding eir data type, NULL if not found
Parameters
  • eir: - pointer of raw eir data to be resolved
  • type: - specific EIR data type
  • length: - return the length of EIR data excluding fields of length and data type

esp_err_t esp_bt_gap_set_cod(esp_bt_cod_t cod, esp_bt_cod_mode_t mode)

This function is called to set class of device. esp_bt_gap_cb_t will is called with ESP_BT_GAP_SET_COD_EVT after set COD ends Some profile have special restrictions on class of device, changes may cause these profile do not work.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_ERR_INVALID_ARG: if param is invalid
  • ESP_FAIL: others
Parameters
  • cod: - class of device
  • mode: - setting mode

esp_err_t esp_bt_gap_get_cod(esp_bt_cod_t *cod)

This function is called to get class of device.

Return
  • ESP_OK : Succeed
  • ESP_FAIL: others
Parameters
  • cod: - class of device

esp_err_t esp_bt_gap_read_rssi_delta(esp_bd_addr_t remote_addr)

This function is called to read RSSI delta by address after connected. The RSSI value returned by ESP_BT_GAP_READ_RSSI_DELTA_EVT.

Return
  • ESP_OK : Succeed
  • ESP_FAIL: others
Parameters
  • remote_addr: - remote device address, corresponding to a certain connection handle.

esp_err_t esp_bt_gap_remove_bond_device(esp_bd_addr_t bd_addr)

Removes a device from the security database list of peer device.

Return
- ESP_OK : success
  • ESP_FAIL : failed
Parameters
  • bd_addr: : BD address of the peer device

int esp_bt_gap_get_bond_device_num(void)

Get the device number from the security database list of peer device. It will return the device bonded number immediately.

Return
- >= 0 : bonded devices number.
  • ESP_FAIL : failed

esp_err_t esp_bt_gap_get_bond_device_list(int *dev_num, esp_bd_addr_t *dev_list)

Get the device from the security database list of peer device. It will return the device bonded information immediately.

Return
  • ESP_OK : Succeed
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • ESP_FAIL: others
Parameters
  • dev_num: Indicate the dev_list array(buffer) size as input. If dev_num is large enough, it means the actual number as output. Suggest that dev_num value equal to esp_ble_get_bond_device_num().
  • dev_list: an array(buffer) of esp_bd_addr_t type. Use for storing the bonded devices address. The dev_list should be allocated by who call this API.

esp_err_t esp_bt_gap_set_security_param(esp_bt_sp_param_t param_type, void *value, uint8_t len)

Set a GAP security parameter value. Overrides the default value.

Return
- ESP_OK : success
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • other : failed
Parameters
  • param_type: : the type of the param which is to be set
  • value: : the param value
  • len: : the length of the param value

esp_err_t esp_bt_gap_ssp_passkey_reply(esp_bd_addr_t bd_addr, bool accept, uint32_t passkey)

Reply the key value to the peer device in the legacy connection stage.

Return
- ESP_OK : success
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • other : failed
Parameters
  • bd_addr: : BD address of the peer
  • accept: : passkey entry sucessful or declined.
  • passkey: : passkey value, must be a 6 digit number, can be lead by 0.

esp_err_t esp_bt_gap_ssp_confirm_reply(esp_bd_addr_t bd_addr, bool accept)

Reply the confirm value to the peer device in the legacy connection stage.

Return
- ESP_OK : success
  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled
  • other : failed
Parameters
  • bd_addr: : BD address of the peer device
  • accept: : numbers to compare are the same or different.

Unions

union esp_bt_gap_cb_param_t
#include <esp_gap_bt_api.h>

A2DP state callback parameters.

Public Members

struct esp_bt_gap_cb_param_t::disc_res_param disc_res

discovery result paramter struct

struct esp_bt_gap_cb_param_t::disc_state_changed_param disc_st_chg

discovery state changed parameter struct

struct esp_bt_gap_cb_param_t::rmt_srvcs_param rmt_srvcs

services of remote device parameter struct

struct esp_bt_gap_cb_param_t::rmt_srvc_rec_param rmt_srvc_rec

specific service record from remote device parameter struct

struct esp_bt_gap_cb_param_t::read_rssi_delta_param read_rssi_delta

read rssi parameter struct

struct esp_bt_gap_cb_param_t::auth_cmpl_param auth_cmpl

authentication complete parameter struct

struct esp_bt_gap_cb_param_t::cfm_req_param cfm_req

confirm request parameter struct

struct esp_bt_gap_cb_param_t::key_notif_param key_notif

passkey notif parameter struct

struct esp_bt_gap_cb_param_t::key_req_param key_req

passkey request parameter struct

struct auth_cmpl_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_AUTH_CMPL_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

esp_bt_status_t stat

authentication complete status

uint8_t device_name[ESP_BT_GAP_MAX_BDNAME_LEN+1]

device name

struct cfm_req_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_CFM_REQ_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

uint32_t num_val

the numeric value for comparison.

struct disc_res_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_DISC_RES_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

int num_prop

number of properties got

esp_bt_gap_dev_prop_t *prop

properties discovered from the new device

struct disc_state_changed_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_DISC_STATE_CHANGED_EVT.

Public Members

esp_bt_gap_discovery_state_t state

discovery state

struct key_notif_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_KEY_NOTIF_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

uint32_t passkey

the numeric value for passkey entry.

struct key_req_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_KEY_REQ_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

struct read_rssi_delta_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_READ_RSSI_DELTA_EVT *.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

esp_bt_status_t stat

read rssi status

int8_t rssi_delta

rssi delta value range -128 ~127, The value zero indicates that the RSSI is inside the Golden Receive Power Range, the Golden Receive Power Range is from ESP_BT_GAP_RSSI_LOW_THRLD to ESP_BT_GAP_RSSI_HIGH_THRLD

struct rmt_srvc_rec_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_RMT_SRVC_REC_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

esp_bt_status_t stat

service search status

struct rmt_srvcs_param
#include <esp_gap_bt_api.h>

ESP_BT_GAP_RMT_SRVCS_EVT.

Public Members

esp_bd_addr_t bda

remote bluetooth device address

esp_bt_status_t stat

service search status

int num_uuids

number of UUID in uuid_list

esp_bt_uuid_t *uuid_list

list of service UUIDs of remote device

Structures

struct esp_bt_cod_t

Class of device.

Public Members

uint32_t reserved_2

undefined

uint32_t minor

minor class

uint32_t major

major class

uint32_t service

service class

uint32_t reserved_8

undefined

struct esp_bt_gap_dev_prop_t

Bluetooth Device Property Descriptor.

Public Members

esp_bt_gap_dev_prop_type_t type

device property type

int len

device property value length

void *val

devlice prpoerty value

Macros

ESP_BT_GAP_RSSI_HIGH_THRLD

RSSI threshold.

High RSSI threshold

ESP_BT_GAP_RSSI_LOW_THRLD

Low RSSI threshold

ESP_BT_GAP_MAX_BDNAME_LEN

Maximum bytes of Bluetooth device name.

ESP_BT_GAP_EIR_DATA_LEN

Maximum size of EIR Significant part.

ESP_BT_IO_CAP_OUT
ESP_BT_IO_CAP_IO
ESP_BT_IO_CAP_IN
ESP_BT_IO_CAP_NONE
ESP_BT_COD_SRVC_BIT_MASK

Bits of major service class field.

Major service bit mask

ESP_BT_COD_SRVC_BIT_OFFSET

Major service bit offset

ESP_BT_COD_MAJOR_DEV_BIT_MASK

Bits of major device class field.

Major device bit mask

ESP_BT_COD_MAJOR_DEV_BIT_OFFSET

Major device bit offset

ESP_BT_COD_MINOR_DEV_BIT_MASK

Bits of minor device class field.

Minor device bit mask

ESP_BT_COD_MINOR_DEV_BIT_OFFSET

Minor device bit offset

ESP_BT_COD_FORMAT_TYPE_BIT_MASK

Bits of format type.

Format type bit mask

ESP_BT_COD_FORMAT_TYPE_BIT_OFFSET

Format type bit offset

ESP_BT_COD_FORMAT_TYPE_1

Class of device format type 1.

ESP_BT_GAP_MIN_INQ_LEN

Minimum and Maximum inquiry length Minimum inquiry duration, unit is 1.28s

ESP_BT_GAP_MAX_INQ_LEN

Maximum inquiry duration, unit is 1.28s

Type Definitions

typedef uint8_t esp_bt_io_cap_t

combination of the io capability

typedef void (*esp_bt_gap_cb_t)(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)

bluetooth GAP callback function type

Parameters
  • event: : Event type
  • param: : Pointer to callback parameter

Enumerations

enum esp_bt_cod_mode_t

class of device settings

Values:

ESP_BT_SET_COD_MAJOR_MINOR = 0x01

overwrite major, minor class

ESP_BT_SET_COD_SERVICE_CLASS = 0x02

set the bits in the input, the current bit will remain

ESP_BT_CLR_COD_SERVICE_CLASS = 0x04

clear the bits in the input, others will remain

ESP_BT_SET_COD_ALL = 0x08

overwrite major, minor, set the bits in service class

ESP_BT_INIT_COD = 0x0a

overwrite major, minor, and service class

enum esp_bt_scan_mode_t

Discoverability and Connectability mode.

Values:

ESP_BT_SCAN_MODE_NONE = 0

Neither discoverable nor connectable

ESP_BT_SCAN_MODE_CONNECTABLE

Connectable but not discoverable

ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE

both discoverable and connectable

enum esp_bt_gap_dev_prop_type_t

Bluetooth Device Property type.

Values:

ESP_BT_GAP_DEV_PROP_BDNAME = 1

Bluetooth device name, value type is int8_t []

ESP_BT_GAP_DEV_PROP_COD

Class of Device, value type is uint32_t

ESP_BT_GAP_DEV_PROP_RSSI

Received Signal strength Indication, value type is int8_t, ranging from -128 to 127

ESP_BT_GAP_DEV_PROP_EIR

Extended Inquiry Response, value type is uint8_t []

enum esp_bt_eir_type_t

Extended Inquiry Response data type.

Values:

ESP_BT_EIR_TYPE_FLAGS = 0x01

Flag with information such as BR/EDR and LE support

ESP_BT_EIR_TYPE_INCMPL_16BITS_UUID = 0x02

Incomplete list of 16-bit service UUIDs

ESP_BT_EIR_TYPE_CMPL_16BITS_UUID = 0x03

Complete list of 16-bit service UUIDs

ESP_BT_EIR_TYPE_INCMPL_32BITS_UUID = 0x04

Incomplete list of 32-bit service UUIDs

ESP_BT_EIR_TYPE_CMPL_32BITS_UUID = 0x05

Complete list of 32-bit service UUIDs

ESP_BT_EIR_TYPE_INCMPL_128BITS_UUID = 0x06

Incomplete list of 128-bit service UUIDs

ESP_BT_EIR_TYPE_CMPL_128BITS_UUID = 0x07

Complete list of 128-bit service UUIDs

ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME = 0x08

Shortened Local Name

ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME = 0x09

Complete Local Name

ESP_BT_EIR_TYPE_TX_POWER_LEVEL = 0x0a

Tx power level, value is 1 octet ranging from -127 to 127, unit is dBm

ESP_BT_EIR_TYPE_MANU_SPECIFIC = 0xff

Manufacturer specific data

enum esp_bt_cod_srvc_t

Major service class field of Class of Device, mutiple bits can be set.

Values:

ESP_BT_COD_SRVC_NONE = 0

None indicates an invalid value

ESP_BT_COD_SRVC_LMTD_DISCOVER = 0x1

Limited Discoverable Mode

ESP_BT_COD_SRVC_POSITIONING = 0x8

Positioning (Location identification)

ESP_BT_COD_SRVC_NETWORKING = 0x10

Networking, e.g. LAN, Ad hoc

ESP_BT_COD_SRVC_RENDERING = 0x20

Rendering, e.g. Printing, Speakers

ESP_BT_COD_SRVC_CAPTURING = 0x40

Capturing, e.g. Scanner, Microphone

ESP_BT_COD_SRVC_OBJ_TRANSFER = 0x80

Object Transfer, e.g. v-Inbox, v-Folder

ESP_BT_COD_SRVC_AUDIO = 0x100

Audio, e.g. Speaker, Microphone, Headerset service

ESP_BT_COD_SRVC_TELEPHONY = 0x200

Telephony, e.g. Cordless telephony, Modem, Headset service

ESP_BT_COD_SRVC_INFORMATION = 0x400

Information, e.g., WEB-server, WAP-server

enum esp_bt_sp_param_t

Values:

ESP_BT_SP_IOCAP_MODE = 0

Set IO mode

enum esp_bt_cod_major_dev_t

Major device class field of Class of Device.

Values:

ESP_BT_COD_MAJOR_DEV_MISC = 0

Miscellaneous

ESP_BT_COD_MAJOR_DEV_COMPUTER = 1

Computer

ESP_BT_COD_MAJOR_DEV_PHONE = 2

Phone(cellular, cordless, pay phone, modem

ESP_BT_COD_MAJOR_DEV_LAN_NAP = 3

LAN, Network Access Point

ESP_BT_COD_MAJOR_DEV_AV = 4

Audio/Video(headset, speaker, stereo, video display, VCR

ESP_BT_COD_MAJOR_DEV_PERIPHERAL = 5

Peripheral(mouse, joystick, keyboard)

ESP_BT_COD_MAJOR_DEV_IMAGING = 6

Imaging(printer, scanner, camera, display

ESP_BT_COD_MAJOR_DEV_WEARABLE = 7

Wearable

ESP_BT_COD_MAJOR_DEV_TOY = 8

Toy

ESP_BT_COD_MAJOR_DEV_HEALTH = 9

Health

ESP_BT_COD_MAJOR_DEV_UNCATEGORIZED = 31

Uncategorized: device not specified

enum esp_bt_gap_discovery_state_t

Bluetooth Device Discovery state

Values:

ESP_BT_GAP_DISCOVERY_STOPPED

device discovery stopped

ESP_BT_GAP_DISCOVERY_STARTED

device discovery started

enum esp_bt_gap_cb_event_t

BT GAP callback events.

Values:

ESP_BT_GAP_DISC_RES_EVT = 0

device discovery result event

ESP_BT_GAP_DISC_STATE_CHANGED_EVT

discovery state changed event

ESP_BT_GAP_RMT_SRVCS_EVT

get remote services event

ESP_BT_GAP_RMT_SRVC_REC_EVT

get remote service record event

ESP_BT_GAP_AUTH_CMPL_EVT

AUTH complete event

ESP_BT_GAP_CFM_REQ_EVT

Simple Pairing User Confirmation request.

ESP_BT_GAP_KEY_NOTIF_EVT

Simple Pairing Passkey Notification

ESP_BT_GAP_KEY_REQ_EVT

Simple Pairing Passkey request

ESP_BT_GAP_READ_RSSI_DELTA_EVT

read rssi event

ESP_BT_GAP_EVT_MAX
enum esp_bt_inq_mode_t

Inquiry Mode

Values:

ESP_BT_INQ_MODE_GENERAL_INQUIRY

General inquiry mode

ESP_BT_INQ_MODE_LIMITED_INQUIRY

Limited inquiry mode