SPP API

Application Example

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

This is a SPP demo. This demo can discover the service, connect, send and recive SPP data bluetooth/bluedroid/classic_bt/bt_spp_acceptor, bluetooth/bluedroid/classic_bt/bt_spp_initiator

API Reference

Header File

components/bt/host/bluedroid/api/include/api/esp_spp_api.h

Functions

esp_err_t esp_spp_register_callback(esp_spp_cb_t callback)

This function is called to init callbacks with SPP module.

参数

callback – [in] pointer to the init callback function.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_init(esp_spp_mode_t mode)

This function is called to init SPP module. When the operation is completed, the callback function will be called with ESP_SPP_INIT_EVT. This function should be called after esp_bluedroid_enable() completes successfully.

参数

mode – [in] Choose the mode of SPP, ESP_SPP_MODE_CB or ESP_SPP_MODE_VFS.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_deinit(void)

This function is called to uninit SPP module. The operation will close all active SPP connection first, then the callback function will be called with ESP_SPP_CLOSE_EVT, and the number of ESP_SPP_CLOSE_EVT is equal to the number of connection. When the operation is completed, the callback function will be called with ESP_SPP_UNINIT_EVT. This function should be called after esp_spp_init() completes successfully.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_start_discovery(esp_bd_addr_t bd_addr)

This function is called to performs service discovery for the services provided by the given peer device. When the operation is completed, the callback function will be called with ESP_SPP_DISCOVERY_COMP_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

参数

bd_addr – [in] Remote device bluetooth device address.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_connect(esp_spp_sec_t sec_mask, esp_spp_role_t role, uint8_t remote_scn, esp_bd_addr_t peer_bd_addr)

This function makes an SPP connection to a remote BD Address. When the connection is initiated or failed to initiate, the callback is called with ESP_SPP_CL_INIT_EVT. When the connection is established or failed, the callback is called with ESP_SPP_OPEN_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

参数

sec_mask – [in] Security Setting Mask. Suggest to use ESP_SPP_SEC_NONE, ESP_SPP_SEC_AUTHORIZE or ESP_SPP_SEC_AUTHENTICATE only.
role – [in] Master or slave.
remote_scn – [in] Remote device bluetooth device SCN.
peer_bd_addr – [in] Remote device bluetooth device address.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_disconnect(uint32_t handle)

This function closes an SPP connection. When the operation is completed, the callback function will be called with ESP_SPP_CLOSE_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

参数

handle – [in] The connection handle.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_start_srv(esp_spp_sec_t sec_mask, esp_spp_role_t role, uint8_t local_scn, const char *name)

This function create a SPP server and starts listening for an SPP connection request from a remote Bluetooth device. When the server is started successfully, the callback is called with ESP_SPP_START_EVT. When the connection is established, the callback is called with ESP_SPP_SRV_OPEN_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

参数

sec_mask – [in] Security Setting Mask. Suggest to use ESP_SPP_SEC_NONE, ESP_SPP_SEC_AUTHORIZE or ESP_SPP_SEC_AUTHENTICATE only.
role – [in] Master or slave.
local_scn – [in] The specific channel you want to get. If channel is 0, means get any channel.
name – [in] Server’s name.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_stop_srv(void)

This function stops all SPP servers. The operation will close all active SPP connection first, then the callback function will be called with ESP_SPP_CLOSE_EVT, and the number of ESP_SPP_CLOSE_EVT is equal to the number of connection. When the operation is completed, the callback is called with ESP_SPP_SRV_STOP_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_stop_srv_scn(uint8_t scn)

This function stops a specific SPP server. The operation will close all active SPP connection first on the specific SPP server, then the callback function will be called with ESP_SPP_CLOSE_EVT, and the number of ESP_SPP_CLOSE_EVT is equal to the number of connection. When the operation is completed, the callback is called with ESP_SPP_SRV_STOP_EVT. This funciton must be called after esp_spp_init() successful and before esp_spp_deinit().

参数

scn – [in] Server channel number.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_write(uint32_t handle, int len, uint8_t *p_data)

This function is used to write data, only for ESP_SPP_MODE_CB. When this function need to be called repeatedly, it is strongly recommended to call this function again after the previous event ESP_SPP_WRITE_EVT is received and the parameter ‘cong’ is equal to false. If the previous event ESP_SPP_WRITE_EVT with parameter ‘cong’ is equal to true, the function can only be called again when the event ESP_SPP_CONG_EVT with parameter ‘cong’ equal to false is received. This funciton must be called after an connection between initiator and acceptor has been established.

参数

handle – [in] The connection handle.
len – [in] The length of the data written.
p_data – [in] The data written.

返回

ESP_OK: success
other: failed

esp_err_t esp_spp_vfs_register(void)

This function is used to register VFS. For now, SPP only supports write, read and close.

返回

ESP_OK: success
other: failed

Unions

union esp_spp_cb_param_t

#include <esp_spp_api.h>

SPP callback parameters union.

Public Members

struct esp_spp_cb_param_t::spp_init_evt_param init: SPP callback param of SPP_INIT_EVT

struct esp_spp_cb_param_t::spp_uninit_evt_param uninit: SPP callback param of SPP_UNINIT_EVT

struct esp_spp_cb_param_t::spp_discovery_comp_evt_param disc_comp: SPP callback param of SPP_DISCOVERY_COMP_EVT

struct esp_spp_cb_param_t::spp_open_evt_param open: SPP callback param of ESP_SPP_OPEN_EVT

struct esp_spp_cb_param_t::spp_srv_open_evt_param srv_open: SPP callback param of ESP_SPP_SRV_OPEN_EVT

struct esp_spp_cb_param_t::spp_close_evt_param close: SPP callback param of ESP_SPP_CLOSE_EVT

struct esp_spp_cb_param_t::spp_start_evt_param start: SPP callback param of ESP_SPP_START_EVT

struct esp_spp_cb_param_t::spp_srv_stop_evt_param srv_stop: SPP callback param of ESP_SPP_SRV_STOP_EVT

struct esp_spp_cb_param_t::spp_cl_init_evt_param cl_init: SPP callback param of ESP_SPP_CL_INIT_EVT

struct esp_spp_cb_param_t::spp_write_evt_param write: SPP callback param of ESP_SPP_WRITE_EVT

struct esp_spp_cb_param_t::spp_data_ind_evt_param data_ind: SPP callback param of ESP_SPP_DATA_IND_EVT

struct esp_spp_cb_param_t::spp_cong_evt_param cong: SPP callback param of ESP_SPP_CONG_EVT

struct spp_cl_init_evt_param

#include <esp_spp_api.h>

ESP_SPP_CL_INIT_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

uint8_t sec_id: security ID used by this server

bool use_co: TRUE to use co_rfc_data

struct spp_close_evt_param

#include <esp_spp_api.h>

ESP_SPP_CLOSE_EVT.

Public Members

esp_spp_status_t status: status

uint32_t port_status: PORT status

uint32_t handle: The connection handle

bool async: FALSE, if local initiates disconnect

struct spp_cong_evt_param

#include <esp_spp_api.h>

ESP_SPP_CONG_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

bool cong: TRUE, congested. FALSE, uncongested

struct spp_data_ind_evt_param

#include <esp_spp_api.h>

ESP_SPP_DATA_IND_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

uint16_t len: The length of data

uint8_t *data: The data received

struct spp_discovery_comp_evt_param

#include <esp_spp_api.h>

SPP_DISCOVERY_COMP_EVT.

Public Members

esp_spp_status_t status: status

uint8_t scn_num: The num of scn_num

uint8_t scn[31]: channel #

const char *service_name[31]: service_name

struct spp_init_evt_param

#include <esp_spp_api.h>

SPP_INIT_EVT.

Public Members

esp_spp_status_t status: status

struct spp_open_evt_param

#include <esp_spp_api.h>

ESP_SPP_OPEN_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

int fd: The file descriptor only for ESP_SPP_MODE_VFS

esp_bd_addr_t rem_bda: The peer address

struct spp_srv_open_evt_param

#include <esp_spp_api.h>

ESP_SPP_SRV_OPEN_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

uint32_t new_listen_handle: The new listen handle

int fd: The file descriptor only for ESP_SPP_MODE_VFS

esp_bd_addr_t rem_bda: The peer address

struct spp_srv_stop_evt_param

#include <esp_spp_api.h>

ESP_SPP_SRV_STOP_EVT.

Public Members

esp_spp_status_t status: status

uint8_t scn: Server channel number

struct spp_start_evt_param

#include <esp_spp_api.h>

ESP_SPP_START_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

uint8_t sec_id: security ID used by this server

uint8_t scn: Server channel number

bool use_co: TRUE to use co_rfc_data

struct spp_uninit_evt_param

#include <esp_spp_api.h>

SPP_UNINIT_EVT.

Public Members

esp_spp_status_t status: status

struct spp_write_evt_param

#include <esp_spp_api.h>

ESP_SPP_WRITE_EVT.

Public Members

esp_spp_status_t status: status

uint32_t handle: The connection handle

int len: The length of the data written.

bool cong: congestion status

Macros

ESP_SPP_SEC_NONE: No security. relate to BTA_SEC_NONE in bta/bta_api.h

ESP_SPP_SEC_AUTHORIZE: Authorization required (only needed for out going connection ) relate to BTA_SEC_AUTHORIZE in bta/bta_api.h

ESP_SPP_SEC_AUTHENTICATE: Authentication required. relate to BTA_SEC_AUTHENTICATE in bta/bta_api.h

ESP_SPP_SEC_ENCRYPT: Encryption required. relate to BTA_SEC_ENCRYPT in bta/bta_api.h

ESP_SPP_SEC_MODE4_LEVEL4: Mode 4 level 4 service, i.e. incoming/outgoing MITM and P-256 encryption relate to BTA_SEC_MODE4_LEVEL4 in bta/bta_api.h

ESP_SPP_SEC_MITM: Man-In-The_Middle protection relate to BTA_SEC_MITM in bta/bta_api.h

ESP_SPP_SEC_IN_16_DIGITS: Min 16 digit for pin code relate to BTA_SEC_IN_16_DIGITS in bta/bta_api.h

ESP_SPP_MAX_MTU: SPP max MTU

ESP_SPP_MAX_SCN: SPP max SCN

Type Definitions

typedef uint16_t esp_spp_sec_t

typedef void (*esp_spp_cb_t)(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)

SPP callback function type. When handle ESP_SPP_DATA_IND_EVT, it is strongly recommended to cache incoming data, and process them in other lower priority application task rather than in this callback directly.

Param event: Event type
Param param: Point to callback parameter, currently is union type

Enumerations

enum esp_spp_status_t

Values:

enumerator ESP_SPP_SUCCESS: Successful operation.

enumerator ESP_SPP_FAILURE: Generic failure.

enumerator ESP_SPP_BUSY: Temporarily can not handle this request.

enumerator ESP_SPP_NO_DATA: No data

enumerator ESP_SPP_NO_RESOURCE: No more resource

enumerator ESP_SPP_NEED_INIT: SPP module shall init first

enumerator ESP_SPP_NEED_DEINIT: SPP module shall deinit first

enumerator ESP_SPP_NO_CONNECTION: Connection may have been closed

enumerator ESP_SPP_NO_SERVER: No SPP server

enum esp_spp_role_t

Values:

enumerator ESP_SPP_ROLE_MASTER: Role: master

enumerator ESP_SPP_ROLE_SLAVE: Role: slave

enum esp_spp_mode_t

Values:

enumerator ESP_SPP_MODE_CB: When data is coming, a callback will come with data

enumerator ESP_SPP_MODE_VFS: Use VFS to write/read data

enum esp_spp_cb_event_t

SPP callback function events.

Values:

enumerator ESP_SPP_INIT_EVT: When SPP is inited, the event comes

enumerator ESP_SPP_UNINIT_EVT: When SPP is uninited, the event comes

enumerator ESP_SPP_DISCOVERY_COMP_EVT: When SDP discovery complete, the event comes

enumerator ESP_SPP_OPEN_EVT: When SPP Client connection open, the event comes

enumerator ESP_SPP_CLOSE_EVT: When SPP connection closed, the event comes

enumerator ESP_SPP_START_EVT: When SPP server started, the event comes

enumerator ESP_SPP_CL_INIT_EVT: When SPP client initiated a connection, the event comes

enumerator ESP_SPP_DATA_IND_EVT: When SPP connection received data, the event comes, only for ESP_SPP_MODE_CB

enumerator ESP_SPP_CONG_EVT: When SPP connection congestion status changed, the event comes, only for ESP_SPP_MODE_CB

enumerator ESP_SPP_WRITE_EVT: When SPP write operation completes, the event comes, only for ESP_SPP_MODE_CB

enumerator ESP_SPP_SRV_OPEN_EVT: When SPP Server connection open, the event comes

enumerator ESP_SPP_SRV_STOP_EVT: When SPP server stopped, the event comes

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