HFP AG API

API Reference

Header File

Functions

esp_err_t esp_hf_ag_register_callback(esp_hf_cb_t callback)

Register application callback function to HFP AG module. This function should be called only after esp_bluedroid_enable() completes successfully.

Parameters

callback – [in] HFP AG event callback function

Returns

  • ESP_OK: success

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: if callback is a NULL function pointer

esp_err_t esp_hf_ag_init(void)

Initialize the bluetooth HF AG module. This function should be called after esp_bluedroid_enable() completes successfully.

Returns

  • ESP_OK: if the initialization request is sent successfully

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_deinit(void)

De-initialize for HF AG module. This function should be called only after esp_bluedroid_enable() completes successfully.

Returns

  • ESP_OK: success

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_slc_connect(esp_bd_addr_t remote_bda)

To establish a Service Level Connection to remote bluetooth HFP client device. This function must be called after esp_hf_ag_init() and before esp_hf_ag_deinit().

Parameters

remote_bda – [in] remote bluetooth HFP client device address

Returns

  • ESP_OK: connect request is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_slc_disconnect(esp_bd_addr_t remote_bda)

Disconnect from the remote HFP client. This function must be called after esp_hf_ag_init() and before esp_hf_ag_deinit().

Parameters

remote_bda – [in] remote bluetooth device address

Returns

  • ESP_OK: disconnect request is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_audio_connect(esp_bd_addr_t remote_bda)

Create audio connection with remote HFP client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

remote_bda – [in] remote bluetooth device address

Returns

  • ESP_OK: audio connect request is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_audio_disconnect(esp_bd_addr_t remote_bda)

Release the established audio connection with remote HFP client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

remote_bda – [in] remote bluetooth device address

Returns

  • ESP_OK: audio disconnect request is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_vra_control(esp_bd_addr_t remote_bda, esp_hf_vr_state_t value)

Response of Volume Recognition Command(AT+VRA) from HFP client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_bda – [in] the device address of voice recognition initiator

  • value – [in] 0 - voice recognition disabled, 1- voice recognition enabled

Returns

  • ESP_OK: response of volume recognition is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_volume_control(esp_bd_addr_t remote_bda, esp_hf_volume_control_target_t type, int volume)

Volume synchronization with HFP client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_bda – [in] remote bluetooth device address

  • type – [in] volume control target, speaker or microphone

  • volume – [in] gain of the speaker of microphone, ranges 0 to 15

Returns

  • ESP_OK: volume synchronization control is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_ERR_INVALID_ARG: if arguments are invalid

  • ESP_FAIL: others

esp_err_t esp_hf_ag_unknown_at_send(esp_bd_addr_t remote_addr, char *unat)

Handle Unknown AT command from HFP Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • unat – [in] User AT command response to HF Client. It will response “ERROR” by default if unat is NULL.

Returns

  • ESP_OK: response of unknown AT command is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_cmee_send(esp_bd_addr_t remote_bda, esp_hf_at_response_code_t response_code, esp_hf_cme_err_t error_code)

Unsolicited send extend AT error code to HFP Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_bda – [in] remote bluetooth device address

  • response_code – [in] AT command response code

  • error_code – [in] CME error code

Returns

  • ESP_OK: extend error code is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_devices_status_indchange(esp_bd_addr_t remote_addr, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, esp_hf_network_state_t ntk_state, int signal)

Unsolicited send device status notification to HFP Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • ntk_state – [in] network service state

  • signal – [in] signal strength from 0 to 5

Returns

  • ESP_OK: device status notification is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_ERR_INVALID_ARG: if arguments are invalid

  • ESP_FAIL: others

esp_err_t esp_hf_ag_ciev_report(esp_bd_addr_t remote_addr, esp_hf_ciev_report_type_t ind_type, int value)

Send indicator report “+CIEV: <ind> <value>” to HFP Client. “CIEV” means “indicator events reporting”, and all indicator types can be sent one type at a time. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • ind_type – [in] indicator type

  • value – [in] indicator value

Returns

  • ESP_OK: indicator report is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_cind_response(esp_bd_addr_t remote_addr, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, esp_hf_network_state_t ntk_state, int signal, esp_hf_roaming_status_t roam, int batt_lev, esp_hf_call_held_status_t call_held_status)

Response to device individual indicators to HFP Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • ntk_state – [in] network service state

  • signal – [in] signal strength from 0 to 5

  • roam – [in] roam state

  • batt_lev – [in] battery level from 0 to 5

  • call_held_status – [in] call held status

Returns

  • ESP_OK: response to device individual indicators is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_ERR_INVALID_ARG: if the arguments are invalid

  • ESP_FAIL: others

esp_err_t esp_hf_ag_cops_response(esp_bd_addr_t remote_addr, char *name)

Reponse for AT+COPS command from HF Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • name – [in] current operator name

Returns

  • ESP_OK: reponse for AT+COPS command is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_clcc_response(esp_bd_addr_t remote_addr, int index, esp_hf_current_call_direction_t dir, esp_hf_current_call_status_t current_call_state, esp_hf_current_call_mode_t mode, esp_hf_current_call_mpty_type_t mpty, char *number, esp_hf_call_addr_type_t type)

Response to AT+CLCC command from HFP Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • index – [in] the index of current call, starting with 1, finishing response with 0 (send OK)

  • dir – [in] call direction (incoming/outgoing)

  • current_call_state – [in] current call state

  • mode – [in] current call mode (voice/data/fax)

  • mpty – [in] single or multi type

  • number – [in] current call number

  • type – [in] international type or unknow

Returns

  • ESP_OK: response to AT+CLCC command is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_cnum_response(esp_bd_addr_t remote_addr, char *number, int number_type, esp_hf_subscriber_service_type_t service_type)

Response for AT+CNUM command from HF Client. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • number – [in] registration number

  • number_type – [in] value of number type from 128-143: national or international, may contain prefix and/or escape digits 144-159: international, includes country code prefix, add “+” if needed 160-175: national, but no prefix nor escape digits

  • service_type – [in] service type (unknown/voice/fax)

Returns

  • ESP_OK: response for AT+CNUM command is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_bsir(esp_bd_addr_t remote_addr, esp_hf_in_band_ring_state_t state)

Inform HF Client that AG Provided in-band ring tone or not. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • state – [in] in-band ring tone state

Returns

  • ESP_OK: information of in-band ring tone is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_ERR_INVALID_ARG: if arguments are invalid

  • ESP_FAIL: others

esp_err_t esp_hf_ag_answer_call(esp_bd_addr_t remote_addr, int num_active, int num_held, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, char *number, esp_hf_call_addr_type_t call_addr_type)

Answer Incoming Call from AG. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • num_active – [in] the number of active call

  • num_held – [in] the number of held call

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • number – [in] number of the incoming call

  • call_addr_type – [in] call address type

Returns

  • ESP_OK: answer incoming call is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_reject_call(esp_bd_addr_t remote_addr, int num_active, int num_held, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, char *number, esp_hf_call_addr_type_t call_addr_type)

Reject Incoming Call from AG. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • num_active – [in] the number of active call

  • num_held – [in] the number of held call

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • number – [in] number of the incoming call

  • call_addr_type – [in] call address type

Returns

  • ESP_OK: reject incoming call is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_out_call(esp_bd_addr_t remote_addr, int num_active, int num_held, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, char *number, esp_hf_call_addr_type_t call_addr_type)

Initiate a call from AG. As a precondition to use this API, Service Level Connection shall exist with HFP client. If the AG is driven by the HF to call esp_hf_ag_out_call, it needs to response an OK or ERROR to HF. But if the AG is actively calling esp_hf_ag_out_call, it does not need to take a response to HF.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • num_active – [in] the number of active call

  • num_held – [in] the number of held call

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • number – [in] number of the outgoing call

  • call_addr_type – [in] call address type

Returns

  • ESP_OK: a call initiation is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_end_call(esp_bd_addr_t remote_addr, int num_active, int num_held, esp_hf_call_status_t call_state, esp_hf_call_setup_status_t call_setup_state, char *number, esp_hf_call_addr_type_t call_addr_type)

End an ongoing call. As a precondition to use this API, Service Level Connection shall exist with HFP client.

Parameters

  • remote_addr – [in] remote bluetooth device address

  • num_active – [in] the number of active call

  • num_held – [in] the number of held call

  • call_state – [in] call state

  • call_setup_state – [in] call setup state

  • number – [in] number of the call

  • call_addr_type – [in] call address type

Returns

  • ESP_OK: end an ongoing call is sent to lower layer

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

esp_err_t esp_hf_ag_register_data_callback(esp_hf_incoming_data_cb_t recv, esp_hf_outgoing_data_cb_t send)

Register AG data output function. The callback is only used in the case that Voice Over HCI is enabled.

Parameters

  • recv – [in] HFP client incoming data callback function

  • send – [in] HFP client outgoing data callback function

Returns

  • ESP_OK: success

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: if callback is a NULL function pointer

esp_err_t esp_hf_ag_pkt_stat_nums_get(uint16_t sync_conn_handle)

Get the number of packets received and sent. 

             This function is only used in the case that Voice Over HCI is enabled and the audio state is connected.
             When the operation is completed, the callback function will be called with ESP_HF_PKT_STAT_NUMS_GET_EVT.

Parameters

sync_conn_handle – [in] the (e)SCO connection handle

Returns

  • ESP_OK: if the request is sent successfully

  • ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled

  • ESP_FAIL: others

void esp_hf_ag_outgoing_data_ready(void)

Trigger the lower-layer to fetch and send audio data. 

             This function is only used in the case that Voice Over HCI is enabled.
             As a precondition to use this API, Service Level Connection shall exist with HFP client.
             After this function is called, lower layer will invoke esp_hf_client_outgoing_data_cb_t to fetch data

Unions

union esp_hf_cb_param_t
#include <esp_hf_ag_api.h>

HFP AG callback parameters.

Public Members

struct esp_hf_cb_param_t::hf_conn_stat_param conn_stat

AG callback param of ESP_HF_CONNECTION_STATE_EVT

struct esp_hf_cb_param_t::hf_audio_stat_param audio_stat

AG callback param of ESP_HF_AUDIO_STATE_EVT

struct esp_hf_cb_param_t::hf_vra_rep_param vra_rep

AG callback param of ESP_HF_BVRA_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_volume_control_param volume_control

AG callback param of ESP_HF_VOLUME_CONTROL_EVT

struct esp_hf_cb_param_t::hf_unat_rep_param unat_rep

AG callback param of ESP_HF_UNAT_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_out_call_param out_call

AG callback param of ESP_HF_DIAL_EVT

struct esp_hf_cb_param_t::hf_ind_upd_param ind_upd

AG callback param of ESP_HF_IND_UPDATE_EVT

struct esp_hf_cb_param_t::hf_cind_rep_param cind_rep

AG callback param of ESP_HF_CIND_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_cops_rep_param cops_rep

AG callback param of ESP_HF_COPS_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_clcc_rep_param clcc_rep

AG callback param of ESP_HF_CLCC_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_cnum_rep_param cnum_rep

AG callback param of ESP_HF_CNUM_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_vts_rep_param vts_rep

AG callback param of ESP_HF_VTS_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_nrec_param nrec

AG callback param of ESP_HF_NREC_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_ata_rep_param ata_rep

AG callback param of ESP_HF_ATA_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_chup_rep_param chup_rep

AG callback param of ESP_HF_CHUP_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_wbs_rep_param wbs_rep

AG callback param of ESP_HF_WBS_RESPONSE_EVT

struct esp_hf_cb_param_t::hf_bcs_rep_param bcs_rep

AG callback param of ESP_HF_BCS_RESPONSE_EVT

struct esp_hf_cb_param_t::ag_pkt_status_nums pkt_nums

AG callback param of ESP_HF_PKT_STAT_NUMS_GET_EVT

struct ag_pkt_status_nums
#include <esp_hf_ag_api.h>

ESP_HF_PKT_STAT_NUMS_GET_EVT.

Public Members

uint32_t rx_total

the total number of packets received

uint32_t rx_correct

the total number of packets data correctly received

uint32_t rx_err

the total number of packets data with possible invalid

uint32_t rx_none

the total number of packets data no received

uint32_t rx_lost

the total number of packets data partially lost

uint32_t tx_total

the total number of packets send

uint32_t tx_discarded

the total number of packets send lost

struct hf_ata_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_ATA_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_audio_stat_param
#include <esp_hf_ag_api.h>

ESP_HF_AUDIO_STATE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_audio_state_t state

Audio connection state

uint16_t sync_conn_handle

(e)SCO connection handle

struct hf_bcs_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_BCS_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_wbs_config_t mode

codec mode CVSD or mSBC

struct hf_chup_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_CHUP_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_cind_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_CIND_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_clcc_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_CLCC_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_cnum_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_CNUM_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_conn_stat_param
#include <esp_hf_ag_api.h>

ESP_HF_CONNECTION_STATE_EVT.

Public Members

esp_bd_addr_t remote_bda

Remote bluetooth device address

esp_hf_connection_state_t state

Connection state

uint32_t peer_feat

HF supported features

uint32_t chld_feat

AG supported features on call hold and multiparty services

struct hf_cops_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_COPS_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_ind_upd_param
#include <esp_hf_ag_api.h>

ESP_HF_IND_UPDATE_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

struct hf_nrec_param
#include <esp_hf_ag_api.h>

ESP_HF_NREC_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_nrec_t state

NREC enabled or disabled

struct hf_out_call_param
#include <esp_hf_ag_api.h>

ESP_HF_DIAL_EVT.

Public Members

esp_bd_addr_t remote_addr

remote bluetooth device address

esp_hf_dial_type_t type

dial type

char *num_or_loc

location in phone memory

struct hf_unat_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_UNAT_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

char *unat

Unknown AT command string

struct hf_volume_control_param
#include <esp_hf_ag_api.h>

ESP_HF_VOLUME_CONTROL_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_volume_type_t type

Volume control target, speaker or microphone

int volume

Gain, ranges from 0 to 15

struct hf_vra_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_BVRA_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_vr_state_t value

Voice recognition state

struct hf_vts_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_VTS_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

char *code

MTF code from HF Client

struct hf_wbs_rep_param
#include <esp_hf_ag_api.h>

ESP_HF_WBS_RESPONSE_EVT.

Public Members

esp_bd_addr_t remote_addr

Remote bluetooth device address

esp_hf_wbs_config_t codec

codec mode CVSD or mSBC

Macros

ESP_HF_PEER_FEAT_3WAY
ESP_HF_PEER_FEAT_ECNR
ESP_HF_PEER_FEAT_VREC
ESP_HF_PEER_FEAT_INBAND
ESP_HF_PEER_FEAT_VTAG
ESP_HF_PEER_FEAT_REJECT
ESP_HF_PEER_FEAT_ECS
ESP_HF_PEER_FEAT_ECC
ESP_HF_PEER_FEAT_EXTERR
ESP_HF_PEER_FEAT_CODEC
ESP_HF_PEER_FEAT_HF_IND
ESP_HF_PEER_FEAT_ESCO_S4
ESP_HF_CHLD_FEAT_REL
ESP_HF_CHLD_FEAT_REL_ACC
ESP_HF_CHLD_FEAT_REL_X
ESP_HF_CHLD_FEAT_HOLD_ACC
ESP_HF_CHLD_FEAT_PRIV_X
ESP_HF_CHLD_FEAT_MERGE
ESP_HF_CHLD_FEAT_MERGE_DETACH

Type Definitions

typedef void (*esp_hf_incoming_data_cb_t)(const uint8_t *buf, uint32_t len)

AG incoming data callback function, the callback is useful in case of Voice Over HCI.

Param buf

[in] : pointer to incoming data(payload of HCI synchronous data packet), the buffer is allocated inside bluetooth protocol stack and will be released after invoke of the callback is finished.

Param len

[in] : size(in bytes) in buf

typedef uint32_t (*esp_hf_outgoing_data_cb_t)(uint8_t *buf, uint32_t len)

AG outgoing data callback function, the callback is useful in case of Voice Over HCI. Once audio connection is set up and the application layer has prepared data to send, the lower layer will call this function to read data and then send. This callback is supposed to be implemented as non-blocking, and if data is not enough, return value 0 is supposed.

Param buf

[in] : pointer to incoming data(payload of HCI synchronous data packet), the buffer is allocated inside bluetooth protocol stack and will be released after invoke of the callback is finished.

Param len

[in] : size(in bytes) in buf

Return

length of data successfully read

typedef void (*esp_hf_cb_t)(esp_hf_cb_event_t event, esp_hf_cb_param_t *param)

HF AG callback function type.

Param event

: Event type

Param param

: Pointer to callback parameter

Enumerations

enum esp_hf_cb_event_t

HF callback events.

Values:

enumerator ESP_HF_CONNECTION_STATE_EVT

Connection state changed event

enumerator ESP_HF_AUDIO_STATE_EVT

Audio connection state change event

enumerator ESP_HF_BVRA_RESPONSE_EVT

Voice recognition state change event

enumerator ESP_HF_VOLUME_CONTROL_EVT

Audio volume control command from HF Client, provided by +VGM or +VGS message

enumerator ESP_HF_UNAT_RESPONSE_EVT

Unknown AT cmd Response

enumerator ESP_HF_IND_UPDATE_EVT

Indicator Update Event

enumerator ESP_HF_CIND_RESPONSE_EVT

Call And Device Indicator Response

enumerator ESP_HF_COPS_RESPONSE_EVT

Current operator information

enumerator ESP_HF_CLCC_RESPONSE_EVT

List of current calls notification

enumerator ESP_HF_CNUM_RESPONSE_EVT

Subscriber information response from HF Client

enumerator ESP_HF_VTS_RESPONSE_EVT

Enable or not DTMF

enumerator ESP_HF_NREC_RESPONSE_EVT

Enable or not NREC

enumerator ESP_HF_ATA_RESPONSE_EVT

Answer an Incoming Call

enumerator ESP_HF_CHUP_RESPONSE_EVT

Reject an Incoming Call

enumerator ESP_HF_DIAL_EVT

Origin an outgoing call with specific number or the dial the last number

enumerator ESP_HF_WBS_RESPONSE_EVT

Codec Status

enumerator ESP_HF_BCS_RESPONSE_EVT

Final Codec Choice

enumerator ESP_HF_PKT_STAT_NUMS_GET_EVT

Request number of packet different status

enum esp_hf_dial_type_t

Dial type of ESP_HF_DIAL_EVT.

Values:

enumerator ESP_HF_DIAL_NUM

Dial with a phone number

enumerator ESP_HF_DIAL_VOIP

Dial with VoIP

enumerator ESP_HF_DIAL_MEM

Dial with a memory position

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