text: // Copyright 2019 Espressif Systems (Shanghai) PTE LTD
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #include <stdint.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdlib.h>
  #include <assert.h>
  #include "bt_common.h"
  #include "btc/btc_common.h"
  #include "btc/btc_dm.h"
  #include "btc_hf_ag.h"
  #include "btc/btc_profile_queue.h"
  #include "btc/btc_manage.h"
  #include "btc/btc_util.h"
  #include "bta/bta_ag_api.h"
  #include "bta/bta_api.h"
  #include "common/bt_target.h"
  #include "common/bt_defs.h"
  #include "device/bdaddr.h"
  #include "esp_bt.h"
  #include "esp_hf_ag_api.h"
  #include "esp_err.h"
  #include "esp_bt_main.h"
  #include "osi/allocator.h"
  
  #if (BTC_HF_INCLUDED == TRUE)
  esp_err_t esp_bt_hf_register_callback(esp_hf_cb_t callback)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      if (callback == NULL) {
          return ESP_FAIL;
      }
      btc_profile_cb_set(BTC_PID_HF, callback);
      return ESP_OK;
  }
  
  esp_err_t esp_bt_hf_init(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_INIT_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.init), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_deinit(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_DEINIT_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.deinit), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_connect(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CONNECT_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.connect), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_disconnect(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_DISCONNECT_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.disconnect), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_connect_audio(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CONNECT_AUDIO_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.connect_audio), remote_addr, sizeof(esp_bd_addr_t));
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_disconnect_audio(esp_bd_addr_t remote_addr)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_DISCONNECT_AUDIO_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.disconnect_audio), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_vra(esp_bd_addr_t remote_addr, esp_hf_vr_state_t value)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_VRA_EVT;
         
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      arg.vra_rep.value = value;
      memcpy(&(arg.volcon.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_volume_control(esp_bd_addr_t remote_addr, esp_hf_volume_control_target_t type, int volume)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_VOLUME_CONTROL_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      arg.volcon.target_type = type;
      arg.volcon.volume = volume;
      memcpy(&(arg.volcon.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_hf_unat_response(esp_bd_addr_t remote_addr, char *unat)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_UNAT_RESPONSE_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      arg.unat_rep.unat = unat;
      memcpy(&(arg.unat_rep.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_cmee_response(esp_bd_addr_t remote_addr, esp_hf_at_response_code_t response_code, esp_hf_cme_err_t error_code)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CME_ERR_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      arg.ext_at.response_code = response_code;
      arg.ext_at.error_code = error_code;
      memcpy(&(arg.ext_at.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_indchange_notification(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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_IND_NOTIFICATION_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.ind_change.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.ind_change.call_state = call_state;
      arg.ind_change.call_setup_state = call_setup_state;
      arg.ind_change.ntk_state = ntk_state;
      arg.ind_change.signal = signal;
  
      /* Switch to BTC context */
      bt_status_t state = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (state == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CIND_RESPONSE_EVT;
      
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.cind_rep.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.cind_rep.call_state = call_state;
      arg.cind_rep.call_setup_state = call_setup_state;
      arg.cind_rep.ntk_state = ntk_state;
      arg.cind_rep.signal = signal;
      arg.cind_rep.roam = roam;
      arg.cind_rep.batt_lev = batt_lev;
      arg.cind_rep.call_held_state = call_held_status;
  
      /* Switch to BTC context */
      bt_status_t stat = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (stat == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_cops_response(esp_bd_addr_t remote_addr, char *name)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_COPS_RESPONSE_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.cops_rep.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.cops_rep.name = name; //deep_copy
  
      /* Switch to BTC context */
      bt_status_t stat = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (stat == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CLCC_RESPONSE_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.clcc_rep.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      //mandatory args
      arg.clcc_rep.index = index;
      arg.clcc_rep.dir = dir;
      arg.clcc_rep.current_call_state = current_call_state;
      arg.clcc_rep.mode = mode;
      arg.clcc_rep.mpty = mpty;
      // option args
      arg.clcc_rep.number = number; //deep_copy
      arg.clcc_rep.type = type;
  
      /* Switch to BTC context */
      bt_status_t stat = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (stat == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_cnum_response(esp_bd_addr_t remote_addr, char *number, esp_hf_subscriber_service_type_t type)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_CNUM_RESPONSE_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.cnum_rep), remote_addr, sizeof(esp_bd_addr_t));
      arg.cnum_rep.number = number; //deep_copy
      arg.cnum_rep.type = type;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_bsir(esp_bd_addr_t remote_addr, esp_hf_in_band_ring_state_t state)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_INBAND_RING_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.bsir.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.bsir.state = state;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_AC_INCALL_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.phone.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.phone.num_active = num_active;
      arg.phone.num_held = num_held;
      arg.phone.call_state = call_state;
      arg.phone.call_setup_state = call_setup_state;
      arg.phone.number = number; //deep_copy
      arg.phone.call_addr_type = call_addr_type;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_RJ_INCALL_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.phone.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.phone.num_active = num_active;
      arg.phone.num_held = num_held;
      arg.phone.call_state = call_state;
      arg.phone.call_setup_state = call_setup_state;
      arg.phone.number = number; //deep_copy
      arg.phone.call_addr_type = call_addr_type;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_END_CALL_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.phone.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.phone.num_active = num_active;
      arg.phone.num_held = num_held;
      arg.phone.call_state = call_state;
      arg.phone.call_setup_state = call_setup_state;
      arg.phone.number = number; //deep_copy
      arg.phone.call_addr_type = call_addr_type;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_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)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_OUT_CALL_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      memcpy(&(arg.phone.remote_addr), remote_addr, sizeof(esp_bd_addr_t));
      arg.phone.num_active = num_active;
      arg.phone.num_held = num_held;
      arg.phone.call_state = call_state;
      arg.phone.call_setup_state = call_setup_state;
      arg.phone.number = number; //deep_copy
      arg.phone.call_addr_type = call_addr_type;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), btc_hf_arg_deep_copy);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  esp_err_t esp_bt_hf_register_data_callback(esp_hf_incoming_data_cb_t recv, esp_hf_outgoing_data_cb_t send)
  {
      if (esp_bluedroid_get_status() != ESP_BLUEDROID_STATUS_ENABLED) {
          return ESP_ERR_INVALID_STATE;
      }
      btc_msg_t msg;
      msg.sig = BTC_SIG_API_CALL;
      msg.pid = BTC_PID_HF;
      msg.act = BTC_HF_REGISTER_DATA_CALLBACK_EVT;
  
      btc_hf_args_t arg;
      memset(&arg, 0, sizeof(btc_hf_args_t));
      arg.reg_data_cb.recv = recv;
      arg.reg_data_cb.send = send;
  
      /* Switch to BTC context */
      bt_status_t status = btc_transfer_context(&msg, &arg, sizeof(btc_hf_args_t), NULL);
      return (status == BT_STATUS_SUCCESS) ? ESP_OK : ESP_FAIL;
  }
  
  #if (BTM_SCO_HCI_INCLUDED == TRUE)
  void esp_hf_outgoing_data_ready(void)
  {
      btc_hf_ci_sco_data();
  }
  #endif /* #if (BTM_SCO_HCI_INCLUDED == TRUE ) */
  
  #endif // BTC_HF_INCLUDED