text: // Copyright 2015-2016 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 "esp32-hal-bt.h"
  
  #ifdef CONFIG_BT_ENABLED
  
  bool btInUse(){ return true; }
  
  #include "esp_bt.h"
  
  #ifdef CONFIG_BTDM_CONTROLLER_MODE_BTDM
  #define BT_MODE ESP_BT_MODE_BTDM
  #elif defined(CONFIG_BTDM_CONTROLLER_MODE_BR_EDR_ONLY)
  #define BT_MODE ESP_BT_MODE_CLASSIC_BT
  #else
  #define BT_MODE ESP_BT_MODE_BLE
  #endif
  
  bool btStarted(){
      return (esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED);
  }
  
  bool btStart(){
      esp_bt_controller_config_t cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
          return true;
      }
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){
          esp_bt_controller_init(&cfg);
          while(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){}
      }
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_INITED){
          if (esp_bt_controller_enable(BT_MODE)) {
              log_e("BT Enable failed");
              return false;
          }
      }
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
          return true;
      }
      log_e("BT Start failed");
      return false;
  }
  
  bool btStop(){
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE){
          return true;
      }
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED){
          if (esp_bt_controller_disable()) {
              log_e("BT Disable failed");
              return false;
          }
          while(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_ENABLED);
      }
      if(esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_INITED){
          if (esp_bt_controller_deinit()) {
  			log_e("BT deint failed");
  			return false;
  		}
  		vTaskDelay(1);
  		if (esp_bt_controller_get_status() != ESP_BT_CONTROLLER_STATUS_IDLE) {			
  			return false;		
  		}
          return true;
      }
      log_e("BT Stop failed");
      return false;
  }
  
  #else // CONFIG_BT_ENABLED
  bool btStarted()
  {
      return false;
  }
  
  bool btStart()
  {
      return false;
  }
  
  bool btStop()
  {
      return false;
  }
  
  #endif // CONFIG_BT_ENABLED
  
  