typedef struct {
  vm_bt_gatt_register_client_callback register_client;
  vm_bt_gatt_scan_result_callback scan_result;
  vm_bt_gatt_connection_callback connection;
  vm_bt_gatt_listen_callback listen;
  vm_bt_gatt_set_advertisement_data_callback set_advertisement_data;
  vm_bt_gatt_search_complete_callback search_complete;
  vm_bt_gatt_search_result_callback search_result;
  vm_bt_gatt_get_characteristic_callback get_characteristic;
  vm_bt_gatt_get_descriptor_callback get_descriptor;
  vm_bt_gatt_get_included_service_callback get_included_service;
  vm_bt_gatt_register_for_notification_callback register_for_notification;
  vm_bt_gatt_notify_callback notify;
  vm_bt_gatt_read_characteristic_callback read_characteristic;
  vm_bt_gatt_write_characteristic_callback write_characteristic;
  vm_bt_gatt_read_descriptor_callback read_descriptor;
  vm_bt_gatt_write_descriptor_callback write_descriptor;
  vm_bt_gatt_execute_write_callback execute_write;
  vm_bt_gatt_read_remote_rssi_callback read_remote_rssi;
  vm_bt_gatt_get_device_type_callback get_device_type;
} vm_bt_gatt_client_callback_t;