component/bt: Fix exception when there is no device name

components/bt/bluedroid/api/include/esp_bt_device.h

@@ -35,7 +35,9 @@ const uint8_t *esp_bt_dev_get_address(void);
 
 /**
  * @brief           Set bluetooth device name. This function should be called after esp_bluedroid_enable()
- *                  completes successfully
+ *                  completes successfully.
+ *                  A BR/EDR/LE device type shall have a single Bluetooth device name which shall be
+ *                  identical irrespective of the physical channel used to perform the name discovery procedure.
  *
  * @param[in]       name : device name to be set
  *

components/bt/bluedroid/btc/core/btc_dm.c

@@ -434,6 +434,12 @@ void btc_dm_sec_cb_handler(btc_msg_t *msg)
         //load the bonding device to the btm layer
         btc_storage_load_bonded_ble_devices();
 #endif  ///SMP_INCLUDED == TRUE
+
+        /* Set initial device name, it can be overwritten later */
+        if (p_data->enable.status == BTA_SUCCESS) {
+            char *initial_device_name = "ESP32";
+            BTA_DmSetDeviceName(initial_device_name);
+        }
         btc_enable_bluetooth_evt(p_data->enable.status);
         break;
     }