Bluetooth: Classic: add dynamic local name support

Implement dynamic local name update for BR/EDR connections. When
CONFIG_BT_DEVICE_NAME_DYNAMIC is enabled, the device name is now
properly synchronized between LE and BR/EDR transports. Includes:

- Initialize BR/EDR local name with configured device name during init
- Update BR/EDR local name when bt_set_name() is called
- Maintain consistency between LE and BR/EDR naming

Signed-off-by: Kai Cheng <[email protected]>

Author: chengkai15

subsys/bluetooth/host/classic/br.c

@@ -863,6 +863,10 @@ int bt_br_init(void)
 		return err;
 	}
 
+#if defined(CONFIG_BT_DEVICE_NAME_DYNAMIC)
+	strncpy(bt_dev.name, CONFIG_BT_DEVICE_NAME, CONFIG_BT_DEVICE_NAME_MAX);
+#endif
+
 	/* Set Class of device */
 	buf = bt_hci_cmd_alloc(K_FOREVER);
 	if (!buf) {

subsys/bluetooth/host/hci_core.c

@@ -4766,6 +4766,14 @@ int bt_set_name(const char *name)
 		}
 	}
 
+	if (IS_ENABLED(CONFIG_BT_CLASSIC)) {
+		err = bt_br_write_local_name(bt_dev.name);
+		if (err) {
+			LOG_WRN("Unable to set local name");
+			return err;
+		}
+	}
+
 	return 0;
 #else
 	return -ENOMEM;