fix(ble): support Python 3.9 type annotations

tools/ble/ble_uart_bridge/src/console/api.py

@@ -3,7 +3,10 @@
 
 from __future__ import annotations
 
+# Keep annotations compatible with Python 3.9.
+# ruff: noqa: UP007
 import asyncio
+from typing import Union
 
 from .console import BLEUARTConsole
 from .console import ConsoleEncoding
@@ -12,8 +15,8 @@ from .console import ConsoleTerminator
 
 def run_console(
     device_id: str,
-    terminator: ConsoleTerminator | str = ConsoleTerminator.lf,
-    encoding: ConsoleEncoding | str = ConsoleEncoding.text,
+    terminator: Union[ConsoleTerminator, str] = ConsoleTerminator.lf,
+    encoding: Union[ConsoleEncoding, str] = ConsoleEncoding.text,
     with_response: bool = False,
 ) -> None:
     # Initialize BLE UART Console

tools/ble/ble_uart_bridge/src/console/console.py

@@ -3,9 +3,12 @@
 
 from __future__ import annotations
 
+# Keep annotations compatible with Python 3.9.
+# ruff: noqa: UP007
 import asyncio
 import codecs
 from enum import Enum
+from typing import Union
 
 from loguru import logger
 from rich.highlighter import Highlighter
@@ -93,8 +96,8 @@ class BLEUARTConsole(App):
     def __init__(
         self,
         device_id: str,
-        terminator: ConsoleTerminator | str = ConsoleTerminator.lf,
-        encoding: ConsoleEncoding | str = ConsoleEncoding.text,
+        terminator: Union[ConsoleTerminator, str] = ConsoleTerminator.lf,
+        encoding: Union[ConsoleEncoding, str] = ConsoleEncoding.text,
         with_response: bool = False,
     ) -> None:
         super().__init__()
@@ -109,7 +112,7 @@ class BLEUARTConsole(App):
         self._ui_ready = False
 
     @staticmethod
-    def _parse_terminator(terminator: ConsoleTerminator | str) -> bytes:
+    def _parse_terminator(terminator: Union[ConsoleTerminator, str]) -> bytes:
         try:
             return TERMINATORS[ConsoleTerminator(terminator)]
         except ValueError:
@@ -117,7 +120,7 @@ class BLEUARTConsole(App):
             raise ValueError(f'Unsupported terminator: {terminator}. Expected one of: {choices}') from None
 
     @staticmethod
-    def _parse_encoding(encoding: ConsoleEncoding | str) -> ConsoleEncoding:
+    def _parse_encoding(encoding: Union[ConsoleEncoding, str]) -> ConsoleEncoding:
         try:
             return ConsoleEncoding(encoding)
         except ValueError:

tools/ble/ble_uart_bridge/src/daemon/api.py

@@ -1,8 +1,12 @@
 # SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 
+# Keep annotations compatible with Python 3.9.
+# ruff: noqa: UP007
+
 import json
 from typing import Any
+from typing import Optional
 from urllib.error import HTTPError
 from urllib.error import URLError
 from urllib.request import Request
@@ -20,7 +24,7 @@ def _daemon_url(host: str, port: int, path: str) -> str:
 def _request_json(
     method: str,
     url: str,
-    payload: dict[str, Any] | None = None,
+    payload: Optional[dict[str, Any]] = None,
     timeout: float = 10.0,
 ) -> dict[str, Any]:
     data = json.dumps(payload).encode() if payload is not None else None

tools/ble/ble_uart_bridge/src/daemon/server.py

@@ -1,10 +1,14 @@
 # SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 
+# Keep annotations compatible with Python 3.9.
+# ruff: noqa: UP007
+
 import asyncio
 import json
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
+from typing import Optional
 from uuid import uuid4
 
 from fastapi import FastAPI
@@ -66,8 +70,8 @@ def _request_data_size(data: object) -> int:
 
 @app.get('/status')
 async def status() -> dict:
-    bridge: BLEUARTBridge | None = getattr(app.state, 'bridge', None)
-    pending_requests: dict | None = getattr(app.state, 'pending_requests', None)
+    bridge: Optional[BLEUARTBridge] = getattr(app.state, 'bridge', None)
+    pending_requests: Optional[dict] = getattr(app.state, 'pending_requests', None)
 
     return {
         'device_id': getattr(app.state, 'device_id', None),