使用Python Bleak连接Entertech Flowtime设备时扫描到却无法连接求助

问题背景 #

Windows 10 + Python 3.8环境下，使用Bleak库连接Entertech Flowtime头环时，扫描阶段能正常获取设备MAC地址，但执行连接操作时触发bleak.exc.BleakDeviceNotFoundError，提示目标设备未找到。使用的是Entertech官方PC SDK的示例代码。

报错信息 #

INFO - 2023-02-28 14:45:34,569 - enterble.collector.collector - Scanning for Flowtime Headband...
INFO - 2023-02-28 14:45:39,595 - enterble.ble.device - Device initialized: "MY MAC ADDRESS": Flowtime Headband
INFO - 2023-02-28 14:45:39,595 - enterble.collector.collector - Found "MY MAC ADDRESS": Flowtime Headband
INFO - 2023-02-28 14:45:39,596 - enterble.ble.device - Connecting to "MY MAC ADDRESS": Flowtime Headband
Traceback (most recent call last):
  File "c:/Users/enjoy/Documents/EDU-AI/project/AiDO-LOCA/04_version2/brain wave/flowtime.py", line 145, in <module>
    loop.run_until_complete(data_collector())
  File "C:\Users\enjoy\.conda\envs\brain\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
  File "c:/Users/enjoy/Documents/EDU-AI/project/AiDO-LOCA/04_version2/brain wave/flowtime.py", line 133, in data_collector
    await collector.start()
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\enterble\collector\collector.py", line 75, in start
    await self.device.start_notify(char_specifier, callback)
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\enterble\ble\device.py", line 270, in start_notify
    await (await self.client()).start_notify(char_specifier, callback)
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\enterble\ble\device.py", line 129, in client
    await self.connect()
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\enterble\ble\device.py", line 113, in connect
    await self._client.connect()
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\bleak\__init__.py", line 471, in connect
    return await self._backend.connect(**kwargs)
  File "C:\Users\enjoy\.conda\envs\brain\lib\site-packages\bleak\backends\winrt\client.py", line 239, in connect
    raise BleakDeviceNotFoundError(
bleak.exc.BleakDeviceNotFoundError: Device with address "MY MAC ADDRESS" was not found.

解决方案 #

• 改用设备UUID连接
  Windows平台下Bleak的WinRT后端对MAC地址的寻址支持存在兼容性问题，优先使用扫描时获取的设备UUID替代MAC地址。修改示例代码中指定目标设备的逻辑，将MAC替换为对应UUID。

• 检查设备配对与蓝牙状态

  • 确保Flowtime头环未与其他设备（如手机）保持连接，BLE设备通常仅支持单连接
  • 手动在Windows蓝牙设置中完成设备配对后，再执行代码连接操作

• 延长连接超时时间
  在连接逻辑中添加timeout参数，避免因设备响应延迟导致连接失败。可修改Entertech SDK中device.py的连接代码：

  await self._client.connect(timeout=10.0)
  

• 更新依赖库版本
  升级Bleak至最新稳定版（建议>=0.19.0），旧版本WinRT后端存在设备寻址bug；同时确保Entertech PC SDK为最新版本，修复已知兼容性问题。

• 关闭蓝牙适配器节能模式
  进入Windows设备管理器，找到蓝牙适配器，在“电源管理”选项卡中取消勾选“允许计算机关闭此设备以节约电源”，避免扫描后蓝牙适配器休眠导致设备无法被寻址。

内容的提问来源于stack exchange，提问作者yeon