bluetooth.btcommon.BluetoothError: [Errno 2] 没有这样的文件或目录答案

【问题标题】：bluetooth.btcommon.BluetoothError: [Errno 2] No such file or directorybluetooth.btcommon.BluetoothError: [Errno 2] 没有这样的文件或目录
【发布时间】：2022-08-23 20:45:48
【问题描述】：

我正在尝试通过 Python 脚本使用 Khadas 板上的 pybluez 连接到蓝牙设备（有点像 Raspberry Pi，aarch64）。

我已手动将 PyBluez 更新为 5.65，因为它包含我需要的修复程序。 bluetoothctl --version 和 bluetoothd --version 都返回 5.65。

启动我的脚本后，我得到

> python main.py
...
  File \"/home/khadas/env/lib/python3.8/site-packages/bluetooth/bluez.py\", line 271, in advertise_service
    _bt.sdp_advertise_service (sock._sock, name, service_id, \\
_bluetooth.error: (2, \'No such file or directory\')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File \"/home/khadas/copilot/copilot/process/process.py\", line 126, in run
    self._pre_run()
  File \"/home/khadas/copilot/copilot/task/bluetooth_connector_task.py\", line 55, in _pre_run
    bluetooth.advertise_service(
  File \"/home/khadas/env/lib/python3.8/site-packages/bluetooth/bluez.py\", line 275, in advertise_service
    raise BluetoothError (*e.args)
bluetooth.btcommon.BluetoothError: [Errno 2] No such file or directory

在this 之后，我编辑了/etc/systemd/system/dbus-org.bluez.service 和/lib/systemd/system/bluetooth.service 拥有

ExecStart=/usr/libexec/bluetooth/bluetoothd -C

然后我重新启动了守护进程

sudo systemctl daemon-reload & sudo systemctl restart bluetooth & sudo sdptool add SP

但我的错误仍然存在。

你们有没有人遇到过这种情况？

感谢您的时间：）

注意：这个线程表明，在sudo sdptool add SP 之后，应该已经在/var/run/sdp 创建了一个文件；它不是。

注意：蓝牙服务正在运行，但有错误，即

(env) khadas@khadas > systemctl status bluetooth.service            
● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2022-08-11 13:23:09 UTC; 13min ago
       Docs: man:bluetoothd(8)
   Main PID: 14256 (bluetoothd)
     Status: \"Running\"
      Tasks: 1 (limit: 2932)
     Memory: 676.0K
     CGroup: /system.slice/bluetooth.service
             └─14256 /usr/libexec/bluetooth/bluetoothd -C

Aug 11 13:23:09 khadas systemd[1]: Starting Bluetooth service...
Aug 11 13:23:09 khadas bluetoothd[14256]: Bluetooth daemon 5.65
Aug 11 13:23:09 khadas systemd[1]: Started Bluetooth service.
Aug 11 13:23:09 khadas bluetoothd[14256]: Starting SDP server
Aug 11 13:23:09 khadas bluetoothd[14256]: src/sdpd-server.c:init_server() binding UNIX socket: Read-only file system
Aug 11 13:23:09 khadas bluetoothd[14256]: src/sdpd-server.c:start_sdp_server() Server initialization failed
Aug 11 13:23:09 khadas bluetoothd[14256]: Bluetooth management interface 1.14 initialized
Aug 11 13:23:09 khadas bluetoothd[14256]: src/adapter.c:reset_adv_monitors_complete() Failed to reset Adv Monitors: Unknown Command (0x01)

标签： python bluetooth pybluez

【解决方案1】：

如果您升级，您还必须更新系统服务配置，因为新配置在这种情况下不起作用。如果您运行sudo service bluetooth status，您将看到新配置无法正确启动 SDP 服务器：

● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2022-08-23 11:42:36 UTC; 10min ago
       Docs: man:bluetoothd(8)
   Main PID: 3773 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 2934)
     Memory: 2.1M
     CGroup: /system.slice/bluetooth.service
             └─3773 /usr/libexec/bluetooth/bluetoothd -C

Aug 23 11:42:36 biped12 systemd[1]: Starting Bluetooth service...
Aug 23 11:42:36 biped12 systemd[3773]: ConfigurationDirectory 'bluetooth' already exists but the mode is different. (File system: 755 ConfigurationDirectoryMode: 555)
Aug 23 11:42:36 biped12 bluetoothd[3773]: Bluetooth daemon 5.65
Aug 23 11:42:36 biped12 systemd[1]: Started Bluetooth service.
Aug 23 11:42:36 biped12 bluetoothd[3773]: Starting SDP server
Aug 23 11:42:36 biped12 bluetoothd[3773]: src/sdpd-server.c:init_server() binding UNIX socket: Read-only file system
Aug 23 11:42:36 biped12 bluetoothd[3773]: src/sdpd-server.c:start_sdp_server() Server initialization failed
Aug 23 11:42:36 biped12 bluetoothd[3773]: Bluetooth management interface 1.14 initialized
Aug 23 11:42:36 biped12 bluetoothd[3773]: src/adapter.c:reset_adv_monitors_complete() Failed to reset Adv Monitors: Unknown Command (0x01)

要解决此问题，您必须将配置更改为：

[Unit]
Description=Bluetooth service
Documentation=man:bluetoothd(8)
ConditionPathIsDirectory=/sys/class/bluetooth

[Service]
Type=dbus
BusName=org.bluez
ExecStart=/usr/lib/bluetooth/bluetoothd -C
NotifyAccess=main
#WatchdogSec=10
Restart=on-failure
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
LimitNPROC=1
ProtectHome=true
ProtectSystem=full

[Install]
WantedBy=bluetooth.target
Alias=dbus-org.bluez.service

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