带 Bluez 卡盘的 BlueCove "Can not open SDP session. [2] No such file or directory"

BlueCove with Bluez chucks "Can not open SDP session. [2] No such file or directory"

我正在尝试编写一个简单的蓝牙服务器,它接受来自我的心率设备(蓝牙 LE)的连接,但它总是引发异常

javax.bluetooth.ServiceRegistrationException: Can not open SDP session. [2] No such file or directory
at com.intel.bluetooth.BluetoothStackBlueZ.openSDPSessionImpl(Native Method) ~[bluecove-gpl-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.BluetoothStackBlueZ.getSDPSession(BluetoothStackBlueZ.java:518) ~[bluecove-gpl-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.BluetoothStackBlueZ.registerSDPRecord(BluetoothStackBlueZ.java:543) ~[bluecove-gpl-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.BluetoothStackBlueZ.rfServerOpen(BluetoothStackBlueZ.java:607) ~[bluecove-gpl-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.BluetoothRFCommConnectionNotifier.<init>(BluetoothRFCommConnectionNotifier.java:42) ~[bluecove-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.MicroeditionConnector.openImpl(MicroeditionConnector.java:389) ~[bluecove-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.intel.bluetooth.MicroeditionConnector.open(MicroeditionConnector.java:156) ~[bluecove-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at javax.microedition.io.Connector.open(Connector.java:83) ~[bluecove-2.1.1-SNAPSHOT-63.jar:2.1.1-SNAPSHOT]
at com.mmazurcz.bluetoothserver.WaitThread.waitForConnection(WaitThread.java:39) [classes/:na]
at com.mmazurcz.bluetoothserver.WaitThread.run(WaitThread.java:60) [classes/:na]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]

我 运行 我的代码在 Arch Linux 机器上,内核为“4.0.5-1-ARCH #1 SMP PREEMPT”。

Java 是 1.8 版的 OpenJDK。0_45 和 Bluecove 是 2.1.1-SNAPSHOT-63 版。我已经安装了以下 BlueZ 工件:

  1. bluez 5.30-1
  2. bluez 固件 1.2-8
  3. bluez-libs 5.30-1
  4. bluez-utils 5.30-1

我正在使用的蓝牙适配器已启动 运行,我可以使用 hcitool -i hci0 lescan 扫描我的心率设备。我也是运行我的代码作为root用户。

所以,这是给我带来麻烦的一段代码:

StreamConnectionNotifier notifier;
StreamConnection connection = null;

// setup the server to listen for connection
try {
    local = LocalDevice.getLocalDevice();
    log.info("Set up local device with BT address: " + local.getBluetoothAddress());
    local.setDiscoverable(DiscoveryAgent.GIAC);
    log.info("Set local device to GIAC discovery mode");

    UUID uuid = new UUID("1101", true);
    String url = "btspp://localhost:" + uuid.toString() + ";name=RemoteBluetooth";
    notifier = (StreamConnectionNotifier) Connector.open(url);
} catch (Exception e) {
    log.error("Exception in WaitThread.waitForConnection", e);
    return;
}

有什么想法吗?

首先:我知道这是一个相当老的 post,但我经常通过 Google 来到这里,我终于让它在我的机器上工作了。

为了让它工作,我们需要使用 -C(或 --compat)选项启动蓝牙守护进程。这是通过进行以下更改来完成的:

打开终端并输入

sudo nano /etc/systemd/system/bluetooth.target.wants/bluetooth.service

然后换行

ExecStart=/usr/lib/bluetooth/bluetoothd

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

(只需添加 -C 选项)

现在您需要重新启动系统守护进程:

sudo systemctl daemon-reload

最后重启蓝牙服务:

sudo systemctl restart bluetooth

我在这里找到了这个解决方案:RaspberryPi Forum: Bluetooth RFCOMM - Jessie

希望我还能帮到别人!

几天来我遇到了同样的问题,我按照 Cyphargs 的说明进行操作,但后来我遇到了新问题,它说权限被拒绝而不是说没有这样的文件或目录,然后我在 Arch Linux forum :

chmod 777 /var/run/sdp  # this line has done the magic