QBluetooth BLE广告不适用于ubuntu (BlueZ)

Question

我今天试着用Qt为一项BluetoothLE服务做广告。我从测试蓝牙低能心率服务器实例开始，它在我的安卓手机上运行得很好。不过，在我的Ubuntu18.04笔记本电脑上，我无法让它工作。

当我以根用户的身份运行这个示例时，我会得到错误qt.bluetooth.bluez: received advertising error。启用调试消息之后，我得到了以下日志：

qt.bluetooth: Using BlueZ kernel ATT interface
qt.bluetooth.bluez: Bluez 5 detected.
qt.bluetooth.bluez: Starting to advertise
qt.bluetooth.bluez: sending command; ogf: 8 ocf: 7
qt.bluetooth.bluez: command sent successfully
qt.bluetooth.bluez: HCI event triggered, type: e
qt.bluetooth.bluez: command 7 failed with status 12
qt.bluetooth.bluez: reading power level failed, leaving it out of the advertising data
qt.bluetooth.bluez: advertising parameters: "000800080000000000000000000700"
qt.bluetooth.bluez: advertising data: "18020106100948656172745261746553657276657203030d1800000000000000"
qt.bluetooth.bluez: scan response data: "15100948656172745261746553657276657203030d1800000000000000000000"
qt.bluetooth.bluez: sending command; ogf: 8 ocf: 10
qt.bluetooth.bluez: command sent successfully
qt.bluetooth.bluez: HCI event triggered, type: e
qt.bluetooth.bluez: command 10 failed with status 12
qt.bluetooth.bluez: Advertising disable failed, ignoring
qt.bluetooth.bluez: sending command; ogf: 8 ocf: 6
qt.bluetooth.bluez: command sent successfully
qt.bluetooth.bluez: HCI event triggered, type: e
qt.bluetooth.bluez: command 6 failed with status 12
qt.bluetooth.bluez: received advertising error

有人知道这些错误信息是什么意思吗？

谢谢你帮忙！

Answer 1

当我试图在Intel设备上使用https://github.com/nymea/nymea-networkmanager时，也遇到了类似的问题。每当它试图发出蓝牙LE命令时，我都会通过btmon看到‘命令不允许’。

发布hcitool cmd 0x03 0x000会重置设备，让它开始做广告，但很快它就会再次崩溃。看来，在4.19内核中引入了大量的蓝牙更改，并导致了LE系统调用的问题。

我能够通过使用带有4.15内核的较旧的Ubuntu版本来使它工作。

这里有更多的细节，https://github.com/nymea/nymea-networkmanager/issues/46