Re: bt dongle goes awry after too many connections

[Andrejs Hanins <andrejs.hanins@ubnt.com>]

Hi Marcel,
On 2015.03.09. 18:21, Marcel Holtmann wrote:
> Hi Andrejs,
>
>>>> If you do not need BR/EDR, you can switch that off and it might free the radio resources you need for the many LE connections.
>>> Would someone please tell me how you do that?  I haven't seen this
>>> being done before.  Is it an HCI command?  ioctl command to the
>>> kernel?
>> ControllerMode = le
>> in /etc/bluetooth/main.conf
> which might at least need a 3.13.x kernel to actually work correctly. While the API is there, we have made significant fixes to the LE only mode in later kernels. Using a dual-mode controller in LE only mode actually needed some extra care.
>
> As I said, if it is not 3.18.x or 3.19.x kernel, then personally I would not bet on it. We have made sure that bug fixes are put into the -stable kernels for these release. Anything older has no guarantee anymore.
Sure, I noticed that lots of work has been done lately in regard to LE, 
so I'm indeed using 5.28 daemon@3.19.x kernel in LE-only mode and so far 
so good.
One of the useful things which still seems to be missing is the control 
over LE advertisements via D-Bus iface. "Discoverable" property change 
does not affect LE advs. I'm currently using 'hciconfig hci0 leadv' to 
make it work. But still, LE advs stop and do not re-start after adapter 
is connected/disconnected to some peripheral.
>
> Regards
>
> Marcel
>