Thank you for your valuable input.
Unfortunately, in my case, I hook my own GATT server into BlueZ using
D-Bus API and I am looking for the way to change the supervision
timeout on the fly.
I looked at hcitool source code and found the command "hcitool lst"
command which seems to be usable for changing the supervision timeout
param. However, I got error message while executing it. It seems
really odd because I got no problem when listing the current
connection using "hcitool conn".
~ # hcitool conn
Connections:
< LE 00:16:B6:29:7F:F0 handle 100 state 1 lm MASTER
~ # hcitool lst 00:16:B6:29:7F:F0
Get connection info failed: No such file or directory
My kernel version is 3.14.43
Any suggestion would be great.
Regards,
Hieu.
On Thu, Oct 6, 2016 at 11:09 PM, Joseph Hwang <josephsih@xxxxxxxxxx> wrote:
> I modified the supervision timeout by changing the constant in kernel. I did
> this as an experiment to see if a longer supervision timeout helps improving
> the connection stability. You need to make and update kernel by yourself
> though. There might be a better way...
>
> If you need it, the patch looks like
>
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
>
> index 9e58c0c..17b9bba 100644
>
> --- a/net/bluetooth/hci_core.c
>
> +++ b/net/bluetooth/hci_core.c
>
> @@ -2960,7 +2960,7 @@ struct hci_dev *hci_alloc_dev(void)
>
> hdev->le_conn_min_interval = 0x0028;
>
> hdev->le_conn_max_interval = 0x0038;
>
> hdev->le_conn_latency = 0x0000;
>
> - hdev->le_supv_timeout = 0x002a;
>
> + hdev->le_supv_timeout = 0x00c8;
>
> hdev->le_def_tx_len = 0x001b;
>
> hdev->le_def_tx_time = 0x0148;
>
> hdev->le_max_tx_len = 0x001b;
>
>
> Joseph
>
>
> On Wed, Oct 5, 2016 at 11:37 PM, Hieu Le <hieu.le@xxxxxxxxxxxxxxxx> wrote:
>>
>> Hello,
>>
>> I am using BlueZ-5.39 to develop my application which creates a GATT
>> server and uses BlueZ D-Bus method call "RegisterProfile" to hook
>> itself to Bluetooth daemon.
>>
>> The application is working fine. However, I want to change the default
>> supervision timeout because Central and Peripheral sometimes got
>> disconnected when moving away.
>>
>> I searched all the document. Unfortunately, I cannot find any D-Bus
>> API to accomplish it.
>>
>> Could you please suggest me any solution for this?
>>
>> Many thanks for your valuable input.
>> Hieu
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-bluetooth"
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>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
>
>
> --
>
> Joseph Shyh-In Hwang
> Email: josephsih@xxxxxxxxxx
>
--
---- Hieu Le ---
--
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