Re: [PATCH] Bluetooth: Enable duplicates filter in background scan

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Hi Andre,

> To avoid flooding the host with useless advertising reports during
> background scan, we enable the duplicates filter from controller.
> 
> However, enabling duplicates filter requires a small change in
> background scan routine in order to fix the following scenario:
>  1) Background scan is running.
>  2) A device disconnects and starts advertising.
>  3) Before host gets the disconnect event, the advertising is reported
>     to host. Since there is no pending LE connection at that time,
>     nothing happens.
>  4) Host gets the disconnection event and adds a pending connection.
>  5) No advertising is reported (since controller is filtering) and the
>     connection is never established.
> 
> So, to address this scenario, we should always restart background scan
> to unsure we don't miss any advertising report (due to duplicates
> filter).

don’t we need a timer that restarts the background scan in a regular interval?

Regards

Marcel

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