[Bluez-devel] How to bypass inquiry cache?

[Bluez-devel] How to bypass inquiry cache?

[Andreas Färber]

Hello,

How can I perform non-standard inquiries without caching?

I am using an HCI socket to start my inquiry but the results somehow  
appear to be cached - i.e. the RSSI doesn't change although it  
should, but does after I re-plug the dongle.

We tried setting the two maximum cache age defines in hci_core.c to  
zero but this made the whole inquiry run forever apparently.

Where in the kernel code is such caching handled? I only found the  
cache maintenance functions and inquiry ioctl handling in hci_core.*,  
the  cache updating in hci_event.c and one other reference to the  
cache limit in hci_conn.c - neither of those appeared to override the  
value returned to userland so I must've missed something...

Thanks for any hints!

Andreas

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Re: [Bluez-devel] How to bypass inquiry cache?

[Marcel Holtmann]

Hi Andreas,

> How can I perform non-standard inquiries without caching?
> 
> I am using an HCI socket to start my inquiry but the results somehow  
> appear to be cached - i.e. the RSSI doesn't change although it  
> should, but does after I re-plug the dongle.
> 
> We tried setting the two maximum cache age defines in hci_core.c to  
> zero but this made the whole inquiry run forever apparently.
> 
> Where in the kernel code is such caching handled? I only found the  
> cache maintenance functions and inquiry ioctl handling in hci_core.*,  
> the  cache updating in hci_event.c and one other reference to the  
> cache limit in hci_conn.c - neither of those appeared to override the  
> value returned to userland so I must've missed something...

simply use the D-Bus API for scanning. It does all you want.

Regards

Marcel



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