[Bluez-users] RE[2]: inquiry scan problems

[Bluez-users] RE[2]: inquiry scan problems

[Marco Trudel]

 > > [my description of the inquiry problems with java (jsr82)]
 > can your reproduce it without using any JSR-82 stuff?

yes. i tried the inquiries with "hcitool scan".
again, i do 5 and more inquiries in a row with one second sleep between 
inquiries single "hcitool scan"'s...

here what i noted:
- it needs in average 4 inquiries to get a new device after it's in 
rainge (4 single "hcitool scan" until it's visible).
- it needs in average 2 inquiries to see that a device is no longer in 
rainge (or has bluetooth disabled). the first new inquiry usually gives 
"n/a" as the friendlyName, the second one doesn't list it again.
does maybe bluez or my bluetooth dongle cache old inquiries or is there 
still radiation in the air :-) ?

- during scans, if nothin changes (no new/disappeared devices), the 
friendlyName changes to n/a for a single inquiry (very rare, but it happens)

- if multiple new devices come in rainge, old devices migt have a n/a 
friendlyName (the right one comes back in the next scan)


thanks for your time...

kind regards
Marco


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Re: [Bluez-users] RE[2]: inquiry scan problems

[Marcel Holtmann]

Hi Marco,

> yes. i tried the inquiries with "hcitool scan".
> again, i do 5 and more inquiries in a row with one second sleep between 
> inquiries single "hcitool scan"'s...
> 
> here what i noted:
> - it needs in average 4 inquiries to get a new device after it's in 
> rainge (4 single "hcitool scan" until it's visible).
> - it needs in average 2 inquiries to see that a device is no longer in 
> rainge (or has bluetooth disabled). the first new inquiry usually gives 
> "n/a" as the friendlyName, the second one doesn't list it again.
> does maybe bluez or my bluetooth dongle cache old inquiries or is there 
> still radiation in the air :-) ?

for me this sounds more like a job periodic inquiry.

Regards

Marcel




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Re: [Bluez-users] RE[2]: inquiry scan problems

[Marco Trudel]

Hello Marcel

what do you mean by "job periodic inquiry"?
what is this? i don't know what this means...

kind regards
Marco Trudel


Marcel Holtmann wrote:
> Hi Marco,
> 
> 
>>yes. i tried the inquiries with "hcitool scan".
>>again, i do 5 and more inquiries in a row with one second sleep between 
>>inquiries single "hcitool scan"'s...
>>
>>here what i noted:
>>- it needs in average 4 inquiries to get a new device after it's in 
>>rainge (4 single "hcitool scan" until it's visible).
>>- it needs in average 2 inquiries to see that a device is no longer in 
>>rainge (or has bluetooth disabled). the first new inquiry usually gives 
>>"n/a" as the friendlyName, the second one doesn't list it again.
>>does maybe bluez or my bluetooth dongle cache old inquiries or is there 
>>still radiation in the air :-) ?
> 
> 
> for me this sounds more like a job periodic inquiry.
> 
> Regards
> 
> Marcel
> 
> 
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now. 
> http://productguide.itmanagersjournal.com/
> _______________________________________________
> Bluez-users mailing list
> Bluez-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-users
> 
> 


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Re: [Bluez-users] RE[2]: inquiry scan problems

[Marcel Holtmann]

Hi Marco,

> what do you mean by "job periodic inquiry"?
> what is this? i don't know what this means...

look at the HCI part of the Bluetooth specification for the commands and
events for periodic inquiry.

Regards

Marcel




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