Re: Bluetooth wireless activity triggers udev rule

[Aras Vaichas <arasv@magtech.com.au>]

Kay Sievers wrote:
> On Wed, Aug 13, 2008 at 06:04, Aras Vaichas <arasv@magtech.com.au> wrote:
>   
>> Hi, I'm currently integrating runit and udev. I have a udev rule which
>> runs my Blue-Z startup scripts when I plug in the USB BT dongle:
>>
>> ACTION="add", ENV{SUBSYSTEM}="bluetooth", RUN+="/usr/bin/sv up bluetooth"
>>
>> This works really well, cold plugging, etc. No problems.
>>
>> I've found an interesting quirk though. Here is the sequence of events:
>>
>> Computer A: I start up my system with the BT dongle inserted, the Blue-Z
>> scripts are started via udev coldplugging script
>> Computer B: I set up a task which searches for BT devices and tries to
>> form a PPP connection
>> Computer B: Detects the BT dongle on Computer A, records the address and
>> forms a PPP connection
>> Computer A: I disable the Blue-Z scripts # sv down bluetooth
>> Computer B: Attempts to connect to A again, and sends a BT signal to
>> connect ...
>> Computer A: The BT dongle sends a wireless wakeup (wake-on-lan?) signal
>> which causes udev to run the Blue-Z utils startup script again ...
>>
>> I looked at the udev events to see what was happening when Computer B
>> tried to connect to Computer A. It appears that the two series of events
>> are nearly identical.  Can someone suggest a way for me to start the
>> Blue-Z utils *only* when the USB dongle is *inserted* (or first detected).
>>     
>
> Match only on the the hci* creation events?
> ACTION="add", KERNEL="hci[0-9]*", SUBSYSTEM="bluetooth",
> RUN+="/usr/bin/sv up bluetooth"
Yes, that works. USB Bluetooth device insertion will trigger the
bluetooth scripts, but bluetooth network activity will not trigger the
script. This is good.

Thank you.

Aras

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