Bluetooth wireless activity triggers udev rule

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

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).


events caused by plugging in USB Bluetooth dongle:

UDEV  [883613218.457062] add     
/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0 (bluetooth)
UDEV_LOG=3
ACTION­d
DEVPATH=/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0
SUBSYSTEM=bluetooth
SEQNUM17
UDEVD_EVENT=1

UDEV  [883613231.342314] add     
/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0/acl000F3D5F7205
(bluetooth)
UDEV_LOG=3
ACTION­d
DEVPATH=/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0/acl000F3D5F7205
SUBSYSTEM=bluetooth
SEQNUM25
UDEVD_EVENT=1



Events caused by trying to connect to the USB Bluetooth dongle from
another Bluetooth device:

UDEV  [883613131.133343] add     
/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0/acl000F3D5F7205
(bluetooth)
UDEV_LOG=3
ACTION­d
DEVPATH=/devices/platform/at91_ohci/usb1/1-1/1-1.2/1-1.2:1.0/hci0/acl000F3D5F7205
SUBSYSTEM=bluetooth
SEQNUM)5
UDEVD_EVENT=1


Aras Vaichas


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