Which snap interface allows accessing /dev/rfkill?

[Tonny Tzeng]

Hi,

I'd like to unblock the Bluetooth interface on Ubuntu Core, so I use
'stage-packages' keyword to install 'rfkill' package to my snap. If I
install the snap in devmode, the rfkill command works as expected. But if
the snap is installed in confined mode, I always get 'Permission denied',
and the /var/log/syslog shows below message:

Jan 19 09:17:42 localhost kernel: [177262.419927] audit: type=1400
audit(1484817462.015:2031): apparmor="DENIED" operation="open"
profile="snap.iotivity-smarthome-demo.rfkill" name="/dev/rfkill" pid=14430
comm="rfkill" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0

Would anyone help me which interface should I declare with the plugs
keyword?  I've tried hardware-observe and bluetooth-control interfaces but
no success. Any pointers would be appreciated, thanks in advance.

Best Regards,
Tonny
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