liu-xiao-guo@localhost:~$ sudo  journalctl --no-pager -u snap.bluez.bluez.service
-- No entries --
liu-xiao-guo@localhost:~$ snap interfaces
Slot                    Plug
bluez:service           sensortag:bluez
:bluetooth-control      -
:firewall-control       -
:fuse-support           -
:hardware-observe       -
:home                   -
:kernel-module-control  -
:locale-control         -
:log-observe            -
:lxd-support            -
:mount-observe          -
:network                sensortag,webcam-app
:network-bind           sensortag,webcam-app
:network-control        -
:network-observe        -
:opengl                 -
:ppp                    -
:process-control        -
:removable-media        -
:snapd-control          -
:system-observe         -
:system-trace           -
:timeserver-control     -
:timezone-control       -
:tpm                    -
-                       bluez:client
-                       snapweb:network
-                       snapweb:network-bind
-                       snapweb:snapd-control
-                       webcam-app:camera