I ended up using the answer in Ask Ubuntu:
https://askubuntu.com/a/871207/307523
The basic concept is you link your message to the last message you sent
with an extra line:
-h string:x-canonical-private-synchronous:anything
Where 'anything' is the string/text grouping your spamming bubbles
together so fast repeating one replaces the one before (in that same
group).
Code snippet from within larger while loop:
GetVolume
CurrVolume="$?"
# echo CurrVolume: $CurrVolume LastVolume: $LastVolume
if [[ "$CurrVolume" != "$LastVolume" ]] ; then
# Ask Ubuntu: https://askubuntu.com/a/871207/307523
notify-send --urgency=critical "tvpowered" \
-h string:x-canonical-private-synchronous:volume \
--icon=/usr/share/icons/gnome/48x48/devices/audio-speakers.png \
"Volume: $CurrVolume"
LastVolume=$CurrVolume
VolumeCnt=10
# TODO: Process VolumeCnt internally in loop instead of larger loop
fi
if [[ $VolumeCnt > 0 ]]; then
(( VolumeCnt-- ))
SleepTime=.01
else
SleepTime=2.5
fi
sleep $SleepTime
In the link comments point out how this only works in Ubuntu and not in
Gnome. It works fine in Ubuntu 16.04.7 LTS with Unity desktop but I
haven't tried it on other desktops yet
SleepTime of '0.01' is too small for real time but the bash script has
overhead of communicating to TV over WiFi which gives it about the '0.5'
seconds lag.
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libnotify in Ubuntu.
https://bugs.launchpad.net/bugs/257135
Title:
notify-send(1) can't replace an existing notification
Status in libnotify package in Ubuntu:
Confirmed
Status in libnotify package in Debian:
New
Bug description:
Binary package hint: libnotify-bin
Ubuntu 8.04, libnotify-bin 0.4.4-3build1.
notify-send(1) is very useful but it doesn't tell me the notification
ID that's been created, nor does it let me specify that to replace an
earlier notification. See http://www.galago-
project.org/specs/notification/0.9/x408.html#command-notify, in
particular the replaces_id parameter and the return value.
I'd like to be able to use it something like
id=$(notify-send --show-id foo)
sleep 60
notify-send --replace $id bar
This would be great for long-running shell scripts that are monitoring
something.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libnotify/+bug/257135/+subscriptions
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