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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https://bugs.launchpad.net/bugs/257135
Title:
notify-send(1) can't replace an existing notification
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