Hi there dear OpenWrt community!
I've just done those two funny scripts and I thought I'd share it with the broader audience, maybe you'll find it useful too 
kmod-ledtrig-pattern-morse
useful scripts to translate text-to-morse and then morse-to pattern that is used by kmod-ledtrig-pattern
it requires bash to work
echo some text and pipe it to text-to-morse.sh
# echo "wan ping failed" | ./text-to-morse.sh
.-- .- -. / .--. .. -. --. / ..-. .- .. .-.. . -.
echo the morse code and pipe it to morse-to-pattern.sh
echo ".-- .- -. / .--. .. -. --. / ..-. .- .. .-.. . -.." | ./morse-to-pattern.sh
1 75 0 75 1 225 0 75 1 225 0 75 0 150 1 75 0 75 1 225 0 75 0 150 1 225 0 75 1 75 0 75 0 150 0 150 0 150 1 75 0 75 1 225 0 75 1 225 0 75 1 75 0 75 0 150 1 75 0 75 1 75 0 75 0 150 1 225 0 75 1 75 0 75 0 150 1 225 0 75 1 225 0 75 1 75 0 75 0 150 0 150 0 150 1 75 0 75 1 75 0 75 1 225 0 75 1 75 0 75 0 150 1 75 0 75 1 225 0 75 0 150 1 75 0 75 1 75 0 75 0 150 1 75 0 75 1 225 0 75 1 75 0 75 1 75 0 75 0 150 1 75 0 75 0 150 1 225 0 75 1 75 0 75 1 75 0 75
or do it at once, and redirect to led pattern directly
# echo pattern > /sys/class/leds/mdio-bus:0f:amber:wan/trigger
# echo "wan ping failed" | ./text-to-morse.sh | ./morse-to-pattern.sh 75 5000 > /sys/class/leds/mdio-bus:0f:amber:wan/pattern
the morse-to-pattern.sh accepts two arguments
# ./morse-to-pattern.sh [DIT PAUSE]
- DIT is the lenght of morse code "time unit" in milliseconds
- DOT is equal to DIT
- DASH is 3*DIT
- PAUSE in milliseconds is added to the end of the message