[Solved] How to Implement Random Delay in OpenBeken for Roller Shutters Sunset/Sunrise Schedule

I use OpenBeken to control the opening of my roller shutters. I use the NTP driver to, among other things, retrieve the sunset and sunrise times and I would like to add a random delay to it.
Example: setChannel 10 $sunset+1800
I would like to replace 1800 with a variable like $RANDOM.
Which could give this if $RANDOM can be bounded.
setChannel 10 $sunset+$RANDOM
If the content of $RANDOM is a real number between 0 and 1 as is often the case, does the modulo operator exist ?
Which could give this for a random delay between 0 and 15 minutes :
setChannel 10 $sunset+($RANDOM*1000%15)*60

Sure, it sounds like a good idea. We already have modulo.
Here, here it is:
https://github.com/openshwprojects/OpenBK7231...mmit/beceed0d2b81f3f98f32e4f729886fa296edf156
The rand is just a C rand, it's a an integer in 0 to RAND_MAX range. The rand01 is float in 0 to 1 range.
Let me know if I can do anything more for you.

It was a very good idea. I have been using the solution since then. But I have not had enough time available to go further in its use.