I’m actually trying to write a app that will do color transitions for light platforms that do not support the “transition” attribute for light.turn_on(). The problem is that the AppDaemon.run_in function does not support fractional time so the transitions look pretty stroboscopic :-).
As well the AppDaemon API documentation is strongly advising not to use time.sleep() or similar as that will block the worker thread.
So is there any other way how a AppDeamon app could do rapid changes over potentially long period of time without blocking the worker ?
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I would love to see this
At this point no, but it is something that may be interesting for the future.
Blocking 1 thread for a few seconds while you do a light effect should be fine though, as long as you don;t keep it busy forever.
actually it is currently pretty lame, but feel free to have a look:
https://github.com/pezinek/Home-AssistantConfig/blob/master/appdaemon/apps/smooth_light.py
OK, I’ll try to block a single thread during transitions then and will see how it will perform.
Chances are that a rapid changes like these will clog the homeassistant’s event queue and fast transitions will not be acceptably smooth anyway 
(running it on the very first version of rabsperry pi model B 
But thanks anyway !
Edit:
After going synchronous with time.sleep() my HW was able to do 1.6 color changes per second (instead of the original 1) so if you are considering the possibility to make appdaemon.run_in able to handle fractions of seconds, then just FIY, I don’t need it anymore
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