Calling of an external script for additional failure detection

[B-G-T]

In order to increase safety even more, I would like to check also the alarm level of my smoke detector (conntected to a pin of the RPI).
The most flexible way to implement this would probably be an option to call an also external script in the polling routine.

Would it be possible to add such a feature to this plugin?

[precision]

This seems doable. I'll see if I can get some time this or next week to hack something together.