Trying to Pass Device list between Pistons

#1

1) Give a description of the problem
I have a generic piston that can turn ON a group of light switches (stored in a Device variable).
I would like to call that generic piston from a “master” piston that sets the Device variable to a device list corresponding to any of a variety of desired lighting scenes.

I tried 2 approaches. First, I created a global variable and simply called my generic piston.
Although this sometimes worked, it

2) What is the expected behavior?
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3) What is happening/not happening?
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4) Post a Green Snapshot of the pistonimage
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5) Attach any logs (From ST IDE and by turning logging level to Full)
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#2

I would create a second Global Variable that gets set to “True” after your device list Variable is populated. Then have your Generic Piston listen(trigger) from the True Global Variable.This is how I run an Arrival Piston with my Evaluate Sun State Piston. The Arrival Routine Sets a Waitstate variable, Presence variable, and a Verify variable. The Verify Variable is what triggers the Evaluate State Routine. The Waitstate variable keeps the the Arrival Piston form re-triggering the Evaluate State Piston. When two people arrive or one arrives behind another with in a 5 minute period. All of these are Global variables. They all get reset at the end of the piston run.