When mixing triggers and conditions, the piston only subscribes to the devices involved in the triggers, so yeah, it will check the state of condition related devices at those times, but won’t listen for their change. So if you say door is open (condition) and presence changes to present (trigger), the piston will only subscribe to presence changes. It will execute whenever presence changes, whether to present or not present. At those times, it checks the state of the door, but won’t execute when the door state changes.
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