RescueTime FocusTime session starts. blink(1) Send blink event.

Turn on Blink(1) light when a FocusTime session starts

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This will send an event called "focus_on" to Blink(1) whenever a FocusTime session starts. You will need to define a pattern for the "focus_on" rule on your Blink(1), and you most likely will want to create a second recipe to handle the corresponding "focus_off" event when a FocusTime session is finished.