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OH 3 Examples: Writing and using JavaScript Libraries in MainUI created Rules. timerMgr creates Timers and discusses timers quite a bit
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openHAB 3.0 my getting started notes: Rules The first block of code has a createTimer example
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Experimental Next-Gen Rules Engine Documentation 5 of : Actions is old but still valid and shows how to create a timer.
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Switch Light on/off on OH3 using ECMA script and HUE Dimmer Switch - #13 by msty shows a good example
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Global vars for OH3 Rules? - #2 by tsmit has another example