Rule to trigger notification when value is > number

Setup, Configuration and Use Beginners
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3

Take your requirements and break them down and implement them one by one.

  1. Get the water level. Done via “The Thing and Item with the level is working so far.”
  2. Trigger a rule when the water level updates. Done via “type: core.ItemStateUpdateTrigger”
  3. Send an alert when the water is over > 20. Done via “if (level.state > 20)”
  4. Only send an alert once when the water is > 20 until the water level drops below 20 again.

OK so that’s a little more complicated. Let’s break 4 apart into smaller steps.

4a. Send the alert. Done via “Int_level_max.sendCommand(ON)”
4b. Record when the alert was sent. privateCache.put('alertSent', true)
4c. Only send the alert if one hasn’t already been sent. if(privateCache.get('alertSent', [ | false]))
4d. All an alert to be sent again once the level has dropped to 20 or below.

else {
    privateCache.put('alertSent', false)
}

Putting it all together:

if(level.state > 20 && privateCache.get('alertSent', [ | false]) {
    Int_level_max.sendCommand(ON)
    privateCache.set('alertSent', true)
}
else {
    privateCache.set('alertSent', false)
}

Or, because I strongly recommend against new development of rules in Rules DSL, in Blockly:

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For a more capable approach that includes hystersis and do not disturb periods see Threshold Alert and Open Reminder [4.0.0.0;4.9.9.9] which can handle this use case. All you’d need to do is code the alert part and configure the rule with your Item, threshold as desired.