I am looking for a way to trigger some emails from my temperature sensor. It should be an email like: “if T is below 20 then send email to…”. This works fine, but then it seems I get the emails all the time. What I want is that it sends the email only once, then waits until next time the T drops below 20. So I get warned only once if that happens.
How would I implement that? Anyone any ideas? Or am I overlooking something?
Is it possible to disable this rule and then have another rule that, when the T rises, enables it again?