I'm not sure if you still need these answered but I think you're overthinking this app a bit. Bending our minds to understand RM has caused permanent damage..lol.
Anyway, you can think of these more like basic ST app.
If you select when "Sensor opens" you will get notified as soon as the sensor becomes opened. Like a trigger I guess.
For how long - simply how long the sensor needs to stay open before sending the notification.
In RM speak: Delay notification (this long) Cancel on truth change.
Frequency - you won't get notifications for every event. If a new event occurs outside of the set time frame, you will get the notification. Eg. If you set this value to 10 minutes, and you open and close the sensor 100 times in 10 minutes, you will only get one notification. If you open and close the sensor again in the 11th minute, you will get another notification and the timer begins again.
I'm new to hubitat but have SMS from notifications working Except they do not appear to be limited to "Only once within this number of minutes" parameter of the notification rule. Since finding out about the 10 SMS limit per day I've written a temperature rule to give me a reading 4 times a day or once every 360 minutes. Unfortunately, I appear to get an arbitrary number of notifications sent to SMS. Any ideas what's gone wrong! Thanks for any help!. Best regards, Mike
No, there is no issue with this. There was sort of an issue about 'only once within X minutes', but that's been fixed. That issue was that it was only using X minute windows starting every X minutes of the hour, as opposed to an X minute window starting when the notification went out. There may well have been other effects from this, including mishandling of windows longer than an hour.
On a similar train of thought, I'm trying to understand how "sensor close" logic works when it accompanies "sensor open".
For example, I have a notification setup on a contact sensor (door). I selected notification on open and on close, and I set "For how long?" to 5 minutes. Does the 5 minute delay apply to both the open and close? What I would want is for the notification to be sent after the contact is open for 5 minutes, but then notify immediately upon that same sensor closing. For gates, doors, garages, etc., that seems to be a more sensible interpretation.
Is that how it works? Or does the "on-close" notification also wait for the sensor to be closed for 5 minutes? I've read all the documentation, and it doesn't say (or I can't tell). I've tried just running tests, but I'm not sure what's hub latency versus Notifications logic. Anyone know how it's supposed to work?
If you want notifications from both open and close, you should use two different Notifiers. While it has both selections available, it is intended to be used for just one at a time. That would clarify for you what the timing means.