I could not find a way to natively do this. Here’s my use case:
- I have an outdoor freezer
- Freezer is plugged into a standard GFCI outlet
- occasionally the GFCI trips and I don’t know until I notice the freezer appears off the next time I use it. This has happened about 2 times in 3 years.
- I purchased a power plug like this: https://amzn.to/2MR1AXm in order to find out when the GFCI trips and to monitor power consumption
Issue: there’s no native way I was able to determine from Vera to “notify when device offline” so I had to get creative.
Fix: Installed Reactor App and build 2 simple “sensors”
Sensor 1: This is the one that I use to actively poll my device:
Sensor 2: This is the one I use to check on the failed consecutive poll attempts and send me a notification if too many fail
You would want to tweak how often you notify and poll based on your requirements. My notification in my example will notify me hourly once 5 or more consecutive poll attempts fail. I poll every 10 minutes so basically I will know if the freezer is offline for an hour or more. That was sufficient for my requirements.
Hope this helps someone else.