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Sync is excellent but doesn’t support this yet.
Flood/water sensors:
Smart valve on mains water supply so you can automatically cut off water to the entire house if any of your leak sensors alert.
You could then call a friend or family member and ask them to check on it.
Or if you had it on a smart outlet you could try rebooting it.
If you live in a climate in which you need to winterize your outdoor faucets (e.g. by shutting a valve in your basement, crawlspace, or garage) a temperature sensor on the warm side of the valve can save you from a flood.
I had to replace the garage door opener one winter and failed to notice a new quarter inch gap at the bottom of the garage door. Combine that with a cold snap and the garage dropped below freezing for long enough to burst pipes.
Fortunately I had a Shelley flood sensor on the floor so I was alerted fairly early and was able to avoid serious damage, but had I been paying attention to the pipes themselves I could have avoided a plumber call-out on Christmas Eve!
This is not my comment from the Play store, it’s from another Sync user having a similar issue:
Play store link: Sync for Lemmy