Alert when Nest Cameras haven't detected motion in 30 minutes

Hi all,

I’m trying to send myself a notification if any of my Nest cameras go offline and/or stop sending data.

I tried an automation where their statuses go to “unknown” or “unavailable”, but that didn’t work.

These cameras get constant motion alerts. So I’d be fine with an alert that ran if the cameras haven’t had a “motion” event any time in the last 1 hour.

Is someone able to help me set that up? I tried playing with timers and other various settings but can’t figure it out.

Thank you!