How to supervise devices

Configuration
1

Hi,

I want to supervise my devices if any of them go offline and get alerted if this happens.
Is there any easy integration which does this?
I tried the ping integration, but

  1. You have to add it for each device separately.
    It would be nice to simply add the devices to a list like if you create an automation to turn on several lights/switches)
  2. The interval is fixed to 30s.
    If you want another interval, you need to disable the automatic check and create your own automation.

I want to use home assistant also for a light-weight security system, so it’s bad if a device is offline and it doesn’t get detected.
And the interval of 30s is a bit much since it is easy to open and close a door within 30s.

(I tried to search for this as I think also others want to supervise their devices, but the search results in dozens of “Home Assisstant Supervisor” topics).

2

You are fighting a technological problem here.
The problem is that when a device loose power or crash, then it is unable to report it.
Your only option is. A reverse test, like ping, but ping packets can be lost too, so you might get false positive, and some devices can’t be pinged at all, like Zigbee and Z-wave.

You might be able to look at events, instead of states and that way capture updates, that will not be written to the state machine due to not being a changed value, but I am not certain about it.