Executing an action when down

[FoliniC]

Is it possible to execute a service when server is down?

I use this widget to monitor my buggy internet connection.
Often the problem is the router that stop working so I need to reboot it. The router as an old OpenWrt firmware with a ping reboot, but it isn't working.
So I wrote a pyscript to reboot it.
I didn't find a way to call this service without user intervention when uptime-card find that the connection is down.
Creating an automation based on the state it's a little cumbersome...
Another possibility is to trigger the script based on ko... I didn't realize what's the name I have to put in state_trigger...

@state_trigger("binary_sensor.internet == 'ko'") @service def reboot_router(action=None, id=None):