Tado Internet State

Im new to HA & finding it challemging

I have a TADO smart thermostat system
I am trying to get HA to send a message to my phone if the TADO internet bridge goes down . I’m struggling to find a parameter to automat
I thought it was Connection state but thi doesnt seem to work

Any suggestions

I don’t have tado but you probably have some devices that are integrated using tado integration to home assistant. Home assistant is getting data for that devices using tado cloud services, probably.
If cloud service is down or internet is down those devices should became unavailable in home assistant. maybe you could use a trigger like if device or entity is unavailable…do this.