If you really want to do the catflap right, you need to know whether the cat is inside or outside… fortunatly there is a solution…
Surepet have a connected cat flap and someone has connected it to smarththings so you can automate stuff… eg turn on the garden light when they go outside, and turn it off when they come inside and also turn on the tv so they have something to listen to and look at!!!
you could even turn on the heating and have the connected food tray dispence food…
OK so kidding aside, you can connect the cat flap in an intellegent way. Also someone else took the knowhow on how this was done and then built an alexa skill… so you can find out who is inside or outside when talking to alexa.
To quote someone from work… ‘so you can stalk your cats now!’
seehttps://community.smartthings.com/t/release-sure-petcare-connect-v1-2b/172360 for more information