Certificate introspection in real time

Hello,

I'm constructing a smart home environment, and I want to control the traffic of my devices. For this, I want to do some type of app (proxy-based) that inspects in real-time the packets that are received and sent, and if the certificate authority matches with one specific that I want (my own), I allow the connection, instead, I drop/block it. It is possible to do this with scapy?

Is there any tool that you know that already make this?

Thank you.