Control Android with Android

[jeromebernardjames]

Have an Android 5.1 and Android 5.1.1. Want to create a home security system so that I can either record or see in real time who is at my door. What is available and what would I need to do?

 

[hang-the-9]

There are lots of security systems like this. https://store.nest.com/product/nest-hello/NC5100US https://ring.com/ https://blinkforhome.com/ and so on.