Smart Intercom with gate opening capability

I have an old intercom on my house and I want to replace it with a Smart Intercom able to send notification to a mobile App with video and audio support. The intercom should also act a security camera by record the rtsp stream to the SD Card.

So i have started the project starting from the following HW and SW components.

HW Components:

• RPi 4 Kit;
• USB mic;
• Speakers;
• RPi Camera;
• WiFi Relay;

SW Components:

• RTSP Server;
• Companion Services;
• Talkiepi;
• Mumla;

First of I connected all the components as depicted in the scehamtic below:

I started by installing the RTSP Server as a service following the rules in the repo above.

Than I written and setup the recording service. I setup talkiepi following the rules to modify the default audio interface to include the USB microphone.

Than I have written a firebase service to detect the button pressed events from the Mumla modified App.

Than I furthermore modified the Mumla App to call shelly cloud API to open the door from the App.

This is the resulting Android App:

Sorry for the italian labels ;-)