The server is up here, but it's password-protected and the ESP32 is not connected right now.

How it works

esp/

• ESP32 uses a photoresistor to detect light flashes on an energy meter
• Sends a timestamp over TCP+TLS to the server every time
• NGINX handles TLS and forwards

backend/

• Server saves timestamps and builds up indexes in files
• Server streams live timestamps and responds to requests from frontend via application-level protocol over websockets

web/

• NGINX handles HTTPS and forwards
• The API and indexes for viewing arbitrary graphs is implemented in the backend but only viewing live data was finished being implemented in the frontend