Very crude, but still works.

• iot-gateway: Node.js server, with thermostat engine, HTTP API and redis logging logic
• link-device-common: generic C++ firmware for ESP8266
• web: Next.js web interface, with stats, charts and programming

You can use docker-compose to set up the environment:

git clone https://github.com/giulioz/termostato.git
cd termostato
docker-compose build
docker-compose up -d

Remember that this wasn't built to be hosted everywhere, there may be customizations, hacks or absolute URLs everywhere.