This is a simple webserver written in golang. It is designed to run on a Raspberry Pi and access its GPIO pins.
The server periodically checks GPIO14 for input. The input is expected to come from a brightness sensor that sends a Low signal when light is above a certain threshold and a high signal otherwise.
The state can be queried by a http request to http://<hostname>:8000/api/v1/occupied which also returns the duration
of the current state in seconds. The sensor can be queried directly by calling http://<hostname>:8000/api/v1/light
Compile this code with GOOS=linux and GOARCH=arm