visualization for environmental data using Highcharts
| environment variable | description | default |
|---|---|---|
| HTTP_HOST | network interface to bind to | undefined |
| HTTP_PORT | TCP port to listen on | 3282 |
| DATA_CO2 | where to get CO₂ data | http://localhost:3282/co2 |
| DATA_TEMP | where to get temperature data | http://localhost:3282/temp |
| LOG_STAMP | include timestamp in request log | false |
| LOG_METHOD | include request method in log | false |
| LOG_PATH | include request path in log | false |
| LOG_IP | include requester address in log | false |
| LOG_UA | include user agent string in request log | false |