# Ding.js configuration

Ding.js configuration is composed of a JSON file that contains all information to setup the application.

* **mqtt**: broker settings (for The Things Network)
* **data**: an object that identifies the service of which the data will be received
  * **entities**: an array containing the keys that should be used from the `payload_fields` object.
* **metadata**: an array containing the metadata entities that could be related with the nodes (using the `dev_id`)
  * Optionally some entities could be served as endpoints

## Example configuration

```json
{
  "mqtt": {
    "service": "ttn",
    "protocol": "mqtt",
    "host": "eu.thethings.network",
    "user": "abc",
    "password": "xyz"
  },
  "data": {
    "ttn": [
      "temperature",
      "humidity",
      "motion",
      "light",
      "battery"
    ]
  },
  "metadata": [
    {
      "name": "location",
      "type": "string",
      "rest_endpoint": true
    },
    {
      "name": "contact",
      "type": "string"
    },
    {
      "name": "room",
      "type": "number",
      "rest_endpoint": true
    },
    {
      "name": "installation_date",
      "type": "timestamp"
    }
  ]
}
```