{
  "id": "id of the tile",
  "last_modified": 123456, // timestamp of last modification of the tile (or its items)
  "display_time": 5, // how long to display the tile in seconds
  "items": [
    {
      "refresh_every": 60, // delay between requests in seconds
      "type": "clock", // one of clock, icon, text, json, html, ...
      "x": 0, // position in "led pixel" along the x axis
      "y": 0, // position in "led pixel" along the y axis
    },
    {
      "type": "icon", // one of clock, icon, text, json, html, ...
      "x": 0, // position in "led pixel" along the x axis
      "y": 0, // position in "led pixel" along the y axis
      "content": "01101...",
      "width": 8 // number of leds for the width
    },
    {
      "type": "text", // one of clock, icon, text, json, html, ...
      "x": 0, // position in "led pixel" along the x axis
      "y": 0, // position in "led pixel" along the y axis
      "text": "Hello world !"
    },
    {
      "refresh_every": 180, // delay between requests in seconds
      "type": "json", // one of clock, icon, text, json, html, ...
      "x": 0, // position in "led pixel" along the x axis
      "y": 0, // position in "led pixel" along the y axis
      "url": "http://....",
      "login": "username", // optional login for the service
      "password": "password", // optional password for the service
      "cors-proxy": "https://....", // optional CORS proxy
      "path": "data.foo[2].bar", // path to access the value in the json
    },
    {
      "refresh_every": 300, // delay between requests in seconds
      "type": "html", // one of clock, icon, text, json, html, ...
      "x": 0, // position in "led pixel" along the x axis
      "y": 0, // position in "led pixel" along the y axis
      "url": "http://....",
      "login": "username", // optional login for the service
      "password": "password", // optional password for the service
      "cors-proxy": "https://....", // optional CORS proxy
      "selector": ".content #foo[itemprop=datePublished]", // dom selector to get the node
      "attribute": "src" // attribute of the node to get for the value (eg src, innerHTML...)
    }
  ]
}