Retrieve features

{
  "topic": "com.acme/xdk_53/things/twin/commands/retrieve",
  "headers": {},
  "path": "/features"
}

{
  "topic": "com.acme/xdk_53/things/twin/commands/retrieve",
  "headers": {},
  "path": "/features",
  "value": {
    "accelerometer": {
      "properties": {
        "x": 3.141,
        "y": 2.718,
        "z": 1,
        "unit": "g"
      }
    }
  },
  "status": 200
}