Tago Message format

Is there any documentation for message format that Tago accepts? It does enforce a tag called “variable” but other than that it appears to accept any valid JSON, however the fields other than a few (such as value, time, location etc.) are not persisted.

An example I tried:

{ "variable":"dummy",
  "value": [
       {
           "deviceid": "device 1",
           "updated": "2020-09-23T20:41:46.966Z"
       },
       {
           "deviceid": "device 2",
           "updated": "2020-09-23T20:42:46.966Z"
       }
   ]
}

This persisted successfully, however, not sure why I can not retrieve the objects under the value tag.

Thanks.

https://docs.tago.io/en/articles/34-sending-data