Hello,
I’m currently using a setup with orion->cygnus-> mongo <-sth-comet.
I’d like to use the API of sth-comet to query the mongodb data stored by Cygnus. Currently, the data is landing fine in mongo, but I’m not able to query the data with sth-comet. When I send a query to sth-comet I get a statuscode 200 with body:

{
"contextResponses": [
{
"contextElement": {
"attributes": [

],
"id": "einaireas14",
"isPattern": false,
"type": "AirQualityObserved"
},
"statusCode":

}
]
}

In the sth-comet container I can see the following error:

DEBUG GET /STH/v1/contextEntities/type/AirQualityObserved/id/einaireas14/attributes/temperature?hLimit=3&hOffset=0&dateFrom=2019-02-18T00:00:00.000Z&dateTo=2019-02-18T23:59:59.999Z

DEBUG Getting access to the raw data collection for retrieval...

WARN Error when getting the raw data collection for retrieval (the collection 'null' may not exist)

I am not able to figure out why the collection name that sth comet is looking for is ‘null’. Im not violating any database/collection naming rules of mongodb as far as I can see. Could you tell me what is going on?

Regards,
Ir. Wout Ypma
Data Scientist
M: +31 6 36197510
linkedin.com/in/wout-ypma/<http://www.linkedin.com/in/wout-ypma/>

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