Fiware Context Provider hello world not working

Question

I'm trying to register a Context Provider as source for several KPIs.

So far, it seems registering might be working, as GET http://{{orion}}/v2/registrations returns something similar to what I set in creation:

{
    // each registering a new id is returned: "id": "60991a887032541f4539a71d",
    "description": "City Inhabitants",
    "dataProvided": {
        "entities": [
            {
                "id": "city.inhabitants"
                //,"type": "KeyPerformanceIndicator"
            }
        ]
    },
    "provider": {
        "http": {
            "url": "http://myhost/v2/inhabitants"
        }
        //, "legacyForwarding": false //perhaps there's a bug, cause although unset or set to false, broker still returns true.
    }
}

However GET http://{{orion}}/v2/entities/city.inhabitants results in:

{
    "error": "BadRequest",
    "description": "Service not found. Check your URL as probably it is wrong."
}

GET http://{{orion}}/v2/entities?type=KeyPerformanceIndicator returns [] and context-provider is not being invoked any way.

I'm coding a Node.js application from scratch, to better understand what's going on https://github.com/FIWARE/tutorials.Context-Providers, and using tutorial containers as actual Fiware Broker, so all stores/shelf/products are working but not my KPI.

Answer 1

Using the tutorial application where a microservice is listening on the http://context-provider:3000/random/weatherConditions POST endpoint.

The following registration:

curl -L -X POST 'http://localhost:1026/v2/registrations' \
-H 'Content-Type: application/json' \
--data-raw '{
   "description": "Get Weather data for KPI 1",
   "dataProvided": {
     "entities": [
       {
         "id" : "urn:ngsi-ld:KPI:010",
         "type": "KeyPerformanceIndicator"
       }
     ],
     "attrs": [
      "temperature", "relativeHumidity"
    ]
   },
   "provider": {
     "http": {
       "url": "http://context-provider:3000/random/weatherConditions"
     },
     "legacyForwarding": false
   },
   "status": "active"
}'

Will forward and retrieve data for the following request:

curl -L -X GET 'http://localhost:1026/v2/entities/urn:ngsi-ld:KPI:010'

or

curl -L -X GET 'http://localhost:1026/v2/entities/?type=KeyPerformanceIndicator'

Returns:

{
    "id": "urn:ngsi-ld:KPI:010",
    "type": "KeyPerformanceIndicator",
    "temperature": {
        "type": "Number",
        "value": 11,
        "metadata": {}
    },
    "relativeHumidity": {
        "type": "Number",
        "value": 39,
        "metadata": {}
    }
}

The context broker is forwarding the request to the http://context-provider:3000/random/weatherConditions POST end-point with the following payload:

{
 "entities": [
  {
   "id": "urn:ngsi-ld:KPI:010",
   "type": "KeyPerformanceIndicator"
  }
 ],
 "attrs": [
  "temperature",
  "relativeHumidity"
 ]
}