Fiware Context Provider hello world not working - fiware

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"
]
}