Created question in FIWARE Q/A platform on 06-12-2018 at 16:12
Please, ANSWER this question AT https://stackoverflow.com/questions/53654763/how-to-make-exposed-locally-json-data-seen-as-context-provider-by-fiware-orion-c

Question:
How to make exposed locally JSON data seen as Context Provider by FIWARE Orion Context Broker?

Description:
I think that I am doing everything alright, but I still cannot make JSON data exposed on my local server to be seen as Context Provider by FIWARE Orion Context Broker.

SETUP

I have whole Orion Context Broker all setup and running after following this commands:

docker pull mongo:3.6
docker pull fiware/orion
docker network create fiware_default

docker run -d --name=mongo-db --network=fiware_default \
--expose=27017 mongo:3.6 --bind_ip_all --smallfiles
docker run -d --name fiware-orion -h orion --network=fiware_default \
-p 1026:1026 fiware/orion -dbhost mongo-db

ENTITIES

I also added one Store entity (from https://github.com/Fiware/tutorials.Getting-Started tutorial) by running:

curl -iX POST \
'http://localhost:1026/v2/entities' \
-H 'Content-Type: application/json' \
-d '
{
"id": "urn:ngsi-ld:Store:001",
"type": "Store",
"address": {
"type": "PostalAddress",
"value":

},
"location": {
"type": "geo:json",
"value":

},
"name":

}'

Moreover I also successfully registered my Context Provider:

curl -iX POST 'http://localhost:1026/v2/registrations' -H 'Content-Type: application/json' -d '{
"description": "Temperature Provider",
"dataProvided": {
"entities": [

],
"attrs": [
"temperature"
]
},
"provider": {
"http":

,
"legacyForwarding": true
}
}'

CONTEXT PROVIDER

I exposed locally my Context Provider (exposed by my SpringBoot application written in Java 10) at http://localhost:8080/temperature. The JSON data (returned in html body) looks like that:

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

],"id":"urn:ngsi-ld:Store:001","isPattern":"false","type":"Store"},"statusCode":{"code":"200","reasonPhrase":"OK"}}]}

PROBLEM

When I try to get other entity's attributes (like name or location) it works fine, but when I try to get temperature attribute with this query:

curl -X GET 'http://localhost:1026/v2/entities/urn:ngsi-ld:Store:001/attrs/temperature/value'

I get the following error:

The only one error log in the Context Broker docker is:

time=Thursday 06 Dec 15:29:37 2018.751Z | lvl=WARN | corr=N/A | trans=N/A | from=N/A | srv=N/A | subsrv=N/A | comp=Orion | op=postQueryContext.cpp[146]:queryForward | msg=Runtime Error (error forwarding 'Query' to providing application)