Created question in FIWARE Q/A platform on 06-12-2018 at 16:12
Please, ANSWER this question AT https://stackoverflow.com/questions/53654763/do-i-need-any-proxy-to-make-context-provider-visible-by-fiware-orion-context-bro

Question:
Do I need any proxy to make Context Provider visible by FIWARE Orion Context Broker?

Description:
I cannot get an attribute from registered Context Provider in Orion Context Broker installed from docker. Do I need something more (e.g. special context proxy?)

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://192.168.xxx.xxx:8080/temperature. The JSON data (returned in html body) is in NSGI v1 format and looks like that:

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

],
"id": "urn:ngsi-ld:Store:001",
"isPattern": "false",
"type": "Store"
},
"statusCode":

}
]
}

PROBLEM

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

curl -X GET 'http://192.168.xxx.xxx:1026/v2/entities/urn:ngsi-ld:Store:001/attrs/temperature/value'

I get the following error:

Logs in the Context Broker docker:

time=2018-12-07T09:18:02.846Z | lvl=WARN | corr=N/A | trans=N/A | from=N/A | srv=N/A | subsrv=N/A | comp=Orion | op=AlarmManager.cpp[405]:badInput | msg=Raising alarm BadInput 192.168.115.126: JSON Parse Error: unknown field: /timestamp
time=2018-12-07T09:18:02.847Z | lvl=WARN | corr=N/A | trans=N/A | from=N/A | srv=N/A | subsrv=N/A | comp=Orion | op=postQueryContext.cpp[196]:queryForward | msg=Internal Error (error parsing reply from prov app: )

Do I need something more in my setup to make this Context Provider work (e.g. special context proxy)?