Created question in FIWARE Q/A platform on 27-01-2017 at 15:01
Please, ANSWER this question AT http://stackoverflow.com/questions/41895831/fiware-orion-context-broker-subscription-not-sent-to-sth-conditions-was-supp

Question:
Fiware - Orion Context Broker subscription not sent to STH, "conditions was supposed to be an array"

Description:
When trying to use STH to be able to store and retrieve data sent to OCB, I have a problem making the subscription.

My problem is that the subscription creation goes well.
When I create the subscription as following:

POST /v1/contextSubscriptions HTTP/1.1
Host: <cb_host>:1026
Content-Type: application/json
Fiware-Service: myService
Fiware-ServicePath: /myServicePath
Cache-Control: no-cache

{
"entities": [

{ "type": "cameraSimple", "isPattern": "true", "id": "sensor03" }

],
"attributes": [
"class"
],
"reference": "http://<cb_host>:8666/notify",
"duration": "P1M",
"notifyConditions": [

{ "type": "ONCHANGE", "condValues": [ "class" ] }

],
"throttling": "PT5S"
}

I receive following answer:

{
"subscribeResponse":

{ "subscriptionId": "588b4f38e2066a50fa98df9b", "duration": "P1M", "throttling": "PT5S" }

}

but on the Fiware server, i see an error about the conditions in the terminal running the containers, and another one about the attributes:

orion | ERROR@14:06:10 safeMongo.cpp[302]: Runtime Error (field 'conditions' was supposed to be an array but type=4 in BSONObj <{ _id: ObjectId('588b4f96e2066a50fa98df9c'), expiration: 1488116886, reference: "http://<cb_host>:8666/notify", custom: false, throttling: 5, servicePath: "/myServicePath", status: "active", entities: [

{ id: "sensor03", isPattern: "true", type: "cameraSimple", isTypePattern: false }

], attrs: [ "class" ], metadata: [], blacklist: false, conditions: [ "class" ], expression:

{ q: "", mq: "", geometry: "", coords: "", georel: "" }

, format: "JSON" }> from caller mongoSubCacheItemInsert:221)
orion | ERROR@13:48:10 safeMongo.cpp[302]: Runtime Error (field 'attrs' was supposed to be an array but type=4 in BSONObj <{ _id: ObjectId('588b4f96e2066a50fa98df9c'), expiration: 1488116886, reference: "http://<cb_host>:8666/notify", custom: false, throttling: 5, servicePath: "/myServicePath", status: "active", entities: [

{ id: "sensor03", isPattern: "true", type: "cameraSimple", isTypePattern: false }

], attrs: [ "class" ], metadata: [], blacklist: false, conditions: [ "class" ], expression:

{ q: "", mq: "", geometry: "", coords: "", georel: "" }

, format: "JSON" }> from caller mongoSubCacheItemInsert:215)

Also, when updating a value on my entity,

PUT /v2/entities/sensor03/attrs/class/value HTTP/1.1
Host: <cb_host>:1026
Accept: application/json
Fiware-Service: myService
Fiware-ServicePath: /myServicePath
Cache-Control: no-cache

"monitor"

I get nothing when querying the STH:

GET /STH/v1/contextEntities/type/myDevice/id/sensor03/attributes/class?lastN=10 HTTP/1.1
Host: <cb_host>:8666
Accept: application/json
Fiware-Service: myService
Fiware-ServicePath: /myServicePath
Cache-Control: no-cache

returns:

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

{ "name": "class", "values": [] }

],
"id": "sensor03",
"isPattern": false,
"type": "myDevice"
},
"statusCode":

{ "code": "200", "reasonPhrase": "OK" }

}
]
}

Note:

I use NGSI V1, as I suspect V2 is not yet supported for STH receiving NGSI V2 notifications regarding this issue.
Also i didn't find any documentation regarding "Getting historical raw context information" with NGSI V2, e.g on this page
I use Docker-machine with a single Debian 8 VM running on Fiware-Lab with following images:

mongodb:
image: mongo:2.6
hostname: mongodb
container_name: mongodb
command: --smallfiles

orion:
image: fiware/orion:develop
hostname: orion
container_name: orion
links:

• mongodb
  expose:
• "1026"
  ports:
• "1026:1026"
  command: -dbhost mongodb

fiware-sth-comet:
image: telefonicaiot/fiware-sth-comet
links:

• mongodb
  ports:
• "8666:8666"
  environment:
• STH_HOST=0.0.0.0
• DB_URI=mongodb:27017

EDIT 1: After removing the "develop" of Orion Docker image I am now running verison "1.6.0-next" of Orion, and I don't have any more the runtime error. Still, I can't get any historical value of the attributes of the entity. I must be doing some error in the request, but I don't know where.

Now my docker-compose file looks like this:

mongo:
image: mongo:3.2
command: --nojournal

orion:
image: fiware/orion
links:

• mongo
  ports:
• "1026:1026"
  command: -dbhost mongo

fiware-sth-comet:
image: telefonicaiot/fiware-sth-comet
links:

• mongo
  ports:
• "8666:8666"
  environment:
• STH_HOST=0.0.0.0
• DB_URI=mongo:27017

cygnus:
image: fiware/cygnus-ngsi
links:
-mongo

EDIT 2: Following @GermánTorodelValle advice, I try to simulate a notification to the STH container like the CB would send:

curl -X POST -H "Accept: application/json" -H "Content-Type: application/json" -H "Fiware-Service: myService" -H "Fiware-ServicePath: /myServicePath" -d '{
"subscriptionId" : "57a9ce8ae997e37e85a4be39",
"originator" : "orion.contextBroker.instance",
"contextResponses" : [
{
"contextElement" : {
"attributes" : [

{ "name" : "class", "type" : "Text", "value" : "monitor" }

],
"type" : "cameraSimple",
"isPattern" : "false",
"id" : "sensor03"
},
"statusCode" :

{ "code" : "200", "reasonPhrase" : "OK" }

}
]
}' "http://172.17.0.1:8666/notify"

The log on STH container is as following:

time=2017-02-02T13:50:36.809Z | lvl=ERROR | corr=39638217-c300-48c0-9122-bff6164d5298 | trans=39638217-c300-48c0-9122-bff6164d5298 | op=OPER_STH_POST | from=n/a | srv=myService | subsrv=/myServicePath | comp=STH | msg=Error when getting the raw data collection for storing:MongoError: db already exists with different case already have: [sth_myservice] trying to create [sth_myService]
time=2017-02-02T13:50:36.810Z | lvl=WARN | corr=c322ddc8-2140-484b-a123-4e5b9b60742e | trans=c322ddc8-2140-484b-a123-4e5b9b60742e | op=OPER_STH_POST | from=n/a | srv=myService | subsrv=/myServicePath | comp=STH | msg=POST /notify, event={"request":"1486043436805:3577e9b29ee6:1:iym1stlz:10018","timestamp":1486043436810,"tags":["handler","error"],"data":{"msec":3.6443320512771606,"error":"db already exists with different case already have: [sth_myservice] trying to create [sth_myService]","data":{"name":"MongoError","message":"db already exists with different case already have: [sth_myservice] trying to create [sth_myService]","ok":0,"errmsg":"db already exists with different case already have: [sth_myservice] trying to create [sth_myService]","code":13297,"isBoom":true,"isServer":true,"data":null,"output":{"statusCode":500,"payload":

{"statusCode":500,"error":"Internal Server Error","message":"An internal server error occurred"}

,"headers":{}}}},"internal":true}
time=2017-02-02T13:50:36.812Z | lvl=ERROR | corr=6c864793-c7ef-462a-a43d-75cdae8d20a3 | trans=6c864793-c7ef-462a-a43d-75cdae8d20a3 | op=OPER_STH_POST | from=n/a | srv=myService | subsrv=/myServicePath | comp=STH | msg=POST /notify, event={"request":"1486043436805:3577e9b29ee6:1:iym1stlz:10018","timestamp":1486043436811,"tags":["internal","error"],"data":{"name":"MongoError","message":"db already exists with different case already have: [sth_myservice] trying to create [sth_myService]","ok":0,"errmsg":"db already exists with different case already have: [sth_myservice] trying to create [sth_myService]","code":13297,"isBoom":true,"isServer":true,"data":null,"output":{"statusCode":500,"payload":

{"statusCode":500,"error":"Internal Server Error","message":"An internal server error occurred"}

,"headers":

{"content-type":"application/json; charset=utf-8","cache-control":"no-cache","content-length":96}

}},"internal":true}
time=2017-02-02T13:50:38.143Z | lvl=INFO | corr=n/a | trans=n/a | op=OPER_STH_SERVER_LOG | from=n/a | srv=n/a | subsrv=n/a | comp=STH | msg=Everything OK, 0 requests attended in the last 60s interval