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

Question

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

Answer 1

Since the question is so self-contained and complete (thank you very much for that, @lukas), let me just remark 2 aspects as a summary and answer:

1. The STH only support NGSI v1 notifications so please subscribe the STH to the Context Broker instance using NGSI v1.
2. The MongoDB database imposes as a restriction that 2 databases cannot have the same name but distinct capitalization (see https://docs.mongodb.com/manual/reference/limits/#naming-restrictions), consequently you cannot use 2 distinct service names which only vary their capitalization with the STH since the database name is generated from the service name. This is, you cannot use myservice and myService as services for whose the STH is going to aggregate data. Include some additional character on any of them and everything should be fine.

Thank you very much! ;)