Created question in FIWARE Q/A platform on 14-04-2016 at 15:04
Please, ANSWER this question AT http://stackoverflow.com/questions/36624433/subscriptions-dont-seem-to-work-using-dockerized-fiware-orion

Question:
Subscriptions don't seem to work using dockerized fiware-orion

Description:
I'm using Fiware-Orion ContextBroker 0.28, the dockerized version in my localhost on ubuntu 15.10 64 bits.

$ curl localhost:1026/version
{
"orion" : {
"version" : "0.28.0-next",
"uptime" : "0 d, 0 h, 0 m, 6 s",
"git_hash" : "067e13618c247daa4af61f82d7831f3015d9eb5d",
"compile_time" : "Mon Mar 14 13:04:02 UTC 2016",
"compiled_by" : "root",
"compiled_in" : "838a42ae8431"
}
}

The docker configuration I'm using is:

$ cat docker-compose.yml
mongo:
image: mongo:2.6
command: --smallfiles --nojournal
orion:
image: fiware/orion
links:

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

The warning I get from orion/docker when I do the subscriptions is:

orion_1 | WARNING@12:19:14 AlarmManager.cpp[303]: Raising alarm NotificationError localhost:1028/accumulate: (curl_easy_perform failed: Couldn't connect to server)

I'm following the API V1 walkthorugh to test subscriptions to changes. I start with a mint new dockerized (sudo docker-compose up and all that fuzz) fiware-orion 0.28 with mongodb. Then I start the accumulator

$ ./accumulator-server.py 1028 /accumulate localhost on
verbose mode is on

• Running on http://localhost:1028/ (Press CTRL+C to quit)

Then I register Room1

$ (curl localhost:1026/v1/updateContext -s -S --header 'Content-Type: application/json' \
> -header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
> {
> "contextElements": [
> {
> "type": "Room",
> "isPattern": "false",
> "id": "Room1",
> "attributes": [
>

{ > "name": "temperature", > "type": "float", > "value": "23" > }

,
>

{ > "name": "pressure", > "type": "integer", > "value": "720" > }

> ]
> }
> ],
> "updateAction": "APPEND"
> }
> EOF
{
"contextResponses": [
{
"contextElement": {
"attributes": [

{ "name": "temperature", "type": "float", "value": "" }

,

{ "name": "pressure", "type": "integer", "value": "" }

],
"id": "Room1",
"isPattern": "false",
"type": "Room"
},
"statusCode":

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

}
]
}

Then I test query context just to check:

$ (curl localhost:1026/v1/queryContext -s -S --header 'Content-Type: application/json' \
> -header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
> {
> "entities": [
>

{ > "type": "Room", > "isPattern": "false", > "id": "Room1" > }

> ]
> }
> EOF
{
"contextResponses": [
{
"contextElement": {
"attributes": [

{ "name": "pressure", "type": "integer", "value": "720" }

,

{ "name": "temperature", "type": "float", "value": "23" }

],
"id": "Room1",
"isPattern": "false",
"type": "Room"
},
"statusCode":

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

}
]
}

Then I do the subscription

$ (curl localhost:1026/v1/subscribeContext -s -S --header 'Content-Type: application/json' \
> -header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
> {
> "entities": [
>

{ > "type": "Room", > "isPattern": "false", > "id": "Room1" > }

> ],
> "attributes": [
> "pressure"
> ],
> "reference": "http://localhost:1028/accumulate",
> "duration": "P1M",
> "notifyConditions": [
>

{ > "type": "ONCHANGE", > "condValues": [ > "pressure" > ] > }

> ],
> "throttling": "PT5S"
> }
> EOF
{
"subscribeResponse":

{ "duration": "P1M", "subscriptionId": "570f8ac247fcf8a62722353c", "throttling": "PT5S" }

}

At this point the manual says that the accumulator might receive a first update but it's not required, so I don't receive nothing but maybe that's OK. Or maybe not, because after sending the subscription query, orion's docker says:

orion_1 | WARNING@12:19:14 AlarmManager.cpp[303]: Raising alarm NotificationError localhost:1028/accumulate: (curl_easy_perform failed: Couldn't connect to server)

Finally I update the entity and I should receive the update on the accumulator, but I don't:

$ (curl localhost:1026/v1/updateContext -s -S --header 'Content-Type: application/json' \
> -header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
> {
> "contextElements": [
> {
> "type": "Room",
> "isPattern": "false",
> "id": "Room1",
> "attributes": [
>

{ > "name": "temperature", > "type": "float", > "value": "56.5" > }

,
>

{ > "name": "pressure", > "type": "integer", > "value": "553" > }

> ]
> }
> ],
> "updateAction": "UPDATE"
> }
> EOF
{
"contextResponses": [
{
"contextElement": {
"attributes": [

{ "name": "temperature", "type": "float", "value": "" }

,

{ "name": "pressure", "type": "integer", "value": "" }

],
"id": "Room1",
"isPattern": "false",
"type": "Room"
},
"statusCode":

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

}
]
}

I should also say that it's quite difficult to get fiware-orion to compile on Ubuntu, and that's the reason why I'm using docker.