Created question in FIWARE Q/A platform on 08-08-2016 at 12:08
Please, ANSWER this question AT https://stackoverflow.com/questions/38826682/fiware-orion-context-broker-cannot-create-subscription-callback-is-missing

Question:
FIWARE - Orion Context Broker - Cannot create subscription - Callback is missing

Description:
I'm working with the Orion Context Broker and I'm trying to add a new subscription but I'm getting an error that the callback is missing even though I have provided one.

Here are the entities that I have

$ curl localhost:1026/v2/entities -s -S --header 'Accept: application/json' | python -mjson.tool
[
{
"id": "Room1",
"pressure": {
"metadata": {},
"type": "Integer",
"value": 720
},
"temperature": {
"metadata": {},
"type": "Float",
"value": 23
},
"type": "Room"
},
{
"id": "Room2",
"pressure": {
"metadata": {},
"type": "Integer",
"value": 711
},
"temperature": {
"metadata": {},
"type": "Float",
"value": 21
},
"type": "Room"
}
]

And here is the call to create a new subscription and subsequent error:

$ curl -v localhost:1026/v2/subscriptions -s -S --header 'Content-Type: application/json' \
> d @ <<EOF
> {
> "description": "A subscription to get info about Room1",
> "subject": {
> "entities": [
>

> ],
> "condition":

> },
> "notification": {
> "http":

,
> "attrs": [
> "temperature",
> "pressure"
> ]
> },
> "expires": "2040-01-01T14:00:00.00Z",
> "throttling": 5
> }
> EOF

• Hostname was NOT found in DNS cache
• Trying 127.0.0.1...
• Connected to localhost (127.0.0.1) port 1026 (#0)
  > POST /v2/subscriptions HTTP/1.1
  > User-Agent: curl/7.35.0
  > Host: localhost:1026
  > Accept: /
  > Content-Type: application/json
  > Content-Length: 417
  >
• upload completely sent off: 417 out of 417 bytes
  < HTTP/1.1 400 Bad Request
  < Connection: Keep-Alive
  < Content-Length: 58
  < Content-Type: application/json
  < Date: Mon, 08 Aug 2016 10:11:39 GMT
  <
• Connection #0 to host localhost left intact {"error":"BadRequest","description":"callback is missing"}