Created question in FIWARE Q/A platform on 25-05-2016 at 14:05
Please, ANSWER this question AT https://stackoverflow.com/questions/37437225/fiware-orion-context-broker-subscriptions-condition-does-not-work

Question:
Fiware Orion context broker subscriptions condition does not work

Description:
I am using Orion Context Broker version 1.1.0

I had the only entity in my DB:

{
"id"=>"Room1",
"type"=>"Room",
"temperature"=>{"type"=>"none", "value"=>10, "metadata"=>{}}
}

I did not have any subscription.

Then I created 3 subscriptions:

[
{
"subject"=>{"entities"=>[

{"id"=>"Room1", "idPattern"=>"", "type"=>""}],
"condition"=>{"attrs"=>["temperature"], "expression"=>{"q"=>"temperature>10"}}}
},
{
"subject"=>{"entities"=>[{"id"=>"Room1", "idPattern"=>"", "type"=>""}

],
"condition"=>{"attrs"=>["temperature"], "expression"=>

{"q"=>"temperature<10"}

}}
},
{
"subject"=>{"entities"=>[

{"id"=>"Room1", "idPattern"=>"", "type"=>""}],
"condition"=>{"attrs"=>["temperature"], "expression"=>{"q"=>"temperature==10"}}}
}
]


As you can see, the difference is only in the expressions: temperature>10, temperature<10, temperature==10.

So that any time I change the Room1 temperature I should have only one subscription triggering the notification.

But it does not work as it should !!!

Each time I change the temperature, I have all 3 notifications.

However, when subscriptions were created, only one of them triggered a notification, depending on the temperature value of the Room1. It worked as expected.

But when Room1 temperature is changed, it does not work correctly and triggers all 3 notifications.

Edit:
Full output of the GET /v2/subscriptions operation:

[
{
"id"=>"574716a22fe8cdc00a696a94",
"expires"=>"2017-04-05T14:00:00.00Z",
"status"=>"active",
"subject"=>{
"entities"=>[{"id"=>"Room1", "idPattern"=>"", "type"=>""}

],
"condition"=>{"attrs"=>["temperature"],
"expression"=>{"q"=>"temperature>10"}}
},
"notification"=>{"attrs"=>["temperature"], "http"=>{"url"=>"http://localhost:1028/accumulate"}},
"throttling"=>5
},
{
"id"=>"574716a22fe8cdc00a696a95",
"expires"=>"2017-04-05T14:00:00.00Z",
"status"=>"active",
"subject"=>{
"entities"=>[

{"id"=>"Room1", "idPattern"=>"", "type"=>""}],
"condition"=>{"attrs"=>["temperature"],
"expression"=>{"q"=>"temperature<10"}}
},
"notification"=>{"attrs"=>["temperature"], "http"=>{"url"=>"http://localhost:1028/accumulate"}},
"throttling"=>5},
{
"id"=>"574716a22fe8cdc00a696a96",
"expires"=>"2017-04-05T14:00:00.00Z",
"status"=>"active",
"subject"=>{
"entities"=>[{"id"=>"Room1", "idPattern"=>"", "type"=>""}

],
"condition"=>{"attrs"=>["temperature"],
"expression"=>{"q"=>"temperature==10"}}
},
"notification"=>{"timesSent"=>2, "lastNotification"=>"2016-05-26T15:30:42.00Z", "attrs"=>["temperature"], "http"=>{"url"=>"http://localhost:1028/accumulate"}},
"throttling"=>5
}
]

Edit2: Add some scenario:

Changed Room1 temperature to 11
Had the same output, but
[...

{"timesSent"=>1}..., ...{"timesSent"=>1}

..., ...

{"timesSent"=>3}...]
Changed Room1 temperature to 10
Had the same output, but
[...{"timesSent"=>2}..., ...{"timesSent"=>2}..., ...{"timesSent"=>4}...]
Changed Room1 temperature to 9
Had the same output, but
[...{"timesSent"=>3}

..., ...

{"timesSent"=>3}

..., ...

{"timesSent"=>5}

...]