Created question in FIWARE Q/A platform on 28-06-2016 at 14:06
Please, ANSWER this question AT https://stackoverflow.com/questions/38076588/why-this-orion-subscription-dont-works-as-i-want

Question:
Why this orion subscription don't works as I want?

Description:
I have the following subscription in orion 1.2.1:

curl --include \
--header 'Content-Type: application/json' \
--request POST \
--data-binary '{
"description": "subscription",
"subject": {
"entities": [

],
"condition": {
"attrs": [
"IdEvent",
"mFlag"
],
"expression":

}
},
"notification": {
"attrsFormat":"legacy",
"http":

,
"attrs": [
"IdEvent"
]
}
}' \
'http://localhost:1026/v2/subscriptions'

When I send an entity update like this one:

curl --include \
--request PATCH \
--header "Content-Type: application/json" \
--data-binary '{
"mFlag":

}' \
'http://localhost:1026/v2/entities/event-2/attrs'

Orion is not notifiying and it is making me crazy don't know what is wrong. Any idea?

When I remove this part of the subscription:

"expression": {
"q": "mFlag>0"
}

it works but I need it to notify when any attribute is changed and the condition is satisfied.