Created question in FIWARE Q/A platform on 17-01-2018 at 18:01
Please, ANSWER this question AT https://stackoverflow.com/questions/48306811/cant-find-device-lazy-attributes-in-orion-context-broker

Question:
Can't find device lazy attributes in Orion Context Broker

Description:
I develop IoT Agent with node.js library. And register device with this through IoTA:

'devices': [{
'device_id': 'ULSensor',
'entity_name': 'Sensor01',
'entity_type': 'BasicULSensor',
'attributes': [

{ 'name': 't', 'type': 'celsius' }

,

{ 'name': 'l', 'type': 'meters' }

],
'lazy': [

{ 'name': 'p', 'type': 'pascal' }

,

{ 'name': 'c', 'type': 'curiosity' }

]
}]

Then make request to http://orion:1026/v1/queryContext with this payload:

data = {
"entities": [

{ "isPattern": "false", "id": 'Sensor01', "type": entity_type }

]
, "attributes": [
'c'
]
}

And got this:

"errorCode" :

{ "code" : "404", "reasonPhrase" : "No context element found", "details" : "error forwarding query" }

But when set 't' in attributes - orion sends correct response. I wrote queryContextHandler and updateContextHandler in IoTA, but they were not called. Orion is a docker image, and node-lib from npm.

IoTA log shows that were two register requests:

"url": "http://orion:1026/NGSI9/registerContext",
"method": "POST",
"json": {
"contextRegistrations": [
{
"entities": [

{ "type": "BasicULSensor", "isPattern": "false", "id": "Sensor01" }

],
"attributes": [

{ "name": "p", "type": "pascal", "isDomain": "false" }

,

{ "name": "c", "type": "curiosity", "isDomain": "false" }

],
"providingApplication": "http://myiotagent:4042"
}
],
"duration": "P1M"
}

"url": "http://orion:1026/v1/updateContext",
"method": "POST",
"json": {
"contextElements": [
{
"type": "BasicULSensor",
"isPattern": "false",
"id": "Sensor01",
"attributes": [

{ "name": "t", "type": "celsius", "value": " " }

,

{ "name": "l", "type": "meters", "value": " " }

]
}
],
"updateAction": "APPEND"
}

How to register device correctly or send query to orion to get lazy attributes?

Thanks!