Create entity in a service using IDAS and ContextBroker - fiware

Question

So I'm having some problems connection virtual devices to the contextBroker and i thing it's because of the Fiware-Service. I don't want to use the OpenIoT (even though that didn't worked for me either). I didn't manage to find any documentation about service creation and maybe i'm creating it wrong.
I did Python CreateService bus_auto 4jggokgpepnvsb2uv4s40d59ovand i'm not sure it returns me 201. I updated the config.ini file to work on MY service but when i send the observations it doesn't change the value of the entity on the contextBroker
I'm now running it in
My config.ini file:
[user]
# Please, configure here your username at FIWARE Cloud and a valid Oauth2.0 TOKEN for your user (you can use get_token.py to obtain a valid TOKEN).
username=
token=NULL
[contextbroker]
host=127.0.0.1
port=1026
OAuth=no
# Here you need to specify the ContextBroker database you are querying.
# Leave it blank if you want the general database or the IDAS service if you are looking for IoT devices connected by you.
fiware_service=bus_auto
[idas]
host=130.206.80.40
adminport=5371
ul20port=5371
OAuth=no
# Here you need to configure the IDAS service your devices will be sending data to.
# By default the OpenIoT service is provided.
fiware-service=bus_auto
fiware-service-path=/
apikey=4jggokgpepnvsb2uv4s40d59ov
[local]
#Choose here your System type. Examples: RaspberryPI, MACOSX, Linux, ...
host_type=CentOS
# Here please add a unique identifier for you. Suggestion: the 3 lower hexa bytes of your Ethernet MAC. E.g. 79:ed:af
# Also you may use your e-mail address.
host_id=db:00:ff
I'm using the python script GetEntity.py:
python2.7 GetEntity.py bus_auto_2
I also tried using a python script that i created:
import json
import urllib
import urllib2
BASE_URL = 'http://127.0.0.1:1026'
QUERY_URL = BASE_URL+'/v1/queryContext'
HEADERS = {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
QUERY_EXAMPLE = {
"entities": [
{
"type": "bus_auto_2",
"isPattern": "false",
"id": "Room1"
}
]
}
def post(url, data):
""""""
req = urllib2.Request(url, data, HEADERS)
f = urllib2.urlopen(req)
result = json.loads(f.read())
f.close()
return result
if __name__ == "__main__":
print post(UPDATE_URL, json.dumps(UPDATE_EXAMPLE))
print post(QUERY_URL, json.dumps(QUERY_EXAMPLE))

Answer 1

I see the service is well created and actually I see one device defined within it.
I have even successfully sent an observation (t|23) bus_auto_2 device
Later, I check in the ContextBroker this entity: "thing:bus_auto_2" and I see the latest observation I sent.
Did you update in the config.ini file the FIWARE_SERVICE both at ContextBroker and IDAS sections ?
Cheers,

Answer 2

Looking to your script, it seems you are not including the Fiware-Service header in you queryContext request. Thus, the query is resolved in the "default service" and not in bus_auto service.
Probably changing the HEADERS map in the following way would solve the issue:
HEADERS = {
'Content-Type': 'application/json',
'Accept': 'application/json',
'Fiware-Service: 'bus_auto'
}
EDIT: In addition to the above change, note that the BASE_URL is pointint to a local Orion instance, not the one connected with IDAS (which run in the same machine that IDAS). Thus, I think you also need to modify BASE_URL in the following way:
BASE_URL = 'http://130.206.80.40:1026'