Fiware orion subscription sending empty body - fiware

Question

My setup:
docker-compose:
version: "3.1"
services:
mongo-db:
image: mongo:3.6
hostname: mongo-db
container_name: db-mongo
expose:
- "27017"
ports:
- "27017:27017"
networks:
- default
command: --bind_ip_all --smallfiles
volumes:
- mongo-db:/data
orion:
image: fiware/orion:2.1.0
hostname: orion
container_name: fiware-orion
depends_on:
- mongo-db
networks:
- default
expose:
- "1026"
ports:
- "1026:1026"
command: -dbhost mongo-db -logLevel DEBUG
logging:
driver: none
healthcheck:
test: curl --fail -s http://localhost:1026/version || exit 1
iot-agent:
image: fiware/iotagent-ul:latest
hostname: iot-agent
container_name: fiware-iot-agent
depends_on:
- mongo-db
networks:
- default
expose:
- "4041"
- "7896"
ports:
- "4041:4041"
- "7896:7896"
logging:
driver: none
environment:
- "IOTA_CB_HOST=orion"
- "IOTA_CB_PORT=1026"
- "IOTA_NORTH_PORT=4041"
- "IOTA_REGISTRY_TYPE=mongodb"
- "IOTA_LOG_LEVEL=DEBUG"
- "IOTA_TIMESTAMP=true"
- "IOTA_MONGO_HOST=mongo-db"
- "IOTA_MONGO_PORT=27017"
- "IOTA_CB_NGSI_VERSION=v2"
- "IOTA_MONGO_DB=iotagentul"
- "IOTA_HTTP_PORT=7896"
- "IOTA_PROVIDER_URL=http://iot-agent:4041"
networks:
default:
ipam:
config:
- subnet: 172.18.1.0/24
volumes:
mongo-db: ~
context:
curl -iX POST \
'http://localhost:1026/v2/op/update' \
-H 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d '{
"actionType":"APPEND",
"entities":[
{
"id":"urn:ngsi-ld:Furniture:unit001", "type":"Furniture",
"name":{
"type":"Text", "value":"Bürostuhl"
},
"price":{
"type":"Integer", "value":404.40
}
},
{
"id":"urn:ngsi-ld:Furniture:unit002", "type":"Furniture",
"name":{
"type":"Text", "value":"Bürotisch"
},
"price":{
"type":"Integer", "value":203.40
}
},
{
"id":"urn:ngsi-ld:DeliverService:unit001", "type":"ServiceProvider",
"name":{
"type":"Text", "value":"trinkajo"
},
"address":{
"type":"PostalAddress",
"value":{
"telephoneNumber":"43q4q53",
"internetAdresse":"https://www.345345.de/"
}
}
},
{
"id":"urn:ngsi-ld:BottleCounter:001", "type":"BottleCounter",
"name":{
"type":"Text", "value":"Wasserflaschenzähler"
},
"numberOfBottles": {"type":"Integer", "value":645}
}
]
}'
curl -iX POST \
'http://localhost:1026/v2/op/update' \
-H 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d '{
"actionType":"APPEND",
"entities":[
{
"id":"urn:ngsi-ld:Furniture:unit001", "type":"Furniture",
"refOffice": {
"type": "Relationship",
"value": "urn:ngsi-ld:Office:001"
}
},
{
"id":"urn:ngsi-ld:Furniture:unit002", "type":"Furniture",
"refOffice": {
"type": "Relationship",
"value": "urn:ngsi-ld:Office:001"
}
},
{
"id":"urn:ngsi-ld:DeliverService:unit001", "type":"ServiceProvider",
"refOffice": {
"type": "Relationship",
"value": "urn:ngsi-ld:Office:001"
}
}
]
}'
curl -iX POST \
'http://localhost:1026/v2/op/update' \
-H 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d '{
"actionType":"APPEND",
"entities":[
{
"id":"urn:ngsi-ld:Office:001", "type" : "Office",
"name":{
"type":"Text",
"value":"didi-Hamburg"
},
"sizeInM2":{
"type":"Integer",
"value":60
},
"address":{
"type":"PostalAddress",
"value":{
"country":"Germany",
"locality":"sdfg",
"street":"sdfg",
"houseNumber" : "34",
"postalCode":"34533"
}
}
}
]
}'
curl -iX POST \
'http://localhost:4041/iot/services' \
-H 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d '{
"services": [
{
"apikey": "4jggokgpepnvsb2uv4s40d59ov",
"cbroker": "http://orion:1026",
"entity_type": "Thing",
"resource": "/iot/d"
}
]
}'
curl -G -X GET \
'http://localhost:1026/v2/entities/urn:ngsi-ld:Office:001' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d 'type=Office' \
-d 'options=keyValues' | json_pp
curl -iX POST \
'http://localhost:4041/iot/devices' \
-H 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-d '{
"devices": [
{
"device_id": "bottleCounter001",
"entity_name": "urn:ngsi-ld:BottleCounter:001",
"entity_type": "BottleCounter",
"timezone": "Europe/Berlin",
"attributes": [
{ "object_id": "c", "name": "numberOfBottles", "type": "Integer" }
],
"static_attributes": [
{ "name":"refOffice", "type": "Relationship", "value": "urn:ngsi-ld:Office:001"}
]
}
]
}'
The subscription:
curl -iX POST \
--url 'http://localhost:1026/v2/subscriptions' \
--header 'Content-Type: application/json' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
--data '{
"description": "Notify me of low stock in Office 001",
"subject": {
"entities": [{"idPattern": ".*", "type" : "BottleCounter"}],
"condition": {
"attrs": ["numberOfBottles"],
"expression": {"q": "numberOfBottles<10;refOffice==urn:ngsi-ld:Office:001"}
}
},
"notification": {
"http": {
"url": "http://delivery:8080/subscription/office"
}
}
}'
How I successfully update the value numberOfBottles:
curl -iX POST \
'http://localhost:7896/iot/d?k=4jggokgpepnvsb2uv4s40d59ov&i=bottleCounter001' \
-H 'fiware-service: didi' \
-H 'fiware-servicepath: /' \
-H 'Content-Type: text/plain' \
-d 'c|2'
My usecase is something like:
There is an office with water bottles for the employee. There is a
'sensor' which can count the water bottles. When an employee is taking
a water bottle the sensor will update the value in fiware. When the
number is below 3 fiware should notify the subscriber. The subscriber
can now order new water bottles.
I have several problems:
With the condition numberOfBottles<10 the subscription never get triggered. When I use something like numberOfBottles!=10 it is working
There is only an empty body sent to the url http://delivery:8080/subscription/office
A bonus question: if I can fix the first issues:
Is there a way to send the attribute address from urn:ngsi-ld:DeliverService:unit001 to the url http://delivery:8080/subscription/office when the subscription get triggered?

Answer 1

As far as I remember, IOTAs are configured by default to use NGSIv1 to send updates to CB. One of the limitations of the NGSIv1 API (deprecated :) is that numbers are parsed always as strings. Thus it makes sense the numberOfBottles<10 filter doesn't work.
In order to overcome this problem IOTA should be configured to use NGSIv2. Add the following to the envrironment of the iot-agent in your docker-compose.yml and redeploy:
- IOTA_CB_NGSI_VERSION=v2
With regards to bonus question, I think #JasonFox has already answered it in the question comments.
EDIT: I have realized you are using UL agent. Different from JSON agent (which allows you to specify JSON supported values, such as numbers, in the request sent to the agent) UL encoding is based on text. Thus, in order to progress numeric values to CB you need (in addition to the IOTA_CB_NGSI_VERSION setting described above):
Set the IOTA_AUTOCAST configuration to true:
- IOTA_AUTOCAST=true
Use "Number" as attribute type at provisioning time (instead of "Integer").
This is described in more detail in this section of the documentation.