Created question in FIWARE Q/A platform on 21-02-2022 at 10:02
Please, ANSWER this question AT https://stackoverflow.com/questions/71204976/fiware-draco-subscription-works-only-for-the-first-payload-only-the-first-pay

Question:
Fiware Draco - Subscription works only for the first payload. Only the first payload is saved in historical mongodb

Description:
I am trying to save historical context data in Mongo, but without success. Only the first payload sent to Draco is saved to MongoDB for historical data, but Mongo does not react to attribute updates.
Versions used for the test: Orion-LD version 0.8.0, Mongo version 4.4, Draco version 1.3.6.
I tested it also with the 3.4 version of Mongo and the behavior is the same.
Can you, please, help me to fix a problem?
Below are the steps I performed:
Create a Draco subscription:
curl --location --request POST 'http://localhost:1026/v2/subscriptions' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw '{
"description": "Notify Draco of all context changes",
"subject": {
"entities": [

]
},
"notification": {
"http":

},
"throttling": 0
}'

Create an entity:
curl --location --request POST 'http://localhost:1026/v2/entities' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw ' {
"id":"urn:ngsi-ld:Product:0102", "type":"Product",
"name":

,
"size":

,
"price":

}'

Overwrite the value of an attribute value:
curl --location --request PUT 'http://localhost:1026/v2/entities/urn:ngsi-ld:Product:0102/attrs' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw '{
"price":

}'

LISTEN_HTTP PROCESSOR:
LISTEN_HTTP
NGSITOMONGO PROCESSOR:NGSITOMONGO
Template: Template
MongoDB: mongo