ContextBroker Vectors UPDATE with unchanged value causes ONCHANGE subscription notification

Question

I have a JSON formatted as this one:

{
"contextElements": [
    {
        "type": "environment",
        "isPattern": "false",
        "id": "labMax",
        "attributes": [
        {
            "name": "users",
            "type": "vector",
            "value": [{"userId":"0001", "status":"0"},{"userId":"0002", "status":"0"}]
        },
        {
            "name": "rooms",
            "type": "vector",
            "value": [{"room1": [ {"id":"room1"}, {"owner":"1"}]},{"id":"room2"}, {"owner":"2"}]
        },
        {
            "name": "sensors",
            "type": "vector",
            "value": [
          {"sensor1": [ {"id":"1"}, {"location":"room1"},{"value":"11"},{"status":"ok"}]},
          {"sensor2": [ {"id":"2"}, {"location":"room1"},{"value":"22"},{"status":"update"}]}
          ]
        }

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

I have also a subscription ONCHANGE on the attribute "sensors" and when I update it, without changing any value inside the vector, it causes a notification. Probably this is a wrong behaviour because a subscriber should be only notified when a value changes. On the other side, if I use strings or integer as attributes values, it works correctly.

Answer 1

Up to Orion 0.16.0 at least, this is a known behaviour. An issue has been openend in the Orion github.com repository about it.

UPDATE: since Orion 3.11.0 (released on January 29th, 2024) this problem is solved.

By the way, you are highly encouraged to use NGSIv2 API. The NGSIv1 shown in the question post is deprecated and could be removed soon.