Difference between "getParameterValues" and "projection" to fetch parameter values?

1

Hello everyone, can someone please explain me the difference between these two different ways to fetch/get parameter values?

1: getParameterValues

query = { “name”: “getParameterValues”, “parameterNames”: [ “InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnectionNumberOfEntries”, “InternetGatewayDevice.Time.NTPServer1”, “InternetGatewayDevice.Time.Status” ] }

curl -i ‘http://localhost:7557/devices/00236a-96318REF-SR360NA0A4%252D0003196/tasks?timeout=3000&connection_request’
-X POST
–data ‘{“name”: “getParameterValues”, “parameterNames”: [“InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnectionNumberOfEntries”, “InternetGatewayDevice.Time.NTPServer1”, “InternetGatewayDevice.Time.Status”] }’

2: Using projection to return specific parameters for a given device:

query = {“_id”: “202BC1-BM632w-000000”}

curl -i ‘http://localhost:7557/devices?query={“_id”%3A"202BC1-BM632w-000000"}&projection=InternetGatewayDevice.DeviceInfo.ModelName,InternetGatewayDevice.DeviceInfo.Manufacturer’

The projection URL param is a comma-separated list of the parameters to receive.

2

The first one tells the ACS to refresh the InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnectionNumberOfEntries, InternetGatewayDevice.Time.NTPServer1 and InternetGatewayDevice.Time.Status parameters from the CPE.

The second is used for querying data from the ACS. Without a projection, the entire data model for the target device will be returned. Most of the time, thats way more than you need. So you can use a projection to limit the data returned to just the parameters you care about.

3

If that’s the case, how is getParameterValues different from using refreshObject?

For example:
curl -i ‘http://localhost:7557/devices/00236a-SR552n-SR552NA084%252D0003269/tasks?timeout=3000&connection_request’
-X POST
–data ‘{“name”: “refreshObject”, “objectName”: “InternetGatewayDevice.WANDevice.1.WANConnectionDevice.1.WANIPConnectionNumberOfEntries”}’

Does refreshObject effectively perform the same action as the parameter refresh you mentioned, or is there a key distinction between them?

4

i’m not 100% honestly. I never use refreshObject, only GPN/GPV/SPV.

5

And what does “getParameterNames” do? As there is nothing mentioned in the docs.

6

Try google. The information is out there.