This post replies very well to the question "How to get Advertising ID in android?"...
but not how to use it.
I would like to know what is the parameter to be used in the Google Measurement Protocol to transfer that advertising ID the Google endpoint and get demographic insights in my GA dashboards (on https://analytics.google.com/).
Do I have to send it with the client id ("cid")?
Or, to make it simple, what is the parameter used by the SDK on iOS and Android?