No it’s not a parameter nor a configuration. It must be set via RPC or in the GUI. For example you can run this while the daemon is running:
/path/to/nud setdatafeed https://abc.com/my-datafeed.json
If the data feed is signed you can use this:
/path/to/nud setdatafeed https://abc.com/my-datafeed.json https://abc.com/my-datafeed.json.signature SSPwKhtFEyQvUx9cPjaC8yUxdeNrTMfJfF
And if you want to only update the park rates and the custodian votes:
/path/to/nud setdatafeed https://abc.com/my-datafeed.json https://abc.com/my-datafeed.json.signature SSPwKhtFEyQvUx9cPjaC8yUxdeNrTMfJfF custodians,parkrates
Or (without signature):
/path/to/nud setdatafeed https://abc.com/my-datafeed.json "" "" custodians,parkrates
The data feed informations are stored in your NuShares wallet.
To verify your current settings:
/path/to/nud getdatafeed
