Not possible on smarters, as the app isn't set up that way...
What you could do though, is hard program it to have the url for the pn server in it and hide the file option and the url location so it just has the get file option. Then hard program the user and pass in to it and remove the options to ask for user and pass...
Only trouble is, if you need to change the values, you'd need to change the app. Good thing with v3 though, is that it does have an option to update the app within the app. So you could just create a higher version within the app. But I don't think it auto checks for updates, so relies on users to check for update...