when i connect the access point data source in my light switch. HTML application has one exception listdata.svc
is not a valid SharePoint 2010 (or later) site with WCF Data Services installed.
I think this is an authentication error to connect to the service. actual service path:
http://[YourSharePointSite]/_vti_bin/ListData.svc/
make sure you have access to this path and you have enabled external access to it