Hello @lobequadrat,
If you have both your Sync Gateway and Server running locally on your machine with the “grocery-sync” bucket created, then try changing the “kServerDbURL” value in your ‘DemoAppDelegate.m’ file to include the hostname/address and port of the Sync Gateway with the name of the data bucket you are targeting.
eg. #define kServerDbURL @“http://localhost:4984/grocery-sync”