Don’t start ratel with this addr command (don’t even need it). And that’s not the point. What only matters is the address in the UI. Not in the command that starts the UI.
You have it pointed to 192.168.1.97:8000 which is the same address of Ratel UI. Instead, you should use 192.168.1.97:8080 which is the Dgraph HTTP API. Just switch this and you good to go.