I started following the instructions for SmartThings with MQTT and Home Assistant provided here
and got hung up once I tried to configure the ST smartapp. When I tried to save the settings the smartapp hung and eventually returned a vague error (“There was a problem saving…”). I tried to remove the app but it will not uninstall nor delete. I tried to remove the ST device I created as described in the instructions but once again, it wont let me. I cannot make any changes in either the device or smart app without getting an error. Neither the device or app can be deleted via mobile or ST IDE.
How do I get back to normal so I can start over??