You need to add https://arduinojson.org/v5/api/jsonobject/ library to this project to make it compile.
You should use : Tools > Manage Libraries > Search for 'ArduinoJson' > Select a version > Version 5.13.3 > Install
You need to add https://arduinojson.org/v5/api/jsonobject/ library to this project to make it compile.
You should use : Tools > Manage Libraries > Search for 'ArduinoJson' > Select a version > Version 5.13.3 > Install