Flutter & Protobuf

This is the code shown during my Flutter Montreal presentation on May 22, 2024. https://www.youtube.com/live/6VpGWm6nIhY?si=hcqPY-aKPWLXVwzP&t=5790

How to use / demo

1. The app will build as is with the local DroneStatus Dart class.
2. Delete drone_status_class.dart, cd lib and run protoc --dart_out . drone_status.proto.
3. Delete the imports for drone_status_class.dart, and import drone_status.pb.dart.
4. App will run / build using the protobuf generated classes.
5. Run protoc --python_out . --pyi_out . drone_status.proto to create the python classes needed for drone_status.proto to run.
6. Create an AWS Lambda function, enabling the function URL under "Configuration".
7. Copy the drone_status_pb2.py file into the lambda function, and populate lambda_function.py with the contents of drone_status.py.
8. Delete _updateDroneStatus() and uncomment fetchDroneStatus()
9. Replace <LAMBDA_URL> in the code with the function URL of the deployed lambda
10. Watch the app work as it now fetches the values from the remote Lambda URL
11. Try performing the changes in the comments of drone_status.proto, re-running protoc and try integrating them in one, the other, and both environments (Dart / Python). See how it works!