In the Flutter SDK, the correct methods for sending files and streaming bytes are provided by the

LocalParticipant

class: Sending Files Use the

sendFile

method:

If you’d like more details or examples, just let me know what part you’re curious about: • Need a hand setting up the

SendFileOptions

or

StreamBytesOptions

? • Wondering how to handle the files or streams once they’re received? • Looking for extra examples or some troubleshooting tips for these methods? Feel free to tell me more about what you’re working on, and I’ll be happy to help out!

Hey there! To help you debug the file sending and receiving issue between your Flutter SDK and Python backend, here’s a simple step-by-step guide: 1. Double-check File Sending in Flutter • Make sure you’re using the

sendFile

method like this in Flutter:

var info = await room.localParticipant.sendFile(
    File('path_to_your_file'),
    options: SendFileOptions(
        topic: 'files',
        onProgress: (progress) {
            print('Progress: $progress');
        },
    ),
);

2. Verify the Python Backend Handler • Confirm your Python backend has a handler set up for the "files" topic:

async def on_file_received(reader, participant_identity):
    <http://logger.info|logger.info>("Received file from %s: '%s'", participant_identity, reader.info.name)
    with open(reader.info.name, mode="wb") as f:
        async for chunk in reader:
            f.write(chunk)

• Don’t forget to register the handler before connecting to the room:

room.set_byte_stream_handler("files", on_file_received)

3. A Few Friendly Debugging Tips • Make sure the

topic

matches exactly on both the sender and receiver sides. • Check that MIME types are detected correctly and your file permissions allow reading and writing. • Handle all chunks properly on the receiver side and close streams when done. If you hit any snags or want me to walk you through more detailed debugging, just let me know—I’m here to help!