How to improve file transfer speed in Flutter WebRTC?

[azharrashe3d]

I'm developing a Flutter application using the flutter_webrtc plugin to establish a WebRTC connection between two devices. I've successfully configured a STUN server for NAT traversal and a signaling server to exchange connection details. The connection itself works fine, and I can send and receive audio and video streams without issues.

However, I'm facing a problem with file transfer speeds. When I try to send a file (e.g., an image or a document) over the WebRTC data channel, the transfer speed is extremely slow. I've tried sending files of different sizes, but the speed remains consistently poor.

Here's a summary of my setup:

• Flutter: Using the flutter_webrtc plugin.
• Signaling Server: We have develop our own stun server.
• STUN Server: Have tried both google stun, and our own as well.
• File Transfer: Using the RTCDataChannel to send the file in chunks.

I've already tried the following:

• Adjusting the maxRetransmits and ordered parameters of the RTCDataChannel.
• Experimenting with different chunk sizes for file transfer.
• Verifying network connectivity on both devices.

None of these attempts have significantly improved the file transfer speed. Could anyone provide insights or suggestions on how to speed up file transfer in Flutter WebRTC? Are there any specific configurations, optimizations, or alternative approaches I should consider? Any help would be greatly appreciated!