Designing Flash Connect Device Communication

Zero-Configuration Discovery

Typical local network sync requires annoying pairing codes or cloud routing relays. We wanted a seamless, secure, zero-config peer-to-peer system.

Local P2P Matrix

We combined multicast DNS (mDNS) device-to-device local detection with secure WebRTC data channels to achieve transfer speeds of up to 42 MB/sec over regular Wi-Fi without leaving the local router framework.

pub fn broadcast_device_presence(device: &Device) -> Result<(), NetworkError> {
    let socket = UdpSocket::bind("0.0.0.0:5353")?;
    socket.set_multicast_loop_v4(false)?;
    socket.send_to(&device.serialize(), "224.0.0.251:5353")?;
    Ok(())
}