let mut cd = Cyberdeck::new(|c, msg| {
    if let Some(m) = msg {
        println!("Recieved a message from channel {}!", c.name());
        let msg_str = String::from_utf8(m.data.to_vec()).unwrap();
        println!("Message from DataChannel '{}': {}", c.name(), msg_str);
    } else if c.state() == RTCDataChannelState::Open {
        println!("DataChannel '{}' opened", c.name());
        c.send_text("Connected to client!").unwrap();
    } else if c.state() == RTCDataChannelState::Closed {
        println!("DataChannel '{}' closed", c.name());
    }
})
.await?;
let answer = cd.set_offer(offer).await?;