Function start 

pub fn start(
    config: AutoConfig,
    tx: EventSender,
    next_dynamic_id: Arc<AtomicU64>,
) -> Result<()>

Start an AutoInterface. Discovers local IPv6 link-local interfaces, sets up multicast discovery, and creates UDP data servers.

Returns a vec of (InterfaceId, Writer) for each initial peer (typically empty since peers are discovered dynamically via InterfaceUp events).