start method
Starts listening for incoming connections.
Implementation
@mustCallSuper
Future<void> start() async {
await bind();
packets.listen((packet) {
final connection = _findExistingConnection(packet.address) ??
Connection(clientSalt: 0, serverSalt: 0, address: packet.address);
if (_connectionTimers[connection] != null) {
_connectionTimeout(connection);
}
});
}