Afaik it doesn't. The only useful thing there is, is a deadline on each packet so the retransmission would have to be fast, but it seems doable.

https://github.com/beac0n/ruroco/blob/ce766751b51c8ff6246a2b...

The encrypted information is current time, command and random data. So the server could feasibly detect that a retransmission has occurred but that's about it.