paralel batches error handling

Hi all,
I need to find out how can I handle lost calls to server, because of disconnect. I need to be able to get from warninghandler information about which batch was not delivered to the server. Let's describe situation:

I have chess server, so everything needs to be consistent and i can't lost move from client. Client has to detect lost message and reconnect and send it again.   I can handle reconnect, I can handle resend but i dont know how to find out which message(batch) was not delivered so i dont know which message should be resend after reconnect. I cann't send message twice and i cann't lost messages.... i can wait for reconnect.. but only acceptable number of correctly delivered messages to the server is 1.  So does someone know how can i gain batchId, or batch from warning/error message to identify not delivered calls?

Thanks a lot.

Libor