[Twisted-Python] PB and unstable network

[Viktor Klimov]

I use PB in unstable network. The server remembers the last answer.
Client detection disconnected, connected again, makes entry into the
system and calls the function returns the last response
(get_last_response). The answer, it returns a deferred saved earlier.
If somewhere an error cycle repeats.

All of this works until the lost communication does not happen at a
time when Twisted sends data to a server. As the server in this
situation does not receive a first request, and when you call
get_last_response client receives the data that has already received.

How can I check if an error in the client arrived data to the server or not?