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My question is that when a socket at the receiver-side sends an ack? At the time the application read the socket data or when the underlying layers get the data and put it in the buffer?
I want this because I want both side applications know whether the other side took the packet or not.
TCP ACKs are meant to acknowledge the TCP packets on the transmission layer not the application layer. Only your application can signal explicitly that it also has processed the data from the buffers.