What is a TCP window update?

Question

I\'m making my own custom server software for a game in Java (the game and original server software were written with Java). There isn\'t any protocol documentation available, s

Answer 1

TCP WindowUpdate - This indicates that the segment was a pure WindowUpdate segment. A WindowUpdate occurs when the application on the receiving side has consumed already received data from the RX buffer causing the TCP layer to send a WindowUpdate to the other side to indicate that there is now more space available in the buffer. Typically seen after a TCP ZeroWindow condition has occurred. Once the application on the receiver retrieves data from the TCP buffer, thereby freeing up space, the receiver should notify the sender that the TCP ZeroWindow condition no longer exists by sending a TCP WindowUpdate that advertises the current window size.

https://wiki.wireshark.org/TCP_Analyze_Sequence_Numbers