Packet loggers operate by "hooking" into the game’s network socket. In NosTale, the communication is typically based on the TCP/IP protocol.
: Captures both incoming ( Recv ) and outgoing ( Send ) packets as you play. nostale packet logger
If you are looking for a reliable starting point, several developers have shared their work on GitHub. These are often used for educational purposes or developing "quality of life" mods: Packet loggers operate by "hooking" into the game’s