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Like @LimeGlass said, it should be possible, however it will probably be quite complex and require at least a few different packets. I don't have enough time right now to figure it out, and it may take a while, but I suggest that you keep looking around for how to do it. If you already know how to use packets, then I recommend you look here: https://github.com/aadnk/PacketWrap...r/src/main/java/com/comphenix/packetwrapperif you have enough understanding of Java syntax to read it, as it gives information about what each field of a packet means (though it was made for 1.7, and some code may be outdated), and the site wiki.vg also has all packets, but many are named differently and fields may be differenet from ProtocolLib. Googling will also help (though I couldn't find much in my searches) and you may also want to try listening for packet events when a player uses an actual fishing rod.
I just realized I originally wrote the tutorial in Notes and I don't have to wait for the old forums archive to get it, so it should be up soon (after I make some changes).
