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TCP ACK Protocol display

Hello all,

I've successfully managed to write a Lua dissector for my protocol built on top of TCP.
The dissector is working well, I can display the fields of my custom protocol when using Wireshark or TShark.
There's just one thing bothering me, I'd like to flag the ACK TCP packets as 'MY_TCP_PROTOCOL' also.
For the moment, the TCP packets without data are not flagged as 'MY_TCP_PROTOCOL' but only 'TCP', even though the dissector is added to the dissector table for tcp.port 12345.

What am I missing ?

Thank you for your replies, Igor