Is wireshark working on supporting 802.3BT LLDP extensions (29 byte extended TLVs for Power-via-MDI)

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'Wireshark' is not working on anything, it's all contributor based. So that means that if someone is interested in coding support for a certain feature (s)he is welcome to push the changes. If you're not a programmer, but would like to see something added/changed you can always file an enhancement bug stating your request and provide a sample capture file for your improvement to be tested with. This greatly improves your chances someone else investing their free time to create the enhancement, which will end up in the next stable release branch.