I think what you describe (and need) is a simple NetBIOS name server (NBNS for short). It listens on a UDP port 137 for UDP broadcast queries for its name, and responds to matches. You could also configure the DHCP server to assign a DNS provided IP address, so people would find your device based on a proper name resolution. Although that requires you to be friends with the IT guy. Using NBNS will work only in windoze environments, and I personally don't know if that port is still operational in newer systems. Anyway, the name server itself is pretty simple, I wrote a quick hack for it several years ago; it is for another system but I can help you move it to lwIP RAW API.
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