Discovery — mDNS + LLMNR

PrintDrop advertises on all active interfaces so http://printdrop.local works out of the box and http://printdrop works on Windows without Bonjour.

What runs

mDNS (src/printdrop/net.cpp:67): MDNS.begin(host) + _http._tcp on port 80. Answers hostname.local. Enabled via PRINTDROP_ENABLE_MDNS (config.h:123).
LLMNR (net.cpp:74): minimal UDP 5355 responder ( unicast, 224.0.0.252). Answers single-label hostname and hostname.local A queries. Enabled via PRINTDROP_ENABLE_LLMNR. Windows LLMNR and Linux systemd-resolved both resolve the bare name.
Static IP / DNS rewrite (README.md:Finding it on the network) remains an option for fixed addresses.

Both use the same hostname from NVS (DEFAULT_HOSTNAME "printdrop" config.h:78), settable via Settings → Hostname, serial hostname <name>, or platformio.ini build flags. /api/status reports discovery {mdns, llmnr} and hostname.

Verifying

# mDNS
avahi-resolve -n printdrop.local   # Linux
dns-sd -G v4 printdrop.local       # macOS
ping printdrop.local

# LLMNR (Windows, or `systemd-resolved` Linux)
ping printdrop
nslookup printdrop

If both fail, use the IP from serial status or http://192.168.4.1 in AP mode.