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Add SD query and response to mDNS

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Sergio R. Caprile committed 2026-07-22 16:58:13 -03:00
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commit 66eac28c20
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tutorials/udp/mdns-sd-client/README.md
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Browses for `_http._tcp.local` services on the local network using mDNS/DNS-SD.
```sh
make
cc main.c mongoose.c -W -Wall -Wextra -g -I. -DMG_ENABLE_LINES -o example
./example
1304aa594 3 net.c:311:mg_mgr_init MG_IO_SIZE: 16384, TLS: none
1304aa594 3 net.c:224:mg_listen 1 4 udp://224.0.0.251:5353
1304aa594 3 sock.c:167:mg_send 1 4 0:0:0 34 err 0
1304aa594 3 sock.c:361:read_conn 1 4 0:0:0 34 err 0
1304aa594 3 dns.c:478:handle_mdns_query PTR request for _http._tcp
1304aa5d0 3 sock.c:361:read_conn 1 4 0:0:0 289 err 0
1304aa5d1 3 dns.c:703:handle_mdns_respo PTR response for _http._tcp.local from 3D03F3CPAU00096.local
1304aa5d1 2 main.c:15:mdns_ev_handler Got a response
SERVICE -> _http._tcp
NAME -> 3D03F3CPAU00096.local
PORT -> 80
TXT -> host=3D03F3CPAU00096mac=e0:50:8b:8d:2f:75ip=192.168.69.220
URL -> http://3D03F3CPAU00096.local:80
1304aa622 3 sock.c:361:read_conn 1 4 0:0:0 226 err 0
1304aa622 3 dns.c:703:handle_mdns_respo PTR response for _http._tcp.local from DIP-3TIR3020140717CCWR473261824.local
1304aa622 2 main.c:15:mdns_ev_handler Got a response
SERVICE -> _http._tcp
NAME -> DIP-3TIR3020140717CCWR473261824.local
PORT -> 80
ADDRESS -> 192.168.69.225
TXT -> path=/
URL -> http://192.168.69.225:80
1304aa6f5 3 sock.c:361:read_conn 1 4 0:0:0 169 err 0
1304aa6f5 3 dns.c:703:handle_mdns_respo PTR response for _http._tcp.local from PHILIPS_HD9255_3_6B7E5E.local
1304aa6f5 2 main.c:15:mdns_ev_handler Got a response
SERVICE -> _http._tcp
NAME -> PHILIPS_HD9255_3_6B7E5E.local
PORT -> 80
ADDRESS -> 192.168.69.167
TXT -> Device Type=Domestic Appliance
URL -> http://192.168.69.167:80
```