tmedicci opened a new pull request, #3543:
URL: https://github.com/apache/nuttx-apps/pull/3543
## Summary
Start the mDNS daemon based on the event of getting a new IP address for any
of the system's network interfaces. This allows DHCP client to trigger the mDNS
daemon after getting a new IP address, for instance.
## Impact
Impact on user: Yes. Allow starting the mDNS daemon when a valid IP is
available.
Impact on build: No.
Impact on hardware: No.
Impact on documentation: No.
Impact on security: No.
Impact on compatibility: No.
## Testing
Taking `esp32p4-function-ev-board:ethernet` as an example:
### Building
```
make distclean && ./tools/configure.sh -S esp32p4-function-ev-board:ethernet
&& kconfig-tweak --enable CONFIG_LIB_MDNS && kconfig-tweak --enable
CONFIG_NETUTILS_MDNS && kconfig-tweak --enable CONFIG_NETUTILS_MDNS_DAEMON &&
kconfig-tweak --enable CONFIG_EXAMPLES_MDNSD && kconfig-tweak --enable
CONFIG_NET_NETLINK && kconfig-tweak --enable CONFIG_NETLINK_ROUTE &&
kconfig-tweak --enable CONFIG_NET_IGMP && kconfig-tweak --enable
CONFIG_LIBC_EXECFUNCS && kconfig-tweak --enable CONFIG_SYSTEM_HOSTNAME &&
kconfig-tweak --set-val CONFIG_NETUTILS_MDNS_STACKSIZE 4096 && kconfig-tweak
--set-str CONFIG_EXAMPLES_MDNS_SERVICE "_http._tcp.local." && kconfig-tweak
--set-str CONFIG_EXAMPLES_MDNS_SERVICE_PORT "80" && make olddefconfig -s -j &&
make -j
```
### Running
Flash the device with `esptool`:
```
esptool.py -p /dev/ttyACM0 write_flash 0x2000 nuttx.bin
```
Then, detach the ethernet cable, reset the device, and check the device's
serial terminal (with `picocom`, for instance).
Then, on NSH, set the hostname and start the `mdnsd_event`:
```
nsh> hostname esp32p4
nsh> mdnsd_event &
mdnsd_event [8:100]
nsh> mdnsd_event: waiting for network address event
```
Then, attach the ethernet cable in a network that provides a DHCP server
and, on NuttX, run `renew eth0` to get a new IP address:
```
nsh> renew eth0
mdnsd_event: address set, starting mDNS
Local IPv4 address: 10.0.10.50
Opened 1 socket for mDNS service
Service mDNS: _http._tcp.local.:80
Hostname: esp32p4
Sending announce
```
### Results
As soon as a new IP address is set to the `eth0`, the mDNS daemon will
start. Test it on the host PC:
```
$ avahi-browse -r -t _http._tcp
+ enp0s13f0u1u4u4 IPv4 esp32p4 Web
Site local
= enp0s13f0u1u4u4 IPv4 esp32p4 Web
Site local
hostname = [esp32p4.local]
address = [10.0.10.50]
port = [80]
txt = ["test=1" "other=value"]
```
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