nuttxs opened a new pull request, #3206:
URL: https://github.com/apache/nuttx-apps/pull/3206
## Summary
netlib/netlib_delipv4dnsaddr.c: add DNS deletion functionality, support
deleting DNS servers by address or by index:
```
netlib_del_ipv4dnsaddr()
netlib_del_ipv4dnsaddr_by_index()
netlib_del_ipv6dnsaddr()
netlib_del_ipv6dnsaddr_by_index()
```
```
Multi-DNS delete Call-Chain Implementation:
Application Layer: netlib_del_ipv4dnsaddr() / netlib_del_ipv6dnsaddr()
↓
Network Layer: dns_del_nameserver()
↓
Storage Layer: g_dns_servers[] array
```
## Impact
New Feature/Change: Yes
User Impact: support delete the DNS server address by index or address
Build Impact:No new Kconfig options or build system changes.
Hardware Impact: No
Security: No
Compatibility: Backward-compatible; no breaking changes.
## Testing
Test process example
```
// Add the first DNS server
netlib_set_ipv4dnsaddr(&dns1);
// Add the second DNS server
netlib_set_ipv4dnsaddr(&dns2);
// List all DNS servers
dns_foreach_nameserver(print_dns_callback, &count);
// Delete DNS server by index
netlib_del_ipv4dnsaddr_by_index(0);
// Delete DNS server by address
netlib_del_ipv4dnsaddr(&dns2);
```
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