Swatantra Yadav 4ef1d60544 Documentation/netutils: add comprehensive guide for dhcpc ... Provide a complete documentation guide for the dhcpc (DHCP client) network utility in Documentation/applications/netutils/dhcpc/index.rst, replacing the previous 7-line placeholder stub. Includes: - Protocol architecture overview and RFC 2131 / RFC 1542 finite state machine (DISCOVER, OFFER, REQUEST, ACK, RELEASE) - Security considerations regarding plaintext DHCPv4, rogue servers, and network isolation - Configuration options table and networking prerequisites including CONFIG_NET_BROADCAST - NSH usage for dynamic interface configuration (ifconfig <ifname> dhcp) and verification - Public C API reference for data structures (struct dhcpc_state) and lifecycle functions with documented POSIX ERROR/errno contracts (dhcpc_open, dhcpc_request, dhcpc_request_async, dhcpc_release, dhcpc_close) - Complete, runnable C application examples demonstrating synchronous interface configuration and graceful lease release - Embedded design and tuning guidelines (lease renewal scheduling, wireless retransmission tuning, and SO_BINDTODEVICE multihomed operation) Addresses #11081 Signed-off-by: Swatantra Yadav <maverickswatantra@gmail.com>		2026-10-09 12:06:15 +08:00
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index.rst