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The dhcp_renew() loop was cargo-culted from Arduino ESP8266's WiFi.hostname() which was designed for changing the hostname on an already-connected system with multiple interfaces (WiFi+Ethernet). In ESPHome, wifi_apply_hostname_() is only called from: - setup_() — before WiFi connects (link never up) - wifi_sta_connect_() — after wifi_disconnect_() (link always down) The hostname is fixed at compile time and never changes at runtime. Setting intf->hostname is sufficient — lwIP automatically includes it in DHCP DISCOVER/REQUEST packets via LWIP_NETIF_HOSTNAME. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
