Merge branch 'bugfix/lwip_config_dhcp_client_id_v4.2' into 'release/v4.2'

lw-ip: Add config for DHCP client id; Fix DNS server idx assert issue (v4.2)

See merge request espressif/esp-idf!16174

components/lwip/Kconfig

@@ -228,6 +228,15 @@ menu "LWIP"
             Enabling this option performs a check (via ARP request) if the offered IP address
             is not already in use by another host on the network.
 
+    config LWIP_DHCP_DISABLE_CLIENT_ID
+        bool "DHCP: Disable Use of HW address as client identification"
+        default n
+        help
+            This option could be used to disable DHCP client identification with its MAC address.
+            (Client id is used by DHCP servers to uniquely identify clients and are included
+            in the DHCP packets as an option 61)
+            Set this option to "y" in order to exclude option 61 from DHCP packets.
+
     config LWIP_DHCP_RESTORE_LAST_IP
         bool "DHCP: Restore last IP obtained from DHCP server"
         default n

components/lwip/lwip

@@ -1 +1 @@
-Subproject commit 2c9c531f0a7e0ee536db9de4f9dc54e453712087
+Subproject commit 2195f7416fb3136831babf3e96c027a73075bd4f

components/lwip/port/esp32/include/lwipopts.h

@@ -250,6 +250,10 @@
  */
 #define DHCP_DOES_ARP_CHECK             CONFIG_LWIP_DHCP_DOES_ARP_CHECK
 
+/**
+ * LWIP_DHCP_DISABLE_CLIENT_ID==1: Do not add option 61 (client-id) to DHCP packets
+ */
+#define ESP_DHCP_DISABLE_CLIENT_ID      CONFIG_LWIP_DHCP_DISABLE_CLIENT_ID
 
 /**
  * CONFIG_LWIP_DHCP_RESTORE_LAST_IP==1: Last valid IP address obtained from DHCP server