lwip: added config option to enable LWIP_NETIF_API

components/lwip/Kconfig

@@ -7,6 +7,15 @@ menu "LWIP"
             The default name this device will report to other devices on the network.
             Could be updated at runtime with esp_netif_set_hostname()
 
+    config LWIP_NETIF_API
+        bool "Enable usage of standard POSIX APIs in LWIP"
+        default n
+        help
+            If this feature is enabled, standard POSIX APIs: if_indextoname(), if_nametoindex()
+            could be used to convert network interface index to name
+            instead of IDF specific esp-netif APIs (such as esp_netif_get_netif_impl_name())
+
+
     config LWIP_DNS_SUPPORT_MDNS_QUERIES
         bool "Enable mDNS queries in resolving host name"
         default y

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

@@ -448,6 +448,11 @@
  */
 #define LWIP_NETIF_TX_SINGLE_PBUF             1
 
+/**
+ * LWIP_NETIF_API==1: Enable usage of standard POSIX APIs in LWIP.
+ */
+#define LWIP_NETIF_API                      CONFIG_LWIP_NETIF_API
+
 /*
    ------------------------------------
    ---------- LOOPIF options ----------
@@ -949,6 +954,7 @@
 #define ESP_IP4_ATON                    1
 #define ESP_LIGHT_SLEEP                 1
 #define ESP_L2_TO_L3_COPY               CONFIG_LWIP_L2_TO_L3_COPY
+#define LWIP_NETIF_API                  CONFIG_LWIP_NETIF_API
 #define ESP_STATS_MEM                   CONFIG_LWIP_STATS
 #define ESP_STATS_DROP                  CONFIG_LWIP_STATS
 #define ESP_STATS_TCP                   0

examples/protocols/sockets/tcp_client_multi_net/main/tcp_client_multiple.c

@@ -47,7 +47,11 @@ static void app_multiple_handle(esp_ip4_addr_t *ip4_addr, esp_netif_t *esp_netif
      */
 #if CONFIG_EXAMPLE_BIND_SOCKET_TO_NETIF_NAME
     struct ifreq ifr;
+#if !CONFIG_LWIP_NETIF_API
     esp_netif_get_netif_impl_name(esp_netif, ifr.ifr_name);
+#else
+    if_indextoname(esp_netif_get_netif_impl_index(esp_netif), ifr.ifr_name);
+#endif
     int ret = setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,  (void*)&ifr, sizeof(struct ifreq));
     if (ret < 0) {
         ESP_LOGE(TAG, "\"%s\" Unable to bind socket to specified interface: errno %d", netif_name, errno);