add Config Option

src/mesh/Default.h

@@ -22,6 +22,7 @@
 #define min_node_info_broadcast_secs 60 * 60 // No regular broadcasts of more than once an hour
 #define min_neighbor_info_broadcast_secs 4 * 60 * 60
 #define default_map_publish_interval_secs 60 * 60
+#define default_network_ipv6_enabled false
 
 #define default_mqtt_address "mqtt.meshtastic.org"
 #define default_mqtt_username "meshdev"

src/mesh/NodeDB.cpp

@@ -654,6 +654,12 @@ void NodeDB::installDefaultConfig(bool preserveKey = false)
     strncpy(config.network.wifi_psk, USERPREFS_NETWORK_WIFI_PSK, sizeof(config.network.wifi_psk));
 #endif
 
+#if defined(ARCH_ESP32) && defined(USERPREFS_NETWORK_IPV6_ENABLED)
+    config.network.ipv6_enabled = USERPREFS_NETWORK_IPV6_ENABLED;
+#else
+    config.network.ipv6_enabled = default_network_ipv6_enabled;
+#endif
+
 #ifdef DISPLAY_FLIP_SCREEN
     config.display.flip_screen = true;
 #endif

src/mesh/wifi/WiFiAPClient.cpp

@@ -345,13 +345,15 @@ static void WiFiEvent(WiFiEvent_t event)
         break;
     case ARDUINO_EVENT_WIFI_STA_CONNECTED:
         LOG_INFO("Connected to access point");
+        if (config.network.ipv6_enabled) {
 #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 0)
-        WiFi.enableIPv6();
+            WiFi.enableIPv6();
 #else
-        if (!WiFi.enableIpV6()) {
-            LOG_WARN("Failed to enable IPv6");
-        }
+            if (!WiFi.enableIpV6()) {
+                LOG_WARN("Failed to enable IPv6");
+            }
 #endif
+        }
         break;
     case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
         LOG_INFO("Disconnected from WiFi access point");

userPrefs.jsonc

@@ -51,5 +51,6 @@
   // "USERPREFS_MQTT_ENCRYPTION_ENABLED": "true",
   // "USERPREFS_MQTT_TLS_ENABLED": "false",
   // "USERPREFS_MQTT_ROOT_TOPIC": "event/REPLACEME",
+  // "USERPREFS_NETWORK_IPV6_ENABLED": "1",
   "USERPREFS_TZ_STRING": "tzplaceholder                                         "
 }