Add "Get Global IPv6 Address" and update the example.

libraries/WiFi/examples/WiFiIPv6/WiFiIPv6.ino

@@ -82,8 +82,10 @@ void WiFiEvent(WiFiEvent_t event){
             WiFi.enableIpV6();
             break;
         case ARDUINO_EVENT_WIFI_STA_GOT_IP6:
-            Serial.print("STA IPv6: ");
+            Serial.print("STA Local IPv6: ");
             Serial.println(WiFi.localIPv6());
+            Serial.print("STA Global IPv6: ");
+            Serial.println(WiFi.globalIPv6());
             break;
         case ARDUINO_EVENT_WIFI_AP_GOT_IP6:
             Serial.print("AP IPv6: ");

libraries/WiFi/src/WiFiSTA.cpp

@@ -817,7 +817,7 @@ bool WiFiSTAClass::enableIpV6()
 }
 
 /**
- * Get the station interface IPv6 address.
+* Get the station interface local link IPv6 address.
  * @return IPv6Address
  */
 IPv6Address WiFiSTAClass::localIPv6()
@@ -832,6 +832,22 @@ IPv6Address WiFiSTAClass::localIPv6()
     return IPv6Address(addr.addr);
 }
 
+/**
+* Get the station interface global IPv6 address.
+ * @return IPv6Address
+ */
+IPv6Address WiFiSTAClass::globalIPv6()
+{
+	esp_ip6_addr_t addr;
+    if(WiFiGenericClass::getMode() == WIFI_MODE_NULL){
+        return IPv6Address();
+    }
+    if(esp_netif_get_ip6_global(get_esp_interface_netif(ESP_IF_WIFI_STA), &addr)) {
+        return IPv6Address();
+    }
+    return IPv6Address(addr.addr);
+}
+
 
 bool WiFiSTAClass::_smartConfigStarted = false;
 bool WiFiSTAClass::_smartConfigDone = false;

libraries/WiFi/src/WiFiSTA.h

@@ -95,6 +95,7 @@ class WiFiSTAClass
 
     bool enableIpV6();
     IPv6Address localIPv6();
+    IPv6Address globalIPv6();
 
     // STA WiFi info
     static wl_status_t status();