add network options, IPv6 for mqtt

lib/framework/MqttSettingsService.cpp

@@ -101,6 +101,7 @@ void MqttSettingsService::WiFiEvent(WiFiEvent_t event, WiFiEventInfo_t info) {
     switch (event) {
     case SYSTEM_EVENT_STA_GOT_IP:
     case SYSTEM_EVENT_ETH_GOT_IP:
+    case SYSTEM_EVENT_GOT_IP6:
         if (_state.enabled) {
             // emsesp::EMSESP::logger().info(F("Network connection found, starting MQTT client"));
             onConfigUpdated();