...

net/adc_device_netserver.h

@@ -131,8 +131,11 @@ protected:
         };
 
     public:
-        DeviceWrapper() {
+        DeviceWrapper() : _id()
+        {
             // null device
+            std::string_view is{"NULL-DEVICE"};
+            std::ranges::copy(_id, std::back_inserter(_id));
         };
 
         template <interfaces::adc_device_c DeviceT,