You can now do: wmbusmeters --analyze=driver.xmq <hex>

src/metermanager.cc

@@ -298,6 +298,16 @@ public:
     {
         string best_driver = "";
 
+        if (only != "")
+        {
+            DriverInfo di;
+            if (!lookupDriverInfo(only, &di))
+            {
+                error("No such driver %s\n", only.c_str());
+            }
+            only = di.name().str();
+        }
+
         for (DriverInfo *ndr : allDrivers())
         {
             string driver_name = toString(*ndr);

src/meters.cc

@@ -195,9 +195,10 @@ string loadDriver(const string &file)
     // Check that the driver name has not been registered before!
     if (lookupDriver(di.name().str()) != NULL)
     {
-        error("Cannot load driver %s %s since it is already registered!\n",
+        debug("Ignoring loaded driver %s %s since it is already registered!\n",
               di.name().str().c_str(),
               file.c_str());
+        return di.name().str();
     }
 
     // Check that no other driver also triggers on the same detection values.