added debug messages

main.cxx

@@ -29,7 +29,11 @@ int main()
 
     proddb->queryCredentials();
     DatabaseClientResponse response = proddb->checkConnectivityAndCredentials();
-    if (response != Successful ) return response;
+    if (response != Successful ) {
+        cerr << "Connection to database failed because of error " << response << endl;
+        return response;
+    }
+    cout << "Connection successful!" << endl;
 
     return (-apdSerials.empty());
 }