diff --git a/OpenMQTTGateway.ino b/OpenMQTTGateway.ino
index 2e9eb09..ec025a7 100644
--- a/OpenMQTTGateway.ino
+++ b/OpenMQTTGateway.ino
@@ -596,6 +596,7 @@ void loop()
       if(RFM69toMQTT())
       trc(F("RFM69toMQTT OK"));
     #endif
+    #if defined(ESP8266) || defined(ESP32)
     unsigned long now = millis();
     if (now > (timer_sys_measures + TimeBetweenReadingSYS)) {//retriving value of memory ram every TimeBetweenReadingSYS
       timer_sys_measures = millis();
@@ -604,6 +605,7 @@ void loop()
       freeMem = ESP.getFreeHeap();
       trc(String(freeMem));
     }
+    #endif
   }
 }
 
diff --git a/tests/Test_config.h b/tests/Test_config.h
index 4e85377..9d7bdce 100644
--- a/tests/Test_config.h
+++ b/tests/Test_config.h
@@ -168,5 +168,6 @@ const byte subnet[] = { 255, 255, 255, 0 }; //ip adress
 //variables to avoid duplicates
 #define time_avoid_duplicate 3000 // if you want to avoid duplicate mqtt message received set this to > 0, the value is the time in milliseconds during which we don't publish duplicates
 
+#define TimeBetweenReadingSYS 30000 // time between system readings (like memory)
 /*-------------------ACTIVATE TRACES----------------------*/
 #define TRACE 1  // 0= trace off 1 = trace on