diff --git a/WifiControlSensor/MQTT.ino b/WifiControlSensor/MQTT.ino
index 691a3cd..8d11395 100644
--- a/WifiControlSensor/MQTT.ino
+++ b/WifiControlSensor/MQTT.ino
@@ -25,6 +25,8 @@ char GPIO_SET_FEED[MAXSUBSCRIPTIONS][FEED_MAX_SIZE] = {};
 
 Adafruit_MQTT_Publish * mqttGpio[MAXSUBSCRIPTIONS] = {};
 
+bool isMqttConfigured = false;
+
 int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname) {
   mqttId = hostname;
   snprintf(temperatureFeed, FEED_MAX_SIZE, TEMPERATURE_FEED_FORMAT, mqttId);
@@ -34,6 +36,8 @@ int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname)
   mqtt_temp =  new Adafruit_MQTT_Publish(mqtt, temperatureFeed);
   mqtt_pressure =  new Adafruit_MQTT_Publish(mqtt, pressureFeed);
 
+  isMqttConfigured = server[0] != '\0';
+
   for (int i = 0 ; i < NB_ELEMENTS(gpioWatched) && i < MAXSUBSCRIPTIONS; i++) {
     snprintf(GPIO_FEED[i], FEED_MAX_SIZE, GPIO_FEED_FORMAT, mqttId, gpioWatched[i]);
     snprintf(GPIO_SET_FEED[i], FEED_MAX_SIZE, GPIO_SET_FEED_FORMAT, mqttId, gpioWatched[i]);
@@ -47,6 +51,9 @@ int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname)
   return 0;
 }
 
+bool MqttIsConfigured(){
+  return isMqttConfigured;
+}
 int MqttIsConnected() {
   return mqtt->connected();
 }
diff --git a/WifiControlSensor/WifiControlSensor.ino b/WifiControlSensor/WifiControlSensor.ino
index a44ead8..e56e167 100644
--- a/WifiControlSensor/WifiControlSensor.ino
+++ b/WifiControlSensor/WifiControlSensor.ino
@@ -80,6 +80,7 @@ int MqttSetup(char *server, char *user, char *passwd, int port, char * hostname)
 int MqttPublish(double temp, double pressure);
 void MqttCheckSubscription();
 void MqttChangeGpioValue(int gpio, int value);
+bool MqttIsConfigured();
 
 void WifiSetup(int bootmode, int forceSetup, char *confSsid, char *confPassword, char *confHost) {
   IPAddress myIP;
@@ -215,7 +216,8 @@ void loop() {
     ArduinoOTA.handle();
   } else {
     server.handleClient();
-    MqttCheckSubscription();
+    if (MqttIsConfigured())
+      MqttCheckSubscription();
     delay(CONFIG_WEB_DELAY_MS);
 
     nbCycle++;
@@ -225,7 +227,8 @@ void loop() {
         SKETCH_DEBUG_PRINT(temp);
         SKETCH_DEBUG_PRINT( " Pressure mB ");
         SKETCH_DEBUG_PRINTLN(pressure);
-        MqttPublish(temp, pressure);
+        if (MqttIsConfigured())
+          MqttPublish(temp, pressure);
       } else {
         SKETCH_DEBUG_PRINTLN("Cannot get T°C");
       }