diff --git a/docs/use/boards.md b/docs/use/boards.md
index 40a11aa..db80b36 100644
--- a/docs/use/boards.md
+++ b/docs/use/boards.md
@@ -24,6 +24,8 @@ OpenMQTTGateway support a low power mode for ESP32, this mode can be set by MQTT
 
 `mosquitto_pub -t "home/OpenMQTTGateway/commands/MQTTtoBT/config" -m '{"lowpowermode":2}'`
 
+The interval between the ESP32 wake up is defined at build time by the macro `TimeBtwRead`, a change of the `interval` through MQTT will not impact the time between wake up.
+
 ::: tip
 When coming back from mode 2 to mode 0 you may publish the command with a retain flag so as to enable the gateway to retrieve it when reconnecting.
 A low power mode switch is automatically created by discovery with Home Assistant, you may experience a delay between the command and the state update due to the fact that the update is published every 2 minutes.
diff --git a/main/ZgatewayBT.ino b/main/ZgatewayBT.ino
index 1dd5e6b..80cb71f 100644
--- a/main/ZgatewayBT.ino
+++ b/main/ZgatewayBT.ino
@@ -760,8 +760,8 @@ void coreTask(void* pvParameters) {
 }
 
 void lowPowerESP32() { // low power mode
-  Log.trace(F("Going to deep sleep for: %l s" CR), (BTConfig.BLEinterval / 1000));
-  deepSleep(BTConfig.BLEinterval * 1000);
+  Log.trace(F("Going to deep sleep for: %l s" CR), (TimeBtwRead / 1000));
+  deepSleep(TimeBtwRead * 1000);
 }
 
 void deepSleep(uint64_t time_in_us) {
@@ -771,7 +771,7 @@ void deepSleep(uint64_t time_in_us) {
 #  endif
 
   Log.trace(F("Deactivating ESP32 components" CR));
-  BLEDevice::deinit(true);
+  if (BLEDevice::getInitialized()) BLEDevice::deinit(true);
   esp_bt_mem_release(ESP_BT_MODE_BTDM);
   // Ignore the deprecated warning, this call is necessary here.
 #  pragma GCC diagnostic push