diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..44e504f
Binary files /dev/null and b/.DS_Store differ
diff --git a/src/ESP32-mqtt-room.ino b/src/ESP32-mqtt-room.ino
index 93506ea..3d25cf7 100644
--- a/src/ESP32-mqtt-room.ino
+++ b/src/ESP32-mqtt-room.ino
@@ -318,6 +318,25 @@ bool reportDevice(BLEAdvertisedDevice advertisedDevice) {
 	String mac_address = advertisedDevice.getAddress().toString().c_str();
 	mac_address.replace(":","");
 	mac_address.toLowerCase();
+
+
+	//Check scanned MAC Address against a list of allowed MAC Addresses
+
+	if (allowedListCheck) {
+		bool allowedListFound = false;
+		for (uint32_t x = 0; x < allowedListNumberOfItems; x++) {
+			if (mac_address == allowedList[x]) {
+				allowedListFound = true;
+			}
+		}
+
+		if (allowedListFound == false) {
+			return false;
+		}
+	}
+	// --------------
+
+
 	// Serial.print("mac:\t");
 	// Serial.println(mac_address);
 	int rssi = advertisedDevice.getRSSI();
diff --git a/src/Settings.h b/src/Settings.h
index 0d28014..5cbc637 100644
--- a/src/Settings.h
+++ b/src/Settings.h
@@ -49,3 +49,10 @@
 
 // MQTT topic for sensor values from HTU21D temperature and humidity sensor
 //#define htuSensorTopic "presence_nodes/" hostname "/sensor"
+
+
+//List of allowed MAC Addresses for MQTT Publish. All others will be ignored.
+//Feature is disabled by default.
+#define allowedListCheck false
+String allowedList[] = {"11223344aabb", "11223344aabb"};
+uint32_t allowedListNumberOfItems = 2;