diff --git a/src/lightingFirmware/SimpleBleDevice/SimpleBleDevice.ino b/src/lightingFirmware/SimpleBleDevice/SimpleBleDevice.ino
index 531d07a..45cfc64 100644
--- a/src/lightingFirmware/SimpleBleDevice/SimpleBleDevice.ino
+++ b/src/lightingFirmware/SimpleBleDevice/SimpleBleDevice.ino
@@ -70,8 +70,8 @@ void setup() {
 void loop() {
     // notify changed value
     if (deviceConnected) {
-        btmessage = pCharacteristic->getValue().c_str();
-        mode = btmessage;
+        btmessage = pCharacteristic->getData();
+         mode = btmessage;
     }
     // disconnecting
     if (!deviceConnected && oldDeviceConnected) {
diff --git a/src/lightingFirmware/esp32_test0/esp32_test0.ino b/src/lightingFirmware/esp32_test0/esp32_test0.ino
index a5c9dc5..7b3696e 100644
--- a/src/lightingFirmware/esp32_test0/esp32_test0.ino
+++ b/src/lightingFirmware/esp32_test0/esp32_test0.ino
@@ -255,6 +255,7 @@ void dmxSetup() {
 
 void setup() {
 	Serial.begin(115200);
+  delay(2000);
   Serial.print("\nIf you receive this message, ESP32 module has finished setting up Serial Interface for communication.");
     // Create the BLE Device
   BLEDevice::init("Pupilometer LED Billboard");
@@ -288,11 +289,10 @@ void setup() {
   pAdvertising->setScanResponse(false);
   pAdvertising->setMinPreferred(0x0);  // set value to 0x00 to not advertise this parameter
   BLEDevice::startAdvertising();
-  Serial.println("Waiting a client connection to notify...");
+  Serial.println("\nWaiting a client connection to notify...");
 
 	pinMode(INTERRUPT_PIN, INPUT_PULLUP);
 	attachInterrupt(digitalPinToInterrupt(INTERRUPT_PIN), isr, RISING);
-  delay(2000);
   dmxSetup();
   const dmx_port_t dmx_num = DMX_NUM_1;
   Serial.println("Welcome to Pupilometer LED Billboard!");
@@ -305,8 +305,13 @@ void loop() {
 
   // notify changed value
   if (deviceConnected) {
-      btmessage = pCharacteristic->getValue().c_str();
-      mode = btmessage.toInt();
+      Serial.printf("\nI received the following string: %s",String(pCharacteristic->getValue()));
+      Serial.printf("\nI received the following bytes: ");
+      uint8_t* btMessage = pCharacteristic->getData();
+      for (int i = 0; i < sizeof(btMessage); i++){
+        Serial.printf("%d ",btMessage[i]);
+      };
+      delay(100);
   }
   // disconnecting
   if (!deviceConnected && oldDeviceConnected) {