Update readme

Author: spuder

README.md

@@ -244,7 +244,7 @@ Use the [MQTTX client](https://mqttx.app) to observe the messages that OpenSpool
 
 
 ```bash
-mqttx sub -t 'device/$SERIAL_NUMBER/report' -u -P $LAN_ACCESS_CODE --mqtt-version 3.1.1 -h $IP_ADDRESS -p 8883 -l mqtts --insecure
+mqttx sub -t 'device/$SERIAL_NUMBER/report' -u bblp -P $LAN_ACCESS_CODE --mqtt-version 3.1.1 -h $IP_ADDRESS -p 8883 -l mqtts --insecure
 ```
 
 ## 🎥 Demo

extras/shipping/get_mac.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+
+import subprocess
+import re
+import sys
+import qrcode
+from PIL import Image, ImageDraw, ImageFont
+
+def get_esp32_mac():
+    try:
+        result = subprocess.run(['esptool.py', 'read_mac'], capture_output=True, text=True, check=True)
+        mac_addresses = re.findall(r'MAC: ([0-9A-Fa-f:]{17})', result.stdout)
+        
+        if len(mac_addresses) == 0:
+            print("Error: No ESP32 device found.")
+            sys.exit(1)
+        elif len(mac_addresses) == 2 and mac_addresses[0] == mac_addresses[1]:
+            return mac_addresses[0]  # Return the single MAC address if both are identical
+        elif len(mac_addresses) > 1:
+            print("Error: Multiple ESP32 devices detected. Please connect only one device.")
+            sys.exit(1)
+        
+        return mac_addresses[0]
+    except subprocess.CalledProcessError:
+        print("Error: Failed to read MAC address. Make sure esptool.py is installed and the device is connected.")
+        sys.exit(1)
+
+def generate_qr_code_with_text(url):
+    # Generate QR code
+    qr = qrcode.QRCode(version=1, box_size=10, border=4)
+    qr.add_data(url)
+    qr.make(fit=True)
+    qr_img = qr.make_image(fill_color="black", back_color="white")
+
+    # Convert to RGB mode if it's not already
+    if qr_img.mode != 'RGB':
+        qr_img = qr_img.convert('RGB')
+
+    # Set up font
+    try:
+        font = ImageFont.truetype("Arial.ttf", 20)
+    except IOError:
+        font = ImageFont.load_default()
+
+    # Calculate text size
+    draw = ImageDraw.Draw(qr_img)
+    bbox = draw.textbbox((0, 0), url, font=font)
+    text_width = bbox[2] - bbox[0]
+    text_height = bbox[3] - bbox[1]
+
+    # Create a new image with space for QR code and text
+    padding = 20  # Padding around the QR code and text
+    img_width = max(qr_img.width, text_width) + (padding * 2)
+    img_height = qr_img.height + text_height + (padding * 3)  # Extra padding between QR and text
+    img = Image.new('RGB', (img_width, img_height), color='white')
+
+    # Paste QR code
+    qr_x = (img_width - qr_img.width) // 2
+    qr_y = padding
+    img.paste(qr_img, (qr_x, qr_y))
+
+    # Add text below QR code
+    draw = ImageDraw.Draw(img)
+    text_x = (img_width - text_width) // 2
+    text_y = qr_y + qr_img.height + padding
+    draw.text((text_x, text_y), url, font=font, fill="black")
+
+    # Display the image
+    img.show()
+
+    # Optionally, save the image
+    # img.save("qr_code_with_url.png")
+
+def main():
+    mac_address = get_esp32_mac()
+    last_six_digits = mac_address.replace(':', '')[-6:]
+    url = f"http://openspool-{last_six_digits.lower()}.local"
+    print(f"Generated URL: {url}")
+    
+    generate_qr_code_with_text(url)
+    print("QR code with URL text has been generated and displayed.")
+
+if __name__ == "__main__":
+    main()