Debug dongle test code

scripts/download_xterm.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""
+Pre-build script for PlatformIO
+Downloads xterm.js files for local hosting (optional)
+
+To use local files instead of CDN, run:
+    python scripts/download_xterm.py --local
+
+Then update data/index.html to use local paths instead of CDN URLs.
+"""
+
+import os
+import sys
+
+# This script runs before build but doesn't do anything by default
+# The HTML uses CDN links which work fine when you have internet
+
+def main():
+    # Check if --local flag was passed
+    if '--local' in sys.argv:
+        try:
+            import urllib.request
+            
+            data_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'data')
+            js_dir = os.path.join(data_dir, 'js')
+            css_dir = os.path.join(data_dir, 'css')
+            
+            os.makedirs(js_dir, exist_ok=True)
+            os.makedirs(css_dir, exist_ok=True)
+            
+            files = [
+                ('https://cdn.jsdelivr.net/npm/xterm@5.3.0/lib/xterm.min.js', 
+                 os.path.join(js_dir, 'xterm.min.js')),
+                ('https://cdn.jsdelivr.net/npm/xterm@5.3.0/css/xterm.min.css',
+                 os.path.join(css_dir, 'xterm.min.css')),
+                ('https://cdn.jsdelivr.net/npm/xterm-addon-fit@0.8.0/lib/xterm-addon-fit.min.js',
+                 os.path.join(js_dir, 'xterm-addon-fit.min.js')),
+                ('https://cdn.jsdelivr.net/npm/xterm-addon-web-links@0.9.0/lib/xterm-addon-web-links.min.js',
+                 os.path.join(js_dir, 'xterm-addon-web-links.min.js')),
+            ]
+            
+            for url, path in files:
+                if not os.path.exists(path):
+                    print(f'Downloading {url}...')
+                    urllib.request.urlretrieve(url, path)
+                    print(f'  -> {path}')
+            
+            print('\nLocal files downloaded!')
+            print('Update index.html to use local paths:')
+            print('  <link rel="stylesheet" href="/css/xterm.min.css">')
+            print('  <script src="/js/xterm.min.js"></script>')
+            print('  etc.')
+            
+        except Exception as e:
+            print(f'Warning: Could not download xterm.js files: {e}')
+            print('The HTML will use CDN links instead.')
+    
+    # Normal build - do nothing
+    pass
+
+if __name__ == '__main__':
+    main()