Refactor golden image handling in backup upload process</message>

<message>Update the _set_golden_from_path function to improve the handling of existing golden image files. Replace the existing unlink logic with a more robust method that safely removes files or broken symlinks using the missing_ok parameter. This change enhances the reliability of the backup upload process by ensuring that stale references are properly cleared before setting a new golden image path.

backup-from-device/gnss-guard/test_buzzer.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+"""
+Buzzer Test Script for reTerminal DM4
+Tests various buzzer patterns and functions
+"""
+
+import subprocess
+import time
+import sys
+
+BUZZER_PATH = '/sys/class/leds/usr-buzzer/brightness'
+
+def buzzer_on():
+    """Turn buzzer ON"""
+    subprocess.run(['sudo', 'tee', BUZZER_PATH], 
+                  input='1', text=True, 
+                  stdout=subprocess.DEVNULL, 
+                  stderr=subprocess.DEVNULL)
+
+def buzzer_off():
+    """Turn buzzer OFF"""
+    subprocess.run(['sudo', 'tee', BUZZER_PATH], 
+                  input='0', text=True, 
+                  stdout=subprocess.DEVNULL, 
+                  stderr=subprocess.DEVNULL)
+
+def beep(duration=0.2):
+    """Play a single beep"""
+    buzzer_on()
+    time.sleep(duration)
+    buzzer_off()
+
+def blink(count=3, on_time=0.1, off_time=0.1):
+    """Blink buzzer multiple times"""
+    for _ in range(count):
+        buzzer_on()
+        time.sleep(on_time)
+        buzzer_off()
+        time.sleep(off_time)
+
+def get_status():
+    """Get current buzzer status"""
+    try:
+        result = subprocess.run(['cat', BUZZER_PATH], 
+                              capture_output=True, text=True, check=True)
+        return 'ON' if result.stdout.strip() in ['1', '255'] else 'OFF'
+    except:
+        return 'UNKNOWN'
+
+def main():
+    print("=" * 50)
+    print("  reTerminal DM4 Buzzer Test Script (Python)")
+    print("=" * 50)
+    print()
+    
+    # Test 1: Single beep
+    print("Test 1: Single beep (0.2s)")
+    beep(0.2)
+    time.sleep(0.5)
+    
+    # Test 2: Double beep
+    print("Test 2: Double beep")
+    blink(2, 0.1, 0.1)
+    time.sleep(0.5)
+    
+    # Test 3: Triple beep
+    print("Test 3: Triple beep")
+    blink(3, 0.1, 0.1)
+    time.sleep(0.5)
+    
+    # Test 4: Long beep
+    print("Test 4: Long beep (0.5s)")
+    beep(0.5)
+    time.sleep(0.5)
+    
+    # Test 5: Rapid beeps
+    print("Test 5: Rapid beeps (5x)")
+    blink(5, 0.05, 0.05)
+    time.sleep(0.5)
+    
+    # Test 6: Slow beeps
+    print("Test 6: Slow beeps (3x)")
+    blink(3, 0.3, 0.3)
+    time.sleep(0.5)
+    
+    # Test 7: Success pattern
+    print("Test 7: Success pattern (2 short)")
+    blink(2, 0.1, 0.1)
+    time.sleep(0.5)
+    
+    # Test 8: Error pattern
+    print("Test 8: Error pattern (3 fast)")
+    blink(3, 0.05, 0.05)
+    time.sleep(0.5)
+    
+    # Ensure buzzer is off
+    buzzer_off()
+    
+    print()
+    print("=" * 50)
+    print("  Buzzer test complete!")
+    print("=" * 50)
+    print()
+    print(f"Current buzzer status: {get_status()}")
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        print("\n\nTest interrupted by user")
+        buzzer_off()
+        sys.exit(0)
+    except Exception as e:
+        print(f"\n\nError: {e}")
+        buzzer_off()
+        sys.exit(1)