monitor_usb.py

#!/usr/bin/env python3
import time
import os

print("USB ESP32 Monitor - Press Ctrl+C to stop")
print("This will check if /dev/ttyACM0 exists every 0.1 seconds")
print("Times when device disappears will show the pattern")

count = 0
last_state = None

try:
    while True:
        exists = os.path.exists('/dev/ttyACM0')
        current_time = time.time()
        
        if exists != last_state:
            state_str = "CONNECTED" if exists else "DISCONNECTED"
            print(f"[{current_time:.3f}] {state_str}")
            last_state = exists
        
        count += 1
        if count % 50 == 0:  # Print alive signal every 5 seconds
            print(f"[{current_time:.3f}] Monitoring... (state: {'UP' if exists else 'DOWN'})")
        
        time.sleep(0.1)
        
except KeyboardInterrupt:
    print("\nMonitoring stopped")