import serial
import time

print("Opening serial port /dev/cu.usbmodem101...")
try:
    ser = serial.Serial('/dev/cu.usbmodem101', 115200, timeout=1.0)
    print("Opened successfully!")
    
    # Clear input buffer
    ser.reset_input_buffer()
    
    # Send Ctrl-C to interrupt anything
    print("Sending Ctrl-C...")
    ser.write(b'\x03')
    time.sleep(0.2)
    
    # Read response
    if ser.in_waiting:
        print(f"After Ctrl-C: {ser.read(ser.in_waiting)}")
        
    # Send newline
    print("Sending newline...")
    ser.write(b'\r\n')
    time.sleep(0.2)
    if ser.in_waiting:
        print(f"After newline: {ser.read(ser.in_waiting)}")
        
    # Send test print command
    print("Sending test print command...")
    ser.write(b"print('REPL_ACTIVE')\r\n")
    time.sleep(0.5)
    if ser.in_waiting:
        print(f"After command: {ser.read(ser.in_waiting)}")
    else:
        print("No response to command.")
        
    ser.close()
except Exception as e:
    print(f"Error: {e}")