Troubleshooting • Screen turning itself back on after using cec-client to turn it off

Code:

import paho.mqtt.client as mqttimport subprocessimport timeimport os# MQTT ConfigurationMQTT_BROKER = "my-mqtt-broker"MQTT_PORT = 1883MQTT_COMMAND_TOPIC = "smartmirror/command"# CEC ConfigurationCEC_DEVICE_ADDRESS = "0.0.0.0"# Function to initialize CEC connectiondef initialize_cec_connection():    try:        print("Initializing CEC connection...")        cec_process = subprocess.Popen(            ['cec-client', '-d', '1'],            stdin=subprocess.PIPE,            stdout=subprocess.PIPE,            stderr=subprocess.PIPE,            text=True        )        # Sleep to give cec-client some time to initialize        time.sleep(2)        return cec_process    except Exception as e:        print(f"Error initializing CEC connection: {e}")        return None# Function to send power command via CECdef send_cec_command(cec_process, command):    if cec_process:        try:            if command.lower() == "on":                cec_process.stdin.write(f'on {CEC_DEVICE_ADDRESS}\n')            elif command.lower() == "off":                cec_process.stdin.write(f'standby {CEC_DEVICE_ADDRESS}\n')            else:                print(f"Unknown command received: {command}")                return                        cec_process.stdin.flush()            print(f"Sent command: {command}")        except Exception as e:            print(f"Error sending CEC command '{command}': {e}")# MQTT Callbacksdef on_connect(client, userdata, flags, rc):    print(f"Connected to MQTT Broker with result code {rc}")    client.subscribe(MQTT_COMMAND_TOPIC)def on_message(client, userdata, msg):    command = msg.payload.decode()    print(f"Received MQTT message: {command}")    send_cec_command(userdata['cec_process'], command)# Main functiondef main():    # Initialize CEC connection    cec_process = initialize_cec_connection()    if not cec_process:        print("Failed to initialize CEC connection. Exiting.")        return    # Initialize MQTT client    client = mqtt.Client(userdata={'cec_process': cec_process})    client.on_connect = on_connect    client.on_message = on_message    print("Connecting to MQTT broker...")    client.connect(MQTT_BROKER, MQTT_PORT, 60)    try:        print("Starting MQTT loop...")        client.loop_forever()    except KeyboardInterrupt:        print("Script interrupted by user.")    finally:        print("Disconnecting MQTT client...")        client.disconnect()        if cec_process:            print("Terminating CEC process...")            cec_process.stdin.close()            cec_process.terminate()            cec_process.wait()            print("CEC process terminated.")if __name__ == "__main__":    print("Starting CEC MQTT Control Script...")    main()