Example 1:

import serial
import time

wakeup_cmd = bytes([0x00])
host_mode_cmd = bytes([0x07, 0xC6, 0x04, 0x08, 0x00, 0x8A, 0x08, 0xFE, 0x95])
start_scan_cmd = bytes([0x04, 0xE4, 0x04, 0x00, 0xFF, 0x14])
stop_scan_cmd = bytes([0x04, 0xE5, 0x04, 0x00, 0xFF, 0x13])

print('Open serial port')
ser = serial.Serial('COM4', 9600, timeout=1)  # Adjust the port name and baud rate as needed

try:
    print('Wake up!')
    ser.write(wakeup_cmd)
    time.sleep(0.05)
    
    print('Host mode')
    ser.write(host_mode_cmd) 
    time.sleep(0.5)
    
    print('Start scan')
    ser.write(start_scan_cmd)
    time.sleep(3)

    print('Stop scan')
    ser.write(stop_scan_cmd)
    time.sleep(1)

    print('Bytes waiting at serial port: ' + str(ser.in_waiting))
    response = ser.read(ser.in_waiting)
    print("Received:", response.decode())

except Exception as e:
    print("Error communicating with serial device: ", e)

finally:
    print("Close serial port")
    ser.close()

The output:

Open serial port
Wake up!
Host mode
Start scan
Stop scan
Bytes waiting at serial port: 0
Received:
Close serial port

Doing something simpler doesn't work either:

Example 2:

software_version_cmd = bytes([0x04, 0xA3, 0x04, 0x00, 0xFF, 0x55])

print('Open serial port')
ser = serial.Serial('COM4', 9600, timeout=1)  # Adjust the port name and baud rate as needed

try:
    print('Wake up!')
    ser.write(wakeup_cmd)
    time.sleep(0.05)
    
    print('Check software version')
    ser.write(software_version_cmd)
    time.sleep(1)

    print('Bytes waiting at serial port: ' + str(ser.in_waiting))
    response = ser.read(ser.in_waiting)
    print("Received:", response.decode())

except Exception as e:
    print("Error communicating with serial device: ", e)

finally:
    print("Close serial port")
    ser.close()

The output:

Open serial port
Wake up!
Check software version
Bytes waiting at serial port: 0
Received:
Close serial port

Note I think there is a typo in line 49.

Serial2.write(start_scan_cmd, sizeof(stop_scan_cmd));

should probably be

Serial2.write(stop_scan_cmd, sizeof(stop_scan_cmd));

1. Send wake-up and wait 50ms ( 0x0)
2. Send host command (0x 07 C6 04 08 00 8A 08 FE 9)
   what now?
3. start decoding (0x 04 E4 04 00 FF 14) wait x ms
4. stop decoding (0x 04 E5 04 00 FF 13)
5. read from serial port

or is the sequence something else?

Grateful for your help!