Not able to communicate with Roomba with serial port

I have an IRobot Roomba model number 565 and I am trying to control it with a Wemos D1 mini with Roomba’s OI.

I connected the TX and RX pins from my FTDI adapter to the Roombas RX and TX and I can see information (battery firmware and etc) pop up in Termite (a serial terminal) but if I send the commands 128,131,135 in sequence The Roomba doesn’t go to clean mode.

I saw somewhere that sending commands to the Roomba with the serial terminal won’t work because it will send 128 as three bytes instead of one. So I used a sketch from someone that publishes information about the Roomba into an MQTT server. So I uploaded it to my Wemos D1 mini and connected the RX and TX accordingly, but it sends “no data” and when I do a power reset it gives me a two-tone beep.

I am really confused about what does that beep mean and why isn’t it working correctly. I did try two different sketches but neither of them worked.

How can I command my Roomba to go into clean mode using my Wemos D1 mini?

EDIT: sorry for forgetting to add the links of the sketches I tried. The MQTT one is from a Youtuber called The Hook Up here is his GitHub The second one I saw while searching on why it wasn’t working, so here is that one. Also, I was trying to upload this one but I was getting a compiling error so I didn’t test it.
Also, I didn’t find anything about the error beep the Roomba is giving me. The closest thing I get while searching for it is the list of error codes and beeps but it doesn’t say anything for only 2 beeps and no voice message. I also totally forgot to mention that when I connect my Roomba with a serial adapter, open Termite(a serial terminal) and then press the clean button I get the following response

this tells me that there is a high chance that there is OI support in my Roomba.

I also tried using Python as Austin suggested but still, no luck
here is my code if you can find some sort of mistake I did ?

import serial
ser = serial.Serial("COM7", 115200) # open serial port
print(ser.name) # check which port was really used
ser.write(bytearray([128, 131, 135]))
print ("commands sent")

import serial
import time

ser = serial.Serial("COM7", 115200) # open serial port
print(ser.name) # check which port was really used
ser.write(bytearray([128, 131, 135]))
print ("commands sent")

start_time = time.time()
while time.time()-start_time < 10:
    if ser.inWaiting() > 0:
        incomming_byte = ser.read()
        print(incomming_byte),      #Prints bytes interpreted as ascii/char values
        #print(ord(incomming_byte)) #Prints bytes interpreted as decimal values

ser.close()