IWRL6432BOOST: Unable to read UART output using custom Python code

I have a IWRL6432Boost device which I've managed to use successfully for the Motion/Presence Demo, but now when I want to read the raw data transmitted over USB UART, I get nothing but empty dictionaries. The same code works perfectly for xWR1642Boost devices so I am unsure of what I am doing wrong here.

The code snippet I'm using is below, its very small.

---

# Package imports
from serial import Serial
import serial.tools.list_ports
import numpy as np
import time
  
## Change the configuration file name
configFileName = '6432config_pr.cfg'

com_uart = {}
com_data = {}
byteBuffer = np.zeros(2**15,dtype = 'uint8')
byteBufferLength = 0

# Serial configuration scheme
# Connect to the device via serial
def serialConfig(configFilename):
    global com_uart
    global com_data
    
    # Windows configuration
    com_uart = Serial("COM4", 115200) # 4 for 6432; 7 for 1642
    com_data = Serial("COM5", 921600) # 5 for 6432; 6 for 1642

    # Read in the configuration file and transmit to the device. Instead of hardcoding the config file to the device to allow for modification
    config = [line.rstrip('\r\n') for line in open(configFileName)]
    for i in config:
        com_uart.write((i+'\n').encode())
        print(i)
        time.sleep(0.01)
        
    print('\n')
    return com_uart, com_data

# Configurate the serial port
com_uart, com_data = serialConfig(configFileName)

# Main loop 
while True:
    # Parser - separate into own function for ease
    readBuffer = com_data.read(com_data.in_waiting)
    # readBuffer = com_data.read(com_data.in_waiting)
    byteVec = np.frombuffer(readBuffer, dtype = 'uint8')
    byteCount = len(byteVec)
    
    print(readBuffer)
    time.sleep(0.03) # Sampling frequency of 30 Hz

--

The switches on my device are configured as follows, as recommended by the Visualizer for loading the Motion/Presence demo:

S1: 100011

S3: 0010

Thank you in advance!