"RX ring buffer full" error despite flushing buffers in PySerial

[Qlexio]

I'm working on a project where I use the PySerial module to communicate with a battery management system (BMS) through a serial port. I'm also using ThingsBoard and Streamlit in this project. However, I keep encountering the "RX ring buffer full" error, even though I am flushing the buffers each time. Additionally, the lines I read are different every time I run the code.

Code:
import serial
import csv
from time import sleep

responseArray = list()

def writeBatteryData(rest_client, batteryUsed):
"""Writes the battery attributes' values to the connected BMS

Args:
    batteryUsed (str): Battery used in the battery instance

Returns:
    None
"""
with open('deviceForms/batteryForm.csv', 'r') as csvfile:
    csvForm = csv.reader(csvfile)
    form = list(csvForm)
    numRows = len(form)

batteryForm = getDeviceAttributes(rest_client, batteryUsed, form, numRows)
start = 0
for start in range(numRows):
    if form[start][0] == 'Charge Overcurrent':
        break

with open('deviceForms/batteryThingSetCommands.csv', 'r') as csvfile:
    csvForm = csv.reader(csvfile)
    batteryCommandsForm = list(csvForm)

ser = serial.Serial(port='/dev/ttyACM1', baudrate=115200, timeout=5)
ser.reset_input_buffer()
ser.reset_output_buffer()
ser.write(b'select thingset\r\n')
response = ser.readline()

for i in range(start, numRows):
    ser.write((batteryCommandsForm[i-start][1] + str(batteryForm[i][1]) + '}\r\n').encode())
    sleep(0.1)
    response = ser.readline()
    responseArray.append(response)
    sleep(0.1)
    # Flushing buffer using read()
    if ser.in_waiting > 0:
        data = ser.read(ser.in_waiting)

ser.close()
print(responseArray)

writeBatteryData(rest_client, "NMCBattery")

Steps to Reproduce:

1.Run the provided code snippet.
2.Observe the "RX ring buffer full" error and the varying lines read each time.

Expected Behavior:
The buffers should be flushed correctly, and the RX ring buffer should not overflow. The lines read should be consistent.

Actual Behavior:
Encountering "RX ring buffer full" error and inconsistent lines being read.

Additional Information:

1. ThingsBoard and Streamlit are being used in the project.
   2.I've tried flushing the buffers using ser.reset_input_buffer(), ser.reset_output_buffer(), and ser.read(ser.in_waiting) but the issue persists.

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This issue has been cloned from: pyserial#766