can you explain the following code with inline comments. Please response in code snippet window:


from pymodbus.client import ModbusSerialClient

from utils import modbus_rtu, constants, report
from app_loadsim import power_lut

import time, asyncio

from app_loadsim import usb_rly16 as rly
from utils import decoder as deco
import pandas as pd
import datetime as datetime


if __name__ == "__main__":

    loop = asyncio.get_event_loop()

    # Ports initialize
    # ----------------

    # Relay board
    ls_board = rly.UsbRly16()  # Set the serial port and baud rate
    fresh_start = ls_board.write(b"\x6E")

    # Modbus dongle
    client = ModbusSerialClient(method="rtu", port=constants.METER_PORT, stopbits=1, bytesize=8, parity="N", baudrate=9600)

    # Connect to the serial modbus dongle
    if client.connect():
        print("\nModBus initialized successfully!\n")
        time.sleep(2)
    else:
        print("\nModBus initialization error!\n")

    ls_meter = modbus_rtu.Device(client, slave_address=21)  # Place meter address
    ls_meter._load_map(constants.FILE_PATH.encode("utf-8").decode("unicode-escape") + "devices_map/" + "DFPM91_mono-phase.csv")  # Load Map
    # Read meters
    meter_time = ls_time = int(datetime.datetime.now().timestamp())
    print("Simulation started: ", end="")
    print(datetime.datetime.fromtimestamp(meter_time).strftime("%Y-%m-%d %H:%M:%S"))
    meter_step, ls_step = 1, 5
    i = 0
    try:

        while True:
            # ****************************
            # **      Relay Board       **
            # ****************************class

            if int(datetime.datetime.now().timestamp()) >= ls_time + ls_step:
                ls_time = int(datetime.datetime.now().timestamp())
                i += 1

            # ****************************
            # **        Meters          **
            # ****************************
            if int(datetime.datetime.now().timestamp()) >= meter_time + meter_step:
                ls_value = loop.run_until_complete(ls_board.demo(i))
                time.sleep(1)
                if ls_value == "EOF":
                    client.close()
                    print("closed meters client sucessfully")
                    loop.run_until_complete(ls_board.port_close())
                    # ls_board.write(b"\x6E")
                    # ls_board.close()  # Close the serial port connection
                    print("closed relay board client sucessfully")
                    break
                # print("Event: Running every 1 seconds precisely")
                result = ls_meter.read_bulk(2, 5, decode=False)
                if result is None:
                    continue
                else:
                    decoded_result = deco.decode_bulk(obj=ls_meter, data_list=result)
                    for j in range(0, len(decoded_result[0]), 1):
                        print(decoded_result[0][j] + ": " + str(decoded_result[1][j]))
                    meter_time = int(datetime.datetime.now().timestamp())
                    # print(decoded_result)
                    aux_lst = [meter_time]
                    aux_lst.extend(decoded_result[1])
                    aux_lst.append(ls_value[1])
                    report.custom_lst.append(aux_lst)
        # ****************************
        # **        Report          **
        # ****************************
        labels = ["timestamp"]
        labels.extend(decoded_result[0])
        labels.append("ls power")
        report.report_gen(report_columns=labels)

    except (KeyboardInterrupt):
        client.close()
        print("closed meters client sucessfully")
        loop.run_until_complete(ls_board.port_close())
        # ls_board.write(b"\x6E")
        # ls_board.close()  # Close the serial port connection
        print("closed relay board client sucessfully")
        labels = ["timestamp"]
        labels.extend(decoded_result[0])
        labels.append("ls power")
        report.report_gen(report_columns=labels)