Add Helper class

import binascii

import struct

class Helper():

    @staticmethod

    def pronto2lirc(pronto):

        codes = [int(binascii.hexlify(pronto[i:i+2]), 16) for i in range(0, len(pronto), 2)]

        if codes[0]:

            raise ValueError('Pronto code should start with 0000')

        if len(codes) != 4 + 2 * (codes[2] + codes[3]):

            raise ValueError('Number of pulse widths does not match the preamble')

        frequency = 1 / (codes[1] * 0.241246)

        return [int(round(code / frequency)) for code in codes[4:]]

    @staticmethod

    def lirc2broadlink(pulses):

        array = bytearray()

        for pulse in pulses:

            pulse = int(pulse * 269 / 8192)

            if pulse < 256:

                array += bytearray(struct.pack('>B', pulse))

            else:

                array += bytearray([0x00])

                array += bytearray(struct.pack('>H', pulse))

        packet = bytearray([0x26, 0x00])

        packet += bytearray(struct.pack('<H', len(array)))

        packet += array

        packet += bytearray([0x0d, 0x05])

        # Add 0s to make ultimate packet size a multiple of 16 for 128-bit AES encryption.

        remainder = (len(packet) + 4) % 16

        if remainder:

            packet += bytearray(16 - remainder)

        return packet