How to use the esptool.HexFormatter function in esptool

def command(self, op=None, data=b"", chk=0, wait_response=True, timeout=DEFAULT_TIMEOUT):
        saved_timeout = self._port.timeout
        new_timeout = min(timeout, MAX_TIMEOUT)
        if new_timeout != saved_timeout:
            self._port.timeout = new_timeout

        try:
            if op is not None:
                self.trace("command op=0x%02x data len=%s wait_response=%d timeout=%.3f data=%s",
                           op, len(data), 1 if wait_response else 0, timeout, HexFormatter(data))
                pkt = struct.pack(b'

read_bytes = port.read(1 if waiting == 0 else waiting)
        if read_bytes == b'':
            waiting_for = "header" if partial_packet is None else "content"
            trace_function("Timed out waiting for packet %s", waiting_for)
            raise FatalError("Timed out waiting for packet %s" % waiting_for)
        trace_function("Read %d bytes: %s", len(read_bytes), HexFormatter(read_bytes))
        for b in read_bytes:
            if type(b) is int:
                b = bytes([b])  # python 2/3 compat

            if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet

if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet
                partial_packet = None
            else:  # normal byte in packet
                partial_packet += b

"""Generator to read SLIP packets from a serial port.
    Yields one full SLIP packet at a time, raises exception on timeout or invalid data.

    Designed to avoid too many calls to serial.read(1), which can bog
    down on slow systems.
    """
    partial_packet = None
    in_escape = False
    while True:
        waiting = port.inWaiting()
        read_bytes = port.read(1 if waiting == 0 else waiting)
        if read_bytes == b'':
            waiting_for = "header" if partial_packet is None else "content"
            trace_function("Timed out waiting for packet %s", waiting_for)
            raise FatalError("Timed out waiting for packet %s" % waiting_for)
        trace_function("Read %d bytes: %s", len(read_bytes), HexFormatter(read_bytes))
        for b in read_bytes:
            if type(b) is int:
                b = bytes([b])  # python 2/3 compat

            if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':

read_bytes = port.read(1 if waiting == 0 else waiting)
        if read_bytes == b'':
            waiting_for = "header" if partial_packet is None else "content"
            trace_function("Timed out waiting for packet %s", waiting_for)
            raise FatalError("Timed out waiting for packet %s" % waiting_for)
        trace_function("Read %d bytes: %s", len(read_bytes), HexFormatter(read_bytes))
        for b in read_bytes:
            if type(b) is int:
                b = bytes([b])  # python 2/3 compat

            if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet

if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet
                partial_packet = None
            else:  # normal byte in packet
                partial_packet += b

trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet
                partial_packet = None
            else:  # normal byte in packet
                partial_packet += b

trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':
                    partial_packet += b'\xdb'
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid SLIP escape (0xdb, 0x%s)' % (hexify(b)))
            elif b == b'\xdb':  # start of escape sequence
                in_escape = True
            elif b == b'\xc0':  # end of packet
                trace_function("Received full packet: %s", HexFormatter(partial_packet))
                yield partial_packet
                partial_packet = None
            else:  # normal byte in packet
                partial_packet += b

"""Generator to read SLIP packets from a serial port.
    Yields one full SLIP packet at a time, raises exception on timeout or invalid data.

    Designed to avoid too many calls to serial.read(1), which can bog
    down on slow systems.
    """
    partial_packet = None
    in_escape = False
    while True:
        waiting = port.inWaiting()
        read_bytes = port.read(1 if waiting == 0 else waiting)
        if read_bytes == b'':
            waiting_for = "header" if partial_packet is None else "content"
            trace_function("Timed out waiting for packet %s", waiting_for)
            raise FatalError("Timed out waiting for packet %s" % waiting_for)
        trace_function("Read %d bytes: %s", len(read_bytes), HexFormatter(read_bytes))
        for b in read_bytes:
            if type(b) is int:
                b = bytes([b])  # python 2/3 compat

            if partial_packet is None:  # waiting for packet header
                if b == b'\xc0':
                    partial_packet = b""
                else:
                    trace_function("Read invalid data: %s", HexFormatter(read_bytes))
                    trace_function("Remaining data in serial buffer: %s", HexFormatter(port.read(port.inWaiting())))
                    raise FatalError('Invalid head of packet (0x%s)' % hexify(b))
            elif in_escape:  # part-way through escape sequence
                in_escape = False
                if b == b'\xdc':
                    partial_packet += b'\xc0'
                elif b == b'\xdd':

def write(self, packet):
        buf = b'\xc0' \
              + (packet.replace(b'\xdb',b'\xdb\xdd').replace(b'\xc0',b'\xdb\xdc')) \
              + b'\xc0'
        self.trace("Write %d bytes: %s", len(buf), HexFormatter(buf))
        self._port.write(buf)