"""
So how to change a bool value?

1) Read out the _bytearray your boolean values are in.
2) In this byte_array you need to find the byte (byteindex)
3) Find the bit in this byte (bitindex) so you can
4) set the correct value with utility function set_bool which does all the hard work.
set_bool(_bytearray = data which you read out before.., byte_index, bool_index, value),
5) write back the changed bytearray back to the PLC.

A round trip wil take 5ms.

The example code

https://github.com/gijzelaerr/python-snap7/blob/master/example/

the minimun amount of data being read or written to a plc is 1 byte.
"""

from snap7 import Client
from snap7.util import set_bool, set_int

plc = Client()
plc.connect("192.168.200.24", 0, 3)

# In this example boolean in DB 31 at byte 120 and bit 5 is changed. = 120.5

reading = plc.db_read(31, 120, 1)  # read 1 byte from db 31 staring from byte 120
set_bool(reading, 0, 5, True)  # set a value of fifth bit
plc.db_write(reading, 31, 120, 1)  # write back the bytearray and now the boolean value is changed in the PLC.

# NOTE you could also use the read_area and write_area functions.
# then you can specify an area to read from:
# https://github.com/gijzelaerr/python-snap7/blob/master/snap7/types.py

from snap7.type import Area  # noqa: E402


# play with these functions.
plc.read_area(area=Area.MK, db_number=0, start=20, size=2)

data = bytearray()
set_int(data, 0, 127)
plc.write_area(area=Area.MK, dbnumber=0, start=20, data=data)
# read the client source code!
# and official snap7 documentation