#! /usr/bin/env python3

import opcua
from time import sleep

port = 4840
host = "10.87.2.8"

client = opcua.Client("opc.tcp://{}:{}".format(host, port))
client.connect()
obj = client.get_objects_node()
name_space_index = 2
time_offset = obj.get_child("{}:time_offset".format(name_space_index))
time_offset_R = time_offset.get_child("{}:monitor_point".format(name_space_index))
time_offset_RW = time_offset.get_child("{}:control_point".format(name_space_index))
old_time_offset = time_offset_R.get_value()
target_time_offset = 1
new_time_offset = old_time_offset + target_time_offset
time_offset_RW.set_value(new_time_offset)
sleep(1.0)
latest_time_offset = time_offset_R.get_value()
difference_time_offset = latest_time_offset - old_time_offset
if difference_time_offset != target_time_offset:
    print("ERROR:  Setting and reading back time_offset.  old_time_offset = %d, new_time_offset = %d, latest_time_offset = %d, target_time_offset = %d, difference_time_offset = %d." % (old_time_offset, new_time_offset, latest_time_offset, target_time_offset, difference_time_offset))
else:
    print("SUCCESS:  Setting and reading back time_offset.")
time_offset_RW.set_value(old_time_offset)
client.disconnect()