References
https://pypi.org/project/python-snap7/
https://python-snap7.readthedocs.io/en/latest/installation.html
https://simplyautomationized.blogspot.com/2014/12/raspberry-pi-getting-data-from-s7-1200.html
https://simplyautomationized.blogspot.com/2016/02/python-snap7-s7-1200-simple-example.html
https://simplyautomationized.blogspot.com/2016/02/raspberry-pi-python-snap7-data-blocks.html