ukBaz/python-bluezero#30 https://github.com/ukBaz/python-bluezero/blob/master/docs/install_bluez.rst
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=87138#p619713
https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=145364
http://www.esdc.gc.ca/en/foreign_workers/hire/permanent/requirements.page
https://www.coursera.org/learn/embedded-operating-system
include<stdio.h>
int main() { printf("Hello World"); }