Pratical exercises made in course of computers network - UFMG
documentation: https://www.overleaf.com/17348440gvxsqpdxfmvv#/65998301/
specification: https://owncloud.dcc.ufmg.br/index.php/s/IyNmZLiujj39bf5#pdfviewer
library select: https://docs.python.org/2/library/select.html
https://www.programcreek.com/python/example/258/select.select