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  • Thank you very much for your tip. I have to use this code on a yocto image, so I have to install some packages; for example I have tested your last example but I can't execute it on my system because I get the error No module named 'dbus'. I hope that in the near future I can install all the necessary packages and modify my code to follow your useful instructions. Thanks again. Commented Oct 10 at 12:38