I'm having a few connection issue with cosm at the moment, but my primary problem is that your code runs "/etc/init.d/networking restart" which fails to reconfigure the network correctly and leaves the pi unable to connect to the network since eth0 is no longer properly configured. Which is a serious issue in a headless setup.
adding subprocess.Popen(["sudo", "/sbin/dhclient", "eth0"]) after line 140 (the restart call), should fix the problem, and is the only reliable way I have found thus far.
I suspect a static IP would also possibly solve the issue.
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