TLS certificates and system date/time

When trying to setup a Beaglebone client in a production setting, with a valid ssl certificate it became apparent that devices like the beaglebone don't have a real time clock, and the default date/time is set to the build time of the image.

This means:

you have to set the time correctly every time you boot your device, or SSL won't work.

Acceptance criteria:

• Set poll interval in demo layer to 30 seconds