Return True is the AMP should be updated:
        - AMP is enable
        - only update every 'refresh' seconds

def should_update(self):
        """Return True is the AMP should be updated:
        - AMP is enable
        - only update every 'refresh' seconds
        """
        if self.timer.finished():
            self.timer.set(self.refresh())
            self.timer.reset()
            return self.enable()
        return False