factory reset

def reset(self):
        """factory reset"""
        print '%s call reset' % self.port
        try:
            if self._is_net:
                self.__sendCommand(WPANCTL_CMD + 'leave')
            else:
                self._sendline(WPANCTL_CMD + 'leave')

            self.__sendCommand(WPANCTL_CMD + 'dataset erase')
            time.sleep(2)
            if not self._is_net:
                self._read()
        except Exception, e:
            ModuleHelper.WriteIntoDebugLogger('reset() Error: ' + str(e))