<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def device_info(self):
 """Information to be pulled into controller info. The latest serial, model, and build_info are included. Additional info can be added via `add_device_info`. """

        info = {
            'serial': self.serial,
            'model': self.model,
            'build_info': self.build_info,
            'user_added_info': self._user_added_device_info
        }
        return info