Communication device and control device

A control device configured to be notified of information from an external communication device, the control device comprising:

• a communication circuitry configured to perform data communication with the communication device;
• and
• a control circuitry configured to control an operation to receive notification data from the communication device via the communication circuitry in response to an event indicating that a state in the communication device changes, wherein
• the notification data includes an event identification region to identify a target event to be notified, a data storage region to store state data indicating a state changed in the target event, and a necessity identification region to indicate whether the control device requires acquiring additional information regarding the target event, and wherein
• when receiving, from the communication device via the communication circuitry, the notification data with the necessity identification region indicating that the control device requires acquiring the additional information, the control circuitry requests the additional information from the communication device, and
• when receiving, via the communication circuitry, the notification data with the necessity identification region indicating that the control device does not require acquiring the additional information, the control circuitry does not request the additional information from the communication device.