Communication device and method for communication between two control devices in a vehicle

A communication device for a vehicle, comprising:

• a memory;
• and
• a processor coupled to the memory, the processor being configured to:
• generate a first address, based on a random number that is set in advance in accordance with a current time, for a time that a first control device configured to control the vehicle communicates with a second control device;
• communicate with the second control device via the first address, and receive information that specifies the first control device from the second control device;
• and
• set a second address in place of the first address based on the received information, the second address corresponding to an instrument that the first control device controls.

A communication method comprising, by a processor:

• generating a first address, based on a lot number that is assigned in conjunction with manufacture of a first control device configured to control a vehicle, for a time when the first control device communicates with a second control device;
• communicating with the second control device via the first address, and receiving information that specifies the first control device from the second control device;
• and
• setting a second address in place of the first address based on the received information, the second address corresponding to an instrument that the first control device controls.