Electronic control unit and non-transitory computer readable medium storing session establishment program

1. An electronic control unit that is installed in a vehicle capable of communicating with a tool outside the vehicle by wire and capable of wirelessly communicating with a server outside the vehicle, and that updates a program stored in a memory of the electronic control unit itself, the electronic control unit comprising:

a processor and memory configured to implement an application execution portion that

has, as a state, a default session, a diagnosis session for diagnosing the electronic control unit from an outside of the vehicle via wired connection or wireless connection, a wired rewrite session for rewriting the electronic control unit with use of a program acquired from the outside of the vehicle via the wired connection, and a wireless rewrite session for rewriting the electronic control unit with use of a program acquired from the outside of the vehicle via the wireless connection,

is configured to:

upon receiving a request indicating a wired diagnosis or a wireless diagnosis, cause the state to transition to the diagnosis session and execute the request indicating the wired diagnosis or the wireless diagnosis while maintaining the diagnosis session, and upon transitioning to any session other than the diagnosis session, terminate execution of the request indicating the wired diagnosis or the wireless diagnosis with a state transition to any session other than the diagnosis session;

upon receiving a request indicating a wired rewrite, cause the state to transition to the wired rewrite session and execute the request indicating the wired rewrite, and upon transitioning to any session other than the wired rewrite session, terminate execution of the request indicating the wired rewrite with a state transition to any session other than the wired rewrite session, and

upon receiving a request indicating a wireless rewrite, cause the state to transition to the wireless rewrite session and execute the request indicating the wireless rewrite, and upon transitioning to any session other than the wireless rewrite session, terminate execution of the request indicating the wireless rewrite session with a state transition to any session other than the wireless rewrite,

wherein:

the application execution portion is configured to exclusively establish the wired rewrite session and the wireless rewrite session.

2. The electronic control unit according to claim 1 , wherein:

the application execution portion is configured to exclusively establish the wired rewrite session with priority over the wireless rewrite session.

3. The electronic control unit according to claim 1 , wherein:

the application execution portion is configured to exclusively establish the wireless rewrite session with priority over the wired rewrite session.

4. The electronic control unit according to claim 1 , wherein:

the application execution portion is configured to exclusively establish a shifting rewrite session with priority among the wired rewrite session and the wireless rewrite session.

5. A non-transitory computer readable medium storing a session establishment program comprising instructions configured to, when executed by a processor of an electronic control unit that

is installed in a vehicle capable of communicating with a gool outside the vehicle by wire and capable of wirelessly communicating with a server outside the vehicle, and that updates a program stored in a memory of the electronic control unit itself,

has, as a state, a default session, a diagnosis session for diagnosing the electronic control unit from an outside of the vehicle via wired connection or wireless connection, a wired rewrite session for rewriting the electronic control unit with use of a program acquired from the outside of the vehicle via the wired connection, and a wireless rewrite session for rewriting the electronic control unit with use of a program acquired from the outside of the vehicle via the wireless connection, and

is configured to

upon receiving a request indicating a wired diagnosis or a wireless diagnosis, cause the state to transition to the diagnosis session and execute the request indicating the wired diagnosis or the wireless diagnosis while maintaining the diagnosis session, and upon transitioning to any session other than the diagnosis session, terminate execution of the request indicating the wired diagnosis or the wireless diagnosis with a state transition to any session other than the diagnosis session;

upon receiving a request indicating a wired rewrite, cause the state to transition to the wired rewrite session and execute the request indicating the wired rewrite, and upon transitioning to any session other than the wired rewrite session, terminate execution of the request indicating the wired rewrite with a state transition to any session other than the wired rewrite session, and

upon receiving a request indicating a wireless rewrite, cause the state to transition to the wireless rewrite session, and execute the request indicating the wireless rewrite, and upon transitioning to any session other than the wireless rewrite session, terminate execution of the request indicating the wireless rewrite session with a state transition to any session other than the wireless rewrite,

wherein:

the processor executes a session establishment procedure that exclusively establishes the wired rewrite session and the wireless rewrite session.

6. The electronic control unit according to claim 1 , wherein

the default session is a session to be transitioned from the diagnosis session, the wired rewrite session and the wireless rewrite session due to a timeout, and

the application execution portion makes a session maintenance request to maintain the diagnosis session, the wired rewrite session or the wireless rewrite session.

7. The electronic control unit according to claim 1 , wherein

the state is one state, and

the application execution portion exclusively establishes the wired rewrite session or the wireless rewrite session by establishing only one of the default session, the diagnosis session, the wired rewrite session and the wireless rewrite session.

8. The electronic control unit according to claim 1 , wherein

the memory has a plurality of application regions,

the state is one state,

in the default session, a vehicle control program is executed, and

the application execution portion continues to execute the vehicle control program after the state is transitioned to the diagnosis session or the wireless rewrite session.