1. Function Description
1.1 session number is valid for 4h by default
1.2 can obtain the session number through api, which can be obtained once within 4h, instead of once before each use.
2. Operating Instructions
2.1 acquisition method: call login acquisition, and obtain the session through the return value.

2.2 Session Number Permission
- Have the role permissions corresponding to the account
- Authorize the vehicle authority authorized by the corresponding account.
2.3 timeliness description
Valid for 4 hours.
Not calling for more than 4 hours will cause the jsession to fail.
If there are continuous interface calls, the jsession will always be valid.
3. Notes
3.1 The second login of the same account will not invalidate the jsession generated by the first login.
3.2 frequent calls are not recommended