Use _Me tag to see only your own data
The _Me tag. It is a tag that only contains the logged in user. It can be used to make sure that a user its own data exclusively.
Create a Me Role
Make a copy of the _Operator Role. You manage Roles under Admin > Roles.
Under the _ReadData privilege select the _Me Tag only. All other tags should be unmarked.
The _Me Role should include both _WebLogin and _DeviceLogin. In this way you can create a user that both can have a device, and be able to login to the web interface.
Create a new Me User Type
Create a new User Type called Single User. Make sure it includes both fields for username + password, and a device. Add the _Me Role to this User Type. Also add common Users tag.
When adding new user you should select the Single User User Type.
Map View example
Create a View that contains the _All Tag.
When a Single User logs in this user will only see the users own data generated from the device assigned to the user.
Same View, but different device data in view depending on who is logged in.
Live Event Rule example
Add (or edit existing) Event Rule. In step 2 make sure that the Event Rule is valid for all vehciles. Add an Email Notifier in Step 5. Select Users as receipents of email alerts.
Now, when there is an event only the owner of the device generating the event will receive an email.
Same Event Rule, but different notifications depending on who receives the email notification.
You can create a Role which can see and receive everything by enabling the proper report for this role.