Vehicle Signal Specification

Colleagues:

We have been discussion the Vehicle Signal Specification (VSS) as the basis
for the data structure for our new web services approach to provide access
to vehicle data and allow control of various vehicle functions from a
managed runtime, web runtime, and/or web browser:

[image: Inline image 1]
(The slide is from a deck I presented at the Future Connected Cars
Conference in Santa Clara last week.)

We have now published the first iteration of the VSS on GitHub [1] for
review and commenting. The specification is modeled after actual signals
from CAN bus databases used by JLR. The current iteration contains about
180 signals which we expect will grow to about 500 signals with the coming
iterations.

You can easily see that because of the sheer number of signals and
controls, a dynamic approach for the API based on services and JSON data
structures makes very much sense.

The hierarchical approach with signal paths also naturally lends to
grouping of signals which is important for subscription.

For example a door has multiple signals:

   - body.door.0.left.locked
   - body.door.0.left.open
   - body.door.0.left.child_lock
   - body.door.0.left.window_position
   - body.door.0.left.curtain_position

You can now group signals using wildcards:

   - body.door.0.left.*       (all signals of the left door of the first
   row)
   - body.door.0.*            (all signals of all doors of the first row)
   - body.door.*              (all signals for all doors)
   - body.*                   (all body signals)

And equally using "in between" wildcards:

   - body.door.0.*.open       (open status of all doors in the first row)
   - body.door.*.left.open    (open status of all doors on the left side of
   the vehicle)
   - body.door.*.*.open       (open status of all doors on all sides of the
   vehicle)
   - body.*.*.*.open          (open status of anything that provides it
   e.g. doors, hood, trunk, moon roof, filler cap, ...)


We invite your feedback and consideration.

Best regards,
:rjs

[1] https://github.com/GENIVI/vehicle_signal_specification


-- 
*Rudolf J Streif*
System Architect - Open Source Initiative
Open Source Technology Centre

*M:* +1.619.631.5383
*Email:*  rstreif@jaguarlandrover.com



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