Add power signal; somewhat limited

[elffjs]

For Teslas, we have this field charger.power:

{
  …
  "data": {
    …
    "charger": {
      "power": 28
    }
  }
}

In kilowatts. This is only populated during charging. Looking at VSS, the best match seems to be Powertrain.TractionBattery.CurrentPower. Two weird things:

• It's supposed to be populated all the time, with negative values when the vehicle is consuming power while driving. We don't have those drive consumption values. We can look and see if we can get it—this won't help with historical payloads.
• It's in watts, so we must multiply the historical stuff by 1000.

[linear]

SI-2688 Translate charging power to telemetry

[elffjs]

@KevinJoiner What command should I be running here? I copied the README and got

% go run github.com/DIMO-Network/model-garage/cmd/codegen -output=pkg/vss  -generators=all
2024/05/28 12:45:09 failed to generate custom file: error parsing Custom file template: open : no such file or directory
exit status 1

[elffjs]

I think one does want to add -package vss there. Same error though.

[elffjs]

I see, it's because all implies custom. This is if you want to execute some non-standard template?

It seems like go run github.com/DIMO-Network/model-garage/cmd/codegen -output=pkg/vss -package vss -generators=model,convert is good enough, then.

[Allyson-English]

do we want to take this opportunity to also populate powertrainTractionBatteryChargingIsCharging if we're seeing a positive value here?

[elffjs]

I worry that cross-talk between the fields will not fit into the code generation. I haven’t tried to verify this suspicion.

[KevinJoiner]

The codegen should handle multiple signals being populated from the same data point

[elffjs]

Speaking lazily: we only get this for Tesla, and we're for sure populating charging for those.

[KevinJoiner]

make generate will generate the code for this repo I can update the readme with make help.

[KevinJoiner]

The codegen should handle multiple signals being populated from the same data point