Consider using `automotive_diag` crate for UDS constants

[nyurik]

Hi, would you be interested in collaborating on automotive_diag crate which defines constants for UDS and other standards, and allows both std and no-std usage.

[pd0wm]

I have seen your crate and appreciate the work!

I'm not sure if it makes sense to rely on an external dependency for this due to how rust packaging works. If I want to quickly add/modify one of the constants I need to make a PR and wait for a new release of your crate, as you can't push to crates.io when your package depends on a non-released version of a crate.

I do have a refactor planned with a similar structure like you have with a Standard and Extended version to allow proper typing of non-standard commands (instead of just accepting u8 as an argument like I do now).

What did you have in mind for a collaboration? Are there any direct benefits to the end-user for sharing constants between multiple crates?

[nyurik]

@pd0wm thx for responding! So a few thoughts:

• I usually respond the same day -- e.g. Add support for routine control types. nyurik/automotive_diag#5
• I am more than willing to add more maintainers to my repo -- its a joined effort, so the more ppl work together on this, the better it becomes.
• One authoritative source of all constants that can be used both in vehicle and in diagnostics software seems like a much more maintainable approach -- DRY. Especially considering download/usage stats. Why splinter the community and maintain same info in multiple places?
• For something as serious as a core automotive crate, everyone would want at least one more person reviewing your changes. So on one hand you have "I want to add a new constant to my code and publish it the same day" vs "I need to add a new feature and have at least one more person review it so that community can trust my code changes" -- and if its the later, by the time it is reviewed, a new constant can certainly be published (most of my crates auto-publish from CI)

So I think we would all benefit from one common implementation rather than going the "lone hero" route. I certainly don't want to be the only hero maintaining my stuff :)

[pd0wm]

I'll check what changes would be needed and consider it. Most likely I wont have time till after Black Hat & Defcon.

Two things I'm missing after a quick glance are a way to iterate over commands (I use strum macros for this), and serde support (although I see a branch with some wip code).

[nyurik]

Sure. Could you give an example of how you would use iteration over enum values? Is this for UI display purposes, or something else? Also, I did try serde with it because I saw you were using it, but the expected string here seems a bit strange. Is this the type of serialization you expect?

insta::assert_snapshot!(
  json,
  @r###"{"command":"DiagnosticSessionControl","command_byte":{"Standard":"DiagnosticSessionControl"}}"###
);

[pd0wm]

• Iteration over possible UDS services would be useful for checking the availability of all possible services, same for session types and other sub-function enumerations. E.g. for s in automotive::uds::ServiceIdentifier::iter()
• serde was a request from a (closed source) dependent of this library. They mostly wanted to include SessionTypes and ServiceIdentifiers into another struct that needed to implement Serialize and Deserialize. I wouldn't worry about the exact serialization, as long as it doesn't break Serialize/Deserialize on downstream structs when you include one of the automotive constants it's fine.

[nyurik]

I just released v0.1.8 - should make migration much easier (includes iter & serde & a few other things)