Add support for R-GOOSE messages

[pjungkamp]

TODO

• R-GOOSE Receiver
• R-GOOSE Publisher

[pjungkamp]

@stv0g Would you be ok with the libiec61850 and lib60870 fixups for mbedtls support being in the default overlay until I manage to get these into nixpkgs?

[stv0g]

@stv0g Would you be ok with the libiec61850 and lib60870 fixups for mbedtls support being in the default overlay until I manage to get these into nixpkgs?

Yes please 🙏🏻 I would favor velocity in this case, instead of beeing blocked by Nixpkgs maintainers.

[n-eiling]

I am curious: Why are you adding noexcept(false) to functions?

[pjungkamp]

I am curious: Why are you adding noexcept(false) to functions?

I prefer to use noexcept as a default for functions, but when I know that a function might throw, indicate that using nexcept(false). This should indicate to others that this function can throw and will need to be handled accordingly. Functions across VILLASnode aren't consistently annotated with noexcept, which means that I often find myself looking into the function definition to check whether a function might throw or not. noexcept(false) shows to the reader of the code that this function might throw and has been written with exception safety in mind.

[pjungkamp]

@stv0g I consider this PR ready. Could you do another review? I think the failing pkg:docker: [debian, linux/arm64/v8, arm64, aarch64-linux-gnu, pi5] pipeline is not caused by this PR but rather by some broken cached state in the debian image on the Pi5.

[stv0g]

Looks, good. Only some minor comments..

[pjungkamp]

@stv0g I consider this PR ready. Could you do another review? I think the failing pkg:docker: [debian, linux/arm64/v8, arm64, aarch64-linux-gnu, pi5] pipeline is not caused by this PR but rather by some broken cached state in the debian image on the Pi5.

@windrad6 just managed to fix it. The Pi 5 was out of storage and "Invalid GPG key" is surely an interesting way to communicate that. The problem was the lack of garbage collection of the Docker build cache. We've now pruned the cache and set up automatic garbage collection to prevent this in the future.