Ignition: Migrate to a newer version

[francocipollone]

Context

• Moving to a newer version:

  • Main motivation: Allows us to get the built-in Plotting plugin Plot plugin #456

  • Is effortless as there aren't breaking changes in the API.

• Ignition Releases

Moving to Fortress seems to be the way to go.

More

• Edifice(ign-gui5): can be installed via rosdep(even though actually is officially targeted to Galactic, we can install it because it is available in focal).
• Fortress (ign-gui6):
  • Release at 9/30/2021
  • Via rosdep: It will be officially targeted to Rolling, as with Edifice, I expect we can still it from focal/foxy.

I have already tried:

• delphyne + Edifice: Easy migration. Installed via rosdep.
• delphyne + Fortress: Easy migration. Installed via apt.

[francocipollone]

So the thing is that Fortress(ign-gui6 + deps) won't be available to be installed via rosdep right away, several days could pass until we get it (I didn't get a better estimation).

Having in mind that migrating to Edifice is simple, and from Edifice to Fortress is also effortless probably doing a stopover in Edifice isn't that bad. Also thinking about:

• visualizer: QtQml.Models is missing #468
• Plot plugin #456

That they are two issues that could be solved by just migrating to a newer release.

[francocipollone]

I've found an issue with Edifice.

• ign-gui5(Edifice) when installed via rosdep: ignition-gui5.0.0
• ign-gui5(Edifice) when installed via apt: ignition-gui5.2.0

A hot-fix in the Grid3D was added at ignition-gui5.1.0 that was causing an immediate crash. We are using that plugin in the visualizer and that crash is reproducible with our visualizer.(Given that we are installing via rosdep and that brings 5.0.0)

[francocipollone]

After F2F chat with @agalbachicar it was decided to keep using citadel version as it is the official version for foxy ros-version.
That way, if downstream users would like to integrate it with ros, they would be able to do so in a straightforward manner.
See https://github.com/ignitionrobotics/ros_ign