Description

This PR adds a new PID containing a UUID of the machine/host. It is used to check if the metadata of other participants comes from the same host in a more reliable approach than the GUID comparison, which uses IP addresses interfaces.

This feature solves a bug in which a TCP client connecting to localhost is unable to identify the locator of a TCP discovery server with a custom GUID listening on any. This causes the client to create two different channels for the same connection, where the latest can never be reached. The reason is that the server's locator is not considered from the same host due to its custom GUID. Hence, the server transforms the client's locator into localhost but the client does not do the same with the server's locator.

Another PR needs to be created for 3.2.x with the new PID properly added to ParameterTypes.hpp. That PR will not be backported.

@Mergifyio backport 3.0.x 2.14.x 2.10.x

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally. Related test: [22056] Transform locators using new host_id PID Discovery-Server#106
• Any new/modified methods have been properly documented using Doxygen.
• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• Changes are API compatible.
• New feature has been added to the versions.md file (if applicable).
• New feature has been documented/Current behavior is correctly described in the documentation.
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.