Acceptance criteria:

• Implement a new DBus endpoint:

  • Connection name: io.mender.UpdateManager

  • Object path: /io/mender/UpdateManager

  • Interface: io.mender.Update1

  • Method name: SetUpdateControlMap

  • Parameters:

    • update_control_map (string): JSON data (exact format described in MEN-4546, but assume it has id and priority keys)

  • Returns:

    • refresh_timeout (int): Seconds before the request should be refreshed. This should be UpdateControlMapExpirationTimeSeconds / 2.

• Endpoint must be served from a new Go routine separate from the main thread. This is to keep responsiveness even during an update.

  • Do not reuse the Auth Go routine, we may split this into a separate binary later, so the code should not be mixed.

• The id and priority fields together form the primary key for the map. All maps with unique keys are stored, but identical keys overwrite each other. For example:

• All accesses to read and write the maps must be thread safe (mutex probably).

• The client facing API should be SetMapValue (or similar name)

• Unit tests

• Feature branch: feature-dbus_update_control