In Drupal\wayfinding_digital_signage\EventSubscriber\Wayfinding::onOverlays() the link to wayfinding gets embedded. Problem being, that remote devices may cache that content indefinitely, and we have no means to reset that remote cache.
Therefore, we need a mechanism to reset the cache by modifying the link, e.g. by adding ?s=someHASH to the URL. When that changes, the remote browser would see a different link and therefore load the content from the source and not from its cache any longer.
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