So, in a random forum post about beacons, the dev said something like "they're used for robots that need to move around a lot like if they build blueprints. So, how do I get bots to deliver stuff to my blueprints? Is it even possible?
Here is an example of how this can be done. This Bot will add Stones to the Blueprint that needs Stones that is the nearest to the Beacon that is set by the blue and red icon. The Farmer-Player can then move that Beacon to wherever you want and the Bot will then walk towards that Beacon, find the nearest Blueprint, and add the Stones to it.