#zigbee directional repeater
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The smlight dongles have an alternative firmware you can flash them with to set them up as a zigbee router (i.e. what you'd refer to as "repeater" in other networking standards) https://smlight.tech/product/slzb-06/
and with the pretty beefy antenna, a single one of them is probably enough to reach sufficiently many devices on the other side to properly bridge a 20m gap
Unfortunately, I also have no direct connection to my HA server. It's 2 rooms away. Laying a cable is impossible
You don't need a cable between the HA server and the smlight dongle (that is, once you flashed the dongle with the router firmware). The RJ45 and USB port are mainly used in coordinator mode. In router mode, you only need (one of) them to power the dongle, but they don't need a wired connection to the HA server to work
(i.e. most likely, you'll just use some USB wall plug to power the dongle via the USB port)
... that being said, a whole different option would be to build up the second "building" (or whatever the 20m separate) as a separate zigbee mesh. If the buildings are already connected somehow LAN-wise, you can use the smlight dongle as a second coordinator that doesn't have to be directly wired to the HA server, only reachable via LAN somehow
Almost any mains powered device will do the job - a lightbulb or smart plug is probably the cheapest and easiest option because you can just plug one in halfway and job done
True, my assumption was that the 20m are essentially "hostile territory"... like a road between two buildings or something. Maybe with two additional thick walls further inhibiting signal propagation; so there are already router (mains powered) devices on the edges of the gap, but nothing powerful enough to properly bridge it, and putting something in the middle of the gap isn't an option