Meshtastic, LoRaWAN and other mesh networks

(Moderator: Please delete if off-topic and not allowed.)

In addition to the Amateur Radio activities that we all know and love, I'm interested in Meshtastic and other low-cost self-organising mesh networks. I understand that remarkable distances can be achieved using low-power devices (often battery-operated in licence-free spectrum (e.g. around 900 MHz) This can either be direct or via multiple hops.

Just wondering if anyone in the Club has knowledge of this topic and played around with these devices?

PS Here are some introductory videos on this subject:

https://www.youtube.com/@RingwayManchester/search?query=meshtastic