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I found the FAQ to be a good introduction document to the new mesh networking feature. https://www.bluetooth.com/what-is-bluetooth-technology/how-it-works/le-m

• peterwwillis 9y ago
  Thanks for the link. This explains why they would use low power devices with an m:m flood network: "Bluetooth technology implements a managed flood approach in which only main-powered nodes serve as message relays. Low-power nodes, such as battery-powered sensors, are not responsible for message relay." [...] "Bluetooth mesh handles multicast communications using a publish/subscribe group messaging approach. [...] Bluetooth mesh also supports virtual addresses, which extend group addresses by allowing a 128-bit UUID to act as the destination address." They also seem to have added strong security guarantees. So in theory, they could control a large number of sensors using a small number of relays, and have fine-grained, secure control over the low-power devices, and avoid complex routing. It's honestly not a bad idea. Now let's see if they fuck it up like all the other BT implementations.