Can you say a bit ore about the mesh network features of Briar? I've looked through a lot of the documentation and can't find anything other than references to

Can you say a bit ore about the mesh network features of Briar? I've looked through a lot of the documentation and can't find anything other than references to bluetooth and wi-fi, which is opaque to me. I'm kind of wondering about something like briar, but that can connect over a cjdns network if available... is that what it's doing?