Migrate from https://cmakerhk.wordpress.com/2018/09/30/offline-mesh-network/
https://www.youtube.com/watch?v=i5aJAzZobBQ
Gotoky: bluetooth device which allow us to communcation though a long distance without cellular signals.
Firechat, use Smartphone WIFI and BLUETOOTH –> the range is only 30 step
BluCat: https://www.youtube.com/watch?v=39fNxtTJtis
https://www.opengarden.com/firechat/
https://play.google.com/store/apps/details?id=com.bsb.hike&hl=en
HIKE, Bridgefy, firechat
Multipeer Connectivity Framework: Similar tech
https://www.gotoky.com/