the bluetooth mesh network is a self-build up network by bluetooth node, the nodes in the signal coverage can be found automatically and extend the network range by its signal coverage.
Bluetooth mesh Advantage：
1Quick self set up, join the network when it is powered on, no routing can road caculating need
2Can be acceed by smart phone or controller directly, the gateway is not necessary
3High Security, data is encrypt with LES, Net name + passord security
4Long distance,broadcasting communcation,it can be controled if in the broadcasting coverage.
5Collision detection to avoid network message flooding
6Effective node status update
7Multiple device control,group control support.
