I need a RF network that has this : 1) two way communication. 2) Security 3) can work in a 3.5 x 1.5 mile community : with houses, trees, buildings and a park ( https://en.wikipedia.org/wiki/Box_Hill_North,_Victoria). 4) have about 1000 endpoints. 5) low power and low cost would Xbee be better or would Lora ? and why ?