Lora network without Lora Gateway.

[MrNams]

As shown in image,

Q1) Is it possible to broadcast message from Lora Node S to all Lora Nodes A,B,C, D and E?
Q2) Can Loara Node S be programmed to act as server to receive data from all other nodes?

Each of Lora Node has sensor whose data will be sent to Lora Node S, then Lora Node S process data from Arduino and send back command to all Nodes to operate relay.

I want design small system without Lora Gateway and it will work offline, Lora Node S control all other Nodes and also Receive Data from them.