Download xbee document from links follows:
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XBee/XBee-PRO 802.15.4 Professional Kit Getting Started Guide, look at page 16 (Point-to-Multipoint Addressing)
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Product Manual: XBee / XBee-PRO 802.15.4 RF Modules, look at page 28 (Broadcast Mode)
Point‐to‐multipoint topologies require one base module to be configured to operate in Broadcast mode (DL= 0xFFFF). This allows the module to broadcast messages to all devices in the network.
Configuration for 1 Base(Server) and 5 Remote(End Devices/Client) as follows: (look at document 1 above for details)
Base(Server) config:
DH =0, DL=0xFFFF, MY=0
Remote1(Client1) config:
DH =0, DL=0, MY=1
Remote2(Client2) config:
DH =0, DL=0, MY=2
Remote3(Client3) config:
DH =0, DL=0, MY=3
Remote4(Client4) config:
DH =0, DL=0, MY=4
Remote5(Client5) config:
DH =0, DL=0, MY=5
Note:
DH (Destination Address High)
DL (Destination Address Low)
MY (16-bit Source Address)