gateway CPX4 et 5 XBee Pro S2

السلام عليكم و رحمة الله

I have build my ZigBee networks containing 5 XBee Pro S2 as Router and one gateway CPX4 as Coordinator.

I choose the star topology because each xbee module will send a temperature value to the server through the gateway.
These XBee modules receive nothing from gateway.(modules---->gateway).

It's the best choice or not ?if you can give me suggesions?

--->In the gateway:

            *PAN ID: 0x4a59
            *channel: 0xc
            *scan all channels

---->In router XBee Pro 2:

           *PAN ID: 4a59
           *channel scan: 16
           *DH, DL destination: 0

in script python

With this code i can find my network XBee the two modules and the gateway :

nodes = zigbee.getnodelist()
print 'Starting up...'
# Print the table:
print "%12s %12s %8s %24s" % \
    ("Label", "Type", "Short", "Extended")
print "%12s %12s %8s %24s" % \
    ("-" * 12, "-" * 12, "-" * 8, "-" * 24)
 
for node in nodes:
  print "%12s %12s %8s %12s" % \
        (node.label, node.type, \
            node.addr_short, node.addr_extended)

I can implemented the protocol CSMA / CD (Carrier Sense Multiple Access / Collision Detection): the module xbee sent these doonnes when the channel is available?
How do I get the data from the 5 XBee?

from socket import *

 # Create the socket, datagram mode, proprietary transport:
sd = socket(AF_XBEE, SOCK_DGRAM, XBS_PROT_TRANSPORT) 
 
# Bind to endpoint 0xe8 (232) for ZB/DigiMesh, but 0x00 for 802.15.4
sd.bind(("", 0, 0, 0))
sd.settimeout(1)
 
# Block until a single frame is received, up to 255 bytes:

print "Waitting For New Packet"
#sd.recvfrom(packetSize)
payload, src_addr = sd.recvfrom(255) 

print "payload"
print payload

gateway CPX4 et 5 XBee Pro S2

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