Why does S6B not receive UDP packets?

XBee & XBee Gateway XBee - WiFi
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1

Running the following python 2.7 code to receive UDP packets from the S6B and echo the packet back:

import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind((“”, 9750))

while True:
data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes
print “received message:”, repr(data), addr
sock.sendto(data, addr)

I am receiving data from the S6B:

received message: ‘\x0e \x81\x9d@\x00\x00\x00\x07\x00\x00\x00\x00’ (‘20.10.10.101’, 9750)
received message: ‘\x0e \x81\x9d@\x00\x00\x00\xf017L870\x00\x00’ (‘20.10.10.101’, 9750)
received message: ‘\x0e \x81\x9d@\x00\x00\x00\xf017L870\x00\x00’ (‘20.10.10.101’, 9750)
received message: ‘\x0e \x81\x9d@\x00\x00\x00\x07\x00\x00\x00\x00’ (‘20.10.10.101’, 9750

But the S6B is not giving any output that indicates it is receiving UDP packets. I have tried monitoring the radio but in my embedded environments and in XCTU I have confirmed via wireshark that the packets are being sent to the correct port via wireshark.

Setting file:

XB2B-WF-2026.xml

  4
  2
  2
  almond
  2
  
  0
  0
  64
  258
  3
  devicecloud.digi.com
  20.10.10.254
  255.255.255.255
  0x20
  0x20
  0x20
  0x20
  2616
  2616
  20.10.10.254
  255.255.255.0
  20.10.10.101
  3
  0
  0
  3
  7F3
  2
  2
  1
  0
  0
  0
  0
  1
  0
  1
  1
  1
  1
  0
  0
  1
  1
  7FFF
  7FFF
  0
  0
  0
  0
  28
  0
  0
  1
  0
  7FFF
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  0
  2710
  0
  100
  1F4
  1388
  0
  2B
  64
  3E8

Has anyone had luck receiving UDP packets with the S6B? Am I not supposed to send the packets to the port specified by DE? The manual talks about the XBee application service on port 0xBEE but I am unsure if I have to use that in API escaped mode.

2

What device are you running the Python script from? What happens if you simply put the radio in transparent mode and send the data? (That would be setting AP0).

3

Python is running on linux(debian/ubuntu) and windows(7 and 10) X64 computers. I also tried a program called “hercules setup utility”.

Results have always been consistent:
TCP work great bi-directional
UDP only works S6B to non-S6B

I did try transparent mode with the same results.

Router setup if that matters…
DNS: 20.10.10.254
GW: 20.10.10.254
IP Address Mask: 255.255.255.0

I am wondering if UDP just doesn’t work all that well with these modules and maybe TCP will be the better way to go…