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This is the setup we use to connect the sniffer traces listed in Debug Environment.
Wireshark sniffer
Atmel based free wireshark sniffer tool.
ATxMEGA256A + AT86RF233 ZigBit USB Stick (ATZB-X-233-USB)
Link to download the sniffer interface tool: Atmel Gallery Link
Firmware for the sniffer comes along with sniffer interface tool.