• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 56 subscribers
  • Views 325 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

the number of RSSI and LQI, for example are different from the number after "save " it and restore it.

Higuchi Nobuhiko
Prodigy 10 points
Other Parts Discussed in Thread: CC2531EMK

PACKET-SNIFFER-2 — SmartRF Packet Sniffer 2

the number of RSSI and LQI, for example  are different from the number after "save " it and restore it.

  • 0
    Prodigy 10 points

    you use packet sniffer and get RSSI number , for example -90, and you save the session.

    and after you restore it, what I see is -70.
    so I wonder which number is the correct one.

    it looks like the number save is the correct one.

  • 0
    TI__Guru**** 219177 points

    Hello Higuchi,

    What CC2X3X device and hardware platform are you using?  Can you share your sniffer log as well as before/after pictures of saving the sniffer session?  Of the values listed, -70 makes more sense given that a typical Zigbee application has a threshold of -80 so I would not expect packets with RSSI as low as -90 to be processed by the sniffer.  You can set up a test using Smart RF Studio to confirm the expected RSSI with a Continuous RX test.  I further recommend reviewing the Zigbee Packet Sniffer FAQ E2E post for updated Zigbee sniffing solutions using Simplelink CC13XX/CC26XX devices.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Guru 735695 points

    You can easily reproduce this issue. Just using CC2531EMK with Packet sniffer to sniff and save log. Before you close packet sniffer, remember the LQI in first packet and restart packet sniffer to open previous saved log to see the LQI in first packet which would be different from what you remembered.

  • 0 in reply to YiKai Chen
    TI__Guru**** 219177 points

    Thanks YK.  Based on my observations, the original LQI values convert to much more realistic RSSI numbers which are also more aligned with the LQI/RSSI readings I am recording using Ubiqua.  This would lead me to believe that the restored values are incorrect.  Unfortunately, Packet Sniffer has not been further developed for several years and there are no TI employees who continue to support this software solution.  This is why I recommend that Ubiqua or a SimpleLink sniffer be used instead.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Guru 735695 points

    Yes, I understand TI no longer maintains packet sniffer and I always use Packet sniffer 2 with wireshark or Ubiqua as Zigbee sniffer. Just help to clarify this issue and don’t expect it to be fixed.