nRF Sniffer V2.0 shows wrong delta times

RE: nRF Sniffer V2.0 shows wrong delta times

twhiting87 — Tue, 05 Mar 2019 09:52:49 GMT

Sorry David, just figured it out (was easier than expected). For anyone that wants to know:

Edit -->Preferences --> Appearance --> Columns

Click on the + and Name the column under title. Change Type to Custom and then put nordic_ble.delta_time under Fields and 0 under Field Occurrence.

RE: nRF Sniffer V2.0 shows wrong delta times

twhiting87 — Tue, 05 Mar 2019 09:23:09 GMT

Hi David, I'm needing to add the delta time (end to start) as a column as you have above, but cannot figure out how you added the metadata as a column. Would you be able to post on here how you did this?

Thanks,

Tom

RE: nRF Sniffer V2.0 shows wrong delta times

JB21 — Wed, 27 Dec 2017 14:41:57 GMT

Thank you, just what I needed. I took me a while to figure out how to configure that.

RE: nRF Sniffer V2.0 shows wrong delta times

David Edwin — Wed, 27 Dec 2017 12:57:43 GMT

The time column is the packet arrival time over the USB interface to the PC and is timestamped on the PC. I would typically expect some differences due to buffering and other jitter on the USB bus and if the PC is loaded more heavily to have more jittering.. The delta time (us end to start) (which you call as metadata) is timestamped in the sniffer so should be more reliable. I typically use the sniffer with the metadata applied as a column. See attached screen shot of my wireshark setting.