Lost/retransmitted packets report?

[samsam]

Is there any app available that can use to track lost/retransmitted packets and get some log?

I’m trying to find best position for a nRF52840 module with chip antenna without having any expensive equipment to measure signal attenuation based on different position of the antenna regarding the other hardware and human’s fingers / wrist etc. that would be around …

Thanks

[Heidi]

Hi!

Yes, we have a tool called a nRF Sniffer for Bluetooth LE, which will show you real-time display of all BLE packets. To use the nRF Sniffer, you need to have a Nordic device that supports BLE, such as the nRF52840 DK, nRF52 DK, nRF51 DK or the nRF51 Dongle.

Best regards,

Heidi

[samsam]

Hi Heidi,

Could you provide a little more details how could use nRF sniffer to detect lost / retransmitted packages as I cant find such information in the User guide v3.1 for nRF Sniffer for BLE.

I'll use nRF52 DK as sniffer the module that will test has nRF52840 and will have to make some Windows or Android app to exchange some data with nRF52840 for the testing (unless can find something ready :) )

Thanks

[Heidi]

You can tell from the SN (sequence number) and NESN (next expected sequence number) if a packet is retransmitted or lost. 

It's explained pretty well by NovelBits here:

https://www.novelbits.io/understanding-sn-nesn-ble-link-layer-packet/

Best regards,

Heidi