How to measure BLE lantency?

[Ziyao Zhou]

Hi

I want to know if I send a data from peripheral, how many time the central device could receive. Some people said that I could use the sniffer to caputure the interval between Sending packet and Receiving Packet. However, I cannot caputure the connection packet in my wireshark:

My question is:

1. How could I capture the connection packet using a sniffer? 

2. I noticed nRF Connect gives latency (23.82ms). Could this be the right number I wanted? What is the relationship between 23.82 ms and the other 0.22 0.52 48.66ms?

3. I want to know which parameters will affect the latency? I understand that smaller connection interval could have lower latency. However, whethe the distance, transmisson power, physical layer,RSSI affect latency?

Thank you so much for your clarify！

[Hung Bui]

Hi Zhou, 

I would suggest you to take a look at our Dev Academy course here: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-6-bluetooth-le-sniffer/

It will show you how to to capture the communication when in connection. 

[Ziyao Zhou]

Hi,

What is the relationship between this "0.22,0.52,48.66,21.03" and 23.82 ms. I still cannot find relative information in the academy

Thank you!

[Hung Bui]

Hi, 
Please show the full screenshot. If you need to go multiple steps to get there, please take screenshot at each step. 
I'm not so sure what the app's measuring here. Most likely it's the distance between advertising packets. 

[Ziyao Zhou]

Hi

I am using nRF connect

[Hung Bui]

Hi Zhou Ziyao, 

It's in advertising mode, not connected , correct ? 
I talked to the developer of the app and it could be a bug. 
So for measuring the distance between advertising packet, please use the sniffer. 
What exactly you want to measure ? interval between 2 advertising packet or interval between two connection event when in connection ?