Delay between notification value and logged value, nRF Connect

[Mahmoud Masmoudi]

I use nRF Connect to debug some latency in logging data on my Android app.

On nRF Connect, the latency for the notification value (in the characteristic itself) is negligible.

Strangely, when I open the nRF Connect log, I see noticeable delay in logging the same value. What is the reason behind this ?

[Jared]

Hi,

The reason for the delay is that the nRF Connect when notified collects the logs in memory with timestamp and then only flush the logger every +second, even if notifications comes more often. This is to avoid being unusable when the notifications come too often. But the timestamps should be the same even though there is delay.

Best regards

Jared 

[Mahmoud Masmoudi]

Thank you for your answer.
At first, I had the same problem in an app that I've developed, where I noticed some latency in the reception of onCharacteristicChanged callback (when I get characteristic notifications). So, I thought it could the same thing for the nRF Connect log.
It is strange that I get latency in notifications in my app though ..