Nordic Thingy 53 time synchronization

RE: Nordic Thingy 53 time synchronization

Mathias0 — Tue, 03 Feb 2026 06:42:22 GMT

Finally, I found one of the biggest issues: an error in my calculations. The final calculation is below. Still, there is an error of around 60 ms, i.e., the difference of the reference times are 180 ms but the difference in receiving is only 120 ms. using 7.5 ms connection interval.

long dif_ref = time_sync.second_time_ref - time_sync.first_time_ref;

long dif_loc = time_sync.second_time_local - time_sync.first_time_local;

long trans_time = dif_loc - dif_ref;

time_sync.time_offset = time_sync.first_time_ref -

time_sync.first_time_local + trans_time;

RE: Nordic Thingy 53 time synchronization

Mathias0 — Mon, 02 Feb 2026 11:00:48 GMT

After working on it more in depth, I can now provide some more information. The Interval time is set to 7.5 ms. Furthermore, the current state is logged via UART regularly. What I see is in the logs is a time gap of 200ms after some seconds. Normally, the state is reported all 50 ms. It looks like the processor is busy some times...

RE: Nordic Thingy 53 time synchronization

Mathias0 — Mon, 26 Jan 2026 12:07:23 GMT

Thank you for the question. To be honest, I have not adjusted it. Hence, I guess it's taking some default value. I could not find a default value in the documentation of Nordic. However, it is stated that the interval is set from the central, e.g., the computer connecting to the Thingy (https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-3-bluetooth-le-connections/topic/connection-parameters/).

However, from the two libraries i tried, neither bleak (https://bleak.readthedocs.io/en/latest/api/client.html) nor a plugin for C# (https://github.com/dotnet-bluetooth-le/dotnet-bluetooth-le) allow to set the connection interval. Would it be necessary to set it in the Thingy?

RE: Nordic Thingy 53 time synchronization

Sigurd — Fri, 23 Jan 2026 14:29:02 GMT

Hi!

What is the connection interval you are using?