BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

Hung Bui — Thu, 03 Sep 2026 13:03:52 GMT

Hi Nikul,

If you have a nRF5 DK you can use it as a sniffer. You don't need extra hardware for that.

As I mentioned, please try to test with a simple BLE application to see if you have good latency.
Also try to adjust your application to send say 20 bytes of data via L2CAP CoC to see if you can achieve the same latency.

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

nikul — Thu, 03 Sep 2026 12:43:08 GMT

I have ordered a BLE sniffer device, and it is currently on the way. In the meantime, could you please review my main.c file and suggest any changes that may help improve the nRF-to-nRF data reception speed and reduce the receiving delay?

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

Hung Bui — Thu, 03 Sep 2026 12:38:59 GMT

Hi Nikul,
We need to have a trace from a sniffer. Please take a look at this guide: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-6-bluetooth-le-sniffer/

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

nikul — Thu, 03 Sep 2026 12:38:59 GMT

I am testing the data reception speed between two nRF devices. One nRF device is transmitting data to the second nRF device, and I want to measure the packet reception interval and identify any delays on the receiving side.

I have provided the related log file and attached the main.c file of the receiving device. Could you please review the logs and the code and help me identify the possible cause of the delay or slow data reception?

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

nikul — Thu, 03 Sep 2026 12:35:27 GMT

devzone.nordicsemi.com/.../NRF_5F00_Sender.txt devzone.nordicsemi.com/.../NRF_5F00_Receiver.txt devzone.nordicsemi.com/.../1667.main.c

RE: BLE L2CAP CoC Reception Delay - nRF54L15 (Android to nRF, 20ms sent / 100-200ms received)

Hung Bui — Thu, 03 Sep 2026 11:57:33 GMT

Hi Nikul,

To be able to get more insight on why you have higher latency with your connection , please try to use a sniffer to capture the communication.

We need to check this irregular, if it's because of interference, or wrong connection configuration or some bottle neck.

I would suggest to try testing with normal BLE communication to see if you have expected latency or not.