Connection Interval

RE: Connection Interval

saeed mahvis — Tue, 22 Feb 2022 04:30:35 GMT

Yes you are right. For your information I have a custom designed board with nrf5340.

This board is working well with both versions of NCS. It might be the excess hardware

installed on development board which causes this problem. Actually I have no problem

with this issue and I have discussed it just for you information. Thank you very much

for your invaluable guidance.

RE: Connection Interval

Einarh — Mon, 21 Feb 2022 08:55:02 GMT

OK, so to summarize: you are able to change the baud rate, buf size and connection interval successfully when using NCS 1.6.1.

When using NCS 1.8.0, you are able to change the baud rate and buf size, but when you try to change the connection interval your chip restarts repeatedly.

Do I understand your problem correctly?

-Einar

RE: Connection Interval

saeed mahvis — Fri, 18 Feb 2022 17:33:56 GMT

As I explained before I am trying to increase the connection interval of peripheral_uart sample code.I

have made many modifications to this sample to satisfy my application. For example I have changed

the baud rate from 115200 to 9600 and also the UART_BUF_SIZE from 32 to 251 bytes. All of these

changes have been done successfully. The only remained problem is the connection interval.

In my application I should transfer over 240 bytes of data over BLE radio while the UART baud rate

is 9600. The default connection interval window of 35ms to 50ms is not enough for transferring 243

bytes of data by 9600 baud in one burst. So I have to change the connection interval for this purpose.

RE: Connection Interval

Einarh — Fri, 18 Feb 2022 08:49:22 GMT

What program are you seeing this behavior with?

Is it the throughput sample itself or your own custom application?

-Einar

RE: Connection Interval

saeed mahvis — Fri, 18 Feb 2022 05:41:28 GMT

I tried compiling and building the so called program with nRF Connect SDK V1.6.1 and it worked perfectly.

But by compiling and building with nRF Connect SDK V1.8.0 which is a newer version it didn't work and

the chip is resetting repeatedly.

my nRF Connect for desktop version is 3.10.0

RE: Connection Interval

Einarh — Wed, 16 Feb 2022 09:46:48 GMT

From my understanding, the procedure for modifying the connection interval from a peripheral should be the same, but there might be a significant delay before the changes take effect.

Is the param update function returning an error code, or are you just observing that the behavior doesn't change?

I would recommend going through the BLE throughput sample more thoroughly, in case you've missed a step of the procedure.

-Einar

RE: Connection Interval

saeed mahvis — Wed, 16 Feb 2022 07:55:32 GMT

Thank you very much for your information. But I want to increase the Connection interval in peripheral_uart sample code.

Would you please to guide me to modify this program to work with a different Connection interval. I defined the

bt_le_conn_paramm struct at the top and call the bt_conn_le_param_update() function in the main part of program.

It didn't work.

RE: Connection Interval

Einarh — Tue, 15 Feb 2022 09:29:53 GMT

Hello!

The connection interval can be adjusted using Zephyr's Bluetooth API:

https://docs.zephyrproject.org/latest/reference/bluetooth/connection_mgmt.html

To learn how to use this API I would recommend having a look at the BLE throughput sample:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/throughput/README.html

Notice how a bt_le_conn_param struct is defined using the BT_LE_CONN_PARAM() macro, and how that is used in the bt_conn_le_param_update() function to adjust the parameters.

Best regards,

Einar

RE: Connection Interval

saeed mahvis — Sun, 13 Feb 2022 09:59:50 GMT

How can I increase the connection interval of BLE radio from default value of 30mS-50mS to 600ms in NRF5340-SDK.