Sending multiple notify packets per connection interval

[Neil_CPD]

Hi,

Device: NRF53

I'm trying to send 3 notify packets in a 15ms connection internal but I can send 2.

I'm using Nrf connect and Zephyr.  is there a limit or a define to set this.

Thank you for any guidance and help

Regards

[Neil_CPD]

Hi,

Sorry for the delay but I been on vacation..

I've spent some time this week trying to re-create the performance that you've managed to find but i've not been able to. I tried with the central and also on my phone but no success. 

I've attached your projects with my build folders in.  If you could please verify on a nrf5340-dk that would be great.

I've also looked at the log for the rpmsg and the messages seem to also be groups of two.3264.hr_mp_NC.zip

nc_hr_mp_test.pcapng

[ovrebekk]

Hi 

Hung is on leave, and I will help you out in the mean time. 

Normally issues with throughput on the nRF53 are caused by not configuring the hci_rpmsg application running on the network core properly. 

If you take a look at the throughput example in the nrf repository you can see that they define a separate config file for this application, in a folder called child_image:
https://github.com/nrfconnect/sdk-nrf/tree/master/samples/bluetooth/throughput/child_image

Can you try something similar for your project and see if it improves the number of notifications you can achieve?

Best regards
Torbjørn

[Neil_CPD]

Thanks for the reply,  I've checked  the "nrf connect SDK project.." in hci_rpmsg_menuconfig and they seem to be correct,  If there a good way to verify that the values have been built into the project?

if I add the child image folder do I need to regenerate the project in nrf Connect?

Thanks

Neil

[ovrebekk]

Hi Neil

Neil_CPD said:

If there a good way to verify that the values have been built into the project?

If you open your build folder, and navigate to the subfolder \hci_rpmsg\zephyr, there should be a file called .config which contains all the pre-compiled configuration settings:

In this file you can search for the config parameter you are interested in (such as CONFIG_BT_CTLR_RX_BUFFERS), and verify that it is set as you expect. 

Neil_CPD said:

if I add the child image folder do I need to regenerate the project in nrf Connect?

Yes. This is not picked up by the build automatically, and you need to re-run cmake in order for these settings to be included. 

You can do this from the command line by running west build with the -c parameter:

west build -c

If you use Segger Embedded Studio there is a menu option to rerun cmake:

Menu -> Project -> Run CMake...

Best regards
Torbjørn

[Neil_CPD]

Hi Torbjørn,

Thank you for the advice.  I can see all the config values that Hung has set in the project that he has attached but this hasn't made any difference I still only get 2 notify packets per connection.

Do you have a nrf5340-dk that you could test with and attach the build folder so I could program the hex as a test please?

Or if you have any other suggestions to try next that would be great.

Thank you.

Neil