Throughput example

RE: Throughput example

Hung Bui — Thu, 27 Mar 2025 14:09:28 GMT

HI Pallavi,
I strongly suggest you to go through the academy and study more on how BLE communication work.
NUS send timeout could be that the connection has been terminated and the command to queue data has been timed out.
Please step into the code and check where the log is printed.

RE: Throughput example

pal_722 — Wed, 26 Mar 2025 10:29:08 GMT

Hi,

I get "NUS send timeout" at the central side. And no logs in the peripheral side.

The peripheral board stops working, and I do not receive any data.

Does peripheral or central wait for a handshake between data transfers?

RE: Throughput example

Hung Bui — Wed, 26 Mar 2025 09:11:42 GMT

Hi Pallavi,
If you don't provide debug information, it's not possible for me to give you advice just based on "reception is not stable" and the board stop working.

Please check the log to see any info about the assert. Double check if you may have any issue with the data buffer, memory management.

RE: Throughput example

pal_722 — Wed, 26 Mar 2025 06:20:11 GMT

Hi Hung Bui

I edited the ipc_radio file in the NUS sample and saw a great change in reception.
Thank you for that!!
I was able to receive almost the same data rate for the first time, BUT the reception is not stable after multiple trials.
After a point the nrf5340 Audio DK board stops blinking (what i mean is everytime the peripheral UART board is connected to a central UART board, in the peripheral board, green and yellow LEDs blink.)
I am not able to receive any data at the Central side after that.

Can you explain to me why this is happening ?

Regards
Thank you

RE: Throughput example

Hung Bui — Tue, 25 Mar 2025 08:38:56 GMT

Hi,

[quote user="pal_722"]I) In the Sniffer page , it says i need certain boards, which I do not have. Any other way to do that ?
[/quote]

Please get hold of one. It will save you a lot of time debugging.

[quote user="pal_722"]You said about having this particular file in the sample's boards folder , I have added it, am I supposed to put all the configurations such as ATT_MTU, PHY etc be added to that file?[/quote]

Sorry, I was wrong, you should look at the prj.conf in \throughput\sysbuild\ipc_radio. (if you are using SDK v2.8 and above) You should copy the same file in the same folders in your project.

[quote user="pal_722"]In the Throughput sample , the sample output says :
local] sent 1242945 bytes (1213 KB) in 7292 ms at 1363 kbps.
Can you say what 1213KB means? how did 1242945 become 1213KB?[/quote]

It should be 1214kB. One kilo Byte is equal to 1024 bytes.

RE: Throughput example

pal_722 — Mon, 24 Mar 2025 10:25:59 GMT

I) In the Sniffer page , it says i need certain boards, which I do not have. Any other way to do that ?

II)

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/527532"]Note that if you are testing with nRF5340 you need to have a separate configuration for the network core. Please pay attention to the nrf5340dk_nrf5340_cpuapp.conf in boards folder. [/quote]

You said about having this particular file in the sample's boards folder , I have added it, am I supposed to put all the configurations such as ATT_MTU, PHY etc be added to that file?

BUT

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/526597"]I have made a blog here on how to improve throughput , please take a look: Building a Bluetooth application on nRF Connect SDK - Part 3 Optimizing the connection [/quote]

In this you have told to configure the hci_rpmsg to make changes to the network core.

Which one am I supposed to follow? I saw in the fundamentals that child image build system in deprecated in the v2.8.0 SDK. I am currently using v2.8.0.

III) I tried running your project attached in the blog , but I got an error telling RAM overflow. Do you have any updated version of it in with v2.8.0?

IV) Also,

In the Throughput sample , the sample output says :
local] sent 1242945 bytes (1213 KB) in 7292 ms at 1363 kbps.
Can you say what 1213KB means? how did 1242945 become 1213KB?

I am able to observe that with certain changes in the configurations, my application is now able to receive 12750bytes in 13 seconds.

Regards
Thank you

RE: Throughput example

Hung Bui — Fri, 21 Mar 2025 12:10:34 GMT

Hi,

Please check the code and use the sniffer to find:

- connection interval

- Data length extension

- ATT MTU.

- How fast you queue your data

- How you send your data, via notification or indication, via write or write with response.

RE: Throughput example

pal_722 — Thu, 20 Mar 2025 10:57:38 GMT

hi Hung Bui

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/527548"]If you are not so familiar with nRF Connect SDK and Bluetooth Low Energy. My suggestion is to go through our dev Academy here. I would suggest to try going through 2 courses: nRF Connect SDK fundamental and Bluetooth Low Energy fundamental:
https://academy.nordicsemi.com/[/quote]

I have been working with BLE for quite sometime and am aware of things.
I have been trying out a lot many things and have finally reached this stage. From getting no data to actually receiving the data (even at 30seconds). My deadlines are approaching and have been breaking my head into finishing this task.
I do not have the time to go tutorials.
I please request you to help me achieve my required data rate (102kbps).

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/527548"]Please put the file inside a boards folder in your project. Please refer to the throughput project folder.[/quote]

Both the cores are flashed and is working fine.

Regards
Thank you

RE: Throughput example

Hung Bui — Mon, 17 Mar 2025 09:06:03 GMT

Hi Pallavi,
If you are not so familiar with nRF Connect SDK and Bluetooth Low Energy. My suggestion is to go through our dev Academy here. I would suggest to try going through 2 courses: nRF Connect SDK fundamental and Bluetooth Low Energy fundamental:
https://academy.nordicsemi.com/

[quote user="pal_722"]Also, I do not have the nrf5340dk_nrf5340_cpuapp.conf in my sample code folder. How do I add that ?[/quote]

Please put the file inside a boards folder in your project. Please refer to the throughput project folder.

RE: Throughput example

pal_722 — Mon, 17 Mar 2025 08:43:30 GMT

OK.

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/527532"]

Please follow my blog and check:

- connection interval

- Data length extension

- ATTMTU.

- How fast you queue your data

- How you send your data, via notification or indication, via write or write with resposne.

[/quote]

The above mentioned configurations are to be done in the central side?

[quote userid="2121" url="~/f/nordic-q-a/119663/throughput-example/527532"]You can try capture a sniffer trace so that it's easier to debug. [/quote]

I do not have a sniffer board with me right now. Any other way to trace it?

The sample builds to both the Application and Network core in VS Code as shown below.

Also, I do not have the nrf5340dk_nrf5340_cpuapp.conf in my sample code folder. How do I add that ?

Regards
Thank you

RE: Throughput example

Hung Bui — Mon, 17 Mar 2025 08:26:46 GMT

Hi,
12750 bytes in 30 sec seems to be quite low throughput.
If you compare to the result you have with the throughput sample 1363kbps = 170kB/s .
So it's a lot slower than the sample.
Please follow my blog and check:

- connection interval

- Data length extension

- ATTMTU.

- How fast you queue your data

- How you send your data, via notification or indication, via write or write with resposne.

You can try capture a sniffer trace so that it's easier to debug.

Note that if you are testing with nRF5340 you need to have a separate configuration for the network core. Please pay attention to the nrf5340dk_nrf5340_cpuapp.conf in boards folder.

RE: Throughput example

pal_722 — Mon, 17 Mar 2025 07:09:10 GMT

Hey Hung Bui

I tested the sample and, also got to know the configuration settings used in the throughput sample.

[quote userid="135877" url="~/f/nordic-q-a/119663/throughput-example"] I am working with 2 nrf5340 boards(nrf5340 Audio-DK as peripheral and nrf534DK as Central) and am trying to send 12750 bytes of data at one second from Audio-DK to DK using the NUS service.[/quote]

I did some changes to the prj.conf on the peripheral side and observed that I am able to get the required no. of bytes at the central in almost 30 secs.
What change am I supposed to make to receive the data in 1 second? If not 1 second, what shoul I do to decrease the 30 seconds?

Regards
Thank you

RE: Throughput example

Hung Bui — Mon, 10 Mar 2025 15:08:21 GMT

Hi Pallavi,
Have you tried to test with the sample ?
My suggestion is to take a look at the code to see how it works, pay attention to the test_run() function.

The data is sent by using GATT write without response.

I have made a blog here on how to improve throughput , please take a look: Building a Bluetooth application on nRF Connect SDK - Part 3 Optimizing the connection