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Throughput example

pal_722

Hey!
 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.

I was going through the Throughput example sample output and it shows, the server was able to send data at 1363kbps.


What were the configuration settings made to achieve this data rate?


What does "[peer] received 1242945 bytes (1213 KB) in 2511 GATT writes at 1415583 bps" mean ? Does it mean 495 bytes of data was sent 2511 times ?

For me to achieve my desirable data rate, ie 102Kbps, what change in settings am I supposed to do? Does increasing UART_BUF_SIZE help me achieve it?


Can you please help me out ?Your response will be of great help.

Regards
Thank you 

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  • 0

    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 

  • 0 in reply to Hung Bui

    Hey  

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

    pal_722 said:
     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.

    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

  • 0 in reply to pal_722

    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/

    pal_722 said:
    Also, I do not have the nrf5340dk_nrf5340_cpuapp.conf in my sample code folder. How do I add that ?

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

  • 0 in reply to Hung Bui

    hi  


    Hung Bui said:
    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/

    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).

    Hung Bui said:
    Please put the file inside a boards folder in your project. Please refer to the throughput project folder.

    Both the cores are flashed and is working fine.


    Regards
    Thank you

  • 0 in reply to pal_722

    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. 

  • 0 in reply to Hung Bui

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

    II)

    Hung Bui said:
    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. 

    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

    Hung Bui said:
    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 

    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

  • 0 in reply to pal_722

    Hi, 

    pal_722 said:
    I) In  the Sniffer page , it says i need certain boards, which I do not have. Any other way to do that ?

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

    pal_722 said:
    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?

    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. 

    pal_722 said:
    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?

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

Reply
  • 0 in reply to pal_722

    Hi, 

    pal_722 said:
    I) In  the Sniffer page , it says i need certain boards, which I do not have. Any other way to do that ?

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

    pal_722 said:
    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?

    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. 

    pal_722 said:
    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?

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

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