Increase data speed in NUS nRF52

[Sunil vignesh]

Hey,I've a string of less than 10 bytes (10 characters max) and I'm establishing the connection between the Central (nRF52833-DK) and the Peripheral (nRF52810) and I've set-up the NUS bridge for the data-transfer.The problem is, I've not satisfied with the speed of the data-transfer, can you help me with how I can achieve the maximum speed in NUS? The expectation is under 4ms for this 10 bytes string.Awaiting your response.

[Joakim Jakobsen]

Hi. 

Have you done any measurement on the speed of the transfer? What kind of speed are you seeing?

[Sunil vignesh]

Ah. Not using any speed measurement utility, if there is any of the speed measurement utility is available, kindly let me know I can measure it. But now as visualising it I'm not satisfied with the speed.

[Sunil vignesh]

Hi any update?

[Joakim Jakobsen]

Hi again. 

Hard to say if you can expect higher transfer rate if we don't have information about what you are currently seeing. 

Is it possible that you can measure the transfer speed?

Br, 
Joakim

[Sunil vignesh]

1. Is there any hardware to measure the BLE transfer speed?

2. Does BLE Transfer speed is differ from BLE Services like LBS,NUS or custom services ?

[Sunil vignesh]

Hi any update for previous message

i found this example in devzone

ble_app_uart_throughput_test.zip

static void send_data()
{
    static uint8_t counter;
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];

    uint32_t       err_code;
    uint16_t       length = m_ble_nus_max_data_len;

   
    err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
    if (err_code == NRF_SUCCESS)
    {
         m_tot_num_bytes += length;
         data_array[0]=counter++;
    }

}

for the above lines i got nearly 282KBPS

I changed the lines to my defined one

static void send_data()
{
    static uint8_t counter;
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];

    uint32_t       err_code;
    uint16_t       length = m_ble_nus_max_data_len,length1;
    char str[20];
    length1 = sprintf(str, "%d,%d\n",counter,counter+1);            
    err_code = ble_nus_data_send(&m_nus, str, &length1, m_conn_handle);            
    m_tot_num_bytes += length1;
    counter++;
}

I got 23KBPS

How do I increase the speed of it ?

[Joakim Jakobsen]

Do you have the same connection parameters as the throughput example?

You can read more about the example you tested here:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_att_mtu.html