large data send central to peripheral nrf52832

[Autobot]

Hello everyone,

I need transfer large data 12KB array send central to peripheral using nrf52832. I try this examples in central (ble_app_uart_c) and peripheral (ble_app_uart). I add this few line in central

for(;;){

            uint16_t cnt=0;
           for(cnt=0;cnt<12000;cnt++)

            {
                uint8_t data=array_data[cnt];
            ble_nus_c_string_send(&m_ble_nus_c, &data, sizeof(data));
            
            }      
            
            idle_state_handle();
        }

peripheral doesn't receive any data from central. any example function or code is there to communicate central and peripheral transfer large data....????

[awneil]

You're not checking the return result from ble_nus_c_string_send()

How to properly post source code:

[Jørgen Holmefjord]

Like awneil said, you need to check the return code from call to ble_nus_c_string_send(). Most likely you fill up the notification buffer with the first data that is being received on peripheral side. Since you do not check return code, the rest of the data is lost.

uint8_t data=array_data[cnt];
ret_code_t err_code;
do
{
    err_code = ble_nus_c_string_send(&m_ble_nus_c, &data, sizeof(data));
} while (err_code == NRF_ERROR_BUSY || err_code == NRF_ERROR_RESOURCES);
APP_ERROR_CHECK(err_code)

A better solution is to wait for the actual events described under Return values in sd_ble_gattc_write().

[Autobot]

thanks for Jørgen Holmefjord,

I check this return code

do
{
    err_code = ble_nus_c_string_send(&m_ble_nus_c, &data, sizeof(data));
} while (err_code == NRF_ERROR_BUSY || err_code == NRF_ERROR_RESOURCES);
APP_ERROR_CHECK(err_code);

return this kind of error message show

 0> Logs dropped (45)
 0> <warning> ble_nus_c: Connection handle invalid.
 0> Logs dropped (45)
 0> <warning> ble_nus_c: Connection handle invalid.
 0> ndle invalid.
 0> ndle invalid.
 0> <error> app: Fatal error

Any other way to have possible send large data in NUS service...???