can't send data with usbd ble _uart example using ble_nus_data_send

[nikola]

I am trying to send data obtained from  my sensor (calculating with twi scanner example )  via BLE using the ble_nus_data_send function. I just tried to send this data via UART with app_usbd_cdc_acm_write function and it works correctly . but when I want to send the same data  via  BLE it does'nt function . the type of data that I am using iss uint32_t.

Could anyone help me to find a way to solve this problem?

this is the function that I am using to send the data :

void sendcom(char c[]) {
  uint8_t length;
  length = strlen(c);
  ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm,
      c,
      length);
ret = ble_nus_data_send(&m_nus,
                spo2,
                &length,
                m_conn_handle);
  if (ret == NRF_SUCCESS) {
    NRF_LOG_RAW_INFO(" %s \n \r ", c);
  }
}

here is where I  call  this function

case NRF_TIMER_EVENT_COMPARE3:
  if (cycle_timer == 1) {
      cycle1();
    }
    if (cycle_timer % 2 == 0) {
      itoa(spo2, result, 10);
       strcat(result, "\r\n");
      sendcom(result);
    
    }

[StefXinet]

Hi,

you could try to enable the NRF_LOG and read what is happening over the BLE. It helped me a lot.

Also I suggest to try the ble_nus_data_send() function passing fixed parameters, then using arguments: so you can test your code step by step.

bye

[nikola]

ok i want to try to do that
but do I have to convert my variable from uint32_t to uint8_t ??

[StefXinet]

nikola said:

convert my variable from uint32_t to uint8_t ?

sorry, whitch 32bit variable?

[ovrebekk]

Hi 

The length parameter that you pass to the ble_nus_data_send(..) function should be a uint16_t variable, not a uint8_t variable. 

Possibly this is the cause of the issue. 

Best regards
Torbjørn