I want to use the ble_nus_data_send function.

[odenwar]

I am writing a program by moving the contents of twi_master_using_nrf_twi_mngr based on the ble_app_uart project.

The source code is as follows.

void read_all_cb(ret_code_t result, void * p_user_data)
{
    if (result != NRF_SUCCESS)
    {
        NRF_LOG_WARNING("read_all_cb - error: %d", (int)result);
        return;
    }
    
    uint8_t update            = m_buffer[0];
    uint8_t temp_L            = m_buffer[1];
    uint8_t tepm_H            = m_buffer[2];
    uint8_t gyroscope_X_L     = m_buffer[3];
    uint8_t gyroscope_X_H     = m_buffer[4];
    uint8_t gyroscope_Y_L     = m_buffer[5];
    uint8_t gyroscope_Y_H     = m_buffer[6];
    uint8_t gyroscope_Z_L     = m_buffer[7];
    uint8_t gyroscope_Z_H     = m_buffer[8];
    uint8_t accelerometer_X_L = m_buffer[9];
    uint8_t accelerometer_X_H = m_buffer[10];
    uint8_t accelerometer_Y_L = m_buffer[11];
    uint8_t accelerometer_Y_H = m_buffer[12];
    uint8_t accelerometer_Z_L = m_buffer[13];
    uint8_t accelerometer_Z_H = m_buffer[14];

    if (!LSM6DSO_DATA_IS_VALID(update))
    {
        update = m_prev_update;
    }

    // Show current average values every time sample index rolls over (for RTC
    // ticking at 32 Hz and 16 samples it will be every 500 ms) or when tilt
    // status changes.
    if (m_sample_idx == 0 || (m_prev_update && m_prev_update != update))
    {


        //NRF_LOG_RAW_INFO("Temp: " NRF_LOG_FLOAT_MARKER " | X: %3d, %3d, Y: %3d, %3d, Z: %3d, %3d,",
            //NRF_LOG_FLOAT((float)((m_sum.temp * 0.125) / NUMBER_OF_SAMPLES)),
        printf( "STATUS_REG : %1d ", update); 
        printf( "TEMP : %1d %1d \r\n", tepm_H, temp_L); 
        printf( "gyroscope     X: %3d, %3d, Y: %3d, %3d, Z: %3d, %3d, \r\n",
           // m_buffer[0],
           gyroscope_X_H, gyroscope_X_L, gyroscope_Y_H, gyroscope_Y_L, gyroscope_Z_H, gyroscope_Z_L);

        printf( "accelerometer X: %3d, %3d, Y: %3d, %3d, Z: %3d, %3d, \r\n",
            // m_buffer[0],
            accelerometer_X_H, accelerometer_X_L, accelerometer_Y_H, accelerometer_Y_L, accelerometer_Z_H, accelerometer_Z_L);

static uint8_t data_array[BLE_NUS_MAX_DATA_LEN]= "Send Message\n";
uint32_t       err_code;
static uint8_t index = 0;
uint16_t length = (uint16_t)index;
                        err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
                        if ((err_code != NRF_ERROR_INVALID_STATE) &&
                            (err_code != NRF_ERROR_RESOURCES) &&
                            (err_code != NRF_ERROR_NOT_FOUND))
                        {
                            APP_ERROR_CHECK(err_code);
                        }

       m_prev_update = update;

    }
}

Please tell me how to use ble_nus_data_send in PRINTF format.

[odenwar]

This is an advisory answer.
You can write the source code (function) as follows.

void bluetooth_send(const char *message){
  uint32_t err_code;
  char ch[40];
  uint16_t tx_len = strlen(message);

  err_code = ble_nus_data_send(&m_nus, (uint8_t *)message, &tx_len, m_conn_handle);

  uint8_t crlf[2] = {10, 13};
  tx_len = 2;
  err_code = ble_nus_data_send(&m_nus, (uint8_t *)crlf, &tx_len, m_conn_handle);
}