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Send data from saadc through BLE UART

I'm using 14.2 SDK SES . I'm trying to send data of sensor through BLE . When i enable Notification in mobile applicaion (nRF connect) i generally dont get any value or garbage values. I combined saadc and ble_app_uart application for this .

Here is the code for sending data :

void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        
        ret_code_t err_code;
        uint8_t value[BLE_NUS_MAX_DATA_LEN];
        static uint8_t index = 0;

        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
        APP_ERROR_CHECK(err_code);

        // printf("x = %d\r\n", p_event->data.done.p_buffer[0]);
        // the above line prints correctly the sensor data . But when i try to save it , garbage value are stored .
        
        sprintf(value[0] , "testing = %d",p_event->data.done.p_buffer[0]);
        printf(value);

        uint16_t length = (uint16_t)index;

		ble_nus_string_send(&m_nus, value , &length);

						
        m_adc_evt_counter++;
    }
}

// printf("x = %d\r\n", p_event->data.done.p_buffer[0]);
This line correctly prints sensor data but when i store , garbage value are stored . I also used sprintf function . Still getting garbage values .