ble_nus_data_send() can not send data to mobile app (nRF UART v2.0)

[Pepam]

Hi,

I am developing with nRF52832, SDK 15.3

I have an issue with sending data over NUS service. When I flash the code to nRF, it starts advertising, but when I connect to it by nRF UART v2.0 mobile app, LED 1 on DK just fast double blinks and DK disconnects my phone. My code is modified to sending data over ble_nus_data_send() every time app_timer handler is triggered. Value to be send is modified from intenger data type, to char data type, so maybe there might be the problem.

thanks for help!

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static void data_send()

{

uint32_t err_code;

int16_t i = 123 ;

char buf[BUFSIZ];

snprintf(buf, sizeof(buf), "%d", i);

static uint16_t length = sizeof(buf);

err_code = ble_nus_data_send(&m_nus, buf, &length, m_conn_handle);

if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) &&

(err_code != NRF_ERROR_NOT_FOUND) )

{

APP_ERROR_CHECK(err_code);

}

NRF_LOG_INFO("Value Received !");

}

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static void data_send()
{
  uint32_t       err_code;
  int16_t   i = 123 ;
  char  buf[BUFSIZ];
  snprintf(buf, sizeof(buf), "%d", i);
  static uint16_t length = sizeof(buf);

      err_code =   ble_nus_data_send(&m_nus, buf, &length, m_conn_handle);

         if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) &&
                         (err_code != NRF_ERROR_NOT_FOUND) )
                    {
                        APP_ERROR_CHECK(err_code);
                    }

        NRF_LOG_INFO("Value Received !");


}

static void repeated_timer_handler(void * p_context)
{
    data_send();
}