"BLE_ERROR_GATTS_SYS_ATTR_MISSING" (0x3401) occurs during continuous BLE transmission

[yokokawa]

OS in development environment ：Windows7
HARD :(Taiyo Yuden)EBSHSN Series Evaluation Board : Central / Peripherals
CPU :(Nordic) nRF52832 / ARMR Cortex-M4F 32 bit processor 28-pin Land Grid Array / 15GPIOs / SWD
Soft Ver:nRF5_SDK_15.3.0_59ac345

“BLE_ERROR_GATTS_SYS_ATTR_MISSING” occurs when 2k bytes of data are sent repeatedly.
Please tell me how to resolve.

* This does not occur when sending a single shot.
* Peripheral device for one central vs. 4 peripheral communication
* The central and peripheral settings are the same.

------------------------< Setting >-------------------------
/* Communication cycle: 15ms to 30ms */
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_1_25_MS) /**< Minimum acceptable connection interval (15 ms) */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(30, UNIT_1_25_MS) /**< Maximum acceptable connection interval (30 ms) */
/* Data length: 247byte */
#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247

------------------------< program >-------------------------
do
{
  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);   <---   (Error location)
  }
} while (err_code == NRF_ERROR_RESOURCES);
------------------------------------------------------------

Thanking you in advance

[Edvin]

Hello,

You say that ble_nus_data_send() returns BLE_GATTS_VAR_ATTR_LEN_MAX only when you send a lot of data? Does that mean that it initially return NRF_SUCCES, and then after a while, it returns BLE_GATTS_VAR_ATTR_LEN_MAX? Or does it return BLE_GATTS_VAR_ATTR_LEN_MAX immediately (on the first attempt)?

What does the following event in your ble_evt_handler() look like?

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break;

[yokokawa]

1) Returns BLE_ERROR_GATTS_SYS_ATTR_MISSING when a large amount of data is sent. NRF_SUCCES is returned at first, and BLE_ERROR_GATTS_SYS_ATTR_MISSING is returned after a while.
”BLE_ERROR_GATTS_SYS_ATTR_MISSING is not returned from the beginning.
2) The structure of the BLE_GATTS_EVT_SYS_ATTR_MISSING event of ble_evt_handler () is the same.
The BLE_GATTS_EVT_SYS_ATTR_MISSING event of ble_evt_handler () does not occur.

[yokokawa]

1) EBSHSN (Evaluation board) is used.
2) Flow control can be disabled.
3) The UART pin is not changed.
---------------------------------------------------------------------------------
#define RX_PIN_NUMBER 8
#define TX_PIN_NUMBER 6
#define CTS_PIN_NUMBER 7
#define RTS_PIN_NUMBER 5
---------------------------------------------------------------------------------
* Flow control is enabled in “main.c”, but flow control is not set in the “pca10040.h” board setting.

* Even when flow control is prohibited, the same error occurred.

*If flow control was disabled, an overrun error occurred during reception.

[Edvin]

Are you sure that you use the correct baudrate? Is anything connected to the UART pins? I am not familiar with the evaluation board that you use. Is it possible to reproduce this issue with an nRF52832 DK?

[yokokawa]

1)A label is used to set the baud rate.
---------------------------------------------------------------------------------------------------------------
app_uart_comm_params_t const comm_params =
{
.rx_pin_no = RX_PIN_NUMBER,
.tx_pin_no = TX_PIN_NUMBER,
.rts_pin_no = RTS_PIN_NUMBER,
.cts_pin_no = CTS_PIN_NUMBER,
.flow_control = APP_UART_FLOW_CONTROL_ENABLED,
.use_parity = false,
.baud_rate = UART_BAUDRATE_BAUDRATE_Baud230400
};
---------------------------------------------------------------------------------------------------------------
2)Nothing is connected to the UART port.
3)nRF52832 Cannot reproduce because there is no DK.
* Is it related to being the center of multi-connections?

[Edvin]

yokokawa said:

Nothing is connected to the UART port.

 If nothing is connected to the UART, and you use flow control, then it will not be able to write anything on the UART, because it doesn't get the Clear To Send signal, and hence, your UART buffer will fill up. If you don't intend to use the UART, you should remove it from your application. 

[yokokawa]

There was a defect in the explanation.
The device in which the error has occurred is a BLE multi-connection central device.
Is there a relationship between BLE multi-connection and UART error?

[Edvin]

yokokawa said:

Is there a relationship between BLE multi-connection and UART error?

 No. There shouldn't be.