NRF_ERROR_RESOURCES

[Sagar291195]

When I send 90 KB data via BLE. Sometime I am getting NRF_ERROR_RESOURCES error. I have tried all the things that are available in support site. I am reading data from SPI and send it via BLE. I set SPI irq priority is 6. If I set SPI irq priority to 7 I am not getting Event for SPI transfer done. I think I am facing this issue because of irq handling. so please suggest me.

[Sigurd]

Hi,

The function sd_ble_gatts_hvx() will return NRF_ERROR_RESOURCES when too many notifications are queued, i.e. the internal SoftDevice buffer is full.

Try increasing NRF_SDH_BLE_GAP_EVENT_LENGTH  in sdk_config.h , it should indirectly increase the buffer size.

The size could also be set directly like this (should be added to ble_stack_init() in main.c ):

    ble_cfg_t ble_cfg;
    memset(&ble_cfg, 0, sizeof ble_cfg);
    ble_cfg.conn_cfg.conn_cfg_tag           = APP_BLE_CONN_CFG_TAG;
    ble_cfg.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size = 20;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTS, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

[Sagar291195]

I have already done this but still I am getting same problem.  I have already done all the things that I found on support link.

[Sigurd]

Hi,

How are you queuing these 90 KB ? All at once ?

What is the value of NRF_SDH_BLE_GATT_MAX_MTU_SIZE and NRF_SDH_BLE_GAP_DATA_LENGTH ?

What connection interval are you using for the BLE link?

What type of device are you connecting to? It could be that the other device does not support the amount of throughput you are trying to achieve.

You might find this chapter in the SDS about throughput useful. The S132 one has some more numbers shown.

[Sagar291195]

No I am using timer, After every 10ms I am reading 244 bytes and send it to BLE.

NRF_SDH_BLE_GATT_MAX_MTU_SIZE  247

NRF_SDH_BLE_GAP_DATA_LENGTH  251

#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(40, UNIT_1_25_MS)

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)

I am using BLE5.0 supported MI mobile.

[Sigurd]

Hi,

What did you set hvn_tx_queue_size and NRF_SDH_BLE_GAP_EVENT_LENGTH to ?

Are you using 1M or 2M PHY ?

[Sagar291195]

#define NRF_SDH_BLE_GAP_EVENT_LENGTH 320

hvn_tx_queue_size  = 20
.phys.tx_phys = BLE_GAP_PHY_2MBPS | BLE_GAP_PHY_1MBPS,

.phys.rx_phys = BLE_GAP_PHY_2MBPS | BLE_GAP_PHY_1MBPS,

If you need other data please let me know. I will inform you,