NRF_ERROR_RESOURCES occurred when the connection is disconnected

[EarlBread]

Dear

First of all, I am so sorry because of my english skill.

I got NRF_ERROR_RESOURCES when the connection between NRF Module and mobile device is disconnected  due to the reduced signal strength because of long distance.

However, if I disconnect the connection by sending the disconnection command from mobile device, it works well without any errors.

I used app_timer_start api to send data for notification every 1s as following,

err_code = app_timer_start(m_bms_measurement1_timer_id, BMS_MEASUREMENT1_TIMER_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);

I already set NRF_SDH_BLE_GAP_EVENT_LENGTH as 100 and used BLE_GATTS_EVT_HVN_TX_COMPLETE.

But I had same result as before.

Thanks in advance.

[EarlBread]

I already got NRF_ERROR_RESOURCES  with DEBUG option. 

I also did BLE_GATTS_EVT_HVN_TX_COMPLETE as followings,

ble event handler as following,

void ble_cus_on_ble_evt( ble_evt_t const * p_ble_evt, void * p_context)
{
ble_cus_t * p_cus = (ble_cus_t *) p_context;

switch (p_ble_evt->header.evt_id)
{
case BLE_GATTS_EVT_WRITE:
on_write(p_cus, p_ble_evt);
break;

case BLE_GATTS_EVT_HVN_TX_COMPLETE:
ble_tx_completed = true;

default:
// No implementation needed.
break;
}
}

following function is sent every 1s

uint32_t ble_cus_bms_measurement1_update(ble_cus_t * p_cus, struct bms_measurement1_s *m_bms_measurement, uint16_t conn_handle)
{
ble_gatts_hvx_params_t params;
uint16_t len = sizeof(struct bms_measurement1_s);

memset(&params, 0, sizeof(params));
params.type = BLE_GATT_HVX_NOTIFICATION;
params.handle = p_cus->bms_measurement1_char_handles.value_handle;
params.p_data = m_bms_measurement;
params.p_len = &len;

if(ble_tx_completed == true)
{
ble_tx_completed = false;
return sd_ble_gatts_hvx(conn_handle, &params);
}else return 0;
//return sd_ble_gatts_hvx(conn_handle, &params);
}

connection interval as following,

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(400, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.1 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(650, UNIT_1_25_MS) /**< Maximum acceptable connection interval (0.2 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds). */

How can I know the hvn_tx_queue_size ? From the web, I got some information about increasing hvn_tx_queue_size as following,

static void ble_stack_init(void)
{
ret_code_t err_code;

err_code = nrf_sdh_enable_request();
APP_ERROR_CHECK(err_code);

// Configure the BLE stack using the default settings.
// Fetch the start address of the application RAM.
uint32_t ram_start = 0;
err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
APP_ERROR_CHECK(err_code);

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.gattc_conn_cfg.write_cmd_tx_queue_size = 7;

err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTC, &ble_cfg, ram_start);
APP_ERROR_CHECK(err_code);

// Enable BLE stack.
err_code = nrf_sdh_ble_enable(&ram_start);
APP_ERROR_CHECK(err_code);

// Register a handler for BLE events.
NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}

But I got NRF_ERROR_NO_MEM as following,

<warning> nrf_sdh_ble: Insufficient RAM allocated for the SoftDevice.

<warning> nrf_sdh_ble: Change the RAM start location from 0x20002260 to 0x20002308.

<warning> nrf_sdh_ble: Maximum RAM size for application is 0xDCF8.

<error> nrf_sdh_ble: sd_ble_enable() returned NRF_ERROR_NO_MEM.

<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at C:\nrf_sdk\examples\my projects\ble_app_bms_vn4_0912_1227\main.c:1302

PC at: 0x000320F3

<error> app: End of error report

My section Placement is following

FLASH_PH_START=0x0

FLASH_PH_SIZE=0x80000

RAM_PH_START=0x20000000

RAM_PH_SIZE=0x10000

FLASH_START=0x26000

FLASH_SIZE=0x5a000

RAM_START=0x20002260

RAM_SIZE=0xdda0

Thanks in advance,

[Karl Ylvisaker]

Hello,

Please use the Insert -> Code option when sharing code here on DevZone.

EarlBread said:

if(ble_tx_completed == true)
{
ble_tx_completed = false;
return sd_ble_gatts_hvx(conn_handle, &params);
}else return 0;
//return sd_ble_gatts_hvx(conn_handle, &params);
}

This will return 'as a success', since NRF_SUCCESS has the value 0, while actually having failed to queue the notification for sending. Your current way of using the boolean ble_tx_completed variable also limits you to having queued 1 notification for transfer. This might be sub-optimal, since multiple notifications may be queued and sent per connection event.

EarlBread said:

How can I know the hvn_tx_queue_size ? From the web, I got some information about increasing hvn_tx_queue_size as following,

As written in the documentation you reference the default queue size if configured by the BLE_GATTS_HVN_TX_QUEUE_SIZE_DEFAULT in the sdk_config.h file. Increase this define to increase the number of notifications you may have queued at any one time.

EarlBread said:

<warning> nrf_sdh_ble: Change the RAM start location from 0x20002260 to 0x20002308.

<warning> nrf_sdh_ble: Maximum RAM size for application is 0xDCF8.

EarlBread said:

RAM_START=0x20002260

RAM_SIZE=0xdda0

Please change your RAM_START and RAM_SIZE to the values indicated by the error message.
Please do this, and see if it resolves your issues.

Best regards,
Karl