Hi, I want to set different gap event length for different peripheral on a ble central: 1 link with high throughput and 4 links with low throughput.
The sdk is 17.0.2, softdevice 7.1, hardware is pca10400.
I checked some post like:
"Multiple connections/links using the same tag is possible, and most, if not all BLE examples in the nRF5 SDK uses a single tag. But, with multiple tags, you can have different configurations for each link. Examples: 2 links with low throughput + one with high throughput, or 5 links, only one of them needs a large ATT MTU."
but I can not find any detail instruction how to use sd_ble_cfg_set() function add configurations.
Is there any example code to do this?
when i modify a new function from nrf_sdh_ble_default_cfg_set() as this:
ret_code_t ble_cfg_set(uint8_t conn_cfg_tag, uint32_t * p_ram_start, uint8_t event_len, uint8_t total_link, uint8_t central_link, uint8_t perip_link)
{
uint32_t ret_code;
ret_code = nrf_sdh_ble_app_ram_start_get(p_ram_start);
if (ret_code != NRF_SUCCESS)
{
return ret_code;
}
#if defined (S112) || defined(S312)
STATIC_ASSERT(NRF_SDH_BLE_CENTRAL_LINK_COUNT == 0, "When using s112, NRF_SDH_BLE_CENTRAL_LINK_COUNT must be 0.");
#endif
// Overwrite some of the default settings of the BLE stack.
// If any of the calls to sd_ble_cfg_set() fail, log the error but carry on so that
// wrong RAM settings can be caught by nrf_sdh_ble_enable() and a meaningful error
// message will be printed to the user suggesting the correct value.
ble_cfg_t ble_cfg;
#if (NRF_SDH_BLE_TOTAL_LINK_COUNT != 0)
// Configure the connection count.
memset(&ble_cfg, 0, sizeof(ble_cfg));
ble_cfg.conn_cfg.conn_cfg_tag = conn_cfg_tag;
ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count = total_link;
ble_cfg.conn_cfg.params.gap_conn_cfg.event_length = event_len;
ret_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_CONN_CFG_GAP.",
nrf_strerror_get(ret_code));
}
// Configure the connection roles.
memset(&ble_cfg, 0, sizeof(ble_cfg));
#if !defined (S122)
ble_cfg.gap_cfg.role_count_cfg.periph_role_count = perip_link;
#endif // !defined (S122)
#if !defined (S112) && !defined(S312) && !defined(S113)
ble_cfg.gap_cfg.role_count_cfg.central_role_count = central_link;
ble_cfg.gap_cfg.role_count_cfg.central_sec_count = MIN(central_link,
BLE_GAP_ROLE_COUNT_CENTRAL_SEC_DEFAULT);
#endif // !defined (S112) && !defined(S312) && !defined(S113)
ret_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_GAP_CFG_ROLE_COUNT.",
nrf_strerror_get(ret_code));
}
// Configure the maximum ATT MTU.
#if (NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 23)
memset(&ble_cfg, 0x00, sizeof(ble_cfg));
ble_cfg.conn_cfg.conn_cfg_tag = conn_cfg_tag;
ble_cfg.conn_cfg.params.gatt_conn_cfg.att_mtu = NRF_SDH_BLE_GATT_MAX_MTU_SIZE;
ret_code = sd_ble_cfg_set(BLE_CONN_CFG_GATT, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_CONN_CFG_GATT.",
nrf_strerror_get(ret_code));
}
#endif // NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 23
#endif // NRF_SDH_BLE_TOTAL_LINK_COUNT != 0
// Configure number of custom UUIDS.
memset(&ble_cfg, 0, sizeof(ble_cfg));
ble_cfg.common_cfg.vs_uuid_cfg.vs_uuid_count = NRF_SDH_BLE_VS_UUID_COUNT;
ret_code = sd_ble_cfg_set(BLE_COMMON_CFG_VS_UUID, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_COMMON_CFG_VS_UUID.",
nrf_strerror_get(ret_code));
}
// Configure the GATTS attribute table.
memset(&ble_cfg, 0x00, sizeof(ble_cfg));
ble_cfg.gatts_cfg.attr_tab_size.attr_tab_size = NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE;
ret_code = sd_ble_cfg_set(BLE_GATTS_CFG_ATTR_TAB_SIZE, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_GATTS_CFG_ATTR_TAB_SIZE.",
nrf_strerror_get(ret_code));
}
// Configure Service Changed characteristic.
memset(&ble_cfg, 0x00, sizeof(ble_cfg));
ble_cfg.gatts_cfg.service_changed.service_changed = NRF_SDH_BLE_SERVICE_CHANGED;
ret_code = sd_ble_cfg_set(BLE_GATTS_CFG_SERVICE_CHANGED, &ble_cfg, *p_ram_start);
if (ret_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("sd_ble_cfg_set() returned %s when attempting to set BLE_GATTS_CFG_SERVICE_CHANGED.",
nrf_strerror_get(ret_code));
}
return NRF_SUCCESS;
and call it like this:
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;
// nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
// APP_ERROR_CHECK(err_code);
err_code = ble_cfg_set(1, &ram_start, 10, 4, 4, 0);
APP_ERROR_CHECK(err_code);
err_code = ble_cfg_set(2, &ram_start, 20, 1, 1, 0);
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);
}
It does not work...