Changing hvn_tx_queue_size with S132 V5.1

[Kyle Krueger]

I am using S132 V5.1 in combination with nRF5 14.2, and I cannot find where I can set hvn_tx_queue_size.

We are using the new option to configure the softdevice using the sdk_config.h file, thus

uint32_t 	sd_ble_cfg_set (uint32_t cfg_id, ble_cfg_t const *p_cfg, uint32_t app_ram_base)

is never called.

Is it still possible to change the hvn_tx_queue_size when using

uint32_t nrf_sdh_ble_default_cfg_set(conn_cfg_tag, &ram_start);  /* Configure the BLE stack with the settings specified in sdk_config. */

if so, how; do we still have to call sd_ble_cfg_set() somewhere, does this function play nicely with the new sdk_config.h defines?

[Petter Myhre]

Just do something like this:

memset(&ble_cfg, 0, sizeof ble_cfg);
ble_cfg.conn_cfg.conn_cfg_tag                     = conn_cfg_tag;
ble_cfg.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size = 4;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTS, &ble_cfg, ram_start);
APP_ERROR_CHECK(err_code);

After you have called nrf_sdh_ble_default_cfg_set().

[Kyle Krueger]

Ok, looks easy enough.

However, the documentation sounds like this will override all settings from nrf_sdh_ble_default_cfg_set() which we have defined in our app_config.h.

"If a configuration is set more than once, the last one set is the one that takes effect on sd_ble_enable. Any part of the BLE stack that is NOT configured with sd_ble_cfg_set will have default configuration."

Does this mean we shouldn't bother to use nrf_sdh_ble_default_cfg_set() in the first place? I expected that it was the new paradigm to be using.

[Petter Myhre]

It shouldn't override all settings. It should only override the GATTS connection configuration, since BLE_CONN_CFG_GATTS is used as configuration ID. It is up to you if you want to use nrf_sdh_ble_default_cfg_set() or not, you can set up everything manually, or you can call nrf_sdh_ble_default_cfg_set() and modify some of the configurations afterwards.

[Kyle Krueger]

Ok, thanks for the help. We will stick with the procedure you recommended of modifying some of the config details afterwards. Would sd_ble_opt_set() be able to serve the same purpose in our case? If so, I will use that since it is clearer upon reading that no other config details will be modified when calling it other than the one specified.

[Petter Myhre]

sd_ble_opt_set()? I'm not following.