bt_le_ext_adv_update_param() cannot change BDADDR

[loquat]

I am using the nrf connect SDK.

I want to switch multiple BDADDRs in one AdvertiseSet.
BDADDR does not change even if bt_le_adv_param.id is changed in bt_le_ext_adv_update_param().

Is there any way?

[loquat]

Inside the bt_le_ext_adv_cb.sent() callback function, we are calling bt_le_ext_adv_update_param().
Is this a problem?

[Kenneth]

If you are doing something wrong when calling bluetooth api's you will get an error message. As long as there is no error message you are fine.

Kenneth

[loquat]

Apparently, bt_id can only be set during adv_create and cannot be changed with update_param.

I would like to use bt_id_reset() instead.
However, if the id is associated with adv_create(), calling bt_id_reset() will return an error (-120).
What are the limitations of bt_id_reset()?

[Kenneth]

loquat said:

Apparently, bt_id can only be set during adv_create and cannot be changed with update_param.

So it's the same as old nRF5 SDK then.

loquat said:

What are the limitations of bt_id_reset()?

/**
 * @brief Reset/reclaim an identity for reuse.
 *
 * The semantics of the @a addr and @a irk parameters of this function
 * are the same as with bt_id_create(). The difference is the first
 * @a id parameter that needs to be an existing identity (if it doesn't
 * exist this function will return an error). When given an existing
 * identity this function will disconnect any connections created using it,
 * remove any pairing keys or other data associated with it, and then create
 * a new identity in the same slot, based on the @a addr and @a irk
 * parameters.
 *
 * @note the default identity (BT_ID_DEFAULT) cannot be reset, i.e. this
 * API will return an error if asked to do that.
 *
 * @param id   Existing identity identifier.
 * @param addr Address to use for the new identity. If NULL or initialized
 *             to BT_ADDR_LE_ANY the stack will generate a new static
 *             random address for the identity and copy it to the given
 *             parameter upon return from this function (in case the
 *             parameter was non-NULL).
 * @param irk  Identity Resolving Key (16 bytes) to be used with this
 *             identity. If set to all zeroes or NULL, the stack will
 *             generate a random IRK for the identity and copy it back
 *             to the parameter upon return from this function (in case
 *             the parameter was non-NULL). If privacy
 *             @kconfig{CONFIG_BT_PRIVACY} is not enabled this parameter must
 *             be NULL.
 *
 * @return Identity identifier (>= 0) in case of success, or a negative
 *         error code on failure.
 */
int bt_id_reset(uint8_t id, bt_addr_le_t *addr, uint8_t *irk);

From errno.h I can find that the new identity (addr) you are trying to create is the same as the old.

Best regards,
Kenneth

[loquat]

Is it possible to set a different addr for bt_id_reset?
Is it possible during advertising?