Hello, I'd like to do directed avertising to a central which has a random private resolvable address. My idea: both devices share a pre-defined IRK so the peripheral can compute the central's address and start advertising to this address. According to the core specs v4.2 this should be possible.
p.118: An initiator that receives a directed connectable advertising event that contains a resolvable private address for the initiator’s address, (InitA field) shall resolve the private address using the Local IRK values (see Section 1.3.2.3)
I've modified the central and peripheral examples of the experimental ble_app_blinky so I can work with directed advertising and this setup is working fine when using random static addresses. But as soon as I activate privacy on the central, the central does not react to advertising (i.e. no bluetooth stack event is generated).
On the central I'm using the following code to set privacy:
privacy.privacy_mode = BLE_GAP_PRIVACY_MODE_DEVICE_PRIVACY;
privacy.private_addr_cycle_s = 15*60;
privacy.private_addr_type = BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE;
privacy.p_device_irk = &irk;
sd_ble_gap_privacy_set(&privacy);
On the peripheral I start advertising as follows:
generate_hash(prand,hash,irk); // generates correct hash, verified
peer_addr.addr_type=BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE;
peer_addr.addr[0]=hash[0];
peer_addr.addr[1]=hash[1];
peer_addr.addr[2]=hash[2];
peer_addr.addr[3]=prand[0];
peer_addr.addr[4]=prand[1];
peer_addr.addr[5]=prand[2]; // 0b01xxxxxx
memset(&adv_params, 0, sizeof(adv_params));
adv_params.type = BLE_GAP_ADV_TYPE_ADV_DIRECT_IND;
adv_params.p_peer_addr = &peer_addr;
adv_params.fp = BLE_GAP_ADV_FP_ANY;
adv_params.interval = APP_ADV_INTERVAL;
adv_params.timeout = APP_ADV_TIMEOUT_IN_SECONDS;
err_code = sd_ble_gap_adv_start(&adv_params);
What am I missing?
nrf52 S132 SoftDevice v3.0.0 API
