irk_match when having a BLE_GAP_EVT_CONNECTED

[Marcel Mulder]

Hi all,

I have made my own device manager because the device manager from Nordic is somewhat bloat (in code and resources) and I needed to add a feature, ranking the devices so the less used device is removed when the storage is full and a new devices wants to bond. I was not able to create this feature outside the device manager. Anyway, I want to test the manager and every thing is working well. The only thing I am not able to test is irk. I never see an irk_match. The devices gets identified by means of the address or by means of the diversifier. I find this rather strange be cause the iPhone uses a random address, so it should be identified with an irk. Does anybody knows why I do not get a irk_match in a connect event?

Thanks in advance,

Marcel

[Ulrich Myhre]

Hi,

You will only get an irk_match if you advertise or connect using a whitelist with IRKs in it (irk_count > 0). As a peripheral, the SoftDevice will resolve all devices trying to connect to or scan it and only respond if there is a hit in the address or IRK whitelists. As a central, the SoftDevice will process all connectable advertisers that use resolvable address types and match them before trying to connect

If a connection happens due to a match coming from the IRK part of the whitelist, the index to entry which was matched will be present in the irk_match field of the connected event.

[Marcel Mulder]

I understand the specification. I do not understand how your softdevice is working.

You are saying that the diversifier does not playing any role here. How do you explain the following code from the device_manager_peripheral.c in function device_instance_find(...)

if (((NULL == p_addr) && (div == m_peer_table[index].div)) || ((NULL != p_addr) && (memcmp(&m_peer_table[index].peer_id.id_addr_info, p_addr, sizeof(ble_gap_addr_t)) == 0)))

If no address is available than you use the diversifier to find the device in the peer table. I searched trough the code of device_manager_peripheral.c and irk is not used except when white listing. The bd address can change so that's not a unique key. The diversifier is not playing any role as you state. So the big question is. What do I use from the softdevice to identify a device?