Simple direct advertising

[clementfumey]

Hello,

I'am trying to do directed advertisement with NRF51822 (Smart Beacon Kit pca20006). I don't have any previous connection with peer, its address is hard-coded. The goal is to hide advertisement to others and not to connect with the peer (the ultimate goal would be to have something like describe in the privacy message sequence charts of S132 but with S130)

I have tried to modified the "ble_app_beacon" example from SDK12 with S130 softdevice. Here is the modification I did :

ble_gap_addr_t     peer_addr = {BLE_GAP_ADDR_TYPE_PUBLIC,{0x19,0x75,0xAE,0xEB,0x27,0xB8}};

// B8:27:EB:AE:75:19 => RPi 

memset(&m_adv_params, 0, sizeof(m_adv_params));

m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_DIRECT_IND;
m_adv_params.p_peer_addr = &peer_addr; 
m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
m_adv_params.interval    = 0;
m_adv_params.timeout     = 0;

These are the only modifications I did (there is still the "p_manuf_specific_data" in the "ble_advdata_t" field.) When I flash the beacon, I don't have the red led blinking (like it was without modification) and can't see any advertising. I am doing something wrong? Would you recommend to use the ble_advertising module instead?

[clementfumey]

As far as I understood, direct advertisement should be ignored by a central scanner which address doesn't match the peer_address. So for a not too curious central the advertisement is "hidden". In my application the main goal is to know if a node is advertising or not. For this purpose, I want to "hide" my advertisements from others central than mine to avoid someone replicate my advertisement and make my central believe a beacon is alive.I know this is a very basic security scheme, but this is only a first step!