GAP Address types

Question

Hi, 
 I use a personnal GAP Address, but it must be the type used:
-Public address.
-Random Static address.
-Private Resolvable address.
-Private Non-Resolvable address. 
 and what is the difference? 
 Code : 
 st_Gap_Addr.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC;
st_Gap_Addr.addr [0] = g_stBL[0];
st_Gap_Addr.addr [1] = g_stBL[1];
st_Gap_Addr.addr [2] = g_stBL[2];
st_Gap_Addr.addr [3] = g_stBL.[3];
st_Gap_Addr.addr [4] = g_stBL.[4];
st_Gap_Addr.addr [5] = g_stBL.[5] | 0xc0;
err_code = sd_ble_gap_address_set (&st_Gap_Addr);
APP_ERROR_CHECK (err_code); 
 Best Regards, 
 Charly

Carles · Accepted Answer

Hi Charly, 
 -Public address. 
 This is a global, fixed address. It must be registered with the IEEE Registration Authority and will never change during the lifetime of the device. 
 -Random Static address. 
 A random static address is simply a random number that can either be generated every time the device boots up or can stay the same for the lifetime of the device. But it cannot be changed within a single power cycle of the device. 
 -Private Resolvable address. 
 Those are generated from an identity resolving key (IRK) and a random number, and they can be changed often (even during the lifetime of a connection) to avoid the device being identified and tracked by an unknown scanning device. Only devices that possess the IRK distributed by the device using a private resolvable address can actually resolve that address, allowing them to identify the device. 
 -Private Non-Resolvable address. 
 Not very commonly used, a random number that you can change anytime. 
 Carles

GAP Address types

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