Change mac address quickly

RE: Change mac address quickly

MartinBL — Fri, 09 Oct 2015 09:56:50 GMT

As far as I can see you are only setting the mac address once before you enter a while forever loop that does nothing but print the value of the FICR register?

And it also looks like you are only setting the first two bytes of the mac address as 0xAA. The rest of the bytes will then be random. Try for i<6 instead of i<2 to iterate through all 6 bytes of the mac address.

RE: Change mac address quickly

Jacksonlv — Thu, 08 Oct 2015 02:43:05 GMT

I use the code below but I got the mac address is different from I set .What's more,I find it is constant.

ble_gap_addr_t m_address_1;
m_address_1.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE;

for(uint8_t i = 0; i < 2; i++)
{
    m_address_1.addr[i] = 0xAAAAAAAA;
}

sd_ble_gap_address_set(BLE_GAP_ADDR_CYCLE_MODE_NONE, &m_address_1);

while(1)
{      
    for(uint8_t i = 0; i < 2; i++)
    {
        Serial.println(NRF_FICR->DEVICEID[i]);
    }
    delay(1000);
}

RE: Change mac address quickly

MartinBL — Tue, 25 Aug 2015 13:55:21 GMT

I can't really see why that won't work for you, but I made an example for you. It uses a timer to change the mac address at an interval of your own choosing. It seemed to work at least down to a 100ms. It is a quick and dirty example based on the ble template example in SDK 9.0.0. Just extract it to e.g. "SDK_9.0.0_folder\examples\ble_peripheral" and hopefully it will compile out of the box.

change-mac-address-quickly.zip