Zephyr nRF52840 - How to get the MAC address of BLE

[Neeraj Dhekale]

Hello All,

How can I get my nRF52840's MAC address in Zephyr? Actually, I want to append the last 4 characters of the MAC address in CONFIG_BT_DEVICE_NAME.

So, when I will check in nRF Connect App. I should get the name like ABC_12:2D.

Thanks and advance.

Regards,

Neeraj Dhekale

[Simon]

Take a look at this ticket: https://devzone.nordicsemi.com/f/nordic-q-a/76344/retrieve-ble-mac-address-in-zephyr-environment

Best regards,

Simon

[Neeraj Dhekale]

I have already tried above URL. I was getting an error

 error: 'reinterpret_cast' undeclared (first use in this function)
   31 |  const uint8_t* part_0 = reinterpret_cast<const uint8_t*>(&device_addr_0);
      |                          ^~~~~~~~~~~~~~~~
/home/neeraj/Applications/Nordic/IOTiansRockFall_IMU/src/IG_Eddystone.h:31:26: note: each undeclared identifier is reported only once for each function it appears in
/home/neeraj/Applications/Nordic/IOTiansRockFall_IMU/src/IG_Eddystone.h:31:43: error: expected expression before 'const'
   31 |  const uint8_t* part_0 = reinterpret_cast<const uint8_t*>(&device_addr_0);
      |                                           ^~~~~
/home/neeraj/Applications/Nordic/IOTiansRockFall_IMU/src/IG_Eddystone.h:32:43: error: expected expression before 'const'
   32 |  const uint8_t* part_1 = reinterpret_cast<const uint8_t*>(&device_addr_1);
      |                                           ^~~~~
/home/neeraj/Applications/Nordic/IOTiansRockFall_IMU/src/IG_Eddystone.h:30:15: warning: unused variable 'device_addr_1' [-Wunused-variable]
   30 |  unsigned int device_addr_1 = NRF_FICR->DEVICEADDR[1];
      |               ^~~~~~~~~~~~~
/home/neeraj/Applications/Nordic/IOTiansRockFall_IMU/src/IG_Eddystone.h:29:15: warning: unused variable 'device_addr_0' [-Wunused-variable]
   29 |  unsigned int device_addr_0 = NRF_FICR->DEVICEADDR[0];

Thanks and regards,

Neeraj

[Simon]

Try using bt_id_get() like Einar suggested. Check out the Zephyr Bluetooth Beacon sample to see how to use this function.

Best regards,

Simon