For nrf52840 need to be change the BLE device name and set the Password example code!!

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

Einar Thorsrud — Thu, 22 Apr 2021 09:14:04 GMT

Then I suggest you start by fixing the errors so that it builds without warnings. If it still does not work, then please let me know how you test in detail. Also you cannot ignore return values. How do you know that sd_ble_gap_device_name_set() is successfull?

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

chandru jasi — Thu, 22 Apr 2021 08:29:30 GMT

Dear sir,

Device name set code is below, and i'm able to change the device name but once reset or OF/ON conditions the existing name is coming, what to to??

static void setDeviceName(uint8_t *device_name)
{
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

/* Change device name */
uint32_t err_code = sd_ble_gap_device_name_set(&sec_mode,
(const uint8_t *)device_name,
strlen(device_name));
APP_ERROR_CHECK(err_code);

/* Store Current connection state od adv lib */
uint16_t m_adv_current_slave_link_conn_handle_saved = m_advertising.current_slave_link_conn_handle;

/* Re-initialize advertising module */
advertising_init();

/* Re-store Current connection state lib */
m_advertising.current_slave_link_conn_handle = m_adv_current_slave_link_conn_handle_saved;

printf("Name has been set %s \n",device_name);
nrf_gpio_pin_clear(GREEN_LED);
}

Thanks & Regards

Chandru.A

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

Einar Thorsrud — Thu, 22 Apr 2021 08:13:19 GMT

Can you show what you have done and explain how you test and in which way it does not work? Also let me know if you get any error or warnings?

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

chandru jasi — Thu, 22 Apr 2021 08:02:15 GMT

Dear sir,

As requested by you, I have tried the device name change, which is not changed, and the i'm using nRF5 SDK ble_app_uart (nRF52840_V17\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\ble_app_uart) base code, herewith i want to the change device name by using command command from mobile. Or uart . kindly suggest the solutions

regards

Chandru.A

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

Einar Thorsrud — Thu, 22 Apr 2021 07:24:28 GMT

Hi Chandru,

Is this the passkey that can be used for MITM protection in BLE pairing, or is it something else? If you mean passkey, then you can set a passkey as shown here. If you want to set it from the phone then you need a custom service for it, or if you just want to generate it you could use the RNG to generate a 6 digit random number.

Einar

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

chandru jasi — Thu, 22 Apr 2021 07:19:29 GMT

Dear sir,

Thanks For quick responds!!.

Regarding password, Once we changed device name like that, even password needs to be change, once connect with mobile again it should not ask PW. and every new pair the device should ask password, which is the our expectations.

Thanks &Regards

Chandru

RE: For nrf52840 need to be change the BLE device name and set the Password example code!!

Einar Thorsrud — Thu, 22 Apr 2021 07:09:45 GMT

Hi Chandru,

Assuming you use the nRF5 SDK you can change the device name using sd_ble_gap_device_name_set(), for instance as suggested here. Note that the advertising data also needs to be generated again as you can see in the end of the snippet. This snippet shows how to do this from the nRF isolated. You can also write to the device name characteristic (UUID 0x2A00) from the phone as you suggest if you only use Android, but for iOS this is not possible. So another option would be to use another mechanism (typically another custom service) to set the device name from a mobile phone, and then use the code indicated above.

Regarding password I am not sure what you refer to there. Can you elaborate?

Einar