Setting Bluetooth Device Name in Zephyr

[DevinCallahan]

Using Zephyr, I'm looking to configure the BLE name of my devices to use the serial number they are provisioned with.  

To this end there is the API "bt_set_name" that seems like it should do it, but I have not yet found anyway to get it to actually change the name.  The Device always advertises with whatever CONFIG_BT_DEVICE_NAME is set to.

Has anyone successfully done this with Zephyr?

Thank you so much for your help!

[haakonsh]

You need to enable the config "Allow to set Bluetooth device name on runtime". 

In SESne:

(top toolbar) Project --> Configure nRF Connect SDK project --> menuconfig --> type "device name" in the filter box --> enable the 'Allow to set Bluetooth device name on runtime' configuration by toggling it's button and click 'configure' afterwards.

[DevinCallahan]

I did try this and it didn't help on its own.

What DID help is realizing that the "Advertising Data" struct that gets passed to "bt_le_adv_start" is where the name is actually being configured.  I just modified the value and length in that struct before starting the advertisement and it all worked.

I think there is a way to use "bt_set_name" but I still haven't gotten that way to work.  Too many flags.

[Saleh]

You can set the device name in your code by calling "bt_set_name" function, after when Bluetooth has enabled but before when advertisement has started.

Also it is necessary to enable dynamic name capability in the project configuration in addition to add BT_LE_ADV_OPT_USE_NAME to  bt_le_adv_param variable.

Add these options to prfj.conf file:

....

# Enable Dynamic name modification
CONFIG_BT_DEVICE_NAME_DYNAMIC=y
# Maximum chcaracter of the device name
# (Range: 2 to 248)
CONFIG_BT_DEVICE_NAME_MAX=30

and call bt_set_name after when bt has enabled but advertisement has not started

main.c

void main(void)
{
    struct bt_le_adv_param param;
    ...
    bt_enable(NULL);
    ...
    bt_set_name("new name");
    ...
    param.options = BT_LE_ADV_OPT_USE_NAME;
    ...
    bt_le_ext_adv_create(&param, NULL, &adv_set);
    bt_le_per_adv_start(adv_set);
    
}