Bluetooth address and settings_load()

[Epasta]

Hello all,

i have a problem and I hope that someone can help me.

I can change the bluetooth address of the device with the following code:

err = bt_addr_le_from_str(addr_str, type_str, &addr);
if (err) {
	printk("Invalid BT address (err %d)\n", err);
}

if (addr.type == BT_ADDR_LE_PUBLIC) {
	printk("Using public address\n");
	err = bt_ctlr_set_public_addr(addr.a.val);
	if (err) {
        printk("Failed to set public address (err %d)\n", err);
    } else {
        printk("Public address set successfully\n");
    }
	return;
}

and this is okay.

I have the problem when I add this part of code:
CONFIG_SETTINGS=y

and

if (IS_ENABLED(CONFIG_SETTINGS)) {
	settings_load();
	printk("Settings load \n");
}

With this part of code I can not set my bluetooth address. The bluetooth address of the the device is not the one that I have setted but is the one inside the chip (i think).

I need to add settings_load() to keep the bond device information after the power off.

How can avoid this??

Thanks in advance.

[Vidar Berg]

Hello,

The address handling is a bit different when BT settings is enabled, but I'm unsure why it no longer works after enabling it. Please try to use the bt_id_create() host function instead of bt_ctlr_set_public_addr() from the controller. 

Which version of the SDK are you using?

Thanks,

Vidar

[Epasta]

Hello, 
I had already tried to use "bt_id_create()" but i have always err-22.

bt_addr_le_t newAddr;
	err = bt_addr_le_from_str("DE:AD:BE:EF:BA:11", "random", &newAddr);
	if (err < 0) {
		printk("Error conversion bt addres %d)\n", err);
	}

	printk("Bluetooth address readed: %x%x%x%x%x%x: ",  newAddr.a.val[0], newAddr.a.val[1], newAddr.a.val[2], newAddr.a.val[3], newAddr.a.val[4],  newAddr.a.val[5]);

	err = bt_id_create(&newAddr, NULL);
	if (err < 0) {
		printk("Creating new ID failed (err %d)\n", err);
	}

I can not set "CONFIG_BT...." I have unknow symbol.

I'm still investigate why I have this problem.

I'm using NCS2.6.1 with VSCode.
If you can help me many thanks in advance.

Best regards

[Vidar Berg]

Hello,

here you are attempting to set a random static address and have the stack generate the IRK for you. This cannot be done before bt_enable().

[Epasta]

Hello,

So, what can be a solution?

thanks

[Vidar Berg]

Hello,

I'm not sure what you're trying to achieve. Are you looking to set a random static address or a public address? In the last code snippet you posted, it seems you're trying to set a random static type and have the stack generate the IRK for you. However, as noted in the API documentation, the stack cannot generate the IRK before bt_enable(). To avoid this, you can specify and pass an IRK to this function yourself.

[Epasta]

Hello, 

"random" was my mistake. it was just one attempt and i didn't update the code.
I wuold like to set my bluetooth address like "DE:AD:BE:EF:BA:11"

Thanks

[Vidar Berg]

Hello,

Thanks for the clarification. I should have tested this first, I see now that bt_id_create() won't work when you want to set a public address with the Softdevice controller. Please try to run this code before bt_enable() in your application:

#include <zephyr/bluetooth/controller.h>
    ...
    const uint8_t addr[] = {0x11, 0xBA, 0xEF, 0xBE, 0xAD, 0xDE};
	bt_ctlr_set_public_addr(addr);