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);

[Epasta]

Hello, 

I have tried again what you suggest to me but still not work.

I have this on the log:
I: No ID address. App must call settings_load()
I: Identity: E4:B3:9D:F1:7E:1F (random).

thanks for the time that you are spending with me.

Thanks

[Vidar Berg]

Hello,

Did you make sure to call bt_ctlr_set_public_addr() before bt_enable() call in your application? I was unable to reproduce this here with SDK v2.8.0 and the peripheral_lbs sample. Which SDK version are you using?

[Epasta]

Hello,

yes i have added bt_ctlr_set_public_addr() before bt_enable(). See attached image.

I'm using NCS V2.6.1

Thanks

[Vidar Berg]

Hello,

I was not able to reproduce it here with SDK v2.6.1 either. Please try to do a full chiperase when loading the FW to ensure there is no existing address stored in the Settings storage partition. You can do so by selecting the 'Erase and Flash' action here:

[Epasta]

Hello Vidar,

thanks for the advice. Now it works!

Thanks a lot for your time.
Best regards