Filtering BLE devices by device name

[JPSvanderWalt]

How do I filter and connect to BLE devices using the device name in Zephyr?

[JPSvanderWalt]

I added the device name to the advertising data as bellow:

#define DEVICE_NAME			CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN		(sizeof(DEVICE_NAME) - 1)

struct bt_conn *default_conn;

static const struct bt_data ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
	BT_DATA_BYTES(BT_DATA_NAME_COMPLETE, DEVICE_NAME),
	BT_DATA_BYTES(BT_DATA_UUID128_ALL,
		0xef, 0x41, 0x16, 0xdf, 0x0a, 0x11, 0x4b, 0x49,
		0xae, 0x5a, 0x65, 0x92, 0xd5, 0xa2, 0x6d, 0xa5),
};

I then get the following error in the serial terminal

Advertising failed to start (err -22)

Where can I look up the error code?

[Heidi]

Hi!

-22 means invalid argument. You can look up the error codes in libc minimal errno.h or newlib errno.h depending on if your application is built with newlib library or not (CONFIG_NEWLIB_LIBC is enabled). 

You have to add it using the BT_DATA macro like this:

BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LENGTH)

[JPSvanderWalt]

Hi!

I have tried the suggested BT_DATA macro and I am still getting the same error.  I even tried to add it to the scan response data with no success.

static const struct bt_data ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
	//BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME,DEVICE_NAME_LEN),
	BT_DATA_BYTES(BT_DATA_UUID128_ALL,
		0xef, 0x41, 0x16, 0xdf, 0x0a, 0x11, 0x4b, 0x49,
		0xae, 0x5a, 0x65, 0x92, 0xd5, 0xa2, 0x6d, 0xa5),
};

static const struct bt_data sd[] = {
	BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),

};

err = bt_le_adv_start(BT_LE_ADV_CONN_NAME, ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));

I am not sure if there is something specific I need to add to the config file to enable this?

[Heidi]

That's a bit strange. How are you defining DEVICE_NAME_LEN?

[JPSvanderWalt]

Hi I am defining it as below:

#define DEVICE_NAME_LEN		(sizeof(DEVICE_NAME) - 1)