Example for Extended advertisement receive node

[Ashishsult]

Hi, 

I am using nrf SDK 1.9.0 and want to receive extended advertisements on a device (nrf52832) but I didn't got any example. Do you have any sample? 

[Hung Bui]

Hi Ashish, 

Which feature of extended advertising are you planning to do ? 

You just need to add CONFIG_BT_EXT_ADV=y in the project config to allow scanning in extended advertising. 
You would also need .type     = BT_LE_SCAN_TYPE_ACTIVE if you plan to do active scanning. 
 I would suggest to have a look at the central_hr_coded example. In the example we scan for CODED PHY extended advertising. 

[Ashishsult]

I just wanted to send around 60 bytes in the secondary channel.

I modify the example "periodic_adv" and setting the data as bt_le_ext_adv_set_data(adv, NULL, 0, ad, ARRAY_SIZE(ad))

periodic_advCopy.zip

I can not see data using central_hr_coded as I assume it need to be connected.

Whereas, this would be broadcast extended messages. 

[Hung Bui]

Hi Ashish, 

I attached here the code I modified to show how extended advertising can be scan. I based on the central_hr_coded but the advertising is on 1Mbps not CODED PHY. You can testing using nRF52832 dk. 

You should see something like this in the log of the central: 

Note that nRF Sniffer and many phones can scan for extended advertising. Please check your phone capability. 

7571.central_hr_coded_universal.zip

0537.peripheral_hr_coded_extended.zip

[Ashishsult]

Hi Hung,

Thanks for the code and verification. I see I have the same output. However to understand it better with compare to periodic_adv example, I see we need to add filtering using bt_scan_filter_add() and you added it based on UUID.

So, I have one question:

1) Why do we need this filtering? Is it not possible to get a message call back for all the messages received by this device? And can we just send the BT_DATA(BT_DATA_MANUFACTURER_DATA, mfg_data, 40) in the advertisement (similar to periodic_adv example) without the filtering?

[Hung Bui]

Hi Ashish, 

The scan filter was there in the original code so I didn't modify it. The reason I kept the filter code is that there are many advertisers in my work so I need some filter otherwise I won't be able to see the advertising packet I want to see. 

If you don't plan to use a filter you can use "scan_filter_no_match" callback. 
I have a blog post here that you may want to have a look. Quoted from the blog: 

If you are scanning without filter, then you need to define a "scan_filter_no_match" callback and you will receive a call back for every single advertising packet received. 

[Ashishsult]

Hi Hung,

I worked with your code and this works fine.

However, when I want to use Zephyr Controller by enabling CONFIG_BT_LL_SW_SPLIT=y

The device is unable to start the scan and fails at bt_hci_cmd_send_sync() returning -EIO.

Is there a way I can use the Zephyr controller enabled scanner?

[Hung Bui]

Hi Ashish, 
As far as I know, the Zephyr Controller doesn't fully support extended advertising. So using Nordic's controller would be the only option for now.