SDK 16: Get Device Name from Advertising Data

RE: SDK 16: Get Device Name from Advertising Data

Sigurd — Fri, 17 Jan 2020 12:03:49 GMT

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229384"]So what is the point of ble_advdata_parse() ? It doesn't seem very useful to know where a thing is without also knowing its length ?[/quote]

It seems to be used by the function flags_set() in the advertising module in order to simply replace a flag value if it's present.

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229384"]I guess I could check that from 'type' field in the advertising report event?[/quote]

Correct. The scan_response will then be set.

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229384"]Does the Scan module always do filtering on Scan Response as well as Advertising ?[/quote]

I don't think it does any filtering on this.

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229439"]actually, that example seems to be doing what I was trying to achieve anyhow [/quote]

Great!

RE: SDK 16: Get Device Name from Advertising Data

awneil — Thu, 16 Jan 2020 14:41:54 GMT

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]Take a look at ... \examples\ble_central_and_peripheral\experimental\ble_app_interactive[/quote]

actually, that example seems to be doing what I was trying to achieve anyhow - list devices currently advertising, and pick one to connect to.

🙂

the connection drops immediately with reason 0x3E

😞

but that's another issue ...

RE: SDK 16: Get Device Name from Advertising Data

awneil — Thu, 16 Jan 2020 10:41:16 GMT

Thanks

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]The second BLE_GAP_EVT_ADV_REPORT is most likely the scan response[/quote]

I guess I could check that from 'type' field in the advertising report event?

Does the Scan module always do filtering on Scan Response as well as Advertising ?

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]I think the logic in the last if-else should be swithced[/quote]

Oops - I think you're right there!

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]better to use ble_advdata_search() [/quote]

Having been fiddling with this since the OP, that's the conclusion I was coming to.

So what is the point of ble_advdata_parse() ? It doesn't seem very useful to know where a thing is without also knowing its length ?

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]if you are using deferred processing for the logger module, you should use nrf_log_push() [/quote]

Will check that ...

[quote userid="15146" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data/229381"]Take a look at how it's done in e.g. device_to_list_add() [/quote]

... and that

RE: SDK 16: Get Device Name from Advertising Data

Sigurd — Thu, 16 Jan 2020 10:28:09 GMT

Hi,

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data"]why is it giving two BLE_GAP_EVT_ADV_REPORT events[/quote]

The second BLE_GAP_EVT_ADV_REPORT is most likely the scan response packet.

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data"]and neither finds the Name properly[/quote]

I think the logic in the last if-else should be swithced. I.e.

            if( NULL == device_name )
            {
                NRF_LOG_INFO( "No Name" );
            }
            else
            {
                NRF_LOG_INFO( p_msg, device_name );
            }

Also, if you are using deferred processing for the logger module, you should use nrf_log_push() to copy the string into the logger buffer. See this link.

NRF_LOG_INFO( p_msg, NRF_LOG_PUSH(device_name));

It might also be better to use ble_advdata_search() instead of ble_advdata_parse(), since you also get the length of the name with ble_advdata_search(). Take a look at how it's done in e.g. device_to_list_add() function in file ble_m.c found in \examples\ble_central_and_peripheral\experimental\ble_app_interactive

RE: SDK 16: Get Device Name from Advertising Data

awneil — Wed, 15 Jan 2020 12:16:58 GMT

[quote userid="6462" url="~/f/nordic-q-a/56558/sdk-16-get-device-name-from-advertising-data"]This seems to have changed in recent SDKs, so that none of the examples or techniques mentioned in previous posts is relevant any more.[/quote]

For example:

https://devzone.nordicsemi.com/f/nordic-q-a/33994/device-name/130734#130734

shows the use of adv_report_parse() and references the ble_app_multilink_central example - but that example in SDK v16 and v15 contains no such function!

There are more recent threads asking the same question, but it is not answered; eg,

https://devzone.nordicsemi.com/f/nordic-q-a/53088/get-device-name-in-advertise-data - 3 months ago

focuses on transmitting serial data - but doesn't actually say anything about getting the device name from the Advertising Report.

The code there is pretty much what I did in the OP - it doesn't work.

https://devzone.nordicsemi.com/f/nordic-q-a/49146/get-device-name-from-filter-match-event - 7 months ago

is a different case, where the Name isn't actually in the Advertising Data.

But the code, again, looks the same - so why doesn't it work when the Name is in the Advertising Data?

https://devzone.nordicsemi.com/f/nordic-q-a/47806/getting-name-and-id-from-advertisers - 8 months ago

the part of the question about getting the device name is not answered.