How to get complete device name from another peripheral once it's connected?

RE: How to get complete device name from another peripheral once it's connected?

Mariano — Wed, 27 Feb 2019 19:38:46 GMT

Hi Andy, I was looking for a way to read the device name from the generic access service, as you made. Could you please upload the files of your central custom service? You could save me a lot of work!!

RE: How to get complete device name from another peripheral once it's connected?

Simonr — Thu, 10 Jan 2019 07:52:54 GMT

Thank you for posting your solution Andy, I will report it internally.

Best regards,

Simon

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 16:16:44 GMT

Hi Simon,

I just found out a way to get the complete name from the peripheral :) You just have to read the device name characteristic (0x2A00) in the Generic Access Service (0x1800). Apparently, there aren't any definitions for this in the ble_srv_common.h header file. I already implemented the whole thing and it works nicely.

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 14:25:36 GMT

Ok, thanks for your help :)

RE: How to get complete device name from another peripheral once it's connected?

Simonr — Tue, 08 Jan 2019 14:22:20 GMT

Hi Andy,

It is not possible to get the device name by any other means than extracting it from the advertisement data.

Kind regards

SImon

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 13:32:55 GMT

Ok, thanks. Just as a follow-up, is this because it isn't implemented in the SDK or because it's just not possible?

RE: How to get complete device name from another peripheral once it's connected?

Simonr — Tue, 08 Jan 2019 11:39:10 GMT

Hi again Andy,

I have talked to my colleagues regarding your issue, and I am sorry to report that there is no way for the central to find the device name of a connected peripheral if it was not included in the advertisement.

Best regards

Simon

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 10:38:40 GMT

What log?

RE: How to get complete device name from another peripheral once it's connected?

awneil — Tue, 08 Jan 2019 10:04:10 GMT

[quote userid="15909" url="~/f/nordic-q-a/42217/how-to-get-complete-device-name-from-another-peripheral-once-it-s-connected/164459"]I think it should be possible since my phone displays the full device name of a connected peripheral, even though the peripheral didn't advertise the complete name.[/quote]

Have you tried looking at the phone's BLE snooper log to see how it does it ... ?

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 10:02:49 GMT

I understand that. But I am developing the central application, not the peripheral. The peripherals are from third-parties and I can't modify their firmware.

That's why I'm asking how to get the device name of another peripheral, using my central device.

RE: How to get complete device name from another peripheral once it's connected?

Simonr — Tue, 08 Jan 2019 09:58:02 GMT

Hi Andy,

Sorry for the misunderstanding. The reason device names are getting cut down is likely due to data packets being too big, and therefore the device name is getting cut out. I suggest you either advertise smaller packets, or enable the data packet length extension (DLE) to provide bigger data packets per advertising event.

You can enable DLE by modifying NRF_SDH_GAP_DATA_LENGTH in sdk_config.h, or you can call the function nrf_ble_gatt_data_length_set.

Best regards,

Simon

RE: How to get complete device name from another peripheral once it's connected?

Andy — Tue, 08 Jan 2019 09:10:38 GMT

Hi Simon,

As I said in my question, I know how to get the name from the advertising data. What I want to know is how to get the name when it is not advertised.

I think it should be possible since my phone displays the full device name of a connected peripheral, even though the peripheral didn't advertise the complete name.

RE: How to get complete device name from another peripheral once it's connected?

Simonr — Tue, 08 Jan 2019 08:39:55 GMT

Hi Andy,

I suggest you take a look at the BLE Multi-link Example and the function adv_report_parse() for details on how the name can be extracted from advertising data, as advertising beacons are not required to advertise their device names.

Best regards

Simon