nrf connect app for desktop

RE: nrf connect app for desktop

Karl Ylvisaker — Tue, 15 Feb 2022 10:25:38 GMT

Hello again, Ridhima

After having discussed this with some colleagues I think that the issue might be with the characteristic's configuration, since it seems that the read of the CCCD handle fails prior to the writing failing. The log also indicates that the read is unsuccessful and times out.
Could you share your characteristic's configuration?

Best regards,
Karl

RE: nrf connect app for desktop

Karl Ylvisaker — Wed, 09 Feb 2022 14:08:28 GMT

Thank you for providing both the video and the sniffer trace. I will have to discuss this with some colleagues. I will update you as soon as they get back to me.

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Tue, 08 Feb 2022 16:09:33 GMT

devzone.nordicsemi.com/.../snifer-trace.pcapng

devzone.nordicsemi.com/.../bandicam-2022_2D00_02_2D00_08-21_2D00_34_2D00_16_2D00_845.mp4

our device is 213

RE: nrf connect app for desktop

Karl Ylvisaker — Thu, 03 Feb 2022 08:27:50 GMT

[quote user="RIDHIMA"]i did reinstall the app but no change i still get NRF ERROR BUSY[/quote]

Thank you for confirming this.
Could you also re-flash the central nRF52840 DK device?
In this case we will need to look into why the central side is busy, and what else it might be doing.
In the log you provided earlier I am only able to see a sequence of READ_RSP and DISC_RSP events until it times out, but nothing about what the central is sending out.
Could you provide a sniffer trace of the communication with the device when this happens?

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Thu, 03 Feb 2022 08:18:53 GMT

Hi Karl

:Could you try to reinstall the Bluetooth Low Energy application in nRF Connect, and re-flash the nRF52840 DK that you are using on the central side, and see if this changes anything?

i did reinstall the app but no change i still get NRF ERROR BUSY

RE: nrf connect app for desktop

Karl Ylvisaker — Thu, 03 Feb 2022 08:11:05 GMT

[quote user="RIDHIMA"]I HAVE battery service, i am able to read it. [/quote]

Thank you for clarifying this.

[quote user="RIDHIMA"]when i even wait for CCCD to discover still i am not able to write in the characteristic for the second service for which i have to get notification data[/quote]

It seems to me that you are attempting to enable the notification before the CCCD characteristic has been discovered.
I am not able to reproduce this behavior on my end, unfortunately.

Could you try to reinstall the Bluetooth Low Energy application in nRF Connect, and re-flash the nRF52840 DK that you are using on the central side, and see if this changes anything?
I will ask internally if anyone else has seen the NRF_ERROR_BUSY error in the Bluetooth Low Energy application before.

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Thu, 03 Feb 2022 04:52:34 GMT

gentle reminder

RE: nrf connect app for desktop

Ridhi — Wed, 02 Feb 2022 13:49:02 GMT

I HAVE battery service, i am able to read it.

when i even wait for CCCD to discover still i am not able to write in the characteristic for the second service for which i have to get notification datadevzone.nordicsemi.com/.../bandicam-2022_2D00_02_2D00_02-19_2D00_08_2D00_25_2D00_714.mp4 devzone.nordicsemi.com/.../bandicam-2022_2D00_02_2D00_02-19_2D00_16_2D00_20_2D00_886.mp4

RE: nrf connect app for desktop

Karl Ylvisaker — Wed, 02 Feb 2022 12:59:11 GMT

Thank you for providing the videos, this makes the issue more clear.
I will try to replicate this on my end as well.

It looks to me like you attempt to enable CCCD before the CCCD characteristic is discovered, and that you also try to write to the characteristic before the discovery is complete.
What happens if you wait until it is complete before writing to the characteristic?

Please also answer:

[quote user="Karl Ylvisaker"]Could you also tell me if you are able to read and write the other services of the device, or if they all are inaccessible?[/quote]

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Wed, 02 Feb 2022 12:08:24 GMT

i have saved logs in flash memory. When i connect i just enable notify , write 11 and get the data. i nrf app for desktop also i am doing the same.devzone.nordicsemi.com/.../bandicam-2022_2D00_02_2D00_02-17_2D00_26_2D00_11_2D00_432.mp4 devzone.nordicsemi.com/.../WhatsApp-Video-2022_2D00_02_2D00_02-at-5.37.06-PM.mp4

RE: nrf connect app for desktop

Karl Ylvisaker — Wed, 02 Feb 2022 11:45:37 GMT

I have personally never seen a characteristic write retuning NRF_ERROR_BUSY on the nRF Connect desktop. This error code usually means that too many SoftDevice API calls have been issued, so that the command queue is full, however I would not expect this to be a problem on a desktop application. This supports my suspicion from earlier that the '11' value is never sent to the peripheral device, which is why you are not seeing the notifications on the nRF Connect desktop.

Please answer the questions in my previous reply, so that I may get a better understanding of what is happening in your application.

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Wed, 02 Feb 2022 11:32:20 GMT

Karl kindly help

RE: nrf connect app for desktop

Ridhi — Wed, 02 Feb 2022 10:01:01 GMT

My operation is to enable notify, write 11 and get the data

karl i am following this same process in nrf app for mobi;e in which i get the data but on nrf app for desktop m not able to get it. pls help me

RE: nrf connect app for desktop

Karl Ylvisaker — Tue, 01 Feb 2022 12:11:54 GMT

Hello again, Ridhima

Thank you for your patience with this, and thank you for providing the logs.

From your nRF Connect for desktop log it does not seem that "11" is ever written to the characteristic, like you are doing in the nRF Connect for smartphone logs.
It also seems that you connection times out eventually.

Could you detail when in the logs you attempt to do the write?
Could you also tell me if you are able to read and write the other services of the device, or if they all are inaccessible?
What does your peripheral device's log say when this occurs?

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Tue, 01 Feb 2022 08:37:35 GMT

Karl pls look into

RE: nrf connect app for desktop

Ridhi — Mon, 31 Jan 2022 18:23:39 GMT

gentle reminder

RE: nrf connect app for desktop

Ridhi — Wed, 26 Jan 2022 16:55:44 GMT

devzone.nordicsemi.com/.../2000loging-22_5F00_11_5F00_41.txt

nrf connect app for mobile

and for

nrf connect app for desktop

devzone.nordicsemi.com/.../log-file-of-nrf-connect-app-for-desktop.txt

RE: nrf connect app for desktop

Karl Ylvisaker — Wed, 26 Jan 2022 09:22:45 GMT

Thank you for clarifying.
Could you please provide the logs from both the nRF Connect for Desktop and the nRF Connect for smartphone, for the described scenario?

Best regards,
Karl

RE: nrf connect app for desktop

Ridhi — Tue, 25 Jan 2022 16:03:33 GMT

when i am enabling notify and trying to write 11 to get data i am not able to get it in nrf app for desktop but in nrf app for mobile it works perfectly fine

RE: nrf connect app for desktop

Karl Ylvisaker — Mon, 24 Jan 2022 08:15:11 GMT

Hello,

Please elaborate on what the issue is. How is the nRF Connect for desktop application working differently from the nRF Connect for smartphone application? What behavior are you observing and how does it diverge from what you would have expected?

Best regards,
Karl