peripheral_hids_keyboard only works with some hosts

[mlac]

Hi there,

I'm running the peripheral_hids_keyboard sample of the nRF Connect SDK 2.5.1 on my nRF52840-DK. After pushing button 4, advertising starts as expected, but I can only connect with some of my phones/tablets.

I can connect with:
- OnePlus 9 Pro phone running Android 13
- Huawei P20 Pro running Android 10

I can't connect with:
- MacBook Air running macOS Ventura 13.6.3 - After pressing the Connect button, a progress indicator shortly appears and then disappears.
- Huawei MediaPad M5 lite 10 tablet running Android 8.0.0 - Upon trying to pair, I get the "Pairing failed. Incorrect pairing key or the device you want to pair with is configured incorrectly" message.
- NPad-Pro tablet running Android 12 - "Pairing..." momentarily appears, then disappears.

The sample doesn't show up in the Bluetooth devices list:
- ThinkPad T520 running Windows 20 Pro 22H2

Can you reproduce such discrepancies across various hosts, and can you make them connect?

[Hung Bui]

Hi Mlac, 

Do you have any modification to the sample ? Do you use any filter accept list  ? 

Do you see any log on the NRF52 when you try to pair from those it can not connect ? 

I would suggest to try capture a sniffer trace so that we can inspect further. 

[mlac]

Hi Hung,

- As it turns out, the NPad-Pro tablet is a piece of crap that doesn't pair with any keyboard. :)
- The ThinkPad T520 doesn't list other BLE keyboards either. I think it has a Bluetooth classic module that doesn't support BLE.
- The Huawei MediaPad M5 lite 10 tablet actually works with the peripheral_hids_keyboard sample. I'm unsure why it didn't work the last time.

This leaves us with the MacBook Air running macOS Ventura 13.6.3. When trying to connect, I can see the following in the console:

Connected 10:B5:88:72:9A:E6 (public)
W: Ignoring data for unknown channel ID 0x003a
Disconnected from 10:B5:88:72:9A:E6 (public) (reason 19)

Does the above ring a bell? (I've installed the sniffer, but filtering the device seems a bit tricky. I can try to capture a trace if still needed.)

Thanks for everything!

[isimon]

Thanks mlac , will try the suggestion and will report it back. Does it work for you even on Android and iPhone?

[mlac]

It works on Android. I don't have an iPhone.

[isimon]

mlac sorry for bothering  you but I'm really new to this environment...trying to implement Hung answer I look for CONFIG_NFC_OOB_PAIRING in the example but I don't see where is it defined

Could you please help me or else sending me the code you have working properly?

Many thanks in advance 

[mlac]

You have to learn Zephyr fundamentals, like Kconfig, which is needed for this. I've also worked my way through the Zephyr / nRF SDK / Bluetooth documentation over the course of months. I'm sorry, but I'm too busy nowadays.

[isimon]

mlac many thanks, good luck with your projects.