Linux-enabled BLE HID peripheral

Question

I am trying to develop a BLE HID peripheral that can be used on Ubuntu 24.04. 
 
 When I try to connect the peripheral_hids_mouse example to a Linux machine, it immediately disconnects and becomes unusable. 
 Is there any sample code that has been confirmed to work with Linux machines? Or is this a problem specific to my environment? 
 
 I am using nRF52840DK and NCS 3.0.2. 
 The host Linux machine is a Lenovo ThinkPad T14s. It works fine with other Logitech devices.

DX_HK · Accepted Answer

I thought about it for a bit... 
 peripheral_hids_mouse sample performs MITM authentication by displaying a key on the mouse device. 
 However, mouse generally do not have the ability to display text. Linux machines also assume this, 
 so I think they are configured not to perform MITM authentication with mice. 
 It should probably work if you change the settings on your Linux machine and enable MITM regardless of the device. Fundamentally, the specification of peripheral_hids_mouse is probably incorrect.

DX_HK · Answer

After further testing, I found that setting CONFIG_BT_CTLR_PHY_2M=n enabled connection. According to a comment from zmk user, setting CONFIG_BT_CTLR_PHY_2M=n in Windows 11 also seems to resolve connection issues.

DX_HK · Answer

Erasing the board makes no difference. I have also confirmed that there is no pair information using bluetoothctrl on a Linux machine. 
 To check that the DK buttons are not malfunctioning, I set it to output a log when num_comp_reply() is called, but there is no sign of a malfunction. 
 
 Setting up the sniffer takes some time, so I tested it using Bluetooth Standalone.

Also, my setup is a standard development kit and sample code, except for the Linux host machine. The Linux machine (T14s gen2, Ubuntu 24.04) is also a very standard environment. Would it be possible for Nordic to test it?

Linux-enabled BLE HID peripheral

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