Cannot pair from Monterey (12.6) to iOS (16.2) device using blueutil

[navinkumarr]

Pairing from Mac OS to iPhone is failing.

version details

blueutil - 2.9.0
iOS - 16.2
Mac OS - Monterey 12.6

Steps

I am able to find the bluetooth address using below command

~ blueutil --inquiry 30 
2023-03-18 17:37:59.638 blueutil[30590:5101295] -[IOBluetoothDeviceInquiry initWithDelegate:] -  0x600002ce0030
address: 38-65-b2-cf-57-95, not connected, not favourite, not paired, name: "iPhone (65)", recent access date: 2023-03-18 12:08:12 +0000
2023-03-18 17:38:12.728 blueutil[30590:5101295] -[IOBluetoothDeviceInquiry dealloc] -  0x600002ce0030

On running pairing command I get pairing popup in iPhone with the same display number as prompted by blueutil.
I clicked on pairing popup on the iPhone on Pair option and entered yes on terminal, but I am getting below error after that.

 ~ blueutil --pair 38-65-b2-cf-57-95
Does "iPhone (65)" (38-65-b2-cf-57-95) display number 809842 (yes/no)? yes
2023-03-18 17:39:45.540 blueutil[30660:5102044] -[IOBluetoothDevicePair peerPairingCompleted:withError:]: Calling connectionComplete on IOBluetoothDevicePair. Status: 31
Failed to pair "38-65-b2-cf-57-95" with error 0x1f (Unspecified Error)

After doing some search found one thread where they recommended to pass 0000 as the pin but that didn't work as well.

~ blueutil --pair 38-65-b2-cf-57-95 0000
Does "iPhone (65)" (38-65-b2-cf-57-95) display number 892102 (yes/no)? yes
2023-03-18 17:41:04.219 blueutil[30740:5102779] -[IOBluetoothDevicePair peerPairingCompleted:withError:]: Calling connectionComplete on IOBluetoothDevicePair. Status: 31
Failed to pair "38-65-b2-cf-57-95" with error 0x1f (Unspecified Error)

On iPhone I get a pop up with message

Pairing Unsuccessful
iPhone can no longer connect to "MacBook Name".
Forget this device and pair it again.

[toy]

Thank you for reporting.
I'm wondering about the presence of log messages with bluetooth framework calls.
This may be the not yet resolved issue with later versions of OS (see comment in previous report).

[mayank2498]

@toy
I tried this macOS app : https://apps.apple.com/us/app/keypad-bluetooth-keyboard/id1491684442?mt=12
It is able to establish bluetooth connection to an iOS device from Monterey 12.6.

Any pointers using which we can fix the issue in this repo, happy to create a PR for the same.

[toy]

@mayank2498 For some time I have a hunch that one possible difficulty comes from blueutil being a CLI tool and something not done expectedly for bluetooth framework that is given for GUI app, but that is a hunch, so I don't have an understanding where to dig.
Another idea is about permissions, maybe worth checking which does that app get, maybe that will give an idea.