Windows.Devices.Radios.StateChanged and BluetoothDevice.ConnectionStatusChanged events not triggering sometimes

Jis N George 0

I am developing a background service that communicates with a Bluetooth device. I have subscribed to Radio.StateChanged event of Radio object and it triggers fine when Bluetooth radio gets On / Off. But sometimes, that event is not triggering - that too under normal scenarios. Also, the BluetoothRadio.ConnectionStatusChanged event is also misbehaving sometimes. Sometimes when device is connected and Bluetooth radio is turned off, Radio.StateChanged triggers, but ConnectionStatusChanged won't trigger. Other times, both events won't trigger.

What could be the reason these events misbehave sometimes? Is there any better way that I could detect change in Bluetooth radio state and connection status?

Thanks

Junjie Zhu - MSFT 16,391 Reputation points Microsoft Vendor

2023-12-04T08:54:47.9866667+00:00

Hi @Jis N George Welcome to Microsoft Q&A!

Can this behavior be reproduced on other devices? Could you please share your debug output log to help us further check the problem for you?

Thank you.
Jis N George 0 Reputation points

2023-12-05T06:59:11.67+00:00

Hi Junjie Zhu,

There is no specific procedure I can tell to reproduce this issue. I have spotted this issue in 2 devices. In those devices, only sometimes this issue occur.

This is my event handler. The only log that I have is when event handler executes, but when event don't trigger, I don't have the log.
Junjie Zhu - MSFT 16,391 Reputation points Microsoft Vendor

2023-12-07T03:07:58.1666667+00:00

Hi @Jis N George,

I tested the event but couldn't reproduce. Could you please provide more information to help us further check the problem for you?
What operating systems are installed in your two computers, and what Bluetooth radio exists (Intel or something else, is the Bluetooth radio internal or external)?

Thank you.
Junjie Zhu - MSFT 16,391 Reputation points Microsoft Vendor

2023-12-15T07:54:18.2533333+00:00

Hi @Jis N George,

Any updates?
Jis N George 0 Reputation points

2023-12-18T06:16:10.15+00:00

Hi Junjie Zhu,

Sorry for the delay to respond. The devices I have tested were a Panasonic ToughBook CF-33 (Windows 10) and ThinkPad T15p Gen2 (Windows 11). Both have Intel Bluetooth radios and are internal.
The issue I see rarely occurs, but if it occur it affects the entire functioning of my service.
Junjie Zhu - MSFT 16,391 Reputation points Microsoft Vendor

2023-12-18T10:01:40.67+00:00

Hi @Jis N George,

How often does it usually appear? If this is sporadic behavior, it's more difficult to troubleshoot.
Jis N George 0 Reputation points

2023-12-19T08:27:50.56+00:00

This behavior occurs rarely.
Junjie Zhu - MSFT 16,391 Reputation points Microsoft Vendor

2023-12-19T09:40:25.24+00:00

Hi @Jis N George,

To better troubleshoot, could you please collect Bluetooth logs according to this document?

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Windows.Devices.Radios.StateChanged and BluetoothDevice.ConnectionStatusChanged events not triggering sometimes