Packets are dropped to Bluetooth LE applications in Windows 8.1

Symptoms

You have more than one Bluetooth Low Energy (LE) application on a computer that is running Windows 8.1. If these applications contend for the same Bluetooth LE device, some packets to the Bluetooth LE applications may be dropped.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have Windows 8.1 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 8.1 file information and notesImportant Windows 8.1 and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows Blue RTM" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Blue RTM" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.16xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8.1" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Bthleenum.sys

6.3.9600.16481

186,880

04-Dec-2013

16:24

x86

Windows.devices.bluetooth.dll

6.3.9600.16481

439,808

04-Dec-2013

14:19

x86

For all supported x64-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Bthleenum.sys

6.3.9600.16481

226,304

04-Dec-2013

18:41

x64

Windows.devices.bluetooth.dll

6.3.9600.16481

660,480

04-Dec-2013

15:54

x64

Windows.devices.bluetooth.dll

6.3.9600.16481

439,808

04-Dec-2013

14:19

x86

For all supported ARM-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Bthleenum.sys

6.3.9600.16481

159,744

04-Dec-2013

14:11

Not Applicable

Windows.devices.bluetooth.dll

6.3.9600.16481

468,480

04-Dec-2013

12:31

Not Applicable


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

Bluetooth LE applications usually register for events and also enable notifications when they start. These same applications also disable notifications and unregister for events. This fix does not automatically prevent event notifications from being disabled by one application when other applications are still waiting for the notification events.

To prevent this problem, Win32 desktop software developers should consider opening the Bluetooth LE device by using the exclusive access flag so that one application can lock out other applications from accessing the device.

Applications that are written for Windows 8.1 are prevented from concurrently opening the same Bluetooth LE device. This problem affects only earlier versions of applications.

Additional file information for Windows 8.1

Additional files for all supported x86-based versions of Windows 8.1

File name

X86_bthleenum.inf_31bf3856ad364e35_6.3.9600.16481_none_205b615974105b05.manifest

File version

Not Applicable

File size

2,116

Date (UTC)

04-Dec-2013

Time (UTC)

19:28

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

X86_ec8a2eab5be59cb6d178112cf1bea47c_31bf3856ad364e35_6.3.9600.16481_none_802b2884d86e0895.manifest

File version

Not Applicable

File size

705

Date (UTC)

05-Dec-2013

Time (UTC)

05:36

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

X86_microsoft-windows-devices-bluetooth_31bf3856ad364e35_6.3.9600.16481_none_d60d4135fb7af846.manifest

File version

Not Applicable

File size

28,072

Date (UTC)

04-Dec-2013

Time (UTC)

19:28

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

Additional files for all supported x64-based versions of Windows 8.1

File name

Amd64_7c50d5d9d14b5846d112d3cc5b2516b5_31bf3856ad364e35_6.3.9600.16481_none_10e3f7abd3e0f37b.manifest

File version

Not Applicable

File size

709

Date (UTC)

05-Dec-2013

Time (UTC)

05:37

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Amd64_bthleenum.inf_31bf3856ad364e35_6.3.9600.16481_none_7c79fcdd2c6dcc3b.manifest

File version

Not Applicable

File size

2,120

Date (UTC)

04-Dec-2013

Time (UTC)

21:58

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Amd64_e9d1b530b431e92df9809eaa139fe4a5_31bf3856ad364e35_6.3.9600.16481_none_00b8d0b1ae3fdf8b.manifest

File version

Not Applicable

File size

709

Date (UTC)

05-Dec-2013

Time (UTC)

05:37

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Amd64_microsoft-windows-devices-bluetooth_31bf3856ad364e35_6.3.9600.16481_none_322bdcb9b3d8697c.manifest

File version

Not Applicable

File size

28,076

Date (UTC)

04-Dec-2013

Time (UTC)

21:57

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Wow64_microsoft-windows-devices-bluetooth_31bf3856ad364e35_6.3.9600.16481_none_3c80870be8392b77.manifest

File version

Not Applicable

File size

28,076

Date (UTC)

04-Dec-2013

Time (UTC)

19:27

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

Additional files for all supported ARM-based versions of Windows 8.1

File name

Arm_bthleenum.inf_31bf3856ad364e35_6.3.9600.16481_none_205dd3b1740d79cb.manifest

File version

Not Applicable

File size

2,116

Date (UTC)

04-Dec-2013

Time (UTC)

15:51

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Arm_e193a73679a8a7cd6d351dd27ffa1d43_31bf3856ad364e35_6.3.9600.16481_none_6ef59bce6d0de6cb.manifest

File version

Not Applicable

File size

705

Date (UTC)

05-Dec-2013

Time (UTC)

05:36

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable

File name

Arm_microsoft-windows-devices-bluetooth_31bf3856ad364e35_6.3.9600.16481_none_d60fb38dfb78170c.manifest

File version

Not Applicable

File size

28,072

Date (UTC)

04-Dec-2013

Time (UTC)

15:50

SHA-1 hash

Not Applicable

MD5 hash

Not Applicable


References

See the terminology Microsoft uses to describe software updates for more information.

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