The Bluetooth API provides connectivity between Bluetooth enabled devices.
Currently, the API is supported on the following platforms:
|Linux (BlueZ 5.x)
|Qt for Windows
|Bluetooth LE Central
|Bluetooth LE Peripheral
|Bluetooth LE Advertisement & Scanning
Bluetooth is a short-range (less than 100 meters) wireless technology. It has a reasonably high data transfer rate of 2.1 Mbit/s, which makes it ideal for transferring data between devices. Bluetooth connectivity is based on basic device management, such as scanning for devices, gathering information about them, and exchanging data between them.
Qt Bluetooth supports Bluetooth Low Energy development for client/central role use cases. Further details can be found in the Bluetooth Low Energy Overview section.
find_package() command to locate the needed module components in the
find_package(Qt6 COMPONENTS Bluetooth REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Bluetooth)
See also the Build with CMake overview.
bluetooth to the
QT += bluetooth
Despite the fact that the module can be built for all Qt platforms, the module is not ported to all of them. Not supported platforms employ a fake or dummy backend which is automatically selected when the platform is not supported. The dummy backend reports appropriate error messages and values which allow the Qt Bluetooth developer to detect at runtime that the current platform is not supported. The dummy backend is also selected on Linux if BlueZ development headers are not found during build time or Qt was built without Qt D-Bus support.
The usage of the dummy backend is highlighted via an appropriate warning while building and running.
The Bluetooth API on macOS requires a certain type of event dispatcher that in Qt causes a dependency to QGuiApplication. However, you can set the environment variable
QT_EVENT_DISPATCHER_CORE_FOUNDATION=1 to circumvent this issue.
Applications that don't use Classic Bluetooth will find a subset of QtBluetooth is available, as CoreBluetooth (Bluetooth LE) do not require either of QApplication or QGuiApplication.
|Enables logging of cross platform code path in QtBluetooth
|Enables logging of the Android implementation
|Enables logging of the BLuez/Linux implementation
|Enables logging of the iOS implementation
|Enables logging of the macOS implementation
|Enables logging of the Qt for Windows implementation
Logging categories can be used to enable additional warning and debug output for QtBluetooth. More detailed information about logging can be found in QLoggingCategory. A quick way to enable all QtBluetooth logging is to add the following line to the
Changes to Qt Bluetooth lists important changes in the module API and functionality that were done for the Qt 6 series of Qt.
Qt Bluetooth is available under commercial licenses from The Qt Company. In addition, it is available under the GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.
On Linux, Qt Bluetooth uses a separate executable,
sdpscanner, to integrate with the official Linux bluetooth protocol stack BlueZ. BlueZ is available under the GNU General Public License, version 2.
GNU General Public License v2.0 only (This does not force user code to be GPL'ed. For more info see details.)
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