Provide a way to define GAP/GATT services for central roles

Some devices require the Generic Access (GAP) and Generic Attribute (GATT)
services to be defined. Otherwise they refuse a proper interaction.
This is done implicitly by Android and BlueZ. The reason why BlueZ does
not do this for QtBluetooth is because QtBluetooth sets up its own GATT
infrastructure.

Normally a QLEController in central role cannot do that via public API
as the QLEController::addService() function blocks on peripheral use
cases. This patch sets the profiles up.

In the future the feature really requires a better form of API
(beyond the above env variable) or should be enabled by default
but since we need this earlier than Qt 5.10 a more subtle
approach was chosen. For now the feature can
only be enabled if the QT_DEFAULT_CENTRAL_SERVICES was set.

Another limitation is that the characteristics of the added services
are completely static.

Task-number: QTBUG-61554
Change-Id: Id03bddb2e54cc4f0869838e13ddf281311ad3a26
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/bluetooth/qlowenergycontroller_p.h b/src/bluetooth/qlowenergycontroller_p.h
index 5811376b..5c680c3b 100644
--- a/src/bluetooth/qlowenergycontroller_p.h
+++ b/src/bluetooth/qlowenergycontroller_p.h
@@ -147,6 +147,8 @@ public:
             QLowEnergyHandle handle);
     QLowEnergyDescriptor descriptorForHandle(
             QLowEnergyHandle handle);
+    QLowEnergyService *addServiceHelper(const QLowEnergyServiceData &service);
+
 
     quint16 updateValueOfCharacteristic(QLowEnergyHandle charHandle,
                                      const QByteArray &value,
@@ -416,6 +418,7 @@ private:
 
     void restartRequestTimer();
     void establishL2cpClientSocket();
+    void createServicesForCentralIfRequired();
 
 private slots:
     void l2cpConnected();