Implement BLE device discovery

KeyBorad/KeyBorad/DRI/GATT/Dri_Gatt.cpp

@@ -1,8 +1,75 @@
 #include "DRI/GATT/Dri_Gatt.h"
 
+#include <QtBluetooth/QBluetoothDeviceDiscoveryAgent>
+#include <QtBluetooth/QBluetoothDeviceInfo>
+#include <QtCore/QEventLoop>
+#include <QtCore/QTimer>
+
 QVector<Dri_Gatt_Struct_PortInfo> Dri_Gatt_Enum()
 {
-    return {};
+    QVector<Dri_Gatt_Struct_PortInfo> PortList;
+
+    QBluetoothDeviceDiscoveryAgent Agent;
+    QEventLoop EventLoop;
+    QTimer TimeoutTimer;
+
+    TimeoutTimer.setSingleShot(true);
+
+    QObject::connect(
+        &Agent,
+        &QBluetoothDeviceDiscoveryAgent::deviceDiscovered,
+        [&PortList](const QBluetoothDeviceInfo& DeviceInfo)
+        {
+            if (!DeviceInfo.coreConfigurations().testFlag(
+                    QBluetoothDeviceInfo::LowEnergyCoreConfiguration))
+            {
+                return;
+            }
+
+            Dri_Gatt_Struct_PortInfo PortInfo;
+            PortInfo.DeviceName = DeviceInfo.name().trimmed();
+            PortInfo.DeviceAddress = DeviceInfo.address().toString();
+
+            if (PortInfo.DeviceAddress.trimmed().isEmpty())
+            {
+                return;
+            }
+
+            for (const Dri_Gatt_Struct_PortInfo& ExistingInfo : PortList)
+            {
+                if (ExistingInfo.DeviceAddress == PortInfo.DeviceAddress)
+                {
+                    return;
+                }
+            }
+
+            PortList.append(PortInfo);
+        });
+
+    QObject::connect(
+        &Agent,
+        &QBluetoothDeviceDiscoveryAgent::finished,
+        &EventLoop,
+        &QEventLoop::quit);
+    QObject::connect(
+        &Agent,
+        &QBluetoothDeviceDiscoveryAgent::canceled,
+        &EventLoop,
+        &QEventLoop::quit);
+    QObject::connect(
+        &TimeoutTimer,
+        &QTimer::timeout,
+        [&Agent, &EventLoop]()
+        {
+            Agent.stop();
+            EventLoop.quit();
+        });
+
+    Agent.start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);
+    TimeoutTimer.start(4000);
+    EventLoop.exec();
+
+    return PortList;
 }
 
 void Dri_Gatt_Close(Dri_Gatt_Struct_Port* p_Port)

KeyBorad/KeyBorad/KeyBorad.vcxproj

@@ -37,12 +37,12 @@
   </ImportGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'" Label="QtSettings">
     <QtInstall>D:\App\Qt\5.13.1\msvc2015_64</QtInstall>
-    <QtModules>core;serialport</QtModules>
+    <QtModules>core;serialport;bluetooth</QtModules>
     <QtBuildConfig>debug</QtBuildConfig>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'" Label="QtSettings">
     <QtInstall>D:\App\Qt\5.13.1\msvc2015_64</QtInstall>
-    <QtModules>core;serialport</QtModules>
+    <QtModules>core;serialport;bluetooth</QtModules>
     <QtBuildConfig>release</QtBuildConfig>
   </PropertyGroup>
   <Target Name="QtMsBuildNotFound" BeforeTargets="CustomBuild;ClCompile" Condition="!Exists('$(QtMsBuild)\qt.targets') or !Exists('$(QtMsBuild)\qt.props')">

docs/host_dri_rebuild.md

@@ -43,7 +43,26 @@ Implemented behavior:
 - stay transport-only
 - keep real BLE implementation for a later node
 
-### Node 2: CDC transport cleanup
+### Node 2: BLE device discovery
+
+Files updated in this step:
+
+- `KeyBorad/KeyBorad/DRI/GATT/Dri_Gatt.cpp`
+- `KeyBorad/KeyBorad/KeyBorad.vcxproj`
+
+Design notes:
+
+- use Qt Bluetooth directly
+- keep discovery synchronous for now so the first teaching step stays small
+- only collect low-energy devices
+
+Implemented behavior:
+
+- start BLE discovery with `QBluetoothDeviceDiscoveryAgent`
+- collect device name and address
+- filter to `LowEnergyCoreConfiguration`
+- stop after a short timeout
+### Node 3: CDC transport cleanup
 
 Files updated in this step: