Add reconnect attempt timer after BT40Device unexpected disconnect (#4812)

Add reconnect attempt timer every 5s after BT40Device unexpected disconnect

src/Train/BT40Device.cpp

@@ -83,6 +83,11 @@ BT40Device::BT40Device(QObject *parent, QBluetoothDeviceInfo devinfo) : parent(p
     wheelSize = 2100;
     has_power = false;
     has_controllable_service = false;
+    
+    reconnectTimer = new QTimer(this);
+    reconnectTimer->setInterval(5000); // 5 seconds
+    connect(reconnectTimer, SIGNAL(timeout()), this, SLOT(attemptReconnect()));
+    reconnectAttempts = 0;
 }
 
 BT40Device::~BT40Device()
@@ -105,6 +110,8 @@ BT40Device::disconnectDevice()
 {
     qDebug() << "Disconnecting from device" << m_currentDevice.name() << " " << m_currentDevice.deviceUuid();
     connected = false;
+    reconnectTimer->stop();
+    reconnectAttempts = 0;
     m_control->disconnectFromDevice();
 }
 
@@ -112,6 +119,14 @@ void
 BT40Device::deviceConnected()
 {
     qDebug() << "Connected to device" << m_currentDevice.name() << " " << m_currentDevice.deviceUuid();
+    
+    // Stop reconnection timer if it's running
+    if (reconnectTimer->isActive()) {
+        reconnectTimer->stop();
+        reconnectAttempts = 0;
+        emit setNotification(tr("Reconnected to %1").arg(m_currentDevice.name()), 3);
+    }
+    
     m_control->discoverServices();
 }
 
@@ -168,7 +183,10 @@ BT40Device::deviceDisconnected()
 
     // Try to reconnect if the connection was lost inadvertently
     if (connected) {
-        this->connectDevice();
+        reconnectAttempts = 0;
+        emit setNotification(tr("Lost connection to %1, attempting to reconnect...").arg(m_currentDevice.name()), 3);
+        reconnectTimer->start();
+        attemptReconnect(); // Try immediately first
     }
 }
 
@@ -892,6 +910,23 @@ BT40Device::serviceError(QLowEnergyService::ServiceError e)
     }
 }
 
+void
+BT40Device::attemptReconnect()
+{
+    if (!connected) {
+        // User manually disconnected, stop trying
+        reconnectTimer->stop();
+        reconnectAttempts = 0;
+        return;
+    }
+    
+    reconnectAttempts++;
+    qDebug() << "Reconnection attempt" << reconnectAttempts << "for device" << m_currentDevice.name();
+    emit setNotification(tr("Reconnecting to %1 (attempt %2)...").arg(m_currentDevice.name()).arg(reconnectAttempts), 3);
+    
+    this->connectDevice();
+}
+
 void
 BT40Device::confirmedDescriptorWrite(const QLowEnergyDescriptor &d, const QByteArray &value)
 {

src/Train/BT40Device.h

@@ -23,6 +23,7 @@
 #include <QLowEnergyController>
 #include <QLowEnergyService>
 #include <QQueue>
+#include <QTimer>
 
 #include "CalibrationData.h"
 #include "Ftms.h"
@@ -74,6 +75,7 @@ private slots:
     void confirmedCharacteristicWrite(const QLowEnergyCharacteristic &c, 
                                       const QByteArray &value);
     void serviceError(QLowEnergyService::ServiceError e);
+    void attemptReconnect();
 
 signals:
     void setNotification(QString msg, int timeout);
@@ -112,6 +114,8 @@ private:
     FtmsDeviceInformation ftmsDeviceInfo;
 
     bool connected;
+    QTimer *reconnectTimer;
+    int reconnectAttempts;
     void getCadence(QDataStream& ds);
     void getWheelRpm(QDataStream& ds);
     void setLoadErg(double);