Fix HR PID race condition with training program speed changes

The HR controller was reading the current speed, calculating an adjustment,
then firing the change. If a training program changed speed in between these
steps, the HR controller would overwrite the new speed with a stale calculation.

Solution: Track when the training program changes speed via a timestamp in
homeform. Both HR PID modes (zone-based and min/max) now skip adjustments
for the configured delta period (typically 10 seconds) after a training
program speed change, allowing the body to respond to the new speed first.

Changes:
- Add lastTrainingProgramSpeedChange timestamp member to homeform
- Add onTrainingProgramSpeedChanged() slot to record speed change timestamps
- Connect training program changeSpeed signal to the new slot
- Guard both HR PID adjustment sections with recentSpeedChange check
- Skip adjustments if a training program speed change occurred within delta seconds
- Fix indentation to match project style (cpp and header files)

Author: cysimons

.gitignore

@@ -53,4 +53,4 @@ src/inner_templates/googlemaps/cesium-key.js
 /tst/Devices/.vs
 src/inner_templates/googlemaps/cesium-key.js
 src/qdomyos-zwift.pro.user.49de507
-/.vs
+/.vs

src/homeform.cpp

@@ -1590,6 +1590,8 @@ void homeform::trainProgramSignals() {
         disconnect(trainProgram, &trainprogram::lap, this, &homeform::Lap);
         disconnect(trainProgram, &trainprogram::changeSpeed, ((treadmill *)bluetoothManager->device()),
                    &treadmill::changeSpeed);
+        disconnect(trainProgram, &trainprogram::changeSpeed, this,
+                   &homeform::onTrainingProgramSpeedChanged);
         disconnect(trainProgram, &trainprogram::changeInclination, ((treadmill *)bluetoothManager->device()),
                    &treadmill::changeInclination);
         disconnect(trainProgram, &trainprogram::changeNextInclination300Meters, bluetoothManager->device(),
@@ -1647,6 +1649,9 @@ void homeform::trainProgramSignals() {
         connect(trainProgram, &trainprogram::stop, this, &homeform::StopFromTrainProgram);
         connect(trainProgram, &trainprogram::lap, this, &homeform::Lap);
         connect(trainProgram, &trainprogram::toastRequest, this, &homeform::onToastRequested);
+        // Connect training program speed changes to reset HR PID timer
+        connect(trainProgram, &trainprogram::changeSpeed, this,
+                &homeform::onTrainingProgramSpeedChanged);
         if (bluetoothManager->device()->deviceType() == TREADMILL) {
             connect(trainProgram, &trainprogram::changeSpeed, ((treadmill *)bluetoothManager->device()),
                     &treadmill::changeSpeed);
@@ -1738,6 +1743,13 @@ void homeform::onToastRequested(QString message) {
     }
 }
 
+void homeform::onTrainingProgramSpeedChanged(double speed) {
+    // Record the timestamp when the training program changed speed
+    // This is used by the HR PID controller to avoid race conditions
+    lastTrainingProgramSpeedChange = QDateTime::currentDateTime();
+}
+
+
 QStringList homeform::tile_order() {
 
     QStringList r;
@@ -7300,6 +7312,12 @@ void homeform::update() {
 
                 if (!stopped && !paused && bluetoothManager->device()->currentHeart().value() && zone > 0 &&
                     bluetoothManager->device()->currentSpeed().value() > 0.0f) {
+                    // Skip HR PID adjustments for a period after training program changes speed
+                    // This prevents race conditions where HR PID overwrites training program speed changes
+                    qint64 msSinceSpeedChange = lastTrainingProgramSpeedChange.msecsTo(QDateTime::currentDateTime());
+                    bool recentSpeedChange = (msSinceSpeedChange < (delta * 1000));
+                    
+                    if (!recentSpeedChange) {
                     if (bluetoothManager->device()->deviceType() == TREADMILL) {
 
                         const double step = 0.2;
@@ -7411,6 +7429,7 @@ void homeform::update() {
                             ((rower *)bluetoothManager->device())->changeResistance(currentResistance + step);
                         }
                     }
+                    }  // Close the if (!recentSpeedChange) block
                 }
             }
         } else if ((settings.value(QZSettings::treadmill_pid_heart_min, QZSettings::default_treadmill_pid_heart_min)
@@ -7468,6 +7487,12 @@ void homeform::update() {
                              << QStringLiteral("HRmin:") << hrmin << QStringLiteral("HRmax:") << hrmax
                              << QStringLiteral("fromTrainProgram:") << fromTrainProgram;
 
+                    // Skip HR PID adjustments for a period after training program changes speed
+                    // This prevents race conditions where HR PID overwrites training program speed changes
+                    qint64 msSinceSpeedChange = lastTrainingProgramSpeedChange.msecsTo(QDateTime::currentDateTime());
+                    bool recentSpeedChange = (msSinceSpeedChange < (delta * 1000));
+                    
+                    if (!recentSpeedChange) {
                     if (bluetoothManager->device()->deviceType() == TREADMILL) {
 
                         const double step = 0.2;
@@ -7589,10 +7614,11 @@ void homeform::update() {
                             qDebug() << QStringLiteral("ROWING PID HR - HR < HRmin, INCREASING resistance from")
                                      << currentResistance << QStringLiteral("to") << (currentResistance + step);
                             ((rower *)bluetoothManager->device())->changeResistance(currentResistance + step);
-                        } else {
-                            qDebug() << QStringLiteral("ROWING PID HR - No action taken (in zone or at limits)");
-                        }
-                    }
+                         } else {
+                             qDebug() << QStringLiteral("ROWING PID HR - No action taken (in zone or at limits)");
+                         }
+                     }
+                    }  // Close the if (!recentSpeedChange) block
                 }
             }
         }

src/homeform.h

@@ -974,6 +974,9 @@ class homeform : public QObject {
     QTimer *backupTimer;
     QTimer *automaticShiftingTimer;
 
+    // HR PID controller state - tracks when training program changes speed to prevent race conditions
+    QDateTime lastTrainingProgramSpeedChange = QDateTime::fromMSecsSinceEpoch(0);
+
     // FIT backup threading
     QThread *fitBackupThread;
     FitBackupWriter *fitBackupWriter;
@@ -1089,6 +1092,7 @@ class homeform : public QObject {
     void saveSessionAsTrainingProgram();
     void strava_connect_clicked();
     void trainProgramSignals();
+    void onTrainingProgramSpeedChanged(double speed);
     void refresh_bluetooth_devices_clicked();
     void onStravaGranted();
     void onStravaAuthorizeWithBrowser(const QUrl &url);