Heartrate: ignore "0" if sent from sensor as this is an invalid value.

On import "0" is ignored.

src/main/java/de/dennisguse/opentracks/sensors/driver/HeartRateBluetooth.java

@@ -1,6 +1,7 @@
 package de.dennisguse.opentracks.sensors.driver;
 
 import android.bluetooth.BluetoothGattCharacteristic;
+import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
@@ -13,6 +14,8 @@ import de.dennisguse.opentracks.sensors.ServiceMeasurementUUID;
 
 public class HeartRateBluetooth implements BluetoothDriver.BluetoothParser<HeartRate> {
 
+    private static final String TAG = BluetoothHandlerManagerHeartRate.class.getSimpleName();
+
     public static final ServiceMeasurementUUID HEARTRATE = new ServiceMeasurementUUID(
             new UUID(0x180D00001000L, 0x800000805f9b34fbL),
             new UUID(0x2A3700001000L, 0x800000805f9b34fbL)
@@ -35,7 +38,16 @@ public class HeartRateBluetooth implements BluetoothDriver.BluetoothParser<Heart
 
     @Override
     public HeartRate parsePayload(@NonNull ServiceMeasurementUUID serviceMeasurementUUID, String sensorName, BluetoothGattCharacteristic characteristic) {
-        return parseHeartRate(characteristic);
+        HeartRate heartRate = parseHeartRate(characteristic);
+
+        if (heartRate == null) return null;
+
+        if (heartRate.value() == 0.0) {
+            Log.d(TAG, "Invalid heartrate received. Ignoring.");
+            return null;
+        }
+
+        return heartRate;
     }
 
     @VisibleForTesting

src/main/java/de/dennisguse/opentracks/sensors/sensorData/AggregatorHeartRate.java

@@ -10,8 +10,6 @@ public class AggregatorHeartRate extends Aggregator<HeartRate, HeartRate> {
 
     @Override
     protected void computeValue(Raw<HeartRate> current) {
-        if (current.value().isValid()) {
-            this.output = current.value();
-        }
+        this.output = current.value();
     }
 }