BluetoothSensorManager: on initiate connect to sensor, report address to be shown on UI.

Fixes #64.

src/main/java/de/dennisguse/opentracks/content/sensor/SensorData.java

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.content.sensor;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
@@ -11,6 +13,10 @@ public class SensorData {
 
     private final long timestamp_ms;
 
+    SensorData(String sensorAddress) {
+        this(sensorAddress, null, System.currentTimeMillis());
+    }
+
     SensorData(String sensorAddress, String sensorName) {
         this(sensorAddress, sensorName, System.currentTimeMillis());
     }
@@ -22,14 +28,20 @@ public class SensorData {
         this.timestamp_ms = timestamp_ms;
     }
 
+    @NonNull
     public String getSensorAddress() {
         return sensorAddress;
     }
 
+    @Nullable
     public String getSensorName() {
         return sensorName;
     }
 
+    public String getSensorNameOrAddress() {
+        return sensorName != null ? sensorName : sensorAddress;
+    }
+
     /**
      * Is the data recent considering the current time.
      */

src/main/java/de/dennisguse/opentracks/content/sensor/SensorDataCycling.java

@@ -29,6 +29,12 @@ public final class SensorDataCycling {
         private final int crankRevolutionsTime; // UINT16; 1/1024s
         private float cadence_rpm = INVALID_VALUE_FLOAT;
 
+        public Cadence(String sensorAddress) {
+            super(sensorAddress);
+            this.crankRevolutionsCount = INVALID_VALUE_INT;
+            this.crankRevolutionsTime = INVALID_VALUE_INT;
+        }
+
         public Cadence(String sensorAddress, String sensorName, long crankRevolutionsCount, int crankRevolutionsTime) {
             super(sensorAddress, sensorName);
             this.crankRevolutionsCount = crankRevolutionsCount;
@@ -97,6 +103,12 @@ public final class SensorDataCycling {
         private final int wheelRevolutionsTime; // UINT16; 1/1024s
         private float speed_mps = INVALID_VALUE_FLOAT;
 
+        public Speed(String sensorAddress) {
+            super(sensorAddress);
+            this.wheelRevolutionsCount = INVALID_VALUE_INT;
+            this.wheelRevolutionsTime = INVALID_VALUE_INT;
+        }
+
         public Speed(String sensorAddress, String sensorName, int wheelRevolutionsCount, int wheelRevolutionsTime) {
             super(sensorAddress, sensorName);
             this.wheelRevolutionsCount = wheelRevolutionsCount;

src/main/java/de/dennisguse/opentracks/content/sensor/SensorDataHeartRate.java

@@ -6,6 +6,11 @@ public class SensorDataHeartRate extends SensorData {
 
     private final float heartRate_bpm;
 
+    public SensorDataHeartRate(String address) {
+        super(address);
+        heartRate_bpm = Float.NaN;
+    }
+
     public SensorDataHeartRate(String name, String address, float heartRate_bpm) {
         super(name, address);
         this.heartRate_bpm = heartRate_bpm;