Add support for Yoda1 (#927)

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothFactory.java

@@ -136,6 +136,9 @@ public class BluetoothFactory {
         if (deviceName.equals("CH100")){
             return new BluetoothHuaweiAH100(context);
         }
+        if (deviceName.equals("Yoda1")){
+            return new BluetoothYoda1Scale(context);
+        }
         return null;
     }
 }

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothYoda1Scale.java

@@ -0,0 +1,109 @@
+package com.health.openscale.core.bluetooth;
+
+import android.bluetooth.le.ScanFilter;
+import android.bluetooth.le.ScanResult;
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.SparseArray;
+
+import com.health.openscale.core.OpenScale;
+import com.health.openscale.core.datatypes.ScaleMeasurement;
+import com.health.openscale.core.datatypes.ScaleUser;
+import com.health.openscale.core.utils.Converters;
+import com.welie.blessed.BluetoothCentralManager;
+import com.welie.blessed.BluetoothCentralManagerCallback;
+import com.welie.blessed.BluetoothPeripheral;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class BluetoothYoda1Scale extends BluetoothCommunication {
+
+    private BluetoothCentralManager central;
+    private final BluetoothCentralManagerCallback btCallback = new BluetoothCentralManagerCallback() {
+        @Override
+        public void onDiscoveredPeripheral(@NotNull BluetoothPeripheral peripheral, @NotNull ScanResult scanResult) {
+            SparseArray<byte[]> manufacturerSpecificData = scanResult.getScanRecord().getManufacturerSpecificData();
+            byte[] weightBytes = manufacturerSpecificData.valueAt(0);
+
+            //int featuresAndCounter = manufacturerSpecificData.keyAt(0);
+            //Timber.d("Feature: %d, Counter: %d", featuresAndCounter & 0xFF, featuresAndCounter >> 8);
+
+            final byte ctrlByte = weightBytes[6];
+
+            final boolean isStabilized = isBitSet(ctrlByte, 0);
+            final boolean isKgUnit = isBitSet(ctrlByte, 2);
+            final boolean isOneDecimal = isBitSet(ctrlByte, 3);
+
+            if (isStabilized) {
+                Timber.d("One digit decimal: %s", isOneDecimal);
+                Timber.d("Unit Kg: %s", isKgUnit);
+
+                float weight;
+
+                if (isKgUnit) {
+                    weight = (float) (((weightBytes[0] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 10.0f;
+                } else {
+                    // catty
+                    weight = (float) (((weightBytes[0] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 20.0f;
+                }
+
+                if (!isOneDecimal) {
+                    weight /= 10.0;
+                }
+
+                Timber.d("Got weight: %f", weight);
+
+                final ScaleUser selectedUser = OpenScale.getInstance().getSelectedScaleUser();
+                ScaleMeasurement scaleBtData = new ScaleMeasurement();
+
+                scaleBtData.setWeight(Converters.toKilogram(weight, selectedUser.getScaleUnit()));
+                addScaleMeasurement(scaleBtData);
+
+                disconnect();
+            }
+        }
+    };
+
+    public BluetoothYoda1Scale(Context context) {
+        super(context);
+        central = new BluetoothCentralManager(context, btCallback, new Handler(Looper.getMainLooper()));
+    }
+
+    @Override
+    public void connect(String macAddress) {
+        Timber.d("Mac address: %s", macAddress);
+        List<ScanFilter> filters = new LinkedList<ScanFilter>();
+
+        ScanFilter.Builder b = new ScanFilter.Builder();
+        b.setDeviceAddress(macAddress);
+
+        b.setDeviceName("Yoda1");
+        filters.add(b.build());
+
+        central.scanForPeripheralsUsingFilters(filters);
+    }
+
+    @Override
+    public void disconnect() {
+        if (central != null)
+            central.stopScan();
+        central = null;
+        super.disconnect();
+    }
+
+    @Override
+    public String driverName() {
+        return "Yoda1 Scale";
+    }
+
+    @Override
+    protected boolean onNextStep(int stepNr) {
+        return false;
+    }
+}