add basic Yunmai Mini scale support (currently only weight and fat)

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

@@ -38,7 +38,7 @@ public abstract class BluetoothCommunication {
         BT_CONNECTION_LOST, BT_NO_DEVICE_FOUND, BT_UNEXPECTED_ERROR, BT_SCALE_MESSAGE
     };
     public enum BT_MACHINE_STATE {BT_INIT_STATE, BT_CMD_STATE, BT_CLEANUP_STATE}
-    public enum BT_DEVICE_ID {CUSTOM_OPENSCALE, MI_SCALE_V1, SANITAS_SBF70, MEDISANA_BS444, DIGOO_DGS038H, EXCELVANT_CF369BLE}
+    public enum BT_DEVICE_ID {CUSTOM_OPENSCALE, MI_SCALE_V1, SANITAS_SBF70, MEDISANA_BS444, DIGOO_DGS038H, EXCELVANT_CF369BLE, YUNMAI_MINI}
 
     protected Context context;
 
@@ -89,6 +89,8 @@ public abstract class BluetoothCommunication {
                 return new BluetoothDigooDGSO38H(context);
             case EXCELVANT_CF369BLE:
                 return new BluetoothExcelvanCF369BLE(context);
+            case YUNMAI_MINI:
+                return new BluetoothYunmaiMini(context);
         }
 
         return null;

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

@@ -0,0 +1,162 @@
+/* Copyright (C) 2017  olie.xdev <olie.xdev@googlemail.com>
+*
+*    This program is free software: you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation, either version 3 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package com.health.openscale.core.bluetooth;
+
+import android.bluetooth.BluetoothGatt;
+import android.bluetooth.BluetoothGattCharacteristic;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+
+import com.health.openscale.core.OpenScale;
+import com.health.openscale.core.datatypes.ScaleData;
+import com.health.openscale.core.datatypes.ScaleUser;
+
+import java.util.Date;
+import java.util.Random;
+import java.util.UUID;
+
+public class BluetoothYunmaiMini extends BluetoothCommunication {
+    private final UUID WEIGHT_MEASUREMENT_SERVICE = UUID.fromString("0000ffe0-0000-1000-8000-00805f9b34fb");
+    private final UUID WEIGHT_MEASUREMENT_CHARACTERISTIC = UUID.fromString("0000ffe4-0000-1000-8000-00805f9b34fb");
+    private final UUID WEIGHT_CMD_SERVICE = UUID.fromString("0000ffe5-0000-1000-8000-00805f9b34fb");
+    private final UUID WEIGHT_CMD_CHARACTERISTIC = UUID.fromString("0000ffe9-0000-1000-8000-00805f9b34fb");
+
+    private final UUID WEIGHT_MEASUREMENT_CONFIG = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
+
+    public BluetoothYunmaiMini(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String deviceName() {
+        return "Yunmai Mini";
+    }
+
+    @Override
+    public String defaultDeviceName() {
+        return "YUNMAI-SIGNAL-M1US";
+    }
+
+    @Override
+    public boolean checkDeviceName(String btDeviceName) {
+        if (btDeviceName.startsWith("YUNMAI-SIGNAL-M")) {
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    boolean nextInitCmd(int stateNr) {
+        switch (stateNr) {
+            case 0:
+                int user_id = getUniqueNumber();
+
+                final ScaleUser selectedUser = OpenScale.getInstance(context).getSelectedScaleUser();
+                byte sex = selectedUser.isMale() ? (byte)0x01 : (byte)0x02;
+                byte display_unit = selectedUser.scale_unit == 0 ? (byte) 0x01 : (byte) 0x02;
+
+                byte[] user_add_or_query = new byte[]{(byte)0x0d, (byte)0x12, (byte)0x10, (byte)0x01, (byte)0x00, (byte) 0x00, (byte) ((user_id & 0xFF00) >> 8), (byte) ((user_id & 0xFF) >> 0), (byte)selectedUser.body_height, (byte)sex, (byte) selectedUser.getAge(), (byte) 0x55, (byte) 0x5a, (byte) 0x00, (byte)0x00, (byte) display_unit, (byte) 0x03, (byte) 0x00 };
+                user_add_or_query[17] = xor_checksum(user_add_or_query);
+                writeBytes(WEIGHT_CMD_SERVICE, WEIGHT_CMD_CHARACTERISTIC, user_add_or_query);
+                break;
+            case 1:
+                setNotificationOn(WEIGHT_MEASUREMENT_SERVICE, WEIGHT_MEASUREMENT_CHARACTERISTIC, WEIGHT_MEASUREMENT_CONFIG);
+                break;
+            case 2:
+                byte[] magic_bytes = new byte[]{(byte)0x0d, (byte)0x05, (byte)0x13, (byte)0x00, (byte)0x16};
+                writeBytes(WEIGHT_CMD_SERVICE, WEIGHT_CMD_CHARACTERISTIC, magic_bytes);
+                break;
+            default:
+                return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    boolean nextBluetoothCmd(int stateNr) {
+        return false;
+    }
+
+    @Override
+    boolean nextCleanUpCmd(int stateNr) {
+        return false;
+    }
+
+    @Override
+    public void onBluetoothDataChange(BluetoothGatt bluetoothGatt, BluetoothGattCharacteristic gattCharacteristic) {
+        final byte[] data = gattCharacteristic.getValue();
+
+        if (data != null && data.length > 0) {
+
+            // if finished weighting?
+            if (data[3] == 0x02) {
+                parseBytes(data);
+            }
+        }
+    }
+
+    private void parseBytes(byte[] weightBytes) {
+        long unix_timestamp = ((weightBytes[5] & 0xFF) << 24) | ((weightBytes[6] & 0xFF) << 16) | ((weightBytes[7] & 0xFF) << 8) | (weightBytes[8] & 0xFF);
+        Date btDate = new Date();
+        btDate.setTime(unix_timestamp*1000);
+
+        float weight = (float) (((weightBytes[13] & 0xFF) << 8) | (weightBytes[14] & 0xFF)) / 100.0f;
+        float fat = (float)(((weightBytes[17] & 0xFF) << 8) | (weightBytes[18] & 0xFF)) / 100.0f;
+
+        ScaleData scaleBtData = new ScaleData();
+
+        final ScaleUser selectedUser = OpenScale.getInstance(context).getSelectedScaleUser();
+
+        scaleBtData.setConvertedWeight(weight, selectedUser.scale_unit);
+        scaleBtData.setFat(fat);
+        scaleBtData.setDateTime(btDate);
+
+        addScaleData(scaleBtData);
+    }
+
+    private int getUniqueNumber() {
+        int uniqueNumber;
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        uniqueNumber = prefs.getInt("uniqueNumber", 0x00);
+
+        if (uniqueNumber == 0x00) {
+            Random r = new Random();
+            uniqueNumber = r.nextInt(65535 - 100 + 1) + 100;
+
+            prefs.edit().putInt("uniqueNumber", uniqueNumber).commit();
+        }
+
+        int userId = prefs.getInt("selectedUserId", -1);
+
+        return uniqueNumber + userId;
+    }
+
+    private byte xor_checksum(byte[] data) {
+        byte checksum = 0x00;
+
+        for (int i=0; i<data.length-1; i++) {
+            checksum ^= data[i];
+        }
+
+        return checksum;
+    }
+}

android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java

@@ -105,12 +105,12 @@ public class DataEntryActivity extends Activity {
         waterMeasurement = new WaterMeasurementView(context);
         muscleMeasurement = new MuscleMeasurementView(context);
         fatMeasurement = new FatMeasurementView(context);
+        boneMeasurementView = new BoneMeasurementView(context);
         waistMeasurement = new WaistMeasurementView(context);
         wHtRMeasurementView = new WHtRMeasurementView(context);
         hipMeasurement = new HipMeasurementView(context);
         whrMeasurementView = new WHRMeasurementView(context);
         bmrMeasurementView = new BMRMeasurementView(context);
-        boneMeasurementView = new BoneMeasurementView(context);
         commentMeasurement = new CommentMeasurementView(context);
         dateMeasurement = new DateMeasurementView(context);
         timeMeasurement = new TimeMeasurementView(context);
@@ -121,12 +121,12 @@ public class DataEntryActivity extends Activity {
         dataEntryMeasurements.add(waterMeasurement);
         dataEntryMeasurements.add(muscleMeasurement);
         dataEntryMeasurements.add(fatMeasurement);
+        dataEntryMeasurements.add(boneMeasurementView);
         dataEntryMeasurements.add(waistMeasurement);
         dataEntryMeasurements.add(wHtRMeasurementView);
         dataEntryMeasurements.add(hipMeasurement);
         dataEntryMeasurements.add(whrMeasurementView);
         dataEntryMeasurements.add(bmrMeasurementView);
-        dataEntryMeasurements.add(boneMeasurementView);
         dataEntryMeasurements.add(commentMeasurement);
         dataEntryMeasurements.add(dateMeasurement);
         dataEntryMeasurements.add(timeMeasurement);