Zepp OS: Add statistics fetch operation

We do not know what they are or how to parse them, but syncing them
helps free up space from the band.

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/HuamiService.java

@@ -229,6 +229,7 @@ public class HuamiService {
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_STRESS_AUTOMATIC = 0x13;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_SPO2_NORMAL = 0x25;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_SPO2_SLEEP = 0x26;
+    public static final byte COMMAND_ACTIVITY_DATA_TYPE_STATISTICS = 0x2c;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_TEMPERATURE = 0x2e;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_SLEEP_RESPIRATORY_RATE = 0x38;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_RESTING_HEART_RATE = 0x3a;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/RecordedDataTypes.java

@@ -28,6 +28,7 @@ public class RecordedDataTypes {
     public static final int TYPE_HEART_RATE   = 0x00000080;
     public static final int TYPE_PAI          = 0x00000100;
     public static final int TYPE_SLEEP_RESPIRATORY_RATE = 0x00000200;
+    public static final int TYPE_HUAMI_STATISTICS = 0x00000400;
 
     public static final int TYPE_ALL          = (int)0xffffffff;
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/HuamiSupport.java

@@ -122,6 +122,7 @@ import nodomain.freeyourgadget.gadgetbridge.model.ActivityUser;
 import nodomain.freeyourgadget.gadgetbridge.model.Alarm;
 import nodomain.freeyourgadget.gadgetbridge.model.RecordedDataTypes;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.AbstractFetchOperation;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.FetchStatisticsOperation;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.FetchTemperatureOperation;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.FetchHeartRateManualOperation;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations.FetchHeartRateMaxOperation;
@@ -1705,6 +1706,10 @@ public abstract class HuamiSupport extends AbstractBTLEDeviceSupport implements
             }
         }
 
+        if ((dataTypes & RecordedDataTypes.TYPE_HUAMI_STATISTICS) != 0) {
+            this.fetchOperationQueue.add(new FetchStatisticsOperation(this));
+        }
+
         final AbstractFetchOperation nextOperation = this.fetchOperationQueue.poll();
         if (nextOperation != null) {
             try {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/operations/FetchStatisticsOperation.java

@@ -0,0 +1,68 @@
+/*  Copyright (C) 2023 José Rebelo
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiService;
+import nodomain.freeyourgadget.gadgetbridge.service.btle.BLETypeConversions;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiSupport;
+
+/**
+ * An operation that fetches statistics from /storage/statistics/ (hm_statis_data* files). We do not
+ * know what these are or how to parse them, but syncing them helps free up memory.
+ */
+public class FetchStatisticsOperation extends AbstractRepeatingFetchOperation {
+    private static final Logger LOG = LoggerFactory.getLogger(FetchStatisticsOperation.class);
+
+    public FetchStatisticsOperation(final HuamiSupport support) {
+        super(support, HuamiService.COMMAND_ACTIVITY_DATA_TYPE_STATISTICS, "statistics data");
+    }
+
+    @Override
+    protected String taskDescription() {
+        return getContext().getString(R.string.busy_task_fetch_statistics);
+    }
+
+    @Override
+    protected boolean handleActivityData(final GregorianCalendar timestamp, final byte[] bytes) {
+        LOG.debug("Ignoring {} bytes of statistics", bytes.length);
+
+        timestamp.setTime(new Date());
+
+        return true;
+    }
+
+    @Override
+    protected GregorianCalendar getLastSuccessfulSyncTime() {
+        // One minute ago - we don't really care about this data, and we don't want to fetch it all
+        final GregorianCalendar sinceWhen = BLETypeConversions.createCalendar();
+        sinceWhen.add(Calendar.MINUTE, -1);
+        return sinceWhen;
+    }
+
+    @Override
+    protected String getLastSyncTimeKey() {
+        return "lastStatisticsTimeMillis";
+    }
+}

app/src/main/res/values/strings.xml

@@ -631,6 +631,7 @@
     <string name="busy_task_fetch_hr_data">Fetching heart rate data</string>
     <string name="busy_task_fetch_sleep_respiratory_rate_data">Fetching sleep respiratory rate data</string>
     <string name="busy_task_fetch_temperature">Fetching temperature data</string>
+    <string name="busy_task_fetch_statistics">Fetching statistics</string>
     <string name="sleep_activity_date_range">From %1$s to %2$s</string>
     <string name="prefs_wearside">Wearing left or right?</string>
     <string name="prefs_weardirection">Wearing direction</string>