Mijia LYWSD02: Battery + setting temperature scale

Implement reading battery percentage.
Implement setting temperature scale used on clock display.

Communication protocol taken from: https://github.com/h4/lywsd02

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/devicesettings/DeviceSettingsPreferenceConst.java

@@ -360,4 +360,6 @@ public class DeviceSettingsPreferenceConst {
     public static final String PREF_HOURLY_CHIME_END = "hourly_chime_end";
 
     public static final String PREF_VOICE_SERVICE_LANGUAGE = "voice_service_language";
+
+    public static final String PREF_TEMPERATURE_SCALE_CF = "temperature_scale_cf";
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/devicesettings/DeviceSpecificSettingsFragment.java

@@ -545,6 +545,8 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
 
         addPreferenceHandlerFor(PREF_VOICE_SERVICE_LANGUAGE);
 
+        addPreferenceHandlerFor(PREF_TEMPERATURE_SCALE_CF);
+
         addPreferenceHandlerFor("lock");
 
         String sleepTimeState = prefs.getString(PREF_SLEEP_TIME, PREF_DO_NOT_DISTURB_OFF);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/mijia_lywsd02/MijiaLywsd02Coordinator.java

@@ -23,6 +23,7 @@ import android.net.Uri;
 
 import androidx.annotation.NonNull;
 
+import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLEDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
@@ -142,6 +143,13 @@ public class MijiaLywsd02Coordinator extends AbstractBLEDeviceCoordinator {
         return MijiaLywsd02Support.class;
     }
 
+    @Override
+    public int[] getSupportedDeviceSpecificSettings(GBDevice device) {
+        return new int[]{
+                R.xml.devicesettings_temperature_scale_cf,
+        };
+    }
+
     @Override
     protected void deleteDevice(@NonNull GBDevice gbDevice, @NonNull Device device, @NonNull DaoSession session) {
         // nothing to delete, yet

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/mijia_lywsd02/MijiaLywsd02Support.java

@@ -1,5 +1,5 @@
 /*  Copyright (C) 2016-2021 Andreas Shimokawa, Carsten Pfeiffer, Sebastian
-    Kranz
+    Kranz, Davis Mosenkovs
 
     This file is part of Gadgetbridge.
 
@@ -21,15 +21,19 @@ import android.bluetooth.BluetoothGatt;
 import android.bluetooth.BluetoothGattCharacteristic;
 import android.content.Intent;
 import android.net.Uri;
+import android.widget.Toast;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Objects;
 import java.util.SimpleTimeZone;
 import java.util.UUID;
 
+import nodomain.freeyourgadget.gadgetbridge.GBApplication;
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst;
 import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventBatteryInfo;
 import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventVersionInfo;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
@@ -48,10 +52,14 @@ import nodomain.freeyourgadget.gadgetbridge.service.btle.actions.SetDeviceStateA
 import nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.IntentListener;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.battery.BatteryInfoProfile;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.deviceinfo.DeviceInfoProfile;
+import nodomain.freeyourgadget.gadgetbridge.util.GB;
 
 public class MijiaLywsd02Support extends AbstractBTLEDeviceSupport {
 
     private static final Logger LOG = LoggerFactory.getLogger(MijiaLywsd02Support.class);
+    private static final UUID UUID_TIME = UUID.fromString("ebe0ccb7-7a0a-4b0c-8a1a-6ff2997da3a6");
+    private static final UUID UUID_BATTERY = UUID.fromString("ebe0ccc4-7a0a-4b0c-8a1a-6ff2997da3a6");
+    private static final UUID UUID_SCALE = UUID.fromString("ebe0ccbe-7a0a-4b0c-8a1a-6ff2997da3a6");
     private final DeviceInfoProfile<MijiaLywsd02Support> deviceInfoProfile;
     private final GBDeviceEventVersionInfo versionCmd = new GBDeviceEventVersionInfo();
     private final GBDeviceEventBatteryInfo batteryCmd = new GBDeviceEventBatteryInfo();
@@ -81,12 +89,13 @@ public class MijiaLywsd02Support extends AbstractBTLEDeviceSupport {
         builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.INITIALIZING, getContext()));
         requestDeviceInfo(builder);
         setTime(builder);
+        getBatteryInfo(builder);
         setInitialized(builder);
         return builder;
     }
 
     private void setTime(TransactionBuilder builder) {
-        BluetoothGattCharacteristic timeCharacteristc = getCharacteristic(UUID.fromString("ebe0ccb7-7a0a-4b0c-8a1a-6ff2997da3a6"));
+        BluetoothGattCharacteristic timeCharacteristc = getCharacteristic(MijiaLywsd02Support.UUID_TIME);
         long ts = System.currentTimeMillis();
         byte offsetHours = (byte) (SimpleTimeZone.getDefault().getOffset(ts) / (1000 * 60 * 60));
         ts /= 1000;
@@ -98,6 +107,24 @@ public class MijiaLywsd02Support extends AbstractBTLEDeviceSupport {
                 offsetHours});
     }
 
+    private void getBatteryInfo(TransactionBuilder builder) {
+        BluetoothGattCharacteristic batteryCharacteristc = getCharacteristic(MijiaLywsd02Support.UUID_BATTERY);
+        builder.read(batteryCharacteristc);
+    }
+
+    private void setTemperatureScale(TransactionBuilder builder, String scale) {
+        BluetoothGattCharacteristic scaleCharacteristc = getCharacteristic(MijiaLywsd02Support.UUID_SCALE);
+        builder.write(scaleCharacteristc, new byte[]{ (byte) ("f".equals(scale) ? 0x01 : 0xff) });
+        builder.queue(getQueue());
+    }
+
+    private void handleBatteryInfo(byte[] value, int status) {
+        if (status == BluetoothGatt.GATT_SUCCESS) {
+            batteryCmd.level = ((short) value[0]);
+            handleGBDeviceEvent(batteryCmd);
+        }
+    }
+
     private void requestDeviceInfo(TransactionBuilder builder) {
         LOG.debug("Requesting Device Info!");
         deviceInfoProfile.requestDeviceInfo(builder);
@@ -144,7 +171,27 @@ public class MijiaLywsd02Support extends AbstractBTLEDeviceSupport {
         }
         UUID characteristicUUID = characteristic.getUuid();
 
+        if(MijiaLywsd02Support.UUID_BATTERY.equals(characteristicUUID)) {
+            handleBatteryInfo(characteristic.getValue(), status);
+            return true;
+        }
         LOG.info("Unhandled characteristic read: " + characteristicUUID);
         return false;
     }
+
+    @Override
+    public void onSendConfiguration(String config) {
+        TransactionBuilder builder;
+        try {
+            switch (config) {
+                case DeviceSettingsPreferenceConst.PREF_TEMPERATURE_SCALE_CF:
+                    String temperatureScale = GBApplication.getDeviceSpecificSharedPrefs(gbDevice.getAddress()).getString(DeviceSettingsPreferenceConst.PREF_TEMPERATURE_SCALE_CF, "");
+                    builder = performInitialized("Sending configuration for option: " + config);
+                    setTemperatureScale(builder, temperatureScale);
+                    break;
+            }
+        } catch (IOException e) {
+            GB.toast("Error setting configuration", Toast.LENGTH_LONG, GB.ERROR, e);
+        }
+    }
 }

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

@@ -3394,4 +3394,13 @@
         <item>purple</item>
         <item>white</item>
     </string-array>
+
+    <string-array name="temperature_scales_cf">
+        <item>@string/temperature_scale_celsius</item>
+        <item>@string/temperature_scale_fahrenheit</item>
+    </string-array>
+    <string-array name="temperature_scales_cf_values">
+        <item>c</item>
+        <item>f</item>
+    </string-array>
 </resources>

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

@@ -2351,4 +2351,9 @@
     <string name="prefs_wena3_vibration_siren">Siren</string>
     <string name="prefs_wena3_vibration_short">Short</string>
     <string name="prefs_wena3_led_none">No LED</string>
+
+    <string name="temperature_scale_cf">Temperature scale</string>
+    <string name="temperature_scale_cf_summary">Select whether device uses Celsius or Fahrenheit scale.</string>
+    <string name="temperature_scale_celsius">Celsius</string>
+    <string name="temperature_scale_fahrenheit">Fahrenheit</string>
 </resources>

app/src/main/res/xml/devicesettings_temperature_scale_cf.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <ListPreference
+        android:key="temperature_scale_cf"
+        android:title="@string/temperature_scale_cf"
+        android:entries="@array/temperature_scales_cf"
+        android:entryValues="@array/temperature_scales_cf_values"
+        android:summary="@string/temperature_scale_cf_summary" />
+</PreferenceScreen>