Shokz OpenSwim Pro: Initial support

.idea/dictionaries/t.xml

@@ -147,6 +147,7 @@
       <w>sevostyanova</w>
       <w>shahrabani</w>
       <w>shimokawa</w>
+      <w>shokz</w>
       <w>skype</w>
       <w>slezak</w>
       <w>sophanimus</w>

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

@@ -516,6 +516,13 @@ public class DeviceSettingsPreferenceConst {
     public static final String PREF_SONY_ADAPTIVE_VOLUME_CONTROL = "pref_adaptive_volume_control";
     public static final String PREF_SONY_WIDE_AREA_TAP = "pref_wide_area_tap";
 
+    public static final String PREF_MEDIA_SOURCE = "pref_media_source";
+    public static final String PREF_MEDIA_PLAYBACK_MODE = "pref_media_playback_mode";
+    public static final String PREF_SHOKZ_EQUALIZER_BLUETOOTH = "pref_shokz_equalizer_bluetooth";
+    public static final String PREF_SHOKZ_EQUALIZER_MP3 = "pref_shokz_equalizer_mp3";
+    public static final String PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION = "shokz_controls_long_press_multi_function";
+    public static final String PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN = "shokz_controls_simultaneous_volume_up_down";
+
     public static final String PREF_OVERRIDE_FEATURES_ENABLED = "override_features_enabled";
     public static final String PREF_OVERRIDE_FEATURES_LIST = "override_features_list";
 

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

@@ -24,6 +24,7 @@ import androidx.annotation.Nullable;
 import androidx.annotation.XmlRes;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -47,6 +48,9 @@ public class DeviceSpecificSettings implements Parcelable {
     private final List<Integer> rootScreens = new ArrayList<>();
     private final Map<String, List<Integer>> subScreens = new LinkedHashMap<>();
 
+    /// Settings that should only be available while connected
+    private final List<String> connectedPreferences = new ArrayList<>();
+
     public DeviceSpecificSettings() {
     }
 
@@ -115,6 +119,7 @@ public class DeviceSpecificSettings implements Parcelable {
                 Objects.requireNonNull(subScreens.get(e.getKey())).add(screen);
             }
         }
+        connectedPreferences.addAll(deviceSpecificSettings.connectedPreferences);
     }
 
     public List<Integer> getRootScreens() {
@@ -126,6 +131,14 @@ public class DeviceSpecificSettings implements Parcelable {
         return subScreens.get(key);
     }
 
+    public void addConnectedPreferences(final String... preferences) {
+        connectedPreferences.addAll(Arrays.asList(preferences));
+    }
+
+    public List<String> getConnectedPreferences() {
+        return connectedPreferences;
+    }
+
     public List<Integer> getAllNonRootScreens() {
         final List<Integer> allScreens = new ArrayList<>();
         for (final List<Integer> screens : subScreens.values()) {
@@ -143,7 +156,7 @@ public class DeviceSpecificSettings implements Parcelable {
         return allScreens;
     }
 
-    public static final Creator<DeviceSpecificSettings> CREATOR = new Creator<DeviceSpecificSettings>() {
+    public static final Creator<DeviceSpecificSettings> CREATOR = new Creator<>() {
         @Override
         public DeviceSpecificSettings createFromParcel(final Parcel in) {
             final DeviceSpecificSettings deviceSpecificSettings = new DeviceSpecificSettings();
@@ -161,6 +174,7 @@ public class DeviceSpecificSettings implements Parcelable {
                 }
                 deviceSpecificSettings.addSubScreen(key, screens);
             }
+            in.readStringList(deviceSpecificSettings.connectedPreferences);
             return deviceSpecificSettings;
         }
 
@@ -189,5 +203,6 @@ public class DeviceSpecificSettings implements Parcelable {
                 dest.writeInt(s);
             }
         }
+        dest.writeStringList(connectedPreferences);
     }
 }

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

@@ -103,6 +103,7 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
 
     static final String FRAGMENT_TAG = "DEVICE_SPECIFIC_SETTINGS_FRAGMENT";
 
+    private DeviceSpecificSettings deviceSpecificSettings;
     private DeviceSpecificSettingsCustomizer deviceSpecificSettingsCustomizer;
 
     private GBDevice device;
@@ -142,6 +143,7 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
                         LOG.debug("{} changed, notifying customizer", changedDevice);
                         deviceSpecificSettingsCustomizer.onDeviceChanged(DeviceSpecificSettingsFragment.this);
                     }
+                    reloadEnabledPreferences();
                 }
             }
         }
@@ -174,7 +176,7 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
             return;
         }
         String settingsFileSuffix = arguments.getString("settingsFileSuffix", null);
-        DeviceSpecificSettings deviceSpecificSettings = arguments.getParcelable("deviceSpecificSettings");
+        this.deviceSpecificSettings = arguments.getParcelable("deviceSpecificSettings");
         this.deviceSpecificSettingsCustomizer = arguments.getParcelable("deviceSpecificSettingsCustomizer");
         this.device = arguments.getParcelable("device");
 
@@ -241,6 +243,19 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
         }
 
         setChangeListener(rootKey);
+
+        reloadEnabledPreferences();
+    }
+
+    private void reloadEnabledPreferences() {
+        if (deviceSpecificSettings != null) {
+            for (String connectedPreference : deviceSpecificSettings.getConnectedPreferences()) {
+                final Preference pref = findPreference(connectedPreference);
+                if (pref != null) {
+                    pref.setEnabled(device.isInitialized());
+                }
+            }
+        }
     }
 
     private void addDynamicSettings(final String rootKey) {
@@ -811,6 +826,14 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
         addPreferenceHandlerFor(PREF_SONY_ADAPTIVE_VOLUME_CONTROL);
         addPreferenceHandlerFor(PREF_SONY_WIDE_AREA_TAP);
 
+        addPreferenceHandlerFor(PREF_MEDIA_SOURCE);
+        addPreferenceHandlerFor(PREF_MEDIA_PLAYBACK_MODE);
+        addPreferenceHandlerFor(PREF_SHOKZ_EQUALIZER_BLUETOOTH);
+        addPreferenceHandlerFor(PREF_SHOKZ_EQUALIZER_MP3);
+
+        addPreferenceHandlerFor(PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION);
+        addPreferenceHandlerFor(PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN);
+
         addPreferenceHandlerFor(PREF_SOUNDCORE_AMBIENT_SOUND_CONTROL);
         addPreferenceHandlerFor(PREF_SOUNDCORE_WIND_NOISE_REDUCTION);
         addPreferenceHandlerFor(PREF_SOUNDCORE_TRANSPARENCY_VOCAL_MODE);

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

@@ -16,6 +16,7 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.activities.devicesettings;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.XmlRes;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
@@ -50,6 +51,7 @@ public enum DeviceSpecificSettingsScreen {
         this.xml = xml;
     }
 
+    @NonNull
     public String getKey() {
         return key;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/deviceevents/GBDeviceEvent.java

@@ -50,9 +50,6 @@ public abstract class GBDeviceEvent {
     /**
      * Helper method to run specific actions configured in the device preferences, upon wear state
      * or awake/asleep events.
-     *
-     * @param actions
-     * @param message
      */
     protected void handleDeviceAction(final Context context, final GBDevice device, Set<String> actions, String message, String broadcastPackage) {
         if (actions.isEmpty()) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/deviceevents/GBDeviceEventUpdatePreferences.java

@@ -19,6 +19,8 @@ package nodomain.freeyourgadget.gadgetbridge.deviceevents;
 import android.content.Context;
 import android.content.SharedPreferences;
 
+import androidx.annotation.NonNull;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -34,6 +36,18 @@ public class GBDeviceEventUpdatePreferences extends GBDeviceEvent {
 
     public final Map<String, Object> preferences;
 
+    @NonNull
+    @Override
+    public String toString() {
+        final StringBuilder sb = new StringBuilder(super.toString());
+        sb.append("preferences: ");
+        for (Map.Entry<String, Object> e : preferences.entrySet()) {
+            sb.append(e.getKey()).append("=").append(e.getValue()).append(", ");
+        }
+        sb.setLength(sb.length() - 2);
+        return sb.toString();
+    }
+
     public GBDeviceEventUpdatePreferences() {
         this.preferences = new HashMap<>();
     }
@@ -73,10 +87,11 @@ public class GBDeviceEventUpdatePreferences extends GBDeviceEvent {
     private void update(final SharedPreferences prefs) {
         final SharedPreferences.Editor editor = prefs.edit();
 
-        for (String key : preferences.keySet()) {
+        for (Map.Entry<String, Object> e : preferences.entrySet()) {
-            final Object value = preferences.get(key);
+            final String key = e.getKey();
+            final Object value = e.getValue();
 
-            LOG.debug("Updating {} = {}", key, value);
+            LOG.trace("Updating {} = {}", key, value);
 
             if (value == null) {
                 editor.remove(key);
@@ -93,6 +108,7 @@ public class GBDeviceEventUpdatePreferences extends GBDeviceEvent {
             } else if (value instanceof Long) {
                 editor.putLong(key, (Long) value);
             } else if (value instanceof Set) {
+                //noinspection unchecked,rawtypes
                 editor.putStringSet(key, (Set) value);
             } else {
                 LOG.warn("Unknown preference value type {} for {}", value.getClass(), key);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/shokz/ShokzCoordinator.kt

@@ -0,0 +1,70 @@
+package nodomain.freeyourgadget.gadgetbridge.devices.shokz
+
+import nodomain.freeyourgadget.gadgetbridge.R
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettings
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettingsCustomizer
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettingsScreen
+import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLClassicDeviceCoordinator
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice
+import nodomain.freeyourgadget.gadgetbridge.service.DeviceSupport
+import nodomain.freeyourgadget.gadgetbridge.service.devices.shokz.ShokzSupport
+
+abstract class ShokzCoordinator : AbstractBLClassicDeviceCoordinator() {
+    override fun getManufacturer(): String? {
+        return "Shokz"
+    }
+
+    override fun getDeviceSupportClass(device: GBDevice): Class<out DeviceSupport?> {
+        return ShokzSupport::class.java
+    }
+
+    override fun suggestUnbindBeforePair(): Boolean {
+        return false
+    }
+
+    override fun getDefaultIconResource(): Int {
+        // TODO dedicated icon
+        return R.drawable.ic_device_headphones
+    }
+
+    override fun getSupportedLanguageSettings(device: GBDevice): Array<out String>? {
+        return arrayOf(
+            "en",
+            "zh",
+            "ja",
+            "ko",
+        )
+    }
+
+    override fun getDeviceSpecificSettings(device: GBDevice): DeviceSpecificSettings {
+        val settings = DeviceSpecificSettings()
+
+        settings.addRootScreen(R.xml.devicesettings_media_source)
+        settings.addRootScreen(R.xml.devicesettings_shokz_equalizer)
+        settings.addRootScreen(R.xml.devicesettings_playback_mode)
+
+        settings.addRootScreen(DeviceSpecificSettingsScreen.TOUCH_OPTIONS)
+        settings.addSubScreen(DeviceSpecificSettingsScreen.TOUCH_OPTIONS, R.xml.devicesettings_shokz_controls)
+
+        settings.addRootScreen(DeviceSpecificSettingsScreen.CALLS_AND_NOTIFICATIONS)
+        settings.addSubScreen(DeviceSpecificSettingsScreen.CALLS_AND_NOTIFICATIONS, R.xml.devicesettings_headphones)
+
+        settings.addConnectedPreferences(
+            DeviceSettingsPreferenceConst.PREF_LANGUAGE,
+            DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_BLUETOOTH,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_MP3,
+            DeviceSettingsPreferenceConst.PREF_MEDIA_PLAYBACK_MODE,
+            DeviceSpecificSettingsScreen.TOUCH_OPTIONS.key,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN,
+        )
+
+        return settings
+    }
+
+    override fun getDeviceSpecificSettingsCustomizer(device: GBDevice): DeviceSpecificSettingsCustomizer? {
+        return ShokzSettingsCustomizer()
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/shokz/ShokzOpenSwimProCoordinator.kt

@@ -0,0 +1,14 @@
+package nodomain.freeyourgadget.gadgetbridge.devices.shokz
+
+import nodomain.freeyourgadget.gadgetbridge.R
+import java.util.regex.Pattern
+
+class ShokzOpenSwimProCoordinator: ShokzCoordinator() {
+    override fun getSupportedDeviceName(): Pattern? {
+        return Pattern.compile("^OpenSwim Pro by Shokz$")
+    }
+
+    override fun getDeviceNameResource(): Int {
+        return R.string.devicetype_shokz_openswim_pro
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/shokz/ShokzSettingsCustomizer.kt

@@ -0,0 +1,75 @@
+/*  Copyright (C) 2025 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 <https://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.devices.shokz
+
+import androidx.preference.Preference
+import kotlinx.parcelize.Parcelize
+import nodomain.freeyourgadget.gadgetbridge.GBApplication
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettingsCustomizer
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettingsHandler
+import nodomain.freeyourgadget.gadgetbridge.service.devices.shokz.ShokzMediaSource
+import nodomain.freeyourgadget.gadgetbridge.util.Prefs
+import org.slf4j.LoggerFactory
+
+@Parcelize
+class ShokzSettingsCustomizer : DeviceSpecificSettingsCustomizer {
+    override fun onPreferenceChange(
+        preference: Preference,
+        handler: DeviceSpecificSettingsHandler
+    ) {
+    }
+
+    override fun onDeviceChanged(handler: DeviceSpecificSettingsHandler) {
+        hideEqualizers(handler, GBApplication.getDevicePrefs(handler.device))
+    }
+
+    override fun customizeSettings(
+        handler: DeviceSpecificSettingsHandler,
+        genericDevicePrefs: Prefs,
+        rootKey: String?
+    ) {
+        hideEqualizers(handler, genericDevicePrefs)
+    }
+
+    private fun hideEqualizers(
+        handler: DeviceSpecificSettingsHandler,
+        devicePrefs: Prefs
+    ) {
+        val mediaSourceValue: String =
+            devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE, "")
+        val mediaSource = ShokzMediaSource.fromPreference(mediaSourceValue) ?: run {
+            LOG.warn("Unknown media source {}", mediaSourceValue)
+            null
+        }
+
+        handler.findPreference<Preference>(DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_BLUETOOTH)?.isVisible =
+            mediaSource == ShokzMediaSource.BLUETOOTH
+        handler.findPreference<Preference>(DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_MP3)?.isVisible =
+            mediaSource == ShokzMediaSource.MP3
+        handler.findPreference<Preference>(DeviceSettingsPreferenceConst.PREF_MEDIA_PLAYBACK_MODE)?.isVisible =
+            mediaSource == ShokzMediaSource.MP3
+    }
+
+    override fun getPreferenceKeysWithSummary(): Set<String> {
+        return setOf()
+    }
+
+    companion object {
+        private val LOG = LoggerFactory.getLogger(ShokzSettingsCustomizer::class.java)
+    }
+}

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

@@ -315,6 +315,7 @@ import nodomain.freeyourgadget.gadgetbridge.devices.redmibuds.RedmiBuds6ProCoord
 import nodomain.freeyourgadget.gadgetbridge.devices.roidmi.Roidmi1Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.roidmi.Roidmi3Coordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.scannable.ScannableDeviceCoordinator;
+import nodomain.freeyourgadget.gadgetbridge.devices.shokz.ShokzOpenSwimProCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.smaq2oss.SMAQ2OSSCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.soflow.SoFlowCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.sony.headphones.coordinators.SonyLinkBudsCoordinator;
@@ -662,6 +663,7 @@ public enum DeviceType {
     SONY_WF_C700N(SonyWFC700NCoordinator.class),
     SONY_WF_C710N(SonyWFC710NCoordinator.class),
     PIXEL_BUDS_A(PixelBudsACoordinator.class),
+    SHOKZ_OPENSWIM_PRO(ShokzOpenSwimProCoordinator.class),
     SOUNDCORE_LIBERTY3_PRO(SoundcoreLiberty3ProCoordinator.class),
     SOUNDCORE_LIBERTY4_NC(SoundcoreLiberty4NCCoordinator.class),
     SOUNDCORE_MOTION300(SoundcoreMotion300Coordinator.class),

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/AbstractHeadphoneBTBRDeviceSupport.kt

@@ -0,0 +1,41 @@
+package nodomain.freeyourgadget.gadgetbridge.service
+
+import android.bluetooth.BluetoothAdapter
+import android.content.Context
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice
+import nodomain.freeyourgadget.gadgetbridge.model.CallSpec
+import nodomain.freeyourgadget.gadgetbridge.model.NotificationSpec
+import nodomain.freeyourgadget.gadgetbridge.service.btbr.AbstractBTBRDeviceSupport
+import org.slf4j.Logger
+
+abstract class AbstractHeadphoneBTBRDeviceSupport(logger: Logger, bufferSize: Int = 1024) :
+    AbstractBTBRDeviceSupport(logger, bufferSize), HeadphoneHelper.Callback {
+
+    private lateinit var headphoneHelper: HeadphoneHelper
+
+    override fun setContext(gbDevice: GBDevice, btAdapter: BluetoothAdapter, context: Context) {
+        super.setContext(gbDevice, btAdapter, context)
+        headphoneHelper = HeadphoneHelper(getContext(), gbDevice, this)
+    }
+
+    override fun dispose() {
+        synchronized(ConnectionMonitor) {
+            headphoneHelper.dispose()
+            super.dispose()
+        }
+    }
+
+    override fun onSetCallState(callSpec: CallSpec) {
+        headphoneHelper.onSetCallState(callSpec)
+    }
+
+    override fun onNotification(notificationSpec: NotificationSpec) {
+        headphoneHelper.onNotification(notificationSpec)
+    }
+
+    override fun onSendConfiguration(config: String) {
+        if (!headphoneHelper.onSendConfiguration(config)) {
+            super.onSendConfiguration(config)
+        }
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btbr/AbstractBTBRDeviceSupport.java

@@ -16,6 +16,10 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.service.btbr;
 
+import android.annotation.SuppressLint;
+import android.bluetooth.BluetoothDevice;
+import android.os.ParcelUuid;
+
 import org.slf4j.Logger;
 
 import java.io.IOException;
@@ -24,6 +28,7 @@ import java.util.UUID;
 import nodomain.freeyourgadget.gadgetbridge.Logging;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.service.AbstractDeviceSupport;
+import nodomain.freeyourgadget.gadgetbridge.service.btle.BleNamesResolver;
 
 /**
  * Abstract base class for devices connected through a serial protocol, like RFCOMM BT or TCP socket.
@@ -42,11 +47,15 @@ public abstract class AbstractBTBRDeviceSupport extends AbstractDeviceSupport im
 
     private BtBRQueue mQueue;
     private UUID mSupportedService = null;
-    private int mBufferSize = 1024;
+    private final int mBufferSize;
     private final Logger logger;
 
-    public AbstractBTBRDeviceSupport(Logger logger) {
+    /**
+     * @param bufferSize should be larger than the maximum expected message side, or messages might be lost.
+     */
+    public AbstractBTBRDeviceSupport(Logger logger, final int bufferSize) {
         this.logger = logger;
+        this.mBufferSize = bufferSize;
         if (logger == null) {
             throw new IllegalArgumentException("logger must not be null");
         }
@@ -57,6 +66,21 @@ public abstract class AbstractBTBRDeviceSupport extends AbstractDeviceSupport im
         synchronized (ConnectionMonitor) {
             final UUID supportedService = getSupportedService();
             if (supportedService == null) {
+                // Before throwing the exception, list the available UUIDs
+                final BluetoothDevice btDevice = getBluetoothAdapter().getRemoteDevice(gbDevice.getAddress());
+                @SuppressLint("MissingPermission") final ParcelUuid[] uuids = btDevice.getUuids();
+                if (uuids == null || uuids.length == 0) {
+                    logger.warn("Device provided no UUIDs to connect to: {}", gbDevice);
+                } else {
+                    for (ParcelUuid uuid : uuids) {
+                        logger.debug(
+                                "discovered service: {}: {}",
+                                BleNamesResolver.resolveServiceName(uuid.toString()),
+                                uuid
+                        );
+                    }
+                }
+
                 throw new NullPointerException("No supported service UUID specified");
             }
 
@@ -136,10 +160,6 @@ public abstract class AbstractBTBRDeviceSupport extends AbstractDeviceSupport im
         return mSupportedService;
     }
 
-    protected void setBufferSize(int bufferSize) {
-        mBufferSize = bufferSize;
-    }
-
     protected int getBufferSize() {
         return mBufferSize;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btbr/SocketCallback.java

@@ -26,8 +26,6 @@ public interface SocketCallback {
 
     /**
      * Read data from InputStream of BluetoothSocket
-     *
-     * @param data
      */
     void onSocketRead(byte[] data);
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btbr/actions/WriteAction.java

@@ -30,7 +30,7 @@ import nodomain.freeyourgadget.gadgetbridge.service.btbr.BtBRAction;
 /**
  * Invokes a write operation on a given socket.
  * The result status will be made available asynchronously through the
- * {@link SocketCallback}
+ * {@link nodomain.freeyourgadget.gadgetbridge.service.btbr.SocketCallback}
  */
 public class WriteAction extends BtBRAction {
     private static final Logger LOG = LoggerFactory.getLogger(WriteAction.class);
@@ -59,7 +59,7 @@ public class WriteAction extends BtBRAction {
 
     protected boolean writeValue(byte[] value) {
         if (LOG.isDebugEnabled()) {
-            LOG.debug("writing to socket: " + Logging.formatBytes(value));
+            LOG.debug("writing to socket: {}", Logging.formatBytes(value));
         }
         try {
             mOutputStream.write(value);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btle/BleNamesResolver.java

@@ -485,6 +485,11 @@ public class BleNamesResolver {
         mServices.put("0000185a-0000-1000-8000-00805f9b34fb", "Industrial Measurement Device");
         mServices.put("0000185b-0000-1000-8000-00805f9b34fb", "Ranging");
 
+        mServices.put("00001101-0000-1000-8000-00805f9b34fb", "SPP (Serial Port Profile)");
+        mServices.put("0000111e-0000-1000-8000-00805f9b34fb", "HFP HS (Hands-Free Profile)");
+        mServices.put("0000110b-0000-1000-8000-00805f9b34fb", "A2DP Sink");
+        mServices.put("0000110e-0000-1000-8000-00805f9b34fb", "AVRCP Remote");
+
         mServices.put("0000fdab-0000-1000-8000-00805f9b34fb", "(Propr: Xiaomi Proximity Unlock Service)");
         mServices.put("0000fe95-0000-1000-8000-00805f9b34fb", "(Propr: Xiaomi Wear Service)");
         mServices.put("0000fee0-0000-3512-2118-0009af100700", "(Propr: Xiaomi MiLi Service)");

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/aawireless/AAWirelessSupport.java

@@ -70,9 +70,8 @@ public class AAWirelessSupport extends AbstractBTBRDeviceSupport {
     private final BroadcastReceiver commandReceiver = new AAWirelessCommandReceiver();
 
     public AAWirelessSupport() {
-        super(LOG);
+        super(LOG, MAX_MTU);
         addSupportedService(UUID_SERVICE_AAWIRELESS);
-        setBufferSize(MAX_MTU);
     }
 
     @Override

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

@@ -101,9 +101,8 @@ public class ZeppOsBtbrSupport extends AbstractBTBRDeviceSupport implements Zepp
     private long lastWrite = -1;
 
     public ZeppOsBtbrSupport() {
-        super(LOG);
+        super(LOG, MAX_MTU);
         addSupportedService(HuamiService.UUID_BT_SERIAL_SERVICE);
-        setBufferSize(MAX_MTU);
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HonorBRSupport.java

@@ -17,17 +17,11 @@
 
 package nodomain.freeyourgadget.gadgetbridge.service.devices.huawei;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import nodomain.freeyourgadget.gadgetbridge.devices.huawei.HuaweiConstants;
 
 public class HonorBRSupport extends HuaweiBRSupport {
-    private static final Logger LOG = LoggerFactory.getLogger(HonorBRSupport.class);
     public HonorBRSupport() {
         super();
         addSupportedService(HuaweiConstants.UUID_SERVICE_HONOR_SDP);
-        setBufferSize(1032);
     }
-
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiBRSupport.java

@@ -49,9 +49,8 @@ public class HuaweiBRSupport extends AbstractBTBRDeviceSupport {
     private final HuaweiSupportProvider supportProvider;
 
     public HuaweiBRSupport() {
-        super(LOG);
+        super(LOG, 1032);
         addSupportedService(HuaweiConstants.UUID_SERVICE_HUAWEI_SDP);
-        setBufferSize(1032);
         supportProvider = new HuaweiSupportProvider(this);
     }
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiFreebudsSupport.java

@@ -56,7 +56,6 @@ public class HuaweiFreebudsSupport extends HuaweiBRSupport implements HeadphoneH
     public HuaweiFreebudsSupport() {
         super();
         addSupportedService(UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"));
-        setBufferSize(1032);
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/shokz/ShokzArguments.kt

@@ -0,0 +1,74 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.shokz
+
+/// Naming: LONG_PRESS_MULTI_FUNCTION __ SIMULTANEOUS_VOLUME_UP_DOWN
+enum class ShokzControls(val code: Int) {
+    ASSISTANT__MEDIA_SOURCE(0x01),
+    MEDIA_SOURCE__ASSISTANT(0x02),
+    MEDIA_SOURCE__MEDIA_SOURCE(0x03),
+    ASSISTANT__ASSISTANT(0x04),
+    ;
+
+    companion object {
+        fun fromPreference(value: String): ShokzControls? = entries.find { it.name == value.uppercase() }
+        fun fromCode(code: Int): ShokzControls? = entries.find { it.code == code }
+    }
+}
+
+enum class ShokzEqualizer(val code: Int) {
+    STANDARD(0x01),
+    VOCAL(0x02),
+    SWIMMING(0x07),
+    ;
+
+    companion object {
+        fun fromPreference(value: String): ShokzEqualizer? = entries.find { it.name == value.uppercase() }
+        fun fromCode(code: Int): ShokzEqualizer? = entries.find { it.code == code }
+    }
+}
+
+enum class ShokzMp3PlaybackMode(val code: Int) {
+    NORMAL(0x00),
+    SHUFFLE(0x01),
+    REPEAT(0x02),
+    ;
+
+    companion object {
+        fun fromPreference(value: String): ShokzMp3PlaybackMode? = entries.find { it.name == value.uppercase() }
+        fun fromCode(code: Int): ShokzMp3PlaybackMode? = entries.find { it.code == code }
+    }
+}
+
+enum class ShokzMediaSource(val code: Int) {
+    BLUETOOTH(0x00),
+    MP3(0x01),
+    ;
+
+    companion object {
+        fun fromPreference(value: String): ShokzMediaSource? = entries.find { it.name == value.uppercase() }
+        fun fromCode(code: Int): ShokzMediaSource? = entries.find { it.code == code }
+    }
+}
+
+enum class ShokzPlaybackStatus(val code: Int) {
+    PAUSED(0x00),
+    PLAYING(0xff),
+    ;
+
+    companion object {
+        fun fromPreference(value: String): ShokzPlaybackStatus? = entries.find { it.name == value.uppercase() }
+        fun fromCode(code: Int): ShokzPlaybackStatus? = entries.find { it.code == code }
+    }
+}
+
+enum class ShokzLanguage(val locale: String, val code: Int) {
+    ENGLISH("en", 0x00),
+    CHINESE("zh", 0x01),
+    JAPANESE("ja", 0x02),
+    KOREAN("ko", 0x03),
+    ;
+
+    companion object {
+        fun fromLocale(locale: String): ShokzLanguage? = entries.find { it.locale == locale }
+        fun fromCode(code: Int): ShokzLanguage? = entries.find { it.code == code }
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/shokz/ShokzCommand.kt

@@ -0,0 +1,75 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.shokz
+
+enum class ShokzCommand(
+    val group: Int,
+    val code: Int
+) {
+    BATTERY_GET(0x02, 0x0003),
+    BATTERY_RET(0x02, 0x8003),
+    CONTROLS_ACK(0x01, 0x8024),
+    CONTROLS_GET(0x02, 0x001b),
+    CONTROLS_RET(0x02, 0x801b),
+    CONTROLS_SET(0x01, 0x0024),
+    BUTTON_NEXT_ACK(0x01, 0x8008),
+    BUTTON_NEXT(0x01, 0x0008),
+    BUTTON_PAUSE_ACK(0x01, 0x8004),
+    BUTTON_PAUSE(0x01, 0x0004),
+    BUTTON_PLAY_ACK(0x01, 0x8003),
+    BUTTON_PLAY(0x01, 0x0003),
+    BUTTON_PREV_ACK(0x01, 0x8007),
+    BUTTON_PREV(0x01, 0x0007),
+    EQ_UNK_ACK_1(0x01, 0x800e),
+    EQUALIZER_ACK(0x03, 0x0009),
+    EQUALIZER_GET(0x02, 0x0008),
+    EQUALIZER_RET(0x02, 0x8008),
+    EQUALIZER_SET(0x01, 0x000e),
+    FIRMWARE_GET(0x02, 0x0002),
+    FIRMWARE_RET(0x02, 0x8002),
+    LANGUAGE_ACK(0x01, 0x8002),
+    LANGUAGE_GET(0x02, 0x0006),
+    LANGUAGE_RET(0x02, 0x8006),
+    LANGUAGE_SET(0x01, 0x0002),
+    MEDIA_SOURCE_ACK(0x01, 0x8025),
+    MEDIA_SOURCE_NOTIFY(0x03, 0x000c),
+    MEDIA_SOURCE_SET(0x01, 0x0025),
+    MODE_BLUETOOTH_UNK_0(0x03, 0x000d),
+    MEDIA_SOURCE_GET(0x02, 0x001c),
+    MEDIA_SOURCE_RET(0x02, 0x801c),
+    MODE_MP3_ACK(0x02, 0x801e),
+    MODE_MP3_SET(0x02, 0x001e),
+    MP3_PLAYBACK_MODE_ACK(0x01, 0x8026),
+    MP3_PLAYBACK_MODE_GET(0x02, 0x001d),
+    MP3_PLAYBACK_MODE_RET(0x02, 0x801d),
+    MP3_PLAYBACK_MODE_SET(0x01, 0x0026),
+    MULTIPOINT_CONNECT_ACK(0x01, 0x800b),
+    MULTIPOINT_CONNECT_REQ(0x01, 0x000b),
+    MULTIPOINT_DEVICE_CONNECTION_NOTIFY(0x03, 0x000b),
+    MULTIPOINT_DEVICES_GET(0x02, 0x0004),
+    MULTIPOINT_DEVICES_RET(0x02, 0x8004),
+    MULTIPOINT_DISCONNECT_ACK(0x01, 0x800c),
+    MULTIPOINT_DISCONNECT_REQ(0x01, 0x000c),
+    MULTIPOINT_OFF_ACK(0x01, 0x8010),
+    MULTIPOINT_OFF(0x01, 0x0010),
+    MULTIPOINT_ON_ACK(0x01, 0x8011),
+    MULTIPOINT_ON(0x01, 0x0011),
+    MULTIPOINT_PAIR_SECOND_FINISH(0x01, 0x0023),
+    MULTIPOINT_START_PAIR_ACK(0x01, 0x8022),
+    MULTIPOINT_START_PAIR_REQ(0x01, 0x001d),
+    PLAYBACK_STATUS_GET(0x02, 0x0005),
+    PLAYBACK_STATUS_NOTIFY(0x03, 0x0006),
+    PLAYBACK_STATUS_RET(0x02, 0x8005),
+    MULTIPOINT_GET(0x02, 0x0010),
+    MULTIPOINT_RET(0x02, 0x8010),
+    VOLUME_ACK(0x01, 0x800a),
+    VOLUME_GET(0x02, 0x0007),
+    VOLUME_NOTIFY(0x03, 0x0005),
+    VOLUME_RET(0x02, 0x8007),
+    VOLUME_SET(0x01, 0x000a),
+    ;
+
+    companion object {
+        fun getCommand(group: Int, code: Int): ShokzCommand? = entries.find {
+            it.group == group && it.code == code
+        }
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/shokz/ShokzMessage.kt

@@ -0,0 +1,24 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.shokz
+
+data class ShokzMessage(
+    val command: ShokzCommand,
+    val args: ByteArray = byteArrayOf()
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as ShokzMessage
+
+        if (command != other.command) return false
+        if (!args.contentEquals(other.args)) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = command.hashCode()
+        result = 31 * result + args.contentHashCode()
+        return result
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/shokz/ShokzSupport.kt

@@ -0,0 +1,626 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.shokz
+
+import android.os.Handler
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventBatteryInfo
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventUpdatePreferences
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventVersionInfo
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice
+import nodomain.freeyourgadget.gadgetbridge.service.AbstractHeadphoneBTBRDeviceSupport
+import nodomain.freeyourgadget.gadgetbridge.service.btbr.TransactionBuilder
+import nodomain.freeyourgadget.gadgetbridge.util.CheckSums
+import nodomain.freeyourgadget.gadgetbridge.util.kotlin.stringUntilNullTerminator
+import org.slf4j.LoggerFactory
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.util.LinkedList
+import java.util.Queue
+import java.util.UUID
+import kotlin.math.floor
+
+class ShokzSupport : AbstractHeadphoneBTBRDeviceSupport(LOG, MAX_MTU) {
+    private val packetBuffer: ByteBuffer = ByteBuffer.allocate(MAX_MTU).order(ByteOrder.LITTLE_ENDIAN)
+
+    private val messageQueue: Queue<ShokzMessage> = LinkedList()
+    private var pendingMessage: ShokzMessage? = null
+    private var timeoutRetries = 0
+    private val timeoutHandler = Handler()
+
+    init {
+        addSupportedService(UUID_SERVICE_SHOKZ)
+    }
+
+    override fun useAutoConnect(): Boolean {
+        return true
+    }
+
+    override fun initializeDevice(builder: TransactionBuilder): TransactionBuilder {
+        packetBuffer.clear()
+        timeoutHandler.removeCallbacksAndMessages(null)
+        messageQueue.clear()
+        pendingMessage = null
+        timeoutRetries = 0
+
+        builder.setDeviceState(GBDevice.State.INITIALIZING)
+
+        // Send the fw version request directly, but queue everything else, otherwise the device does not respond to all
+        builder.write(*encodeCommand(ShokzCommand.FIRMWARE_GET))
+
+        pendingMessage = ShokzMessage(ShokzCommand.FIRMWARE_GET)
+        timeoutHandler.postDelayed({ onCommandTimeout() }, 2000L)
+        queueCommand(ShokzCommand.MEDIA_SOURCE_GET)
+        queueCommand(ShokzCommand.BATTERY_GET)
+        queueCommand(ShokzCommand.EQUALIZER_GET)
+        queueCommand(ShokzCommand.PLAYBACK_STATUS_GET)
+        queueCommand(ShokzCommand.VOLUME_GET)
+        queueCommand(ShokzCommand.MP3_PLAYBACK_MODE_GET)
+        queueCommand(ShokzCommand.CONTROLS_GET)
+        queueCommand(ShokzCommand.LANGUAGE_GET)
+
+        return builder
+    }
+
+    override fun dispose() {
+        synchronized(ConnectionMonitor) {
+            timeoutHandler.removeCallbacksAndMessages(null)
+            super.dispose()
+        }
+    }
+
+    override fun onSocketRead(data: ByteArray) {
+        packetBuffer.put(data)
+        packetBuffer.flip()
+
+        while (packetBuffer.hasRemaining()) {
+            packetBuffer.mark()
+
+            if (packetBuffer.remaining() < 10) {
+                // not enough bytes for min packet
+                packetBuffer.reset()
+                break
+            }
+
+            val preamble = packetBuffer.getShort()
+            if (preamble != PACKET_PREAMBLE) {
+                LOG.warn("Unexpected byte 0x{} is not preamble, skipping 2b", preamble.toHexString())
+                continue
+            }
+
+            val packetLength = packetBuffer.getShort()
+            if (packetBuffer.remaining() < 4 + packetLength) {
+                // not enough bytes for packetIdx + packet
+                packetBuffer.reset()
+                break
+            }
+
+            packetBuffer.get().toInt() // always 1?
+            packetBuffer.get().toInt() // isAck?
+            packetBuffer.getShort() // always 0?
+            val payloadLength = packetBuffer.getShort().toInt() and 0xffff
+
+            if (packetBuffer.remaining() < 2 + payloadLength) {
+                // not enough bytes for payload + crc
+                packetBuffer.reset()
+                break
+            }
+
+            val crc = packetBuffer.getShort().toInt() and 0xffff
+            val payload = ByteArray(payloadLength)
+            packetBuffer.get(payload)
+
+            val expectedCrc = CheckSums.crc16_maxim(payload, 0, payload.size)
+            if (crc != expectedCrc) {
+                LOG.warn("Invalid CRC: got 0x{}, expected 0x{}", crc.toHexString(), expectedCrc.toHexString())
+                continue
+            }
+
+            var sendNext: Boolean
+            try {
+                sendNext = handlePayload(payload)
+            } catch (e: Exception) {
+                LOG.error("Failed to handle payload", e)
+                sendNext = true
+            }
+
+            if (sendNext) {
+                sendNextCommand()
+            }
+        }
+
+        packetBuffer.compact()
+    }
+
+    override fun onSendConfiguration(config: String) {
+        when (config) {
+            DeviceSettingsPreferenceConst.PREF_LANGUAGE -> setLanguage()
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_BLUETOOTH,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_MP3 -> setEqualizer(config)
+
+            DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE -> setMediaSource()
+            DeviceSettingsPreferenceConst.PREF_MEDIA_PLAYBACK_MODE -> setMediaPlaybackMode()
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION,
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN -> setControls()
+
+            else -> super.onSendConfiguration(config)
+        }
+    }
+
+    private fun setLanguage() {
+        val localeString: String = devicePrefs.getString("language", "en")
+        val language = ShokzLanguage.fromLocale(localeString) ?: run {
+            LOG.warn("Unknown language {}, falling back to english", localeString)
+            ShokzLanguage.ENGLISH
+        }
+        LOG.info("Setting language to {}", language)
+
+        queueCommand(
+            ShokzCommand.LANGUAGE_SET,
+            byteArrayOf(language.code.toByte(), 0x00, 0x00, 0x00)
+        )
+    }
+
+    private fun setEqualizer(config: String) {
+        val value: String = devicePrefs.getString(config, "standard")
+        val equalizer = ShokzEqualizer.fromPreference(value) ?: run {
+            LOG.warn("Unknown equalizer {}, falling back to standard", value)
+            ShokzEqualizer.STANDARD
+        }
+
+        LOG.info("Setting equalizer to {}", equalizer)
+
+        val args = when (equalizer) {
+            ShokzEqualizer.STANDARD,
+            ShokzEqualizer.SWIMMING -> {
+                byteArrayOf(
+                    equalizer.code.toByte(), 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00
+                )
+            }
+
+            ShokzEqualizer.VOCAL -> {
+                byteArrayOf(
+                    equalizer.code.toByte(), 0xfc.toByte(), 0x00, 0x03,
+                    0x02, 0x02, 0x00, 0x00
+                )
+            }
+        }
+        queueCommand(ShokzCommand.EQUALIZER_SET, args)
+    }
+
+    private fun setMediaSource() {
+        val value: String = devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE, "bluetooth")
+        val mediaSource = ShokzMediaSource.fromPreference(value) ?: run {
+            LOG.warn("Unknown media source {}, falling back to bluetooth", value)
+            ShokzMediaSource.BLUETOOTH
+        }
+
+        LOG.info("Setting media source to {}", mediaSource)
+
+        queueCommand(
+            ShokzCommand.MEDIA_SOURCE_SET,
+            byteArrayOf(mediaSource.code.toByte(), 0x00, 0x00, 0x00)
+        )
+    }
+
+    private fun setMediaPlaybackMode() {
+        val value: String = devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_MEDIA_PLAYBACK_MODE, "normal")
+        val playbackMode = ShokzMp3PlaybackMode.fromPreference(value) ?: run {
+            LOG.warn("Unknown playback mode {}, falling back to normal", value)
+            ShokzMp3PlaybackMode.NORMAL
+        }
+
+        LOG.info("Setting playback mode to {}", playbackMode)
+
+        queueCommand(
+            ShokzCommand.MP3_PLAYBACK_MODE_SET,
+            byteArrayOf(playbackMode.code.toByte(), 0x00, 0x00, 0x00)
+        )
+    }
+
+    private fun setControls() {
+        val valueLongPress: String = devicePrefs.getString(
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION,
+            "standard"
+        )
+        val valueVolumeUpDown: String = devicePrefs.getString(
+            DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN,
+            "standard"
+        )
+
+        val controls = when {
+            valueLongPress == "assistant" && valueVolumeUpDown == "media_source" -> ShokzControls.ASSISTANT__MEDIA_SOURCE
+            valueLongPress == "media_source" && valueVolumeUpDown == "assistant" -> ShokzControls.MEDIA_SOURCE__ASSISTANT
+            valueLongPress == "media_source" && valueVolumeUpDown == "media_source" -> ShokzControls.MEDIA_SOURCE__MEDIA_SOURCE
+            valueLongPress == "assistant" && valueVolumeUpDown == "assistant" -> ShokzControls.ASSISTANT__ASSISTANT
+            else -> {
+                LOG.warn(
+                    "Unknown controls {}/{}, falling back to {}",
+                    valueLongPress, valueVolumeUpDown,
+                    ShokzControls.ASSISTANT__MEDIA_SOURCE
+                )
+                ShokzControls.ASSISTANT__MEDIA_SOURCE
+            }
+        }
+
+        LOG.info("Setting controls to {}", controls)
+
+        queueCommand(
+            ShokzCommand.CONTROLS_SET,
+            byteArrayOf(controls.code.toByte(), 0x00, 0x00, 0x00)
+        )
+    }
+
+    private fun handlePayload(payload: ByteArray): Boolean {
+        if (LOG.isTraceEnabled) {
+            LOG.trace("Processing payload: {}", payload.toHexString())
+        }
+
+        val buf = ByteBuffer.wrap(payload).order(ByteOrder.LITTLE_ENDIAN)
+        val unk1 = buf.getInt() // 0x01
+        if (unk1 != 0x01) {
+            LOG.warn("Unexpected unk1 0x{}", unk1.toHexString())
+            return true
+        }
+        val len = buf.getInt()
+        if (len != buf.remaining()) {
+            LOG.warn("Unexpected number of bytes in payload: got 0x{}, expected 0x{}", buf.remaining(), len)
+            return true
+        }
+        val unk2 = buf.getInt() // 0x02
+        if (unk2 != 0x02) {
+            LOG.warn("Unexpected unk2 0x{}", unk2.toHexString())
+            return true
+        }
+        val unk3 = buf.getInt() // 0x04
+        if (unk3 != 0x04) {
+            LOG.warn("Unexpected unk3 0x{}", unk3.toHexString())
+            return true
+        }
+        val group = buf.getInt()
+        val unk4 = buf.getInt() // 0x03
+        if (unk4 != 0x03) {
+            LOG.warn("Unexpected unk4 0x{}", unk4.toHexString())
+            return true
+        }
+        val unk5 = buf.getInt() // 0x04
+        if (unk5 != 0x04) {
+            LOG.warn("Unexpected unk5 0x{}", unk5.toHexString())
+            return true
+        }
+        val code = buf.getInt()
+        val unk6 = buf.getInt() // 0x04
+        if (unk6 != 0x04) {
+            LOG.warn("Unexpected unk6 0x{}", unk6.toHexString())
+            return true
+        }
+        val argsLength = buf.getInt()
+        val args = ByteArray(argsLength)
+        buf.get(args)
+
+        val command = ShokzCommand.getCommand(group, code)
+        if (command == null) {
+            LOG.warn("Unknown command: group 0x{}, code 0x{}", group.toHexString(), code.toHexString())
+            return true
+        }
+
+        handleCommand(command, args)
+
+        return pendingMessage?.let { msg ->
+            (msg.command.code or MASK_RESPONSE) == command.code
+        } ?: false
+    }
+
+    private fun handleCommand(command: ShokzCommand, args: ByteArray) {
+        val buf = ByteBuffer.wrap(args).order(ByteOrder.LITTLE_ENDIAN)
+
+        LOG.debug("Handling command {} args={}", command, args.toHexString())
+
+        when (command) {
+            ShokzCommand.FIRMWARE_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val firmware = buf.stringUntilNullTerminator()
+                if (firmware == null) {
+                    LOG.warn("Failed to get firmware from payload")
+                    return
+                }
+                LOG.info("Got firmware: {}", firmware)
+
+                val versionInfoEvent = GBDeviceEventVersionInfo()
+                versionInfoEvent.fwVersion = firmware
+                evaluateGBDeviceEvent(versionInfoEvent)
+
+                gbDevice.setUpdateState(GBDevice.State.INITIALIZED, context)
+            }
+
+            ShokzCommand.MEDIA_SOURCE_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val code = buf.get().toInt() and 0xff
+                val mode = ShokzMediaSource.fromCode(code)
+                if (mode == null) {
+                    LOG.warn("Unknown mode code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got mode: {}", mode)
+
+                evaluateGBDeviceEvent(
+                    GBDeviceEventUpdatePreferences(
+                        DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE,
+                        mode.name.lowercase()
+                    )
+                )
+            }
+
+            ShokzCommand.BATTERY_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val batteryPercentage = ((buf.get().toInt() and 0xff) + 1) * 10
+
+                LOG.info("Got battery: {}%", batteryPercentage)
+
+                val batteryInfoEvent = GBDeviceEventBatteryInfo()
+                batteryInfoEvent.level = batteryPercentage
+                evaluateGBDeviceEvent(batteryInfoEvent)
+            }
+
+            ShokzCommand.EQUALIZER_RET, ShokzCommand.EQUALIZER_ACK -> {
+                if (command == ShokzCommand.EQUALIZER_RET) {
+                    val zero = buf.get().toInt()
+                    if (zero != 0) {
+                        LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                        return
+                    }
+                }
+
+                val code = buf.get().toInt() and 0xff
+                val equalizer = ShokzEqualizer.fromCode(code)
+                if (equalizer == null) {
+                    LOG.warn("Unknown equalizer code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got equalizer: {}", equalizer)
+
+                val mediaSourceValue: String =
+                    devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE, "bluetooth")
+                val mediaSource = ShokzMediaSource.fromPreference(mediaSourceValue) ?: run {
+                    LOG.warn("Unknown media source {}, falling back to bluetooth", mediaSourceValue)
+                    ShokzMediaSource.BLUETOOTH
+                }
+
+                devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_LANGUAGE, "en")
+                evaluateGBDeviceEvent(
+                    GBDeviceEventUpdatePreferences(
+                        when (mediaSource) {
+                            ShokzMediaSource.BLUETOOTH -> DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_BLUETOOTH
+                            ShokzMediaSource.MP3 -> DeviceSettingsPreferenceConst.PREF_SHOKZ_EQUALIZER_MP3
+                        },
+                        equalizer.name.lowercase()
+                    )
+                )
+            }
+
+            ShokzCommand.PLAYBACK_STATUS_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val code = buf.get().toInt() and 0xff
+                val playbackStatus = ShokzPlaybackStatus.fromCode(code)
+                if (playbackStatus == null) {
+                    LOG.warn("Unknown playback status code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got playback status: {}", playbackStatus)
+
+                // TODO handle
+            }
+
+            ShokzCommand.VOLUME_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val percentage = floor(((buf.get().toInt() and 0xff) / 16) * 100 + 0.5)
+
+                LOG.info("Got volume: {}", percentage)
+
+                // TODO handle
+            }
+
+            ShokzCommand.MP3_PLAYBACK_MODE_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val code = buf.get().toInt() and 0xff
+                val playbackMode = ShokzMp3PlaybackMode.fromCode(code)
+                if (playbackMode == null) {
+                    LOG.warn("Unknown mp3 playback mode code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got mp3 playback mode: {}", playbackMode)
+
+                evaluateGBDeviceEvent(
+                    GBDeviceEventUpdatePreferences(
+                        DeviceSettingsPreferenceConst.PREF_MEDIA_PLAYBACK_MODE,
+                        playbackMode.name.lowercase()
+                    )
+                )
+            }
+
+            ShokzCommand.CONTROLS_RET -> {
+                val zero = buf.get().toInt()
+                if (zero != 0) {
+                    LOG.warn("Unexpected non-zero byte 0x{} for {}", zero.toHexString(), command)
+                    return
+                }
+                val code = buf.get().toInt() and 0xff
+                val controls = ShokzControls.fromCode(code)
+                if (controls == null) {
+                    LOG.warn("Unknown controls code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got controls: {}", controls)
+
+                val eventUpdatePreferences = GBDeviceEventUpdatePreferences()
+
+                eventUpdatePreferences.withPreference(
+                    DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_LONG_PRESS_MULTI_FUNCTION,
+                    when (controls) {
+                        ShokzControls.ASSISTANT__MEDIA_SOURCE, ShokzControls.ASSISTANT__ASSISTANT -> "assistant"
+                        ShokzControls.MEDIA_SOURCE__ASSISTANT, ShokzControls.MEDIA_SOURCE__MEDIA_SOURCE -> "media_source"
+                    }
+                ).withPreference(
+                    DeviceSettingsPreferenceConst.PREF_SHOKZ_CONTROLS_SIMULTANEOUS_VOLUME_UP_DOWN,
+                    when (controls) {
+                        ShokzControls.ASSISTANT__MEDIA_SOURCE, ShokzControls.MEDIA_SOURCE__MEDIA_SOURCE -> "media_source"
+                        ShokzControls.MEDIA_SOURCE__ASSISTANT, ShokzControls.ASSISTANT__ASSISTANT -> "assistant"
+                    }
+                )
+
+                evaluateGBDeviceEvent(eventUpdatePreferences)
+            }
+
+            ShokzCommand.LANGUAGE_RET -> {
+                buf.getShort() // 0
+                val code = buf.get().toInt() and 0xff
+                val language = ShokzLanguage.fromCode(code)
+                if (language == null) {
+                    LOG.warn("Unknown language code 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got language: {}", language)
+
+                evaluateGBDeviceEvent(
+                    GBDeviceEventUpdatePreferences(
+                        DeviceSettingsPreferenceConst.PREF_LANGUAGE,
+                        language.locale
+                    )
+                )
+            }
+
+            ShokzCommand.MEDIA_SOURCE_NOTIFY -> {
+                val code = buf.get().toInt() and 0xff
+                val mediaSource = ShokzMediaSource.fromCode(code)
+                if (mediaSource == null) {
+                    LOG.warn("Unknown media source 0x{}", code.toHexString())
+                    return
+                }
+
+                LOG.info("Got media source change: {}", mediaSource)
+
+                evaluateGBDeviceEvent(
+                    GBDeviceEventUpdatePreferences(
+                        DeviceSettingsPreferenceConst.PREF_MEDIA_SOURCE,
+                        mediaSource.name.lowercase()
+                    )
+                )
+            }
+
+            else -> LOG.warn("Unhandled command {}, args={}", command, args.toHexString())
+        }
+    }
+
+    private fun queueCommand(
+        command: ShokzCommand,
+        args: ByteArray = byteArrayOf()
+    ) {
+        messageQueue.add(ShokzMessage(command, args))
+
+        if (pendingMessage == null) {
+            sendNextCommand()
+        }
+    }
+
+    private fun onCommandTimeout() {
+        if (timeoutRetries++ < 3) {
+            LOG.warn("Timed out waiting for response, retrying attempt {}", timeoutRetries)
+            pendingMessage?.let { msg ->
+                sendMessage(msg)
+                return
+            }
+        }
+        LOG.warn("Timed out waiting for response, giving up")
+        sendNextCommand()
+    }
+
+    private fun sendNextCommand() {
+        timeoutHandler.removeCallbacksAndMessages(null)
+        timeoutRetries = 0
+
+        pendingMessage = messageQueue.poll()
+        pendingMessage?.let { msg ->
+            LOG.debug("Sending next command in queue: {}", msg.command)
+            sendMessage(msg)
+            return
+        }
+        LOG.debug("No more commands in the queue")
+    }
+
+    private fun sendMessage(message: ShokzMessage) {
+        val builder = createTransactionBuilder(message.command.name.lowercase())
+        builder.write(*encodeCommand(message.command, message.args))
+        builder.queue()
+
+        timeoutHandler.postDelayed({ onCommandTimeout() }, 2000L)
+    }
+
+    companion object {
+        private val LOG = LoggerFactory.getLogger(ShokzSupport::class.java)
+        private const val MAX_MTU: Int = 2048
+        private const val PACKET_PREAMBLE: Short = 0x5aa5.toShort() // LE
+        private const val MASK_RESPONSE: Int = 0x8000
+
+        // This does not show up in the discovered services?
+        private val UUID_SERVICE_SHOKZ: UUID = UUID.fromString("0000fef0-0000-1000-8000-00805f9b34fb")
+
+        /// Each command seems to have the following format (all u32 LE)
+        /// 0x01 length 0x02 0x04 group 0x03 0x04 command 0x04 args_length args
+        fun encodeCommand(
+            command: ShokzCommand,
+            args: ByteArray = byteArrayOf()
+        ): ByteArray {
+            val buf = ByteBuffer.allocate(52 + args.size).order(ByteOrder.LITTLE_ENDIAN)
+            buf.putShort(PACKET_PREAMBLE)
+            buf.putShort((buf.limit() - 8).toShort())
+            buf.putInt(0x01)
+            buf.putShort((buf.limit() - 12).toShort())
+            // CRC will be added later
+            buf.position(buf.position() + 2)
+            buf.putInt(0x01)
+            buf.putInt(buf.limit() - 20)
+            buf.putInt(0x02)
+            buf.putInt(0x04)
+            buf.putInt(command.group)
+            buf.putInt(0x03)
+            buf.putInt(0x04)
+            buf.putInt(command.code)
+            buf.putInt(0x04)
+            buf.putInt(args.size)
+            buf.put(args)
+
+            buf.putShort(10, CheckSums.crc16_maxim(buf.array(), 12, buf.limit() - 12).toShort())
+
+            return buf.array()
+        }
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/XiaomiSppSupport.java

@@ -46,7 +46,7 @@ import nodomain.freeyourgadget.gadgetbridge.util.GB;
 public class XiaomiSppSupport extends XiaomiConnectionSupport {
     private static final Logger LOG = LoggerFactory.getLogger(XiaomiSppSupport.class);
 
-    AbstractBTBRDeviceSupport commsSupport = new AbstractBTBRDeviceSupport(LOG) {
+    AbstractBTBRDeviceSupport commsSupport = new AbstractBTBRDeviceSupport(LOG, 1024) {
         @Override
         public boolean useAutoConnect() {
             return mXiaomiSupport.useAutoConnect();

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/CheckSums.java

@@ -59,7 +59,7 @@ public class CheckSums {
     public static int getCRC16(byte[] seq) {
         return getCRC16(seq, 0xFFFF);
     }
-    
+
     public static int getCRC16(byte[] seq, int crc) {
         for (byte b : seq) {
             crc = ((crc >>> 8) | (crc << 8)) & 0xffff;
@@ -71,7 +71,7 @@ public class CheckSums {
         crc &= 0xffff;
         return crc;
     }
-    
+
     public static int getCRC16ansi(byte[] seq) {
         int crc = 0xffff;
         int polynomial = 0xA001;
@@ -190,4 +190,24 @@ public class CheckSums {
         md.update(str.getBytes(StandardCharsets.UTF_8));
         return GB.hexdump(md.digest()).toLowerCase(Locale.ROOT);
     }
+
+    public static int crc16_maxim(final byte[] data, final int offset, final int length) {
+        // Reflected polynomial 0x8005 -> 0xA001 when shifting right (LSB first)
+        final int poly = 0xA001;
+        int crc = 0x0000;
+
+        for (int i = offset; i < offset + length; i++) {
+            final byte b = data[i];
+            crc ^= (b & 0xFF);
+            for (int j = 0; j < 8; j++) {
+                if ((crc & 0x0001) != 0) {
+                    crc = (crc >>> 1) ^ poly;
+                } else {
+                    crc >>>= 1;
+                }
+            }
+        }
+
+        return crc ^ 0xFFFF;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/kotlin/ByteArrayExtensions.kt

@@ -0,0 +1,13 @@
+package nodomain.freeyourgadget.gadgetbridge.util.kotlin
+
+fun ByteArray.startsWith(prefix: ByteArray): Boolean {
+    if (prefix.size > this.size) {
+        return false
+    }
+    for (i in prefix.indices) {
+        if (this[i] != prefix[i]) {
+            return false
+        }
+    }
+    return true
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/kotlin/ByteBufferExtensions.kt

@@ -0,0 +1,8 @@
+package nodomain.freeyourgadget.gadgetbridge.util.kotlin
+
+import nodomain.freeyourgadget.gadgetbridge.util.StringUtils
+import java.nio.ByteBuffer
+
+fun ByteBuffer.stringUntilNullTerminator(): String? {
+    return StringUtils.untilNullTerminator(this)
+}

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

@@ -2708,6 +2708,7 @@
         <item name="ms_MY">@string/bahasa_melayu</item>
         <item name="fa_IR">@string/persian</item>
         <!-- simplified versions, without a country -->
+        <item name="zh">@string/chinese</item>
         <item name="en">@string/english</item>
         <item name="ko">@string/korean</item>
         <item name="ja">@string/japanese</item>
@@ -2773,6 +2774,7 @@
         <item>ms_MY</item>
         <item>fa_IR</item>
         <!-- simplified versions, without a country -->
+        <item>zh</item>
         <item>en</item>
         <item>ko</item>
         <item>ja</item>
@@ -4119,6 +4121,53 @@
         <item>custom_2</item>
     </string-array>
 
+    <string-array name="media_source_names">
+        <item>@string/menuitem_bluetooth</item>
+        <item>@string/mp3</item>
+    </string-array>
+    <string-array name="media_source_values">
+        <item>bluetooth</item>
+        <item>mp3</item>
+    </string-array>
+
+    <string-array name="shokz_equalizer_bluetooth_names">
+        <item>@string/equalizer_preset_standard</item>
+        <item>@string/sony_equalizer_preset_vocal</item>
+    </string-array>
+    <string-array name="shokz_equalizer_bluetooth_values">
+        <item>standard</item>
+        <item>vocal</item>
+    </string-array>
+
+    <string-array name="shokz_equalizer_mp3_names">
+        <item>@string/equalizer_preset_standard</item>
+        <item>@string/Swimming</item>
+    </string-array>
+    <string-array name="shokz_equalizer_mp3_values">
+        <item>standard</item>
+        <item>swimming</item>
+    </string-array>
+
+    <string-array name="media_playback_mode_names">
+        <item>@string/media_playback_mode_normal</item>
+        <item>@string/media_playback_mode_shuffle</item>
+        <item>@string/media_playback_mode_repeat</item>
+    </string-array>
+    <string-array name="media_playback_mode_values">
+        <item>normal</item>
+        <item>shuffle</item>
+        <item>repeat</item>
+    </string-array>
+
+    <string-array name="shokz_controls_names">
+        <item>@string/moondrop_touch_action_assistant</item>
+        <item>@string/media_source_switching_bluetooth_mp3</item>
+    </string-array>
+    <string-array name="shokz_controls_values">
+        <item>assistant</item>
+        <item>media_source</item>
+    </string-array>
+
     <string-array name="sony_automatic_power_off_names">
         <item>@string/sony_automatic_power_off_off</item>
         <item>@string/sony_automatic_power_off_5_min</item>

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

@@ -1208,6 +1208,7 @@
     <string name="manual">Manual</string>
     <string name="simplified_chinese">Chinese (Simplified)</string>
     <string name="traditional_chinese">Chinese (Traditional)</string>
+    <string name="chinese">Chinese</string>
     <string name="english">English</string>
     <string name="english_au">English (Australia)</string>
     <string name="english_ca">English (Canada)</string>
@@ -4205,4 +4206,15 @@
     <string name="help">Help</string>
     <string name="cannot_open_help_url">Could not open URL</string>
     <string name="auth_settings">Authentication settings</string>
+    <string name="devicetype_shokz_openswim_pro">Shokz OpenSwim Pro</string>
+    <string name="equalizer_preset_standard">Standard</string>
+    <string name="media_playback_mode">Playback mode</string>
+    <string name="media_playback_mode_normal">Normal</string>
+    <string name="media_playback_mode_shuffle">Shuffle</string>
+    <string name="media_playback_mode_repeat">Repeat</string>
+    <string name="media_source">Media source</string>
+    <string name="mp3">MP3</string>
+    <string name="media_source_switching_bluetooth_mp3">Switch media source (Bluetooth/MP3)</string>
+    <string name="shokz_controls_long_press_multi_function">Long-press the multi-function button</string>
+    <string name="shokz_controls_simultaneous_volume_up_down">Long-press volume up and down simultaneously</string>
 </resources>

app/src/main/res/xml/devicesettings_media_source.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ListPreference
+        android:defaultValue="off"
+        android:entries="@array/media_source_names"
+        android:entryValues="@array/media_source_values"
+        android:icon="@drawable/ic_music_note"
+        android:key="pref_media_source"
+        android:title="@string/media_source"
+        app:useSimpleSummaryProvider="true" />
+
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/devicesettings_playback_mode.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ListPreference
+        android:defaultValue="normal"
+        android:entries="@array/media_playback_mode_names"
+        android:entryValues="@array/media_playback_mode_values"
+        android:icon="@drawable/ic_play"
+        android:key="pref_media_playback_mode"
+        app:useSimpleSummaryProvider="true"
+        android:title="@string/media_playback_mode" />
+
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/devicesettings_shokz_controls.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ListPreference
+        android:defaultValue=""
+        android:entries="@array/shokz_controls_names"
+        android:entryValues="@array/shokz_controls_values"
+        android:icon="@drawable/ic_touch"
+        android:key="shokz_controls_long_press_multi_function"
+        android:title="@string/shokz_controls_long_press_multi_function"
+        app:useSimpleSummaryProvider="true" />
+
+    <ListPreference
+        android:defaultValue=""
+        android:entries="@array/shokz_controls_names"
+        android:entryValues="@array/shokz_controls_values"
+        android:icon="@drawable/ic_arrows_up_down"
+        android:key="shokz_controls_simultaneous_volume_up_down"
+        android:title="@string/shokz_controls_simultaneous_volume_up_down"
+        app:useSimpleSummaryProvider="true" />
+
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/devicesettings_shokz_equalizer.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ListPreference
+        android:defaultValue="standard"
+        android:entries="@array/shokz_equalizer_bluetooth_names"
+        android:entryValues="@array/shokz_equalizer_bluetooth_values"
+        android:icon="@drawable/ic_equalizer"
+        android:key="pref_shokz_equalizer_bluetooth"
+        app:useSimpleSummaryProvider="true"
+        android:title="@string/sony_equalizer" />
+
+    <ListPreference
+        android:defaultValue="standard"
+        android:entries="@array/shokz_equalizer_mp3_names"
+        android:entryValues="@array/shokz_equalizer_mp3_values"
+        android:icon="@drawable/ic_equalizer"
+        android:key="pref_shokz_equalizer_mp3"
+        app:useSimpleSummaryProvider="true"
+        android:title="@string/sony_equalizer" />
+
+</androidx.preference.PreferenceScreen>

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/service/devices/shokz/ShokzSupportTest.kt

@@ -0,0 +1,14 @@
+package nodomain.freeyourgadget.gadgetbridge.service.devices.shokz
+
+import org.junit.Assert.*
+import org.junit.Test
+
+class ShokzSupportTest {
+    @Test
+    fun testEncodeCommand() {
+        assertEquals(
+            "a55a2c000100000028005ab701000000200000000200000004000000020000000300000004000000020000000400000000000000",
+            ShokzSupport.encodeCommand(ShokzCommand.FIRMWARE_GET).toHexString()
+        )
+    }
+}