Zepp OS: Add service to query supported services

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/Huami2021Support.java

@@ -114,6 +114,7 @@ import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.service
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsCannedMessagesService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsLogsService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsNotificationService;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsServicesService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsShortcutCardsService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsConfigService;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.services.ZeppOsContactsService;
@@ -138,6 +139,7 @@ public abstract class Huami2021Support extends HuamiSupport implements ZeppOsFil
     private boolean heartRateRealtimeStarted;
 
     // Services
+    private final ZeppOsServicesService servicesService = new ZeppOsServicesService(this);
     private final ZeppOsFileTransferService fileTransferService = new ZeppOsFileTransferService(this);
     private final ZeppOsConfigService configService = new ZeppOsConfigService(this);
     private final ZeppOsAgpsService agpsService = new ZeppOsAgpsService(this);
@@ -157,6 +159,7 @@ public abstract class Huami2021Support extends HuamiSupport implements ZeppOsFil
     private final ZeppOsLogsService logsService = new ZeppOsLogsService(this);
 
     private final Map<Short, AbstractZeppOsService> mServiceMap = new LinkedHashMap<Short, AbstractZeppOsService>() {{
+        put(servicesService.getEndpoint(), servicesService);
         put(fileTransferService.getEndpoint(), fileTransferService);
         put(configService.getEndpoint(), configService);
         put(agpsService.getEndpoint(), agpsService);

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

@@ -0,0 +1,108 @@
+/*  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.zeppos.services;
+
+import android.annotation.SuppressLint;
+import android.widget.Toast;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst;
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventUpdatePreferences;
+import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.Huami2021Support;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.zeppos.AbstractZeppOsService;
+import nodomain.freeyourgadget.gadgetbridge.util.GB;
+import nodomain.freeyourgadget.gadgetbridge.util.Prefs;
+import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
+
+public class ZeppOsServicesService extends AbstractZeppOsService {
+    private static final Logger LOG = LoggerFactory.getLogger(ZeppOsServicesService.class);
+
+    private static final short ENDPOINT = 0x0000;
+
+    public static final byte CMD_GET_LIST = 0x03;
+    public static final byte CMD_RET_LIST = 0x04;
+
+    public ZeppOsServicesService(final Huami2021Support support) {
+        super(support);
+    }
+
+    @Override
+    public short getEndpoint() {
+        return ENDPOINT;
+    }
+
+    @Override
+    public boolean isEncrypted() {
+        return false;
+    }
+
+    @Override
+    public void handlePayload(final byte[] payload) {
+        switch (payload[0]) {
+            case CMD_RET_LIST:
+                handleSupportedServices(payload);
+                break;
+            default:
+                LOG.warn("Unexpected services payload byte {}", String.format("0x%02x", payload[0]));
+        }
+    }
+
+    @Override
+    public void initialize(final TransactionBuilder builder) {
+        //requestServices(builder);
+    }
+
+    public void requestServices(final TransactionBuilder builder) {
+        write(builder, CMD_GET_LIST);
+    }
+
+    private void handleSupportedServices(final byte[] payload) {
+        final ByteBuffer buf = ByteBuffer.wrap(payload).order(ByteOrder.LITTLE_ENDIAN);
+        buf.get(); // discard first byte
+        final short numServices = buf.getShort();
+
+        LOG.info("Number of services: {}", numServices);
+
+        for (int i = 0; i < numServices; i++) {
+            final short endpoint = buf.getShort();
+            final byte encryptedByte = buf.get();
+            final Boolean encrypted = booleanFromByte(encryptedByte);
+
+            LOG.debug("Service: endpoint={} encrypted={}", String.format("%04x", endpoint), encrypted);
+
+            // TODO use this to initialize the services supported by the device
+        }
+
+        final int remainingBytes = buf.limit() - buf.position();
+        if (remainingBytes != 0) {
+            LOG.warn("There are {} bytes remaining in the buffer", remainingBytes);
+        }
+    }
+}