multi-device-support (#2526)

this PR aims to add device for multiple connected devices at once.

A lot of stuff already works, some things need to be done:

- [x] change DeviceCommunicationService to hold multiple devices and supports
- [x] implement connect / disconnect logic
- [x] widgets, not really suited for multiple devices, so far
- [x] change the notification to show multiple devices
- [ ] change GBDeviceService#onFindDevice and similar API functions to target individual devices, not all connected.
- [x] move auto-reconnect setting to device settings
- [x] fix music event crash
- [x] work out behaviour when pressing "connect" from notification
- [ ] handle service crashes
- [ ] suit coordinator methods for multiple devices of same kind
- [x] change ACL_CONNECTED receiver to connect to devices that are not currently registered in DeviceCommunicationService
- [ ] adjust after-boot auto-connection logic
- [ ] fix hanging device support. Device says disconnected, GB says connected
- [x] firmware updater doesn't work

My attempt to make onFindDevice work was to change the arguments to ```EventHandler#onFindDevice(GBDevice device, boolean start)```.
The Problem is that this forces the device-specific implementations to also accept GBDevice as an argument.

Co-authored-by: Daniel Dakhno <dakhnod@gmail.com>
Co-authored-by: Andreas Shimokawa <shimokawa@fsfe.org>
Co-authored-by: dakhnod <dakhnod@gmail.com>
Reviewed-on: https://codeberg.org/Freeyourgadget/Gadgetbridge/pulls/2526
Co-authored-by: dakhnod <dakhnod@noreply.codeberg.org>
Co-committed-by: dakhnod <dakhnod@noreply.codeberg.org>

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/DebugActivity.java

@@ -68,6 +68,7 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
@@ -272,26 +273,28 @@ public class DebugActivity extends AbstractGBActivity {
 
                 if (context instanceof GBApplication) {
                     GBApplication gbApp = (GBApplication) context;
-                    final GBDevice device = gbApp.getDeviceManager().getSelectedDevice();
+                    final List<GBDevice> devices = gbApp.getDeviceManager().getSelectedDevices();
-                    if (device != null) {
+                    if(devices.size() == 0){
-                        new DatePickerDialog(DebugActivity.this, new DatePickerDialog.OnDateSetListener() {
+                        GB.toast("Device not selected/connected", Toast.LENGTH_LONG, GB.INFO);
-                            @Override
+                        return;
-                            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
+                    }
-                                Calendar date = Calendar.getInstance();
+                    new DatePickerDialog(DebugActivity.this, new DatePickerDialog.OnDateSetListener() {
-                                date.set(year, monthOfYear, dayOfMonth);
+                        @Override
+                        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
+                            Calendar date = Calendar.getInstance();
+                            date.set(year, monthOfYear, dayOfMonth);
 
-                                long timestamp = date.getTimeInMillis() - 1000;
+                            long timestamp = date.getTimeInMillis() - 1000;
-                                GB.toast("Setting lastSyncTimeMillis: " + timestamp, Toast.LENGTH_LONG, GB.INFO);
+                            GB.toast("Setting lastSyncTimeMillis: " + timestamp, Toast.LENGTH_LONG, GB.INFO);
 
+                            for(GBDevice device : devices){
                                 SharedPreferences.Editor editor = GBApplication.getDeviceSpecificSharedPrefs(device.getAddress()).edit();
                                 editor.remove("lastSyncTimeMillis"); //FIXME: key reconstruction is BAD
                                 editor.putLong("lastSyncTimeMillis", timestamp);
                                 editor.apply();
                             }
-                        }, currentDate.get(Calendar.YEAR), currentDate.get(Calendar.MONTH), currentDate.get(Calendar.DATE)).show();
+                        }
-                    } else {
+                    }, currentDate.get(Calendar.YEAR), currentDate.get(Calendar.MONTH), currentDate.get(Calendar.DATE)).show();
-                        GB.toast("Device not selected/connected", Toast.LENGTH_LONG, GB.INFO);
-                    }
                 }
 
 
@@ -411,8 +414,8 @@ public class DebugActivity extends AbstractGBActivity {
             public void onClick(View v) {
                 Context context = getApplicationContext();
                 GBApplication gbApp = (GBApplication) context;
-                final GBDevice device = gbApp.getDeviceManager().getSelectedDevice();
+                List<GBDevice> devices = gbApp.getDeviceManager().getSelectedDevices();
-                if (device != null) {
+                for(GBDevice device : devices){
                     GBApplication.deleteDeviceSpecificSharedPrefs(device.getAddress());
                 }
             }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FwAppInstallerActivity.java

@@ -214,6 +214,19 @@ public class FwAppInstallerActivity extends AbstractGBActivity implements Instal
         } else {
             setInfoText(getString(R.string.installer_activity_wait_while_determining_status));
 
+            List<GBDevice> selectedDevices = GBApplication.app().getDeviceManager().getSelectedDevices();
+            if(selectedDevices.size() == 0){
+                GB.toast("please connect the device you want to send to", Toast.LENGTH_LONG, GB.ERROR);
+                finish();
+                return;
+            }
+            if(selectedDevices.size() != 1){
+                GB.toast("please connect ONLY the device you want to send to", Toast.LENGTH_LONG, GB.ERROR);
+                finish();
+                return;
+            }
+            device = selectedDevices.get(0);
+
             // needed to get the device
             if (device == null || !device.isConnected()) {
                 connect();
@@ -245,14 +258,17 @@ public class FwAppInstallerActivity extends AbstractGBActivity implements Instal
         List<DeviceCoordinator> allCoordinators = DeviceHelper.getInstance().getAllCoordinators();
         List<DeviceCoordinator> sortedCoordinators = new ArrayList<>(allCoordinators.size());
 
-        GBDevice connectedDevice = deviceManager.getSelectedDevice();
+        List<GBDevice> devices = deviceManager.getSelectedDevices();
-        if (connectedDevice != null && connectedDevice.isConnected()) {
+        for(GBDevice connectedDevice : devices){
-            DeviceCoordinator coordinator = DeviceHelper.getInstance().getCoordinator(connectedDevice);
+            if (connectedDevice.isConnected()) {
-            if (coordinator != null) {
+                DeviceCoordinator coordinator = DeviceHelper.getInstance().getCoordinator(connectedDevice);
-                connectedCoordinators.add(coordinator);
+                if (coordinator != null) {
+                    connectedCoordinators.add(coordinator);
+                }
             }
         }
 
+
         sortedCoordinators.addAll(connectedCoordinators);
         for (DeviceCoordinator coordinator : allCoordinators) {
             if (!connectedCoordinators.contains(coordinator)) {

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

@@ -811,6 +811,8 @@ public class DeviceSpecificSettingsFragment extends PreferenceFragmentCompat imp
         int[] supportedSettings = coordinator.getSupportedDeviceSpecificSettings(device);
         String[] supportedLanguages = coordinator.getSupportedLanguageSettings(device);
 
+        supportedSettings = ArrayUtils.insert(0, supportedSettings, coordinator.getSupportedDeviceSpecificConnectionSettings());
+
         if (supportedLanguages != null) {
             supportedSettings = ArrayUtils.insert(0, supportedSettings, R.xml.devicesettings_language_generic);
         }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/adapter/GBDeviceAdapterv2.java

@@ -154,7 +154,7 @@ public class GBDeviceAdapterv2 extends RecyclerView.Adapter<GBDeviceAdapterv2.Vi
             public boolean onLongClick(View v) {
                 if (device.getState() != GBDevice.State.NOT_CONNECTED) {
                     showTransientSnackbar(R.string.controlcenter_snackbar_disconnecting);
-                    GBApplication.deviceService().disconnect();
+                    GBApplication.deviceService().disconnect(device);
                 }
                 return true;
             }
@@ -261,7 +261,7 @@ public class GBDeviceAdapterv2 extends RecyclerView.Adapter<GBDeviceAdapterv2.Vi
         );
 
         //device specific settings
-        holder.deviceSpecificSettingsView.setVisibility(coordinator.getSupportedDeviceSpecificSettings(device) != null ? View.VISIBLE : View.GONE);
+        holder.deviceSpecificSettingsView.setVisibility(coordinator.getSupportedDeviceSpecificConnectionSettings() != null ? View.VISIBLE : View.GONE);
         holder.deviceSpecificSettingsView.setOnClickListener(new View.OnClickListener()
 
                                                 {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractBLClassicDeviceCoordinator.java

@@ -0,0 +1,8 @@
+package nodomain.freeyourgadget.gadgetbridge.devices;
+
+public abstract class AbstractBLClassicDeviceCoordinator extends AbstractDeviceCoordinator {
+    @Override
+    public ConnectionType getConnectionType() {
+        return ConnectionType.BL_CLASSIC;
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractBLEDeviceCoordinator.java

@@ -0,0 +1,8 @@
+package nodomain.freeyourgadget.gadgetbridge.devices;
+
+public abstract class AbstractBLEDeviceCoordinator extends AbstractDeviceCoordinator{
+    @Override
+    public ConnectionType getConnectionType() {
+        return ConnectionType.BLE;
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/AbstractDeviceCoordinator.java

@@ -26,6 +26,7 @@ import android.bluetooth.le.ScanFilter;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import org.apache.commons.lang3.ArrayUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -37,6 +38,7 @@ import java.util.Collections;
 import de.greenrobot.dao.query.QueryBuilder;
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.GBException;
+import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSpecificSettingsCustomizer;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHelper;
@@ -61,6 +63,11 @@ public abstract class AbstractDeviceCoordinator implements DeviceCoordinator {
         return getSupportedType(candidate).isSupported();
     }
 
+    @Override
+    public ConnectionType getConnectionType() {
+        return ConnectionType.BOTH;
+    }
+
     @Override
     public boolean supports(GBDevice device) {
         return getDeviceType().equals(device.getType());
@@ -86,7 +93,7 @@ public abstract class AbstractDeviceCoordinator implements DeviceCoordinator {
     public void deleteDevice(final GBDevice gbDevice) throws GBException {
         LOG.info("will try to delete device: " + gbDevice.getName());
         if (gbDevice.isConnected() || gbDevice.isConnecting()) {
-            GBApplication.deviceService().disconnect();
+            GBApplication.deviceService().disconnect(gbDevice);
         }
         Prefs prefs = getPrefs();
 
@@ -258,9 +265,24 @@ public abstract class AbstractDeviceCoordinator implements DeviceCoordinator {
         return false;
     }
 
+    @Override
+    public int[] getSupportedDeviceSpecificConnectionSettings() {
+        int[] settings = new int[0];
+        ConnectionType connectionType = getConnectionType();
+
+        if(connectionType.usesBluetoothLE()){
+            settings = ArrayUtils.insert(0, settings, R.xml.devicesettings_reconnect_ble);
+        }
+        if(connectionType.usesBluetoothClassic()){
+            settings = ArrayUtils.insert(0, settings, R.xml.devicesettings_reconnect_bl_classic);
+        }
+
+        return settings;
+    }
+
     @Override
     public int[] getSupportedDeviceSpecificSettings(GBDevice device) {
-        return null;
+        return new int[0];
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/DeviceCoordinator.java

@@ -77,6 +77,27 @@ public interface DeviceCoordinator {
      */
     int BONDING_STYLE_LAZY = 4;
 
+    enum ConnectionType{
+        BLE(false, true),
+        BL_CLASSIC(true, false),
+        BOTH(true, true)
+        ;
+        boolean usesBluetoothClassic, usesBluetoothLE;
+
+        ConnectionType(boolean usesBluetoothClassic, boolean usesBluetoothLE) {
+            this.usesBluetoothClassic = usesBluetoothClassic;
+            this.usesBluetoothLE = usesBluetoothLE;
+        }
+
+        public boolean usesBluetoothLE(){
+            return usesBluetoothLE;
+        }
+
+        public boolean usesBluetoothClassic(){
+            return usesBluetoothClassic;
+        }
+    }
+
     /**
      * Checks whether this coordinator handles the given candidate.
      * Returns the supported device type for the given candidate or
@@ -88,6 +109,13 @@ public interface DeviceCoordinator {
     @NonNull
     DeviceType getSupportedType(GBDeviceCandidate candidate);
 
+    /**
+     * Returns the type of connection, Classic of BLE
+     *
+     * @return ConnectionType
+     */
+    ConnectionType getConnectionType();
+
     /**
      * Checks whether this coordinator handles the given candidate.
      *
@@ -363,6 +391,13 @@ public interface DeviceCoordinator {
      */
     boolean supportsUnicodeEmojis();
 
+    /**
+     * Returns device specific settings related to connection
+     *
+     * @return int[]
+     */
+    int[] getSupportedDeviceSpecificConnectionSettings();
+
     /**
      * Indicates which device specific settings the device supports (not per device type or family, but unique per device).
      */

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/DeviceManager.java

@@ -67,7 +67,7 @@ public class DeviceManager {
      * This allows direct access to the list from ListAdapters.
      */
     private final List<GBDevice> deviceList = new ArrayList<>();
-    private GBDevice selectedDevice = null;
+    private List<GBDevice> selectedDevices = new ArrayList<>();
 
     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
@@ -137,22 +137,13 @@ public class DeviceManager {
     }
 
     private void updateSelectedDevice(GBDevice dev) {
-        if (selectedDevice == null) {
+        selectedDevices.clear();
-            selectedDevice = dev;
+        for(GBDevice device : deviceList){
-        } else {
+            if(device.isInitialized()){
-            if (selectedDevice.equals(dev)) {
+                selectedDevices.add(device);
-                selectedDevice = dev; // equality vs identity!
-            } else {
-                if (selectedDevice.isConnected() && dev.isConnected()) {
-                    LOG.warn("multiple connected devices -- this is currently not really supported");
-                    selectedDevice = dev; // use the last one that changed
-                } else if (!selectedDevice.isConnected()) {
-                    selectedDevice = dev; // use the last one that changed
-                }
             }
         }
-        GB.updateNotification(selectedDevice, context);
+        GB.updateNotification(selectedDevices, context);
-
     }
 
     private void refreshPairedDevices() {
@@ -184,9 +175,8 @@ public class DeviceManager {
         return Collections.unmodifiableList(deviceList);
     }
 
-    @Nullable
+    public List<GBDevice> getSelectedDevices() {
-    public GBDevice getSelectedDevice() {
+        return selectedDevices;
-        return selectedDevice;
     }
 
     private void notifyDevicesChanged() {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/pebble/PebbleCoordinator.java

@@ -25,6 +25,7 @@ import androidx.annotation.NonNull;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.List;
 
 import de.greenrobot.dao.query.QueryBuilder;
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
@@ -168,18 +169,27 @@ public class PebbleCoordinator extends AbstractDeviceCoordinator {
 
     @Override
     public boolean supportsAppListFetching() {
-        GBDevice mGBDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (mGBDevice != null && mGBDevice.getFirmwareVersion() != null) {
+        for(GBDevice device : devices){
-            return PebbleUtils.getFwMajor(mGBDevice.getFirmwareVersion()) < 3;
+            if(device.getType() == DeviceType.PEBBLE){
+                if (device.getFirmwareVersion() != null) {
+                    return PebbleUtils.getFwMajor(device.getFirmwareVersion()) < 3;
+                }
+            }
         }
+
         return false;
     }
 
     @Override
     public boolean supportsAppReordering() {
-        GBDevice mGBDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (mGBDevice != null && mGBDevice.getFirmwareVersion() != null) {
+        for(GBDevice device : devices){
-            return PebbleUtils.getFwMajor(mGBDevice.getFirmwareVersion()) >= 3;
+            if(device.getType() == DeviceType.PEBBLE){
+                if (device.getFirmwareVersion() != null) {
+                    return PebbleUtils.getFwMajor(device.getFirmwareVersion()) >= 3;
+                }
+            }
         }
         return false;
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qc35/QC35Coordinator.java

@@ -25,7 +25,7 @@ import androidx.annotation.Nullable;
 
 import nodomain.freeyourgadget.gadgetbridge.GBException;
 import nodomain.freeyourgadget.gadgetbridge.R;
-import nodomain.freeyourgadget.gadgetbridge.devices.AbstractDeviceCoordinator;
+import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLClassicDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
 import nodomain.freeyourgadget.gadgetbridge.entities.DaoSession;
@@ -35,7 +35,7 @@ import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 
-public class QC35Coordinator extends AbstractDeviceCoordinator {
+public class QC35Coordinator extends AbstractBLClassicDeviceCoordinator {
     @Override
     protected void deleteDevice(@NonNull GBDevice gbDevice, @NonNull Device device, @NonNull DaoSession session) throws GBException {
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/AppsManagementActivity.java

@@ -54,25 +54,34 @@ public class AppsManagementActivity extends AbstractGBActivity {
 
     private void refreshInstalledApps() {
         try {
-            GBDevice selected = GBApplication.app().getDeviceManager().getSelectedDevice();
+            List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-            if (selected.getType() != DeviceType.FOSSILQHYBRID || !selected.isConnected() || !selected.getModel().startsWith("DN") || selected.getState() != GBDevice.State.INITIALIZED) {
+            boolean deviceFound = false;
-                throw new RuntimeException("Device not connected");
+            for(GBDevice device : devices){
+                if (
+                        device.getType() == DeviceType.FOSSILQHYBRID &&
+                                device.isConnected() &&
+                                device.getModel().startsWith("DN") &&
+                                device.getState() == GBDevice.State.INITIALIZED
+                ) {
+                    String installedAppsJson = device.getDeviceInfo("INSTALLED_APPS").getDetails();
+                    if (installedAppsJson == null || installedAppsJson.isEmpty()) {
+                        throw new RuntimeException("can't get installed apps");
+                    }
+                    JSONArray apps = new JSONArray(installedAppsJson);
+                    appNames = new String[apps.length()];
+                    for (int i = 0; i < apps.length(); i++) {
+                        appNames[i] = apps.getString(i);
+                    }
+                    appsListView.setAdapter(new AppsListAdapter(this, appNames));
+                }
+                return;
             }
-            String installedAppsJson = selected.getDeviceInfo("INSTALLED_APPS").getDetails();
+        } catch (JSONException e) {
-            if (installedAppsJson == null || installedAppsJson.isEmpty()) {
-                throw new RuntimeException("cant get installed apps");
-            }
-            JSONArray apps = new JSONArray(installedAppsJson);
-            appNames = new String[apps.length()];
-            for (int i = 0; i < apps.length(); i++) {
-                appNames[i] = apps.getString(i);
-            }
-            appsListView.setAdapter(new AppsListAdapter(this, appNames));
-        } catch (Exception e) {
             toast(e.getMessage());
             finish();
             return;
         }
+        throw new RuntimeException("Device not connected");
     }
 
     class AppsListAdapter extends ArrayAdapter<String> {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/CalibrationActivity.java

@@ -29,6 +29,8 @@ import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 
+import java.util.List;
+
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.AbstractGBActivity;
@@ -85,9 +87,16 @@ public class CalibrationActivity extends AbstractGBActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_qhybrid_calibration);
 
-        GBDevice device = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
+        boolean atLeastOneConnected = false;
+        for(GBDevice device : devices){
+            if(device.getType() == DeviceType.FOSSILQHYBRID){
+                atLeastOneConnected = true;
+                break;
+            }
+        }
 
-        if(device == null || device.getType() != DeviceType.FOSSILQHYBRID){
+        if(!atLeastOneConnected){
             Toast.makeText(this, R.string.watch_not_connected, Toast.LENGTH_LONG).show();
             finish();
             return;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/ConfigActivity.java

@@ -303,12 +303,14 @@ public class ConfigActivity extends AbstractGBActivity {
             }
         });
 
-        device = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (device == null || device.getType() != DeviceType.FOSSILQHYBRID || device.getFirmwareVersion().charAt(2) != '0') {
+        for(GBDevice device : devices){
-            setSettingsError(getString(R.string.watch_not_connected));
+            if (device.getType() == DeviceType.FOSSILQHYBRID && device.getFirmwareVersion().charAt(2) == '0') {
-        } else {
+                updateSettings();
-            updateSettings();
+                return;
+            }
         }
+        setSettingsError(getString(R.string.watch_not_connected));
     }
 
     private void updateTimeOffset() {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/HRConfigActivity.java

@@ -46,6 +46,8 @@ import java.util.List;
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.AbstractGBActivity;
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
+import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.QHybridSupport;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.requests.fossil_hr.widget.CustomBackgroundWidgetElement;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.qhybrid.requests.fossil_hr.widget.CustomTextWidgetElement;
@@ -168,19 +170,25 @@ public class HRConfigActivity extends AbstractGBActivity {
         }
 
         // Disable some functions on watches with too new firmware (from official app 4.6.0 and higher)
-        String fwVersion_str = GBApplication.app().getDeviceManager().getSelectedDevice().getFirmwareVersion();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        fwVersion_str = fwVersion_str.replaceFirst("^DN", "").replaceFirst("r\\.v.*", "");
+        for(GBDevice device : devices){
-        Version fwVersion = new Version(fwVersion_str);
+            if(device.getType() == DeviceType.FOSSILQHYBRID){
-        if (fwVersion.compareTo(new Version("1.0.2.20")) >= 0) {
+                String fwVersion_str = device.getFirmwareVersion();
-            findViewById(R.id.qhybrid_widget_add).setEnabled(false);
+                fwVersion_str = fwVersion_str.replaceFirst("^DN", "").replaceFirst("r\\.v.*", "");
-            for (int i = 0; i < widgetButtonsMapping.size(); i++) {
+                Version fwVersion = new Version(fwVersion_str);
-                final int widgetButtonId = widgetButtonsMapping.keyAt(i);
+                if (fwVersion.compareTo(new Version("1.0.2.20")) >= 0) {
-                findViewById(widgetButtonId).setEnabled(false);
+                    findViewById(R.id.qhybrid_widget_add).setEnabled(false);
+                    for (int i = 0; i < widgetButtonsMapping.size(); i++) {
+                        final int widgetButtonId = widgetButtonsMapping.keyAt(i);
+                        findViewById(widgetButtonId).setEnabled(false);
+                    }
+                    findViewById(R.id.qhybrid_set_background).setEnabled(false);
+                    findViewById(R.id.qhybrid_unset_background).setEnabled(false);
+                    GB.toast(getString(R.string.fossil_hr_warning_firmware_too_new), Toast.LENGTH_LONG, GB.INFO);
+                }
             }
-            findViewById(R.id.qhybrid_set_background).setEnabled(false);
-            findViewById(R.id.qhybrid_unset_background).setEnabled(false);
-            GB.toast(getString(R.string.fossil_hr_warning_firmware_too_new), Toast.LENGTH_LONG, GB.INFO);
         }
+
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/qhybrid/QHybridCoordinator.java

@@ -35,6 +35,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -42,6 +43,7 @@ import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.GBException;
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.appmanager.AppManagerActivity;
+import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLEDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.AbstractDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
@@ -54,7 +56,7 @@ import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 import nodomain.freeyourgadget.gadgetbridge.util.FileUtils;
 import nodomain.freeyourgadget.gadgetbridge.util.Version;
 
-public class QHybridCoordinator extends AbstractDeviceCoordinator {
+public class QHybridCoordinator extends AbstractBLEDeviceCoordinator {
     private static final Logger LOG = LoggerFactory.getLogger(QHybridCoordinator.class);
 
     @NonNull
@@ -89,8 +91,13 @@ public class QHybridCoordinator extends AbstractDeviceCoordinator {
 
     @Override
     public boolean supportsActivityDataFetching() {
-        GBDevice connectedDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        return connectedDevice != null && connectedDevice.getType() == DeviceType.FOSSILQHYBRID && connectedDevice.getState() == GBDevice.State.INITIALIZED;
+        for(GBDevice device : devices){
+            if(isFossilHybrid(device) && device.getState() == GBDevice.State.INITIALIZED){
+                return true;
+            }
+        }
+        return false;
     }
 
     @Override
@@ -129,11 +136,14 @@ public class QHybridCoordinator extends AbstractDeviceCoordinator {
     }
 
     private boolean supportsAlarmConfiguration() {
-        GBDevice connectedDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if(connectedDevice == null || connectedDevice.getType() != DeviceType.FOSSILQHYBRID || connectedDevice.getState() != GBDevice.State.INITIALIZED){
+        LOG.debug("devices count: " + devices.size());
-            return false;
+        for(GBDevice device : devices){
+            if(isFossilHybrid(device) && device.getState() == GBDevice.State.INITIALIZED){
+                return true;
+            }
         }
-        return true;
+        return false;
     }
 
     @Override
@@ -268,22 +278,34 @@ public class QHybridCoordinator extends AbstractDeviceCoordinator {
     }
 
     private boolean isHybridHR() {
-        GBDevice connectedDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (connectedDevice != null) {
+        for(GBDevice device : devices){
-            return connectedDevice.getName().startsWith("Hybrid HR");
+            if(isFossilHybrid(device) && device.getName().startsWith("Hybrid HR")){
+                return true;
+            }
         }
         return false;
     }
 
     private Version getFirmwareVersion() {
-        String firmware = GBApplication.app().getDeviceManager().getSelectedDevice().getFirmwareVersion();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (firmware != null) {
+        for(GBDevice device : devices){
-            Matcher matcher = Pattern.compile("[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+").matcher(firmware); // DN1.0.2.19r.v5
+            if(isFossilHybrid(device)){
-            if (matcher.find()) {
+                String firmware = device.getFirmwareVersion();
-                firmware = matcher.group(0);
+                if (firmware != null) {
-                return new Version(firmware);
+                    Matcher matcher = Pattern.compile("[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+").matcher(firmware); // DN1.0.2.19r.v5
+                    if (matcher.find()) {
+                        firmware = matcher.group(0);
+                        return new Version(firmware);
+                    }
+                }
             }
         }
+
         return null;
     }
+
+    private boolean isFossilHybrid(GBDevice device){
+        return device.getType() == DeviceType.FOSSILQHYBRID;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/um25/Coordinator/UM25Coordinator.java

@@ -14,6 +14,7 @@ import java.util.Collections;
 
 import nodomain.freeyourgadget.gadgetbridge.GBException;
 import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLEDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.AbstractDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
@@ -26,7 +27,7 @@ import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.um25.Support.UM25Support;
 
-public class UM25Coordinator extends AbstractDeviceCoordinator {
+public class UM25Coordinator extends AbstractBLEDeviceCoordinator {
     @Override
     protected void deleteDevice(@NonNull GBDevice gbDevice, @NonNull Device device, @NonNull DaoSession session) throws GBException {
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/vesc/VescCoordinator.java

@@ -26,6 +26,7 @@ import org.slf4j.LoggerFactory;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.GBException;
+import nodomain.freeyourgadget.gadgetbridge.devices.AbstractBLEDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.AbstractDeviceCoordinator;
 import nodomain.freeyourgadget.gadgetbridge.devices.InstallHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
@@ -36,7 +37,7 @@ import nodomain.freeyourgadget.gadgetbridge.impl.GBDeviceCandidate;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceType;
 
-public class VescCoordinator extends AbstractDeviceCoordinator {
+public class VescCoordinator extends AbstractBLEDeviceCoordinator {
     public final static String UUID_SERVICE_SERIAL_HM10 = "0000ffe0-0000-1000-8000-00805f9b34fb";
     public final static String UUID_CHARACTERISTIC_SERIAL_TX_HM10 = "0000ffe1-0000-1000-8000-00805f9b34fb";
     public final static String UUID_CHARACTERISTIC_SERIAL_RX_HM10 = "0000ffe1-0000-1000-8000-00805f9b34fb";

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/BluetoothConnectReceiver.java

@@ -20,13 +20,17 @@ import android.bluetooth.BluetoothDevice;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.List;
+
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.service.DeviceCommunicationService;
+import nodomain.freeyourgadget.gadgetbridge.util.GBPrefs;
 
 public class BluetoothConnectReceiver extends BroadcastReceiver {
 
@@ -46,14 +50,30 @@ public class BluetoothConnectReceiver extends BroadcastReceiver {
         }
 
         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
-        LOG.info("connection attempt detected from or to " + device.getAddress() + "(" + device.getName() + ")");
+        LOG.info("connection attempt detected from " + device.getAddress() + "(" + device.getName() + ")");
 
-        GBDevice gbDevice = service.getGBDevice();
+        GBDevice gbDevice = getKnownDeviceByAddressOrNull(device.getAddress());
-        if (gbDevice != null) {
+        if(gbDevice == null){
-            if (device.getAddress().equals(gbDevice.getAddress()) && gbDevice.getState() == GBDevice.State.WAITING_FOR_RECONNECT) {
+            LOG.info("connected device {} unknown", device.getAddress());
-                LOG.info("Will re-connect to " + gbDevice.getAddress() + "(" + gbDevice.getName() + ")");
+            return;
-                GBApplication.deviceService().connect();
+        }
+        SharedPreferences deviceSpecificPreferences = GBApplication.getDeviceSpecificSharedPrefs(gbDevice.getAddress());
+        boolean reactToConnection = deviceSpecificPreferences.getBoolean(GBPrefs.DEVICE_CONNECT_BACK, false);
+        reactToConnection |= gbDevice.getState() == GBDevice.State.WAITING_FOR_RECONNECT;
+        if(!reactToConnection){
+            return;
+        }
+        LOG.info("Will re-connect to " + gbDevice.getAddress() + "(" + gbDevice.getName() + ")");
+        GBApplication.deviceService().connect(gbDevice);
+    }
+
+    private GBDevice getKnownDeviceByAddressOrNull(String deviceAddress){
+        List<GBDevice> knownDevices = GBApplication.app().getDeviceManager().getDevices();
+        for(GBDevice device : knownDevices){
+            if(device.getAddress().equals(deviceAddress)){
+                return device;
             }
         }
+        return null;
     }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/BluetoothPairingRequestReceiver.java

@@ -47,21 +47,26 @@ public class BluetoothPairingRequestReceiver extends BroadcastReceiver {
         if (!action.equals(BluetoothDevice.ACTION_PAIRING_REQUEST)) {
             return;
         }
-
-        GBDevice gbDevice = service.getGBDevice();
         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
-        if (gbDevice == null || device == null) {
+        if (device == null) {
             return;
         }
 
-        DeviceCoordinator coordinator = DeviceHelper.getInstance().getCoordinator(gbDevice);
+        GBDevice gbDevice = null;
         try {
-            if (coordinator.getBondingStyle() == DeviceCoordinator.BONDING_STYLE_NONE) {
+            gbDevice = service.getDeviceByAddress(device.getAddress());
-                LOG.info("Aborting unwanted pairing request");
+
-                abortBroadcast();
+            DeviceCoordinator coordinator = DeviceHelper.getInstance().getCoordinator(gbDevice);
+            try {
+                if (coordinator.getBondingStyle() == DeviceCoordinator.BONDING_STYLE_NONE) {
+                    LOG.info("Aborting unwanted pairing request");
+                    abortBroadcast();
+                }
+            } catch (Exception e) {
+                LOG.warn("Could not abort pairing request process");
             }
-        } catch (Exception e) {
+        } catch (DeviceCommunicationService.DeviceNotFoundException e) {
-            LOG.warn("Could not abort pairing request process");
+            e.printStackTrace();
         }
     }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/externalevents/NotificationListener.java

@@ -767,9 +767,9 @@ public class NotificationListener extends NotificationListenerService {
         notificationsActive.removeAll(notificationsToRemove);
 
         // Send notification remove request to device
-        GBDevice connectedDevice = GBApplication.app().getDeviceManager().getSelectedDevice();
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        if (connectedDevice != null) {
+        for(GBDevice device : devices){
-            Prefs prefs = new  Prefs(GBApplication.getDeviceSpecificSharedPrefs(connectedDevice.getAddress()));
+            Prefs prefs = new  Prefs(GBApplication.getDeviceSpecificSharedPrefs(device.getAddress()));
             if (prefs.getBoolean("autoremove_notifications", true)) {
                 for (int id : notificationsToRemove) {
                     LOG.info("Notification " + id + " removed, will ask device to delete it");

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/impl/GBDeviceService.java

@@ -118,6 +118,13 @@ public class GBDeviceService implements DeviceService {
         invokeService(intent);
     }
 
+    @Override
+    public void disconnect(@Nullable GBDevice device) {
+        Intent intent = createIntent().setAction(ACTION_DISCONNECT)
+                .putExtra(GBDevice.EXTRA_DEVICE, device);
+        invokeService(intent);
+    }
+
     @Override
     public void disconnect() {
         Intent intent = createIntent().setAction(ACTION_DISCONNECT);

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

@@ -154,6 +154,8 @@ public interface DeviceService extends EventHandler {
 
     void connect(@Nullable GBDevice device, boolean firstTime);
 
+    void disconnect(@Nullable GBDevice device);
+
     void disconnect();
 
     void quit();

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java

@@ -44,9 +44,11 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.UUID;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
+import nodomain.freeyourgadget.gadgetbridge.GBException;
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.HeartRateUtils;
 import nodomain.freeyourgadget.gadgetbridge.devices.DeviceCoordinator;
@@ -189,6 +191,108 @@ import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.EXTRA_WEA
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.EXTRA_WORLD_CLOCKS;
 
 public class DeviceCommunicationService extends Service implements SharedPreferences.OnSharedPreferenceChangeListener {
+    public static class DeviceStruct{
+        private GBDevice device;
+        private DeviceCoordinator coordinator;
+        private DeviceSupport deviceSupport;
+
+        public GBDevice getDevice() {
+            return device;
+        }
+
+        public void setDevice(GBDevice device) {
+            this.device = device;
+        }
+
+        public DeviceCoordinator getCoordinator() {
+            return coordinator;
+        }
+
+        public void setCoordinator(DeviceCoordinator coordinator) {
+            this.coordinator = coordinator;
+        }
+
+        public DeviceSupport getDeviceSupport() {
+            return deviceSupport;
+        }
+
+        public void setDeviceSupport(DeviceSupport deviceSupport) {
+            this.deviceSupport = deviceSupport;
+        }
+    }
+
+    private class FeatureSet{
+        private boolean supportsWeather = false;
+        private boolean supportsActivityDataFetching = false;
+        private boolean supportsCalendarEvents = false;
+        private boolean supportsMusicInfo = false;
+
+        public boolean supportsWeather() {
+            return supportsWeather;
+        }
+
+        public void setSupportsWeather(boolean supportsWeather) {
+            this.supportsWeather = supportsWeather;
+        }
+
+        public boolean supportsActivityDataFetching() {
+            return supportsActivityDataFetching;
+        }
+
+        public void setSupportsActivityDataFetching(boolean supportsActivityDataFetching) {
+            this.supportsActivityDataFetching = supportsActivityDataFetching;
+        }
+
+        public boolean supportsCalendarEvents() {
+            return supportsCalendarEvents;
+        }
+
+        public void setSupportsCalendarEvents(boolean supportsCalendarEvents) {
+            this.supportsCalendarEvents = supportsCalendarEvents;
+        }
+
+        public boolean supportsMusicInfo() {
+            return supportsMusicInfo;
+        }
+
+        public void setSupportsMusicInfo(boolean supportsMusicInfo) {
+            this.supportsMusicInfo = supportsMusicInfo;
+        }
+
+        public void logicalOr(DeviceCoordinator operand){
+            if(operand.supportsCalendarEvents()){
+                setSupportsCalendarEvents(true);
+            }
+            if(operand.supportsWeather()){
+                setSupportsWeather(true);
+            }
+            if(operand.supportsActivityDataFetching()){
+                setSupportsActivityDataFetching(true);
+            }
+            if(operand.supportsMusicInfo()){
+                setSupportsMusicInfo(true);
+            }
+        }
+    }
+
+    public static class DeviceNotFoundException extends GBException{
+        private final String address;
+
+        public DeviceNotFoundException(GBDevice device) {
+            this.address = device.getAddress();
+        }
+
+        public DeviceNotFoundException(String address) {
+            this.address = address;
+        }
+
+        @Nullable
+        @Override
+        public String getMessage() {
+            return String.format("device %s not found cached", address);
+        }
+    }
+
     private static final Logger LOG = LoggerFactory.getLogger(DeviceCommunicationService.class);
     @SuppressLint("StaticFieldLeak") // only used for test cases
     private static DeviceSupportFactory DEVICE_SUPPORT_FACTORY = null;
@@ -196,9 +300,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
     private boolean mStarted = false;
 
     private DeviceSupportFactory mFactory;
-    private GBDevice mGBDevice = null;
+    private final ArrayList<DeviceStruct> deviceStructs = new ArrayList<>(1);
-    private DeviceSupport mDeviceSupport;
-    private DeviceCoordinator mCoordinator = null;
 
     private PhoneCallReceiver mPhoneCallReceiver = null;
     private SMSReceiver mSMSReceiver = null;
@@ -236,6 +338,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
      *
      * @param factory
      */
+    @SuppressWarnings("JavaDoc")
     public static void setDeviceSupportFactory(DeviceSupportFactory factory) {
         DEVICE_SUPPORT_FACTORY = factory;
     }
@@ -248,20 +351,45 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
-            if (GBDevice.ACTION_DEVICE_CHANGED.equals(action)) {
+            if(GBDevice.ACTION_DEVICE_CHANGED.equals(action)){
                 GBDevice device = intent.getParcelableExtra(GBDevice.EXTRA_DEVICE);
-                if (mGBDevice != null && mGBDevice.equals(device)) {
+
-                    mGBDevice = device;
+                // create a new instance of the changed devices coordinator, in case it's capabilities changed
-                    mCoordinator = DeviceHelper.getInstance().getCoordinator(device);
+                DeviceStruct cachedStruct = getDeviceStructOrNull(device);
-                    boolean enableReceivers = mDeviceSupport != null && (mDeviceSupport.useAutoConnect() || mGBDevice.isInitialized());
+                if(cachedStruct != null) {
-                    setReceiversEnableState(enableReceivers, mGBDevice.isInitialized(), mCoordinator);
+                    cachedStruct.setDevice(device);
-                } else {
+                    DeviceCoordinator newCoordinator = DeviceHelper.getInstance().getCoordinator(device);
-                    LOG.error("Got ACTION_DEVICE_CHANGED from unexpected device: " + device);
+                    cachedStruct.setCoordinator(newCoordinator);
                 }
+                updateReceiversState();
             }
         }
     };
 
+    private void updateReceiversState(){
+        boolean enableReceivers = false;
+        boolean anyDeviceInitialized = false;
+
+        FeatureSet features = new FeatureSet();
+
+        for(DeviceStruct struct: deviceStructs){
+            DeviceSupport deviceSupport = struct.getDeviceSupport();
+            if((deviceSupport != null && deviceSupport.useAutoConnect()) || isDeviceInitialized(struct.getDevice())){
+                enableReceivers = true;
+            }
+            if(isDeviceInitialized(struct.getDevice())){
+                anyDeviceInitialized = true;
+            }
+
+            DeviceCoordinator coordinator = struct.getCoordinator();
+            if(coordinator != null){
+                features.logicalOr(coordinator);
+            }
+        }
+
+        setReceiversEnableState(enableReceivers, anyDeviceInitialized, features);
+    }
+
     @Override
     public void onCreate() {
         LOG.debug("DeviceCommunicationService is being created");
@@ -269,6 +397,9 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
         LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver, new IntentFilter(GBDevice.ACTION_DEVICE_CHANGED));
         mFactory = getDeviceSupportFactory();
 
+        mBlueToothConnectReceiver = new BluetoothConnectReceiver(this);
+        registerReceiver(mBlueToothConnectReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
+
         if (hasPrefs()) {
             getPrefs().getPreferences().registerOnSharedPreferenceChangeListener(this);
         }
@@ -306,14 +437,15 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 return START_NOT_STICKY;
             }
 
-            if (mDeviceSupport == null || (!isInitialized() && !action.equals(ACTION_DISCONNECT) && (!mDeviceSupport.useAutoConnect() || isConnected()))) {
+            // TODO
+            /*if (mDeviceSupport == null || (!isInitialized() && !action.equals(ACTION_DISCONNECT) && (!mDeviceSupport.useAutoConnect() || isConnected()))) {
                 // trying to send notification without valid Bluetooth connection
                 if (mGBDevice != null) {
                     // at least send back the current device state
                     mGBDevice.sendDeviceUpdateIntent(this);
                 }
                 return START_STICKY;
-            }
+            }*/
         }
 
         // when we get past this, we should have valid mDeviceSupport and mGBDevice instances
@@ -338,41 +470,73 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                     btDeviceAddress = gbDevice.getAddress();
                 }
 
+                if(gbDevice == null){
+                    return START_NOT_STICKY;
+                }
+
                 boolean autoReconnect = GBPrefs.AUTO_RECONNECT_DEFAULT;
                 if (prefs != null && prefs.getPreferences() != null) {
                     prefs.getPreferences().edit().putString("last_device_address", btDeviceAddress).apply();
-                    autoReconnect = getGBPrefs().getAutoReconnect();
+                    autoReconnect = getGBPrefs().getAutoReconnect(gbDevice);
                 }
 
-                if (gbDevice != null && !isConnecting() && !isConnected()) {
+                DeviceStruct registeredStruct = getDeviceStructOrNull(gbDevice);
-                    setDeviceSupport(null);
+                if(registeredStruct != null){
-                    try {
+                    boolean deviceAlreadyConnected = isDeviceConnecting(registeredStruct.getDevice()) || isDeviceConnected(registeredStruct.getDevice());
-                        DeviceSupport deviceSupport = mFactory.createDeviceSupport(gbDevice);
+                    if(deviceAlreadyConnected){
-                        if (deviceSupport != null) {
+                        break;
-                            setDeviceSupport(deviceSupport);
-                            if (firstTime) {
-                                deviceSupport.connectFirstTime();
-                            } else {
-                                deviceSupport.setAutoReconnect(autoReconnect);
-                                deviceSupport.connect();
-                            }
-                        } else {
-                            GB.toast(this, getString(R.string.cannot_connect, "Can't create device support"), Toast.LENGTH_SHORT, GB.ERROR);
-                        }
-                    } catch (Exception e) {
-                        GB.toast(this, getString(R.string.cannot_connect, e.getMessage()), Toast.LENGTH_SHORT, GB.ERROR, e);
-                        setDeviceSupport(null);
                     }
-                } else if (mGBDevice != null) {
+                    try {
-                    // send an update at least
+                        removeDeviceSupport(gbDevice);
-                    mGBDevice.sendDeviceUpdateIntent(this);
+                    } catch (DeviceNotFoundException e) {
+                        e.printStackTrace();
+                    }
+                }else{
+                    registeredStruct = new DeviceStruct();
+                    registeredStruct.setDevice(gbDevice);
+                    registeredStruct.setCoordinator(DeviceHelper.getInstance().getCoordinator(gbDevice));
+                    deviceStructs.add(registeredStruct);
+                }
+
+                try {
+                    DeviceSupport deviceSupport = mFactory.createDeviceSupport(gbDevice);
+                    if (deviceSupport != null) {
+                        setDeviceSupport(gbDevice, deviceSupport);
+                        if (firstTime) {
+                            deviceSupport.connectFirstTime();
+                        } else {
+                            deviceSupport.setAutoReconnect(autoReconnect);
+                            deviceSupport.connect();
+                        }
+                    } else {
+                        GB.toast(this, getString(R.string.cannot_connect, "Can't create device support"), Toast.LENGTH_SHORT, GB.ERROR);
+                    }
+                } catch (Exception e) {
+                    GB.toast(this, getString(R.string.cannot_connect, e.getMessage()), Toast.LENGTH_SHORT, GB.ERROR, e);
+                }
+
+                for(DeviceStruct struct2 : deviceStructs){
+                    struct2.getDevice().sendDeviceUpdateIntent(this);
                 }
                 break;
             default:
-                if (mDeviceSupport == null || mGBDevice == null) {
+                GBDevice targetedDevice = intent.getParcelableExtra(GBDevice.EXTRA_DEVICE);
-                    LOG.warn("device support:" + mDeviceSupport + ", device: " + mGBDevice + ", aborting");
+                ArrayList<GBDevice> targetedDevices = new ArrayList<>();
-                } else {
+                if(targetedDevice != null){
-                    handleAction(intent, action, prefs);
+                    targetedDevices.add(targetedDevice);
+                }else{
+                    for(GBDevice device : getGBDevices()){
+                        if(isDeviceInitialized(device)){
+                            targetedDevices.add(device);
+                        }
+                    }
+                }
+                for (GBDevice device1 : targetedDevices) {
+                    try {
+                        handleAction(intent, action, device1);
+                    } catch (DeviceNotFoundException e) {
+                        e.printStackTrace();
+                    }
                 }
                 break;
         }
@@ -383,21 +547,35 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
      * @param text original text
      * @return 'text' or a new String without non supported chars like emoticons, etc.
      */
-    private String sanitizeNotifText(String text) {
+    private String sanitizeNotifText(String text, GBDevice device) throws DeviceNotFoundException {
         if (text == null || text.length() == 0)
             return text;
 
-        text = mDeviceSupport.customStringFilter(text);
+        text = getDeviceSupport(device).customStringFilter(text);
 
-        if (!mCoordinator.supportsUnicodeEmojis()) {
+        if (!getDeviceCoordinator(device).supportsUnicodeEmojis()) {
             return EmojiConverter.convertUnicodeEmojiToAscii(text, getApplicationContext());
         }
 
         return text;
     }
 
-    private void handleAction(Intent intent, String action, Prefs prefs) {
+    private DeviceCoordinator getDeviceCoordinator(GBDevice device) throws DeviceNotFoundException {
-        Prefs devicePrefs = new Prefs(GBApplication.getDeviceSpecificSharedPrefs(mGBDevice.getAddress()));
+        if(device == null){
+            throw new DeviceNotFoundException("null");
+        }
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device)){
+                return struct.getCoordinator();
+            }
+        }
+        throw new DeviceNotFoundException(device);
+    }
+
+    private void handleAction(Intent intent, String action, GBDevice device) throws DeviceNotFoundException {
+        DeviceSupport deviceSupport = getDeviceSupport(device);
+
+        Prefs devicePrefs = new Prefs(GBApplication.getDeviceSpecificSharedPrefs(device.getAddress()));
         boolean transliterate = devicePrefs.getBoolean(PREF_TRANSLITERATION_ENABLED, false);
 
         if (transliterate) {
@@ -410,16 +588,16 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
 
         switch (action) {
             case ACTION_REQUEST_DEVICEINFO:
-                mGBDevice.sendDeviceUpdateIntent(this);
+                device.sendDeviceUpdateIntent(this);
                 break;
             case ACTION_NOTIFICATION: {
                 int desiredId = intent.getIntExtra(EXTRA_NOTIFICATION_ID, -1);
                 NotificationSpec notificationSpec = new NotificationSpec(desiredId);
                 notificationSpec.phoneNumber = intent.getStringExtra(EXTRA_NOTIFICATION_PHONENUMBER);
-                notificationSpec.sender = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_SENDER));
+                notificationSpec.sender = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_SENDER), device);
-                notificationSpec.subject = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_SUBJECT));
+                notificationSpec.subject = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_SUBJECT), device);
-                notificationSpec.title = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_TITLE));
+                notificationSpec.title = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_TITLE), device);
-                notificationSpec.body = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_BODY));
+                notificationSpec.body = sanitizeNotifText(intent.getStringExtra(EXTRA_NOTIFICATION_BODY), device);
                 notificationSpec.sourceName = intent.getStringExtra(EXTRA_NOTIFICATION_SOURCENAME);
                 notificationSpec.type = (NotificationType) intent.getSerializableExtra(EXTRA_NOTIFICATION_TYPE);
                 notificationSpec.attachedActions = (ArrayList<NotificationSpec.Action>) intent.getSerializableExtra(EXTRA_NOTIFICATION_ACTIONS);
@@ -449,11 +627,11 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                     notificationSpec.cannedReplies = replies.toArray(new String[0]);
                 }
 
-                mDeviceSupport.onNotification(notificationSpec);
+                deviceSupport.onNotification(notificationSpec);
                 break;
             }
             case ACTION_DELETE_NOTIFICATION: {
-                mDeviceSupport.onDeleteNotification(intent.getIntExtra(EXTRA_NOTIFICATION_ID, -1));
+                deviceSupport.onDeleteNotification(intent.getIntExtra(EXTRA_NOTIFICATION_ID, -1));
                 break;
             }
             case ACTION_ADD_CALENDAREVENT: {
@@ -462,61 +640,62 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 calendarEventSpec.type = intent.getByteExtra(EXTRA_CALENDAREVENT_TYPE, (byte) -1);
                 calendarEventSpec.timestamp = intent.getIntExtra(EXTRA_CALENDAREVENT_TIMESTAMP, -1);
                 calendarEventSpec.durationInSeconds = intent.getIntExtra(EXTRA_CALENDAREVENT_DURATION, -1);
-                calendarEventSpec.title = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_TITLE));
+                calendarEventSpec.title = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_TITLE), device);
-                calendarEventSpec.description = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_DESCRIPTION));
+                calendarEventSpec.description = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_DESCRIPTION), device);
-                calendarEventSpec.location = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_LOCATION));
+                calendarEventSpec.location = sanitizeNotifText(intent.getStringExtra(EXTRA_CALENDAREVENT_LOCATION), device);
-                mDeviceSupport.onAddCalendarEvent(calendarEventSpec);
+                deviceSupport.onAddCalendarEvent(calendarEventSpec);
                 break;
             }
             case ACTION_DELETE_CALENDAREVENT: {
                 long id = intent.getLongExtra(EXTRA_CALENDAREVENT_ID, -1);
                 byte type = intent.getByteExtra(EXTRA_CALENDAREVENT_TYPE, (byte) -1);
-                mDeviceSupport.onDeleteCalendarEvent(type, id);
+                deviceSupport.onDeleteCalendarEvent(type, id);
                 break;
             }
             case ACTION_RESET: {
                 int flags = intent.getIntExtra(EXTRA_RESET_FLAGS, 0);
-                mDeviceSupport.onReset(flags);
+                deviceSupport.onReset(flags);
                 break;
             }
             case ACTION_HEARTRATE_TEST: {
-                mDeviceSupport.onHeartRateTest();
+                deviceSupport.onHeartRateTest();
                 break;
             }
             case ACTION_FETCH_RECORDED_DATA: {
-                int dataTypes = intent.getIntExtra(EXTRA_RECORDED_DATA_TYPES, 0);
+                if(!getDeviceCoordinator(device).supportsActivityDataFetching()){
-                mDeviceSupport.onFetchRecordedData(dataTypes);
+                    break;
-                break;
-            }
-            case ACTION_DISCONNECT: {
-                mDeviceSupport.dispose();
-                if (mGBDevice != null) {
-                    mGBDevice.setState(GBDevice.State.NOT_CONNECTED);
-                    mGBDevice.sendDeviceUpdateIntent(this);
                 }
-                setReceiversEnableState(false, false, null);
+                int dataTypes = intent.getIntExtra(EXTRA_RECORDED_DATA_TYPES, 0);
-                mGBDevice = null;
+                deviceSupport.onFetchRecordedData(dataTypes);
-                mDeviceSupport = null;
-                mCoordinator = null;
                 break;
             }
+            case ACTION_DISCONNECT:
+                try {
+                    removeDeviceSupport(device);
+                } catch (DeviceNotFoundException e) {
+                    e.printStackTrace();
+                }
+                device.setState(GBDevice.State.NOT_CONNECTED);
+                device.sendDeviceUpdateIntent(this);
+                updateReceiversState();
+                break;
             case ACTION_FIND_DEVICE: {
                 boolean start = intent.getBooleanExtra(EXTRA_FIND_START, false);
-                mDeviceSupport.onFindDevice(start);
+                deviceSupport.onFindDevice(start);
                 break;
             }
             case ACTION_SET_CONSTANT_VIBRATION: {
                 int intensity = intent.getIntExtra(EXTRA_VIBRATION_INTENSITY, 0);
-                mDeviceSupport.onSetConstantVibration(intensity);
+                deviceSupport.onSetConstantVibration(intensity);
                 break;
             }
             case ACTION_CALLSTATE:
                 CallSpec callSpec = new CallSpec();
                 callSpec.command = intent.getIntExtra(EXTRA_CALL_COMMAND, CallSpec.CALL_UNDEFINED);
                 callSpec.number = intent.getStringExtra(EXTRA_CALL_PHONENUMBER);
-                callSpec.name = sanitizeNotifText(intent.getStringExtra(EXTRA_CALL_DISPLAYNAME));
+                callSpec.name = sanitizeNotifText(intent.getStringExtra(EXTRA_CALL_DISPLAYNAME), device);
                 callSpec.dndSuppressed = intent.getIntExtra(EXTRA_CALL_DNDSUPPRESSED, 0);
-                mDeviceSupport.onSetCallState(callSpec);
+                deviceSupport.onSetCallState(callSpec);
                 break;
             case ACTION_SETCANNEDMESSAGES:
                 int type = intent.getIntExtra(EXTRA_CANNEDMESSAGES_TYPE, -1);
@@ -525,24 +704,24 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 CannedMessagesSpec cannedMessagesSpec = new CannedMessagesSpec();
                 cannedMessagesSpec.type = type;
                 cannedMessagesSpec.cannedMessages = cannedMessages;
-                mDeviceSupport.onSetCannedMessages(cannedMessagesSpec);
+                deviceSupport.onSetCannedMessages(cannedMessagesSpec);
                 break;
             case ACTION_SETTIME:
-                mDeviceSupport.onSetTime();
+                deviceSupport.onSetTime();
                 break;
             case ACTION_SETMUSICINFO:
                 MusicSpec musicSpec = new MusicSpec();
-                musicSpec.artist = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_ARTIST));
+                musicSpec.artist = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_ARTIST), device);
-                musicSpec.album = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_ALBUM));
+                musicSpec.album = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_ALBUM), device);
-                musicSpec.track = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_TRACK));
+                musicSpec.track = sanitizeNotifText(intent.getStringExtra(EXTRA_MUSIC_TRACK), device);
                 musicSpec.duration = intent.getIntExtra(EXTRA_MUSIC_DURATION, 0);
                 musicSpec.trackCount = intent.getIntExtra(EXTRA_MUSIC_TRACKCOUNT, 0);
                 musicSpec.trackNr = intent.getIntExtra(EXTRA_MUSIC_TRACKNR, 0);
-                mDeviceSupport.onSetMusicInfo(musicSpec);
+                deviceSupport.onSetMusicInfo(musicSpec);
                 break;
             case ACTION_SET_PHONE_VOLUME:
                 float phoneVolume = intent.getFloatExtra(EXTRA_PHONE_VOLUME, 0);
-                mDeviceSupport.onSetPhoneVolume(phoneVolume);
+                deviceSupport.onSetPhoneVolume(phoneVolume);
                 break;
             case ACTION_SETMUSICSTATE:
                 MusicStateSpec stateSpec = new MusicStateSpec();
@@ -551,23 +730,23 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 stateSpec.position = intent.getIntExtra(EXTRA_MUSIC_POSITION, 0);
                 stateSpec.playRate = intent.getIntExtra(EXTRA_MUSIC_RATE, 0);
                 stateSpec.state = intent.getByteExtra(EXTRA_MUSIC_STATE, (byte) 0);
-                mDeviceSupport.onSetMusicState(stateSpec);
+                deviceSupport.onSetMusicState(stateSpec);
                 break;
             case ACTION_REQUEST_APPINFO:
-                mDeviceSupport.onAppInfoReq();
+                deviceSupport.onAppInfoReq();
                 break;
             case ACTION_REQUEST_SCREENSHOT:
-                mDeviceSupport.onScreenshotReq();
+                deviceSupport.onScreenshotReq();
                 break;
             case ACTION_STARTAPP: {
                 UUID uuid = (UUID) intent.getSerializableExtra(EXTRA_APP_UUID);
                 boolean start = intent.getBooleanExtra(EXTRA_APP_START, true);
-                mDeviceSupport.onAppStart(uuid, start);
+                deviceSupport.onAppStart(uuid, start);
                 break;
             }
             case ACTION_DELETEAPP: {
                 UUID uuid = (UUID) intent.getSerializableExtra(EXTRA_APP_UUID);
-                mDeviceSupport.onAppDelete(uuid);
+                deviceSupport.onAppDelete(uuid);
                 break;
             }
             case ACTION_APP_CONFIGURE: {
@@ -577,87 +756,87 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 if (intent.hasExtra(EXTRA_APP_CONFIG_ID)) {
                     id = intent.getIntExtra(EXTRA_APP_CONFIG_ID, 0);
                 }
-                mDeviceSupport.onAppConfiguration(uuid, config, id);
+                deviceSupport.onAppConfiguration(uuid, config, id);
                 break;
             }
             case ACTION_APP_REORDER: {
                 UUID[] uuids = (UUID[]) intent.getSerializableExtra(EXTRA_APP_UUID);
-                mDeviceSupport.onAppReorder(uuids);
+                deviceSupport.onAppReorder(uuids);
                 break;
             }
             case ACTION_INSTALL:
                 Uri uri = intent.getParcelableExtra(EXTRA_URI);
                 if (uri != null) {
                     LOG.info("will try to install app/fw");
-                    mDeviceSupport.onInstallApp(uri);
+                    deviceSupport.onInstallApp(uri);
                 }
                 break;
             case ACTION_SET_ALARMS:
                 ArrayList<? extends Alarm> alarms = (ArrayList<? extends Alarm>) intent.getSerializableExtra(EXTRA_ALARMS);
-                mDeviceSupport.onSetAlarms(alarms);
+                deviceSupport.onSetAlarms(alarms);
                 break;
             case ACTION_SET_REMINDERS:
                 ArrayList<? extends Reminder> reminders = (ArrayList<? extends Reminder>) intent.getSerializableExtra(EXTRA_REMINDERS);
-                mDeviceSupport.onSetReminders(reminders);
+                deviceSupport.onSetReminders(reminders);
                 break;
             case ACTION_SET_WORLD_CLOCKS:
                 ArrayList<? extends WorldClock> clocks = (ArrayList<? extends WorldClock>) intent.getSerializableExtra(EXTRA_WORLD_CLOCKS);
-                mDeviceSupport.onSetWorldClocks(clocks);
+                deviceSupport.onSetWorldClocks(clocks);
                 break;
             case ACTION_ENABLE_REALTIME_STEPS: {
                 boolean enable = intent.getBooleanExtra(EXTRA_BOOLEAN_ENABLE, false);
-                mDeviceSupport.onEnableRealtimeSteps(enable);
+                deviceSupport.onEnableRealtimeSteps(enable);
                 break;
             }
             case ACTION_ENABLE_HEARTRATE_SLEEP_SUPPORT: {
                 boolean enable = intent.getBooleanExtra(EXTRA_BOOLEAN_ENABLE, false);
-                mDeviceSupport.onEnableHeartRateSleepSupport(enable);
+                deviceSupport.onEnableHeartRateSleepSupport(enable);
                 break;
             }
             case ACTION_SET_HEARTRATE_MEASUREMENT_INTERVAL: {
                 int seconds = intent.getIntExtra(EXTRA_INTERVAL_SECONDS, 0);
-                mDeviceSupport.onSetHeartRateMeasurementInterval(seconds);
+                deviceSupport.onSetHeartRateMeasurementInterval(seconds);
                 break;
             }
             case ACTION_ENABLE_REALTIME_HEARTRATE_MEASUREMENT: {
                 boolean enable = intent.getBooleanExtra(EXTRA_BOOLEAN_ENABLE, false);
-                mDeviceSupport.onEnableRealtimeHeartRateMeasurement(enable);
+                deviceSupport.onEnableRealtimeHeartRateMeasurement(enable);
                 break;
             }
             case ACTION_SEND_CONFIGURATION: {
                 String config = intent.getStringExtra(EXTRA_CONFIG);
-                mDeviceSupport.onSendConfiguration(config);
+                deviceSupport.onSendConfiguration(config);
                 break;
             }
             case ACTION_READ_CONFIGURATION: {
                 String config = intent.getStringExtra(EXTRA_CONFIG);
-                mDeviceSupport.onReadConfiguration(config);
+                deviceSupport.onReadConfiguration(config);
                 break;
             }
             case ACTION_TEST_NEW_FUNCTION: {
-                mDeviceSupport.onTestNewFunction();
+                deviceSupport.onTestNewFunction();
                 break;
             }
             case ACTION_SEND_WEATHER: {
                 WeatherSpec weatherSpec = intent.getParcelableExtra(EXTRA_WEATHER);
                 if (weatherSpec != null) {
-                    mDeviceSupport.onSendWeather(weatherSpec);
+                    deviceSupport.onSendWeather(weatherSpec);
                 }
                 break;
             }
             case ACTION_SET_LED_COLOR:
                 int color = intent.getIntExtra(EXTRA_LED_COLOR, 0);
                 if (color != 0) {
-                    mDeviceSupport.onSetLedColor(color);
+                    deviceSupport.onSetLedColor(color);
                 }
                 break;
             case ACTION_POWER_OFF:
-                mDeviceSupport.onPowerOff();
+                deviceSupport.onPowerOff();
                 break;
             case ACTION_SET_FM_FREQUENCY:
                 float frequency = intent.getFloatExtra(EXTRA_FM_FREQUENCY, -1);
                 if (frequency != -1) {
-                    mDeviceSupport.onSetFmFrequency(frequency);
+                    deviceSupport.onSetFmFrequency(frequency);
                 }
                 break;
             case ACTION_SET_GPS_LOCATION:
@@ -671,18 +850,79 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
      * Disposes the current DeviceSupport instance (if any) and sets a new device support instance
      * (if not null).
      *
-     * @param deviceSupport
+     * @param deviceSupport deviceSupport to reokace/add
      */
-    private void setDeviceSupport(@Nullable DeviceSupport deviceSupport) {
+    private void setDeviceSupport(GBDevice device, DeviceSupport deviceSupport) throws DeviceNotFoundException {
-        if (deviceSupport != mDeviceSupport && mDeviceSupport != null) {
+       DeviceStruct deviceStruct = getDeviceStruct(device);
-            mDeviceSupport.dispose();
+       DeviceSupport cachedDeviceSupport = deviceStruct.getDeviceSupport();
-            mDeviceSupport = null;
+       if (deviceSupport != cachedDeviceSupport && cachedDeviceSupport != null) {
-            mGBDevice = null;
+           cachedDeviceSupport.dispose();
-            mCoordinator = null;
+       }
+       deviceStruct.setDeviceSupport(deviceSupport);
+    }
+
+    private void removeDeviceSupport(GBDevice device) throws DeviceNotFoundException {
+        DeviceStruct struct = getDeviceStruct(device);
+        if(struct.getDeviceSupport() != null){
+            struct.getDeviceSupport().dispose();
         }
-        mDeviceSupport = deviceSupport;
+        struct.setDeviceSupport(null);
-        mGBDevice = mDeviceSupport != null ? mDeviceSupport.getDevice() : null;
+    }
-        mCoordinator = mGBDevice != null ? DeviceHelper.getInstance().getCoordinator(mGBDevice) : null;
+
+    private DeviceStruct getDeviceStructOrNull(GBDevice device){
+        DeviceStruct deviceStruct = null;
+        try {
+            deviceStruct = getDeviceStruct(device);
+        } catch (DeviceNotFoundException e) {
+            e.printStackTrace();
+        }
+        return deviceStruct;
+    }
+
+    public DeviceStruct getDeviceStruct(GBDevice device) throws DeviceNotFoundException {
+        if(device == null){
+            throw new DeviceNotFoundException("null");
+        }
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device)){
+                return struct;
+            }
+        }
+        throw new DeviceNotFoundException(device);
+    }
+
+    public GBDevice getDeviceByAddress(String deviceAddress) throws DeviceNotFoundException {
+        if(deviceAddress == null){
+            throw new DeviceNotFoundException(deviceAddress);
+        }
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().getAddress().equals(deviceAddress)){
+                return struct.getDevice();
+            }
+        }
+        throw new DeviceNotFoundException(deviceAddress);
+    }
+
+    public GBDevice getDeviceByAddressOrNull(String deviceAddress){
+        GBDevice device = null;
+        try {
+            device = getDeviceByAddress(deviceAddress);
+        } catch (DeviceNotFoundException e) {
+            e.printStackTrace();
+        }
+        return device;
+    }
+
+    private DeviceSupport getDeviceSupport(GBDevice device) throws DeviceNotFoundException {
+        if(device == null){
+            throw new DeviceNotFoundException("null");
+        }
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device)){
+                return struct.getDeviceSupport();
+            }
+        }
+        throw new DeviceNotFoundException(device);
     }
 
     private void start() {
@@ -697,30 +937,49 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
         return mStarted;
     }
 
-    private boolean isConnected() {
+    private boolean isDeviceConnected(GBDevice device) {
-        return mGBDevice != null && mGBDevice.isConnected();
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device) ){
+                return struct.getDevice().isConnected();
+            }
+        }
+        return false;
     }
 
-    private boolean isConnecting() {
+    private boolean isDeviceConnecting(GBDevice device) {
-        return mGBDevice != null && mGBDevice.isConnecting();
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device) ){
+                return struct.getDevice().isConnecting();
+            }
+        }
+        return false;
     }
 
-    private boolean isInitialized() {
+    private boolean isDeviceInitialized(GBDevice device) {
-        return mGBDevice != null && mGBDevice.isInitialized();
+        for(DeviceStruct struct : deviceStructs){
+            if(struct.getDevice().equals(device) ){
+                return struct.getDevice().isInitialized();
+            }
+        }
+        return false;
     }
 
 
-    private void setReceiversEnableState(boolean enable, boolean initialized, DeviceCoordinator coordinator) {
+    private void setReceiversEnableState(boolean enable, boolean initialized, FeatureSet features) {
         LOG.info("Setting broadcast receivers to: " + enable);
 
-        if (enable && initialized && coordinator != null && coordinator.supportsCalendarEvents()) {
+        if(enable && features == null){
+            throw new RuntimeException("features cannot be null when enabling receivers");
+        }
+
+        if (enable && initialized && features.supportsCalendarEvents()) {
             if (mCalendarReceiver == null && getPrefs().getBoolean("enable_calendar_sync", true)) {
                 if (!(GBApplication.isRunningMarshmallowOrLater() && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) == PackageManager.PERMISSION_DENIED)) {
                     IntentFilter calendarIntentFilter = new IntentFilter();
                     calendarIntentFilter.addAction("android.intent.action.PROVIDER_CHANGED");
                     calendarIntentFilter.addDataScheme("content");
                     calendarIntentFilter.addDataAuthority("com.android.calendar", null);
-                    mCalendarReceiver = new CalendarReceiver(mGBDevice);
+                    mCalendarReceiver = new CalendarReceiver(null);
                     registerReceiver(mCalendarReceiver, calendarIntentFilter);
                 }
             }
@@ -756,7 +1015,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 mPebbleReceiver = new PebbleReceiver();
                 registerReceiver(mPebbleReceiver, new IntentFilter("com.getpebble.action.SEND_NOTIFICATION"));
             }
-            if (mMusicPlaybackReceiver == null && coordinator != null && coordinator.supportsMusicInfo()) {
+            if (mMusicPlaybackReceiver == null && features.supportsMusicInfo()) {
                 mMusicPlaybackReceiver = new MusicPlaybackReceiver();
                 IntentFilter filter = new IntentFilter();
                 for (String action : mMusicActions) {
@@ -771,10 +1030,6 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 filter.addAction("android.intent.action.TIMEZONE_CHANGED");
                 registerReceiver(mTimeChangeReceiver, filter);
             }
-            if (mBlueToothConnectReceiver == null) {
-                mBlueToothConnectReceiver = new BluetoothConnectReceiver(this);
-                registerReceiver(mBlueToothConnectReceiver, new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
-            }
             if (mBlueToothPairingRequestReceiver == null) {
                 mBlueToothPairingRequestReceiver = new BluetoothPairingRequestReceiver(this);
                 registerReceiver(mBlueToothPairingRequestReceiver, new IntentFilter(BluetoothDevice.ACTION_PAIRING_REQUEST));
@@ -790,7 +1045,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
             }
 
             // Weather receivers
-            if ( coordinator != null && coordinator.supportsWeather()) {
+            if (features.supportsWeather()) {
                 if (GBApplication.isRunningOreoOrLater()) {
                     if (mLineageOsWeatherReceiver == null) {
                         mLineageOsWeatherReceiver = new LineageOsWeatherReceiver();
@@ -818,7 +1073,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
             }
 
             if (GBApplication.getPrefs().getBoolean("auto_fetch_enabled", false) &&
-                    coordinator != null && coordinator.supportsActivityDataFetching() && mGBAutoFetchReceiver == null) {
+                    features.supportsActivityDataFetching() && mGBAutoFetchReceiver == null) {
                 mGBAutoFetchReceiver = new GBAutoFetchReceiver();
                 registerReceiver(mGBAutoFetchReceiver, new IntentFilter("android.intent.action.USER_PRESENT"));
             }
@@ -847,10 +1102,6 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
                 unregisterReceiver(mTimeChangeReceiver);
                 mTimeChangeReceiver = null;
             }
-            if (mBlueToothConnectReceiver != null) {
-                unregisterReceiver(mBlueToothConnectReceiver);
-                mBlueToothConnectReceiver = null;
-            }
 
             if (mBlueToothPairingRequestReceiver != null) {
                 unregisterReceiver(mBlueToothPairingRequestReceiver);
@@ -900,7 +1151,15 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
         LocalBroadcastManager.getInstance(this).unregisterReceiver(mReceiver);
         setReceiversEnableState(false, false, null); // disable BroadcastReceivers
 
-        setDeviceSupport(null);
+        unregisterReceiver(mBlueToothConnectReceiver);
+
+        for(GBDevice device : getGBDevices()){
+            try {
+                removeDeviceSupport(device);
+            } catch (DeviceNotFoundException e) {
+                e.printStackTrace();
+            }
+        }
         GB.removeNotification(GB.NOTIFICATION_ID, this); // need to do this because the updated notification won't be cancelled when service stops
     }
 
@@ -911,10 +1170,10 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-        if (GBPrefs.AUTO_RECONNECT.equals(key)) {
+        if (GBPrefs.DEVICE_AUTO_RECONNECT.equals(key)) {
-            boolean autoReconnect = getGBPrefs().getAutoReconnect();
+            for(DeviceStruct deviceStruct : deviceStructs){
-            if (mDeviceSupport != null) {
+                boolean autoReconnect = getGBPrefs().getAutoReconnect(deviceStruct.getDevice());
-                mDeviceSupport.setAutoReconnect(autoReconnect);
+                deviceStruct.getDeviceSupport().setAutoReconnect(autoReconnect);
             }
         }
         if (GBPrefs.CHART_MAX_HEART_RATE.equals(key) || GBPrefs.CHART_MIN_HEART_RATE.equals(key)) {
@@ -934,7 +1193,11 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
         return GBApplication.getGBPrefs();
     }
 
-    public GBDevice getGBDevice() {
+    public GBDevice[] getGBDevices() {
-        return mGBDevice;
+        GBDevice[] devices = new GBDevice[deviceStructs.size()];
+        for(int i = 0; i < devices.length; i++){
+            devices[i] = deviceStructs.get(i).getDevice();
+        }
+        return devices;
     }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceSupportFactory.java

@@ -161,248 +161,170 @@ public class DeviceSupportFactory {
         }
     }
 
+    private ServiceDeviceSupport createServiceDeviceSupport(GBDevice device){
+        switch (device.getType()) {
+            case PEBBLE:
+                return new ServiceDeviceSupport(new PebbleSupport());
+            case MIBAND:
+                return new ServiceDeviceSupport(new MiBandSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case MIBAND2:
+                return new ServiceDeviceSupport(new HuamiSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case MIBAND3:
+                return new ServiceDeviceSupport(new MiBand3Support());
+            case MIBAND4:
+                return new ServiceDeviceSupport(new MiBand4Support());
+            case MIBAND5:
+                return new ServiceDeviceSupport(new MiBand5Support());
+            case MIBAND6:
+                return new ServiceDeviceSupport(new MiBand6Support());
+            case AMAZFITBIP:
+                return new ServiceDeviceSupport(new AmazfitBipSupport());
+            case AMAZFITBIP_LITE:
+                return new ServiceDeviceSupport(new AmazfitBipLiteSupport());
+            case AMAZFITBIPS:
+                return new ServiceDeviceSupport(new AmazfitBipSSupport());
+            case AMAZFITBIPS_LITE:
+                return new ServiceDeviceSupport(new AmazfitBipSLiteSupport());
+            case AMAZFITBIPU:
+                return new ServiceDeviceSupport(new AmazfitBipUSupport());
+            case AMAZFITBIPUPRO:
+                return new ServiceDeviceSupport(new AmazfitBipUProSupport());
+            case AMAZFITPOP:
+                return new ServiceDeviceSupport(new AmazfitPopSupport());
+            case AMAZFITPOPPRO:
+                return new ServiceDeviceSupport(new AmazfitPopProSupport());
+            case AMAZFITGTR:
+                return new ServiceDeviceSupport(new AmazfitGTRSupport());
+            case AMAZFITGTR_LITE:
+                return new ServiceDeviceSupport(new AmazfitGTRLiteSupport());
+            case AMAZFITGTR2:
+                return new ServiceDeviceSupport(new AmazfitGTR2Support());
+            case ZEPP_E:
+                return new ServiceDeviceSupport(new ZeppESupport());
+            case AMAZFITGTR2E:
+                return new ServiceDeviceSupport(new AmazfitGTR2eSupport());
+            case AMAZFITTREX:
+                return new ServiceDeviceSupport(new AmazfitTRexSupport());
+            case AMAZFITTREXPRO:
+                return new ServiceDeviceSupport(new AmazfitTRexProSupport());
+            case AMAZFITGTS:
+                return new ServiceDeviceSupport(new AmazfitGTSSupport());
+            case AMAZFITVERGEL:
+                return new ServiceDeviceSupport(new AmazfitVergeLSupport());
+            case AMAZFITGTS2:
+                return new ServiceDeviceSupport(new AmazfitGTS2Support());
+            case AMAZFITGTS2_MINI:
+                return new ServiceDeviceSupport(new AmazfitGTS2MiniSupport());
+            case AMAZFITGTS2E:
+                return new ServiceDeviceSupport(new AmazfitGTS2eSupport());
+            case AMAZFITCOR:
+                return new ServiceDeviceSupport(new AmazfitCorSupport());
+            case AMAZFITCOR2:
+                return new ServiceDeviceSupport(new AmazfitCor2Support());
+            case AMAZFITBAND5:
+                return new ServiceDeviceSupport(new AmazfitBand5Support());
+            case AMAZFITX:
+                return new ServiceDeviceSupport(new AmazfitXSupport());
+            case AMAZFITNEO:
+                return new ServiceDeviceSupport(new AmazfitNeoSupport());
+            case VIBRATISSIMO:
+                return new ServiceDeviceSupport(new VibratissimoSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case LIVEVIEW:
+                return new ServiceDeviceSupport(new LiveviewSupport());
+            case HPLUS:
+            case MAKIBESF68:
+            case EXRIZUK8:
+            case Q8:
+                return new ServiceDeviceSupport(new HPlusSupport(device.getType()));
+            case NO1F1:
+                return new ServiceDeviceSupport(new No1F1Support());
+            case TECLASTH30:
+                return new ServiceDeviceSupport(new TeclastH30Support());
+            case XWATCH:
+                return new ServiceDeviceSupport(new XWatchSupport());
+            case FOSSILQHYBRID:
+                return new ServiceDeviceSupport(new QHybridSupport());
+            case ZETIME:
+                return new ServiceDeviceSupport(new ZeTimeDeviceSupport());
+            case ID115:
+                return new ServiceDeviceSupport(new ID115Support());
+            case WATCH9:
+                return new ServiceDeviceSupport(new Watch9DeviceSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case WATCHXPLUS:
+                return new ServiceDeviceSupport(new WatchXPlusDeviceSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case ROIDMI:
+                return new ServiceDeviceSupport(new RoidmiSupport());
+            case ROIDMI3:
+                return new ServiceDeviceSupport(new RoidmiSupport());
+            case Y5:
+                return new ServiceDeviceSupport(new Y5Support());
+            case CASIOGB6900:
+                return new ServiceDeviceSupport(new CasioGB6900DeviceSupport());
+            case CASIOGBX100:
+                return new ServiceDeviceSupport(new CasioGBX100DeviceSupport());
+            case MISCALE2:
+                return new ServiceDeviceSupport(new MiScale2DeviceSupport());
+            case BFH16:
+                return new ServiceDeviceSupport(new BFH16DeviceSupport());
+            case MIJIA_LYWSD02:
+                return new ServiceDeviceSupport(new MijiaLywsd02Support());
+            case MAKIBESHR3:
+                return new ServiceDeviceSupport(new MakibesHR3DeviceSupport());
+            case ITAG:
+                return new ServiceDeviceSupport(new ITagSupport());
+            case NUTMINI:
+                return new ServiceDeviceSupport(new NutSupport());
+            case BANGLEJS:
+                return new ServiceDeviceSupport(new BangleJSDeviceSupport());
+            case TLW64:
+                return new ServiceDeviceSupport(new TLW64Support());
+            case PINETIME_JF:
+                return new ServiceDeviceSupport(new PineTimeJFSupport());
+            case SG2:
+                return new ServiceDeviceSupport(new HPlusSupport(DeviceType.SG2));
+            case LEFUN:
+                return new ServiceDeviceSupport(new LefunDeviceSupport());
+            case SONY_SWR12:
+                return new ServiceDeviceSupport(new SonySWR12DeviceSupport());
+            case WASPOS:
+                return new ServiceDeviceSupport(new WaspOSDeviceSupport());
+            case SMAQ2OSS:
+                return new ServiceDeviceSupport(new SMAQ2OSSSupport());
+            case UM25:
+                return new ServiceDeviceSupport(new UM25Support());
+            case DOMYOS_T540:
+                return new ServiceDeviceSupport(new DomyosT540Support(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case FITPRO:
+                return new ServiceDeviceSupport(new FitProDeviceSupport(), ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case NOTHING_EAR1:
+                return new ServiceDeviceSupport(new Ear1Support());
+            case GALAXY_BUDS:
+                return new ServiceDeviceSupport(new GalaxyBudsDeviceSupport());
+            case GALAXY_BUDS_LIVE:
+                return new ServiceDeviceSupport(new GalaxyBudsDeviceSupport());
+            case GALAXY_BUDS_PRO:
+                return new ServiceDeviceSupport(new GalaxyBudsDeviceSupport(), ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case SONY_WH_1000XM3:
+                return new ServiceDeviceSupport(new SonyHeadphonesSupport());
+            case SONY_WH_1000XM4:
+                return new ServiceDeviceSupport(new SonyHeadphonesSupport());
+            case SONY_WF_SP800N:
+                return new ServiceDeviceSupport(new SonyHeadphonesSupport(), ServiceDeviceSupport.Flags.BUSY_CHECKING);
+            case SONY_WF_1000XM3:
+                return new ServiceDeviceSupport(new SonyHeadphonesSupport());
+            case VESC_NRF:
+            case VESC_HM10:
+                return new ServiceDeviceSupport(new VescDeviceSupport(device.getType()));
+            case BOSE_QC35:
+                return new ServiceDeviceSupport(new QC35BaseSupport());
+        }
+        return null;
+    }
+
     private DeviceSupport createBTDeviceSupport(GBDevice gbDevice) throws GBException {
         if (mBtAdapter != null && mBtAdapter.isEnabled()) {
-            DeviceSupport deviceSupport = null;
-
             try {
-                switch (gbDevice.getType()) {
+                DeviceSupport deviceSupport = createServiceDeviceSupport(gbDevice);
-                    case PEBBLE:
-                        deviceSupport = new ServiceDeviceSupport(new PebbleSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND:
-                        deviceSupport = new ServiceDeviceSupport(new MiBandSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND2:
-                        deviceSupport = new ServiceDeviceSupport(new HuamiSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND3:
-                        deviceSupport = new ServiceDeviceSupport(new MiBand3Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND4:
-                        deviceSupport = new ServiceDeviceSupport(new MiBand4Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND5:
-                        deviceSupport = new ServiceDeviceSupport(new MiBand5Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIBAND6:
-                        deviceSupport = new ServiceDeviceSupport(new MiBand6Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIP:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIP_LITE:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipLiteSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIPS:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipSSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIPS_LITE:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipSLiteSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIPU:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipUSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBIPUPRO:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBipUProSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITPOP:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitPopSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITPOPPRO:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitPopProSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTR:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTRSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTR_LITE:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTRLiteSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTR2:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTR2Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ZEPP_E:
-                        deviceSupport = new ServiceDeviceSupport(new ZeppESupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTR2E:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTR2eSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITTREX:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitTRexSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITTREXPRO:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitTRexProSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTS:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTSSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITVERGEL:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitVergeLSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTS2:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTS2Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTS2_MINI:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTS2MiniSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITGTS2E:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitGTS2eSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITCOR:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitCorSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITCOR2:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitCor2Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITBAND5:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitBand5Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITX:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitXSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case AMAZFITNEO:
-                        deviceSupport = new ServiceDeviceSupport(new AmazfitNeoSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case VIBRATISSIMO:
-                        deviceSupport = new ServiceDeviceSupport(new VibratissimoSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case LIVEVIEW:
-                        deviceSupport = new ServiceDeviceSupport(new LiveviewSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case HPLUS:
-                        deviceSupport = new ServiceDeviceSupport(new HPlusSupport(DeviceType.HPLUS), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MAKIBESF68:
-                        deviceSupport = new ServiceDeviceSupport(new HPlusSupport(DeviceType.MAKIBESF68), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case EXRIZUK8:
-                        deviceSupport = new ServiceDeviceSupport(new HPlusSupport(DeviceType.EXRIZUK8), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case Q8:
-                        deviceSupport = new ServiceDeviceSupport(new HPlusSupport(DeviceType.Q8), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case NO1F1:
-                        deviceSupport = new ServiceDeviceSupport(new No1F1Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case TECLASTH30:
-                        deviceSupport = new ServiceDeviceSupport(new TeclastH30Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case XWATCH:
-                        deviceSupport = new ServiceDeviceSupport(new XWatchSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case FOSSILQHYBRID:
-                        deviceSupport = new ServiceDeviceSupport(new QHybridSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ZETIME:
-                        deviceSupport = new ServiceDeviceSupport(new ZeTimeDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ID115:
-                        deviceSupport = new ServiceDeviceSupport(new ID115Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case WATCH9:
-                        deviceSupport = new ServiceDeviceSupport(new Watch9DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case WATCHXPLUS:
-                        deviceSupport = new ServiceDeviceSupport(new WatchXPlusDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ROIDMI:
-                        deviceSupport = new ServiceDeviceSupport(new RoidmiSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ROIDMI3:
-                        deviceSupport = new ServiceDeviceSupport(new RoidmiSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case Y5:
-                        deviceSupport = new ServiceDeviceSupport(new Y5Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case CASIOGB6900:
-                        deviceSupport = new ServiceDeviceSupport(new CasioGB6900DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case CASIOGBX100:
-                        deviceSupport = new ServiceDeviceSupport(new CasioGBX100DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MISCALE2:
-                        deviceSupport = new ServiceDeviceSupport(new MiScale2DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case BFH16:
-                        deviceSupport = new ServiceDeviceSupport(new BFH16DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MIJIA_LYWSD02:
-                        deviceSupport = new ServiceDeviceSupport(new MijiaLywsd02Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case MAKIBESHR3:
-                        deviceSupport = new ServiceDeviceSupport(new MakibesHR3DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case ITAG:
-                        deviceSupport = new ServiceDeviceSupport(new ITagSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case NUTMINI:
-                        deviceSupport = new ServiceDeviceSupport(new NutSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case BANGLEJS:
-                        deviceSupport = new ServiceDeviceSupport(new BangleJSDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case TLW64:
-                        deviceSupport = new ServiceDeviceSupport(new TLW64Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case PINETIME_JF:
-                        deviceSupport = new ServiceDeviceSupport(new PineTimeJFSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SG2:
-                        deviceSupport = new ServiceDeviceSupport(new HPlusSupport(DeviceType.SG2), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case LEFUN:
-                        deviceSupport = new ServiceDeviceSupport(new LefunDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SONY_SWR12:
-                        deviceSupport = new ServiceDeviceSupport(new SonySWR12DeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case WASPOS:
-                        deviceSupport = new ServiceDeviceSupport(new WaspOSDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SMAQ2OSS:
-                        deviceSupport = new ServiceDeviceSupport(new SMAQ2OSSSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case UM25:
-                        deviceSupport = new ServiceDeviceSupport(new UM25Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case DOMYOS_T540:
-                        deviceSupport = new ServiceDeviceSupport(new DomyosT540Support(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case FITPRO:
-                        deviceSupport = new ServiceDeviceSupport(new FitProDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.THROTTLING, ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case NOTHING_EAR1:
-                        deviceSupport = new ServiceDeviceSupport(new Ear1Support(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case GALAXY_BUDS:
-                        deviceSupport = new ServiceDeviceSupport(new GalaxyBudsDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case GALAXY_BUDS_LIVE:
-                        deviceSupport = new ServiceDeviceSupport(new GalaxyBudsDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case GALAXY_BUDS_PRO:
-                        deviceSupport = new ServiceDeviceSupport(new GalaxyBudsDeviceSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SONY_WH_1000XM3:
-                        deviceSupport = new ServiceDeviceSupport(new SonyHeadphonesSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SONY_WH_1000XM4:
-                        deviceSupport = new ServiceDeviceSupport(new SonyHeadphonesSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SONY_WF_SP800N:
-                        deviceSupport = new ServiceDeviceSupport(new SonyHeadphonesSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case SONY_WF_1000XM3:
-                        deviceSupport = new ServiceDeviceSupport(new SonyHeadphonesSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case VESC_NRF:
-                    case VESC_HM10:
-                        deviceSupport = new ServiceDeviceSupport(new VescDeviceSupport(gbDevice.getType()), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                    case BOSE_QC35:
-                        deviceSupport = new ServiceDeviceSupport(new QC35BaseSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
-                        break;
-                }
                 if (deviceSupport != null) {
                     deviceSupport.setContext(gbDevice, mBtAdapter, mContext);
                     return deviceSupport;
@@ -416,7 +338,7 @@ public class DeviceSupportFactory {
 
     private DeviceSupport createTCPDeviceSupport(GBDevice gbDevice) throws GBException {
         try {
-            DeviceSupport deviceSupport = new ServiceDeviceSupport(new PebbleSupport(), EnumSet.of(ServiceDeviceSupport.Flags.BUSY_CHECKING));
+            DeviceSupport deviceSupport = new ServiceDeviceSupport(new PebbleSupport(), ServiceDeviceSupport.Flags.BUSY_CHECKING);
             deviceSupport.setContext(gbDevice, mBtAdapter, mContext);
             return deviceSupport;
         } catch (Exception e) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/ServiceDeviceSupport.java

@@ -27,6 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.UUID;
 
@@ -61,9 +62,14 @@ public class ServiceDeviceSupport implements DeviceSupport {
     private String lastNotificationKind;
     private final EnumSet<Flags> flags;
 
-    public ServiceDeviceSupport(DeviceSupport delegate, EnumSet<Flags> flags) {
+    public ServiceDeviceSupport(DeviceSupport delegate, Flags... flags) {
         this.delegate = delegate;
-        this.flags = flags;
+        this.flags = EnumSet.noneOf(Flags.class);
+        this.flags.addAll(Arrays.asList(flags));
+    }
+
+    public ServiceDeviceSupport(DeviceSupport delegate){
+        this(delegate, Flags.BUSY_CHECKING);
     }
 
     @Override

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

@@ -17,6 +17,7 @@
 package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.amazfitbip;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
@@ -69,8 +70,8 @@ public class AmazfitBipLiteFirmwareInfo extends HuamiFirmwareInfo {
             if (searchString32BitAligned(bytes, "Amazfit Bip Lite")) {
                 return HuamiFirmwareType.FIRMWARE;
             }
-            GBDevice device = GBApplication.app().getDeviceManager().getSelectedDevice();
+            List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-            if (device != null) {
+            for(GBDevice device : devices){
                 Prefs prefs = new Prefs(GBApplication.getDeviceSpecificSharedPrefs(device.getAddress()));
                 if (prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_RELAX_FIRMWARE_CHECKS, false)) {
                     if (searchString32BitAligned(bytes, "Amazfit Bip")) {

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

@@ -17,6 +17,7 @@
 package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.amazfitbips;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
@@ -66,10 +67,8 @@ public class AmazfitBipSFirmwareInfo extends HuamiFirmwareInfo {
 
     @Override
     protected HuamiFirmwareType determineFirmwareType(byte[] bytes) {
-
+        List<GBDevice> devices = GBApplication.app().getDeviceManager().getSelectedDevices();
-        GBDevice device = GBApplication.app().getDeviceManager().getSelectedDevice();
+        for (GBDevice device : devices) {
-
-        if (device != null) {
             if (device.getFirmwareVersion().startsWith("2.")) {
                 //For devices on firmware 2.x it is a tonleasp device and needs a header which looks like Mi Band 4
                 if (ArrayUtils.equals(bytes, MiBand4FirmwareInfo.FW_HEADER, MiBand4FirmwareInfo.FW_HEADER_OFFSET)) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleIoThread.java

@@ -242,7 +242,7 @@ class PebbleIoThread extends GBDeviceIoThread {
     public void run() {
         mIsConnected = connect();
         if (!mIsConnected) {
-            if (GBApplication.getGBPrefs().getAutoReconnect() && !mQuit) {
+            if (GBApplication.getGBPrefs().getAutoReconnect(getDevice()) && !mQuit) {
                 gbDevice.setState(GBDevice.State.WAITING_FOR_RECONNECT);
                 gbDevice.sendDeviceUpdateIntent(getContext());
             }
@@ -406,7 +406,7 @@ class PebbleIoThread extends GBDeviceIoThread {
 
         enablePebbleKitSupport(false);
 
-        if (mQuit || !GBApplication.getGBPrefs().getAutoReconnect()) {
+        if (mQuit || !GBApplication.getGBPrefs().getAutoReconnect(getDevice())) {
             gbDevice.setState(GBDevice.State.NOT_CONNECTED);
         } else {
             gbDevice.setState(GBDevice.State.WAITING_FOR_RECONNECT);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/qc35/QC35BaseSupport.java

@@ -69,7 +69,7 @@ public class QC35BaseSupport extends AbstractSerialDeviceSupport {
     public boolean connect() {
         getDeviceProtocol();
         getDeviceIOThread().start();
-        getDevice().setBatteryThresholdPercent((short)15);
+        getDevice().setBatteryThresholdPercent((short)25);
         return true;
     }
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/qc35/QC35Protocol.java

@@ -29,6 +29,7 @@ import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSett
 import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEvent;
 import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventBatteryInfo;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
+import nodomain.freeyourgadget.gadgetbridge.model.BatteryState;
 import nodomain.freeyourgadget.gadgetbridge.service.serial.GBDeviceProtocol;
 import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
 
@@ -57,6 +58,7 @@ public class QC35Protocol extends GBDeviceProtocol {
                     if(third == 0x03){
                         GBDeviceEventBatteryInfo batteryInfo = new GBDeviceEventBatteryInfo();
                         batteryInfo.level = data[0];
+                        batteryInfo.state = BatteryState.BATTERY_NORMAL;
                         events.add(batteryInfo);
                     }
                 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/receivers/AutoConnectIntervalReceiver.java

@@ -58,24 +58,31 @@ public class AutoConnectIntervalReceiver extends BroadcastReceiver {
             return;
         }
 
-        GBDevice gbDevice = service.getGBDevice();
+        GBDevice[] devices = service.getGBDevices();
-        if (gbDevice == null) {
+        if (action.equals(DeviceManager.ACTION_DEVICES_CHANGED)){
-            return;
+            boolean scheduleAutoConnect = false;
-        }
+            boolean allDevicesInitialized = true;
-
+            for(GBDevice device : devices){
-        if (action.equals(DeviceManager.ACTION_DEVICES_CHANGED)) {
+                if(!device.isInitialized()){
-            if (gbDevice.isInitialized()) {
+                    allDevicesInitialized = false;
-                LOG.info("will reset connection delay, device is initialized!");
+                }else if(device.getState() == GBDevice.State.WAITING_FOR_RECONNECT){
-                mDelay = 4;
+                    scheduleAutoConnect = true;
+                }
             }
-            else if (gbDevice.getState() == GBDevice.State.WAITING_FOR_RECONNECT) {
+
+            if(allDevicesInitialized){
+                LOG.info("will reset connection delay, all devices are initialized!");
+                return;
+            }
+            if(scheduleAutoConnect){
                 scheduleReconnect();
             }
-        }
+        }else if (action.equals("GB_RECONNECT")){
-        else if (action.equals("GB_RECONNECT")) {
+            for(GBDevice device : devices){
-            if (gbDevice.getState() == GBDevice.State.WAITING_FOR_RECONNECT) {
+                if(device.getState() == GBDevice.State.WAITING_FOR_RECONNECT) {
-                LOG.info("Will re-connect to " + gbDevice.getAddress() + "(" + gbDevice.getName() + ")");
+                    LOG.info("Will re-connect to " + device.getAddress() + "(" + device.getName() + ")");
-                GBApplication.deviceService().connect();
+                    GBApplication.deviceService().connect(device);
+                }
             }
         }
     }

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

@@ -180,7 +180,7 @@ public class BondingUtil {
     public static void connectThenComplete(BondingInterface bondingInterface, GBDevice device) {
         toast(bondingInterface.getContext(), bondingInterface.getContext().getString(R.string.discovery_trying_to_connect_to, device.getName()), Toast.LENGTH_SHORT, GB.INFO);
         // Disconnect when LE Pebble so that the user can manually initiate a connection
-        GBApplication.deviceService().disconnect();
+        GBApplication.deviceService().disconnect(device);
         GBApplication.deviceService().connect(device, true);
         bondingInterface.onBondingComplete(true);
     }

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

@@ -29,6 +29,8 @@ import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.os.Handler;
 import android.os.Looper;
+import android.text.Html;
+import android.text.SpannableString;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
@@ -44,6 +46,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.util.List;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.GBEnvironment;
@@ -145,44 +148,102 @@ public class GB {
         return pendingIntent;
     }
 
-    public static Notification createNotification(GBDevice device, Context context) {
+    public static Notification createNotification(List<GBDevice> devices, Context context) {
-        String deviceName = device.getAliasOrName();
-        String text = device.getStateString();
-        if (device.getBatteryLevel() != GBDevice.BATTERY_UNKNOWN) {
-            text += ": " + context.getString(R.string.battery) + " " + device.getBatteryLevel() + "%";
-        }
-
-        boolean connected = device.isInitialized();
         NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
-        builder.setContentTitle(deviceName)
+        if(devices.size() == 0){
-                .setTicker(deviceName + " - " + text)
+            builder.setContentTitle(context.getString(R.string.info_no_devices_connected))
-                .setContentText(text)
+                    .setSmallIcon(R.drawable.ic_notification_disconnected)
-                .setSmallIcon(connected ? device.getNotificationIconConnected() : device.getNotificationIconDisconnected())
+                    .setContentIntent(getContentIntent(context))
-                .setContentIntent(getContentIntent(context))
+                    .setShowWhen(false)
-                .setShowWhen(false)
+                    .setOngoing(true);
-                .setOngoing(true);
 
-        if (!GBApplication.isRunningTwelveOrLater()) {
+            if (!GBApplication.isRunningTwelveOrLater()) {
-            builder.setColor(context.getResources().getColor(R.color.accent));
+                builder.setColor(context.getResources().getColor(R.color.accent));
-        }
+            }
+        }else if(devices.size() == 1) {
+            GBDevice device = devices.get(0);
+            String deviceName = device.getAliasOrName();
+            String text = device.getStateString();
+            if (device.getBatteryLevel() != GBDevice.BATTERY_UNKNOWN) {
+                text += ": " + context.getString(R.string.battery) + " " + device.getBatteryLevel() + "%";
+            }
 
-        Intent deviceCommunicationServiceIntent = new Intent(context, DeviceCommunicationService.class);
+            boolean connected = device.isInitialized();
-        if (connected) {
+            builder.setContentTitle(deviceName)
-            deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_DISCONNECT);
+                    .setTicker(deviceName + " - " + text)
-            PendingIntent disconnectPendingIntent = PendingIntent.getService(context, 0, deviceCommunicationServiceIntent, PendingIntent.FLAG_ONE_SHOT);
+                    .setContentText(text)
-            builder.addAction(R.drawable.ic_notification_disconnected, context.getString(R.string.controlcenter_disconnect), disconnectPendingIntent);
+                    .setSmallIcon(connected ? device.getNotificationIconConnected() : device.getNotificationIconDisconnected())
-            if (GBApplication.isRunningLollipopOrLater() && DeviceHelper.getInstance().getCoordinator(device).supportsActivityDataFetching()) { //for some reason this fails on KK
+                    .setContentIntent(getContentIntent(context))
+                    .setShowWhen(false)
+                    .setOngoing(true);
+
+            if (!GBApplication.isRunningTwelveOrLater()) {
+                builder.setColor(context.getResources().getColor(R.color.accent));
+            }
+
+            Intent deviceCommunicationServiceIntent = new Intent(context, DeviceCommunicationService.class);
+            if (connected) {
+                deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_DISCONNECT);
+                PendingIntent disconnectPendingIntent = PendingIntent.getService(context, 0, deviceCommunicationServiceIntent, PendingIntent.FLAG_ONE_SHOT);
+                builder.addAction(R.drawable.ic_notification_disconnected, context.getString(R.string.controlcenter_disconnect), disconnectPendingIntent);
+                if (GBApplication.isRunningLollipopOrLater() && DeviceHelper.getInstance().getCoordinator(device).supportsActivityDataFetching()) { //for some reason this fails on KK
+                    deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_FETCH_RECORDED_DATA);
+                    deviceCommunicationServiceIntent.putExtra(EXTRA_RECORDED_DATA_TYPES, ActivityKind.TYPE_ACTIVITY);
+                    PendingIntent fetchPendingIntent = PendingIntent.getService(context, 1, deviceCommunicationServiceIntent, PendingIntent.FLAG_ONE_SHOT);
+                    builder.addAction(R.drawable.ic_refresh, context.getString(R.string.controlcenter_fetch_activity_data), fetchPendingIntent);
+                }
+            } else if (device.getState().equals(GBDevice.State.WAITING_FOR_RECONNECT) || device.getState().equals(GBDevice.State.NOT_CONNECTED)) {
+                deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_CONNECT);
+                deviceCommunicationServiceIntent.putExtra(GBDevice.EXTRA_DEVICE, device);
+                PendingIntent reconnectPendingIntent = PendingIntent.getService(context, 2, deviceCommunicationServiceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
+                builder.addAction(R.drawable.ic_notification, context.getString(R.string.controlcenter_connect), reconnectPendingIntent);
+            }
+        }else{
+            StringBuilder contentText = new StringBuilder();
+            boolean isConnected = true;
+            boolean anyDeviceSupportesActivityDataFetching = false;
+            for(GBDevice device : devices){
+                if(!device.isInitialized()){
+                    isConnected = false;
+                }
+
+                anyDeviceSupportesActivityDataFetching |= DeviceHelper.getInstance().getCoordinator(device).supportsActivityDataFetching();
+
+                String deviceName = device.getAliasOrName();
+                String text = device.getStateString();
+                if (device.getBatteryLevel() != GBDevice.BATTERY_UNKNOWN) {
+                    text += ": " + context.getString(R.string.battery) + " " + device.getBatteryLevel() + "%";
+                }
+                contentText.append(deviceName).append(" (").append(text).append(")<br>");
+            }
+
+            SpannableString formated = new SpannableString(
+                    Html.fromHtml(contentText.substring(0, contentText.length() - 4)) // cut away last <br>
+            );
+
+            String title = context.getString(R.string.info_connected_count, devices.size());
+
+            builder.setContentTitle(title)
+                    .setContentText(formated)
+                    .setSmallIcon(isConnected ? R.drawable.ic_notification : R.drawable.ic_notification_disconnected)
+                    .setContentIntent(getContentIntent(context))
+                    .setStyle(new NotificationCompat.BigTextStyle().bigText(formated).setBigContentTitle(title))
+                    .setShowWhen(false)
+                    .setOngoing(true);
+
+            if (!GBApplication.isRunningTwelveOrLater()) {
+                builder.setColor(context.getResources().getColor(R.color.accent));
+            }
+
+            if (GBApplication.isRunningLollipopOrLater() && anyDeviceSupportesActivityDataFetching) { //for some reason this fails on KK
+                Intent deviceCommunicationServiceIntent = new Intent(context, DeviceCommunicationService.class);
                 deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_FETCH_RECORDED_DATA);
                 deviceCommunicationServiceIntent.putExtra(EXTRA_RECORDED_DATA_TYPES, ActivityKind.TYPE_ACTIVITY);
                 PendingIntent fetchPendingIntent = PendingIntent.getService(context, 1, deviceCommunicationServiceIntent, PendingIntent.FLAG_ONE_SHOT);
                 builder.addAction(R.drawable.ic_refresh, context.getString(R.string.controlcenter_fetch_activity_data), fetchPendingIntent);
             }
-        } else if (device.getState().equals(GBDevice.State.WAITING_FOR_RECONNECT) || device.getState().equals(GBDevice.State.NOT_CONNECTED)) {
-            deviceCommunicationServiceIntent.setAction(DeviceService.ACTION_CONNECT);
-            deviceCommunicationServiceIntent.putExtra(GBDevice.EXTRA_DEVICE, device);
-            PendingIntent reconnectPendingIntent = PendingIntent.getService(context, 2, deviceCommunicationServiceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
-            builder.addAction(R.drawable.ic_notification, context.getString(R.string.controlcenter_connect), reconnectPendingIntent);
         }
+
         if (GBApplication.isRunningLollipopOrLater()) {
             builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
         }
@@ -220,8 +281,8 @@ public class GB {
         return builder.build();
     }
 
-    public static void updateNotification(GBDevice device, Context context) {
+    public static void updateNotification(List<GBDevice> devices, Context context) {
-        Notification notification = createNotification(device, context);
+        Notification notification = createNotification(devices, context);
         notify(NOTIFICATION_ID, notification, context);
     }
 

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

@@ -19,6 +19,7 @@ package nodomain.freeyourgadget.gadgetbridge.util;
 
 import android.Manifest;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.location.Criteria;
 import android.location.Location;
@@ -33,6 +34,7 @@ import java.util.Date;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst;
+import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 
 public class GBPrefs {
     // Since this class must not log to slf4j, we use plain android.util.Log
@@ -41,7 +43,8 @@ public class GBPrefs {
     public static final String PACKAGE_BLACKLIST = "package_blacklist";
     public static final String PACKAGE_PEBBLEMSG_BLACKLIST = "package_pebblemsg_blacklist";
     public static final String CALENDAR_BLACKLIST = "calendar_blacklist";
-    public static final String AUTO_RECONNECT = "general_autocreconnect";
+    public static final String DEVICE_AUTO_RECONNECT = "prefs_key_device_auto_reconnect";
+    public static final String DEVICE_CONNECT_BACK = "prefs_key_device_reconnect_on_acl";
     private static final String AUTO_START = "general_autostartonboot";
     public static final String AUTO_EXPORT_ENABLED = "auto_export_enabled";
     public static final String AUTO_EXPORT_LOCATION = "auto_export_location";
@@ -67,8 +70,9 @@ public class GBPrefs {
         mPrefs = prefs;
     }
 
-    public boolean getAutoReconnect() {
+    public boolean getAutoReconnect(GBDevice device) {
-        return mPrefs.getBoolean(AUTO_RECONNECT, AUTO_RECONNECT_DEFAULT);
+        SharedPreferences deviceSpecificPreferences = GBApplication.getDeviceSpecificSharedPrefs(device.getAddress());
+        return deviceSpecificPreferences.getBoolean(DEVICE_AUTO_RECONNECT, AUTO_RECONNECT_DEFAULT);
     }
 
     public boolean getAutoStart() {

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

@@ -1628,4 +1628,7 @@
     <string name="about_activity_title_banglejs_nopebble">Über Bangle.js Gadgetbridge</string>
     <string name="pref_device_action_fitness_app_control_toggle">Fitness-App-Tracking umschalten</string>
     <string name="pref_title_banglejs_text_bitmap">Text als Bitmaps</string>
+
+    <string name="info_connected_count">%d Geräte verbunden</string>
+    <string name="info_no_devices_connected">Keine Geräte verbunden</string>
 </resources>

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

@@ -1666,4 +1666,7 @@
     <string name="pref_summary_opentracks_packagename">Used for starting/stopping GPS track recording in external fitness app.</string>
     <string name="watchface_dialog_pre_setting_position">pre-setting position to %s</string>
     <string name="watchface_setting_light_up_on_notification">Light up on new notification</string>
+
+    <string name="info_no_devices_connected">no devices connected</string>
+    <string name="info_connected_count">%d devices connected</string>
 </resources>

app/src/main/res/xml/devicesettings_reconnect_bl_classic.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory
+        android:title="Connection over Bluetooth classic" />
+
+    <CheckBoxPreference
+        android:key="prefs_key_device_reconnect_on_acl"
+        android:title="connect on connection from device"
+        android:summary="establish a connection when connection is initiated by device, like headphones"
+        android:layout="@layout/preference_checkbox" />
+</PreferenceScreen>

app/src/main/res/xml/devicesettings_reconnect_ble.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory
+        android:title="Connection over BLE" />
+
+    <CheckBoxPreference
+        android:key="prefs_key_device_auto_reconnect"
+        android:title="auto-reconnect to device"
+        android:summary="proactively try to connect to device periodically"
+        android:layout="@layout/preference_checkbox" />
+</PreferenceScreen>

app/src/main/res/xml/preferences.xml

@@ -17,7 +17,9 @@
             android:layout="@layout/preference_checkbox"
             android:defaultValue="false"
             android:key="general_autocreconnect"
-            android:title="@string/pref_title_general_autoreconnect" />
+            android:title="@string/pref_title_general_autoreconnect"
+            android:enabled="false"
+            android:summary="setting has been moved to device specific settings"/>
         <CheckBoxPreference
             android:layout="@layout/preference_checkbox"
             android:defaultValue="true"