diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/casio/gbx100/CasioGBX100DeviceCoordinator.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/casio/gbx100/CasioGBX100DeviceCoordinator.java
index 4a506817b..fb4cc144e 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/casio/gbx100/CasioGBX100DeviceCoordinator.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/casio/gbx100/CasioGBX100DeviceCoordinator.java
@@ -82,31 +82,11 @@ public class CasioGBX100DeviceCoordinator extends Casio2C2DDeviceCoordinator {
         return BONDING_STYLE_LAZY;
     }
 
-    @Override
-    public boolean supportsCalendarEvents() {
-        return false;
-    }
-
-    @Override
-    public boolean supportsRealtimeData() {
-        return false;
-    }
-
-    @Override
-    public boolean supportsWeather() {
-        return false;
-    }
-
     @Override
     public boolean supportsAlarmSnoozing() {
         return true;
     }
 
-    @Override
-    public boolean supportsFindDevice() {
-        return false;
-    }
-
     @Override
     public Class<? extends Activity> getPairingActivity() {
         return null;
@@ -132,26 +112,11 @@ public class CasioGBX100DeviceCoordinator extends Casio2C2DDeviceCoordinator {
         return new CasioGBX100SampleProvider(device, session);
     }
 
-    @Override
-    public boolean supportsScreenshots(final GBDevice device) {
-        return false;
-    }
-
     @Override
     public int getAlarmSlotCount(GBDevice device) {
         return 4;
     }
 
-    @Override
-    public boolean supportsHeartRateMeasurement(GBDevice device) {
-        return false;
-    }
-
-    @Override
-    public boolean supportsAppsManagement(final GBDevice device) {
-        return false;
-    }
-
     @Override
     public Class<? extends Activity> getAppsManagementActivity() {
         return null;
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
index 0626da017..120efa99b 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
@@ -53,6 +53,7 @@ import nodomain.freeyourgadget.gadgetbridge.model.NotificationSpec;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
 import nodomain.freeyourgadget.gadgetbridge.service.devices.casio.Casio2C2DSupport;
 import nodomain.freeyourgadget.gadgetbridge.util.GB;
+import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
 
 import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst.PREF_AUTOLIGHT;
 import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst.PREF_AUTOREMOVE_MESSAGE;
@@ -299,32 +300,27 @@ public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements Shared
         // If not a call or email, check the sender and if null, promote the title and message preview
         // as subtitle
         if (showMessagePreview && icon != CasioConstants.CATEGORY_INCOMING_CALL && icon != CasioConstants.CATEGORY_EMAIL) {
-            if (sender == null) {
+            if (!StringUtils.isNullOrEmpty(sender)) {
                 // Shift title to sender slot
                 sender = title;
             }
             //Shift content to title
-            if (message != null) {
+            if (!StringUtils.isNullOrEmpty(message)) {
                 title = message.substring(0, Math.min(message.length(), 18)) + "..";
             }
         }
 
         // Make sure title and sender are less than 32 characters
         byte[] titleBytes = new byte[0];
-        if(title != null) {
+        if (!StringUtils.isNullOrEmpty(title)) {
             if (title.length() > 32) {
                 title = title.substring(0, 30) + "..";
             }
             titleBytes = title.getBytes(StandardCharsets.UTF_8);
         }
 
-        byte[] messageBytes = new byte[0];
-        if(message != null) {
-            messageBytes = message.getBytes(StandardCharsets.UTF_8);
-        }
-
         byte[] senderBytes = new byte[0];
-        if(sender != null) {
+        if (!StringUtils.isNullOrEmpty(sender)) {
             if (sender.length() > 32) {
                 sender = sender.substring(0, 30) + "..";
             }
@@ -332,10 +328,17 @@ public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements Shared
         }
 
         byte[] subtitleBytes = new byte[0];
-        if (subtitle != null) {
+        if (!StringUtils.isNullOrEmpty(subtitle)) {
             subtitleBytes = subtitle.getBytes(StandardCharsets.UTF_8);
         }
 
+        // Ensure the sum of all messages is not over 287 bytes, as per #4063
+        // FIXME: We probably need to take the MTU into account too...
+        byte[] messageBytes = new byte[0];
+        if (!StringUtils.isNullOrEmpty(message)) {
+            messageBytes = StringUtils.truncateToBytes(message, 287 - titleBytes.length - senderBytes.length - subtitleBytes.length);
+        }
+
         byte[] arr = new byte[22];
         arr[0] = (byte)(id & 0xff);
         arr[1] = (byte) ((id >> 8) & 0xff);
@@ -400,10 +403,10 @@ public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements Shared
         try {
             TransactionBuilder builder = performInitialized("showNotification");
             builder.write(getCharacteristic(CasioConstants.CASIO_NOTIFICATION_CHARACTERISTIC_UUID), copy);
-            LOG.info("Showing notification, title: " + title + " message (not sent): " + message);
+            LOG.info("Showing notification, title: {} message: {}", title, message);
             builder.queue(getQueue());
         } catch (IOException e) {
-            LOG.warn("showNotification failed: " + e.getMessage());
+            LOG.error("showNotification failed", e);
         }
     }
 
@@ -432,7 +435,7 @@ public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements Shared
                 icon = CasioConstants.CATEGORY_OTHER;
                 break;
         }
-        LOG.info("onNotification id=" + notificationSpec.getId());
+        LOG.info("onNotification id={}", notificationSpec.getId());
         showNotification(icon, notificationSpec.sender, notificationSpec.title, notificationSpec.body, notificationSpec.getId(), false);
         mSyncedNotificationIDs.add(notificationSpec.getId());
         if(autoremove) {