WIP: Alert Notification Profile

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btle/profiles/alertnotification/AlertNotificationProfile.java

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+package nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.alertnotification;
+
+import nodomain.freeyourgadget.gadgetbridge.service.btle.AbstractBTLEDeviceSupport;
+import nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.AbstractBleProfile;
+
+public class AlertNotificationProfile<T extends AbstractBTLEDeviceSupport> extends AbstractBleProfile<T> {
+    public AlertNotificationProfile(T support) {
+        super(support);
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/btle/profiles/alertnotification/Category.java

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+package nodomain.freeyourgadget.gadgetbridge.service.btle.profiles.alertnotification;
+
+/**
+ * https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.alert_category_id.xml
+ * https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.alert_category_id_bit_mask.xml
+ */
+public enum Category {
+    Simple(0),
+    Email(1),
+    News(2),
+    IncomingCall(3),
+    MissedCall(4),
+    SMS(5),
+    VoiceMail(6),
+    Schedule(7),
+    HighPriorityAlert(8),
+    InstantMessage(9);
+    // 10-250 reserved for future use
+    // 251-255 defined by service specification
+
+    private final int id;
+
+    Category(int id) {
+        this.id = id;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    private int asBit() {
+        return byteNumber() <=7 ? 0 : 1;
+    }
+
+    private int byteNumber() {
+        return bitNumber() > 7 ? 0 : 1;
+    }
+
+    private int bitNumber() {
+        // the ID corresponds to the bit for the bitset
+        return id;
+    }
+
+    public static byte[] toBitmask(Category... categories) {
+        byte[] result = new byte[2];
+
+        for (Category category : categories) {
+            result[category.byteNumber()] |= category.asBit();
+        }
+        return result;
+    }
+}