Add GATT constants and pretty print them in debug driver

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothDebug.java

@@ -88,14 +88,14 @@ public class BluetoothDebug extends BluetoothCommunication {
     }
 
     private void logService(BluetoothGattService service, boolean included) {
-        Timber.d("Service %s%s", service.getUuid(), included ? " (included)" : "");
+        Timber.d("Service %s%s", BluetoothGattUuid.prettyPrint(service.getUuid()),
+                included ? " (included)" : "");
 
         for (BluetoothGattCharacteristic characteristic : service.getCharacteristics()) {
             Timber.d("|- characteristic %s (instance %d): %s, write type: %s (permissions=0x%x)",
-                    characteristic.getUuid(), characteristic.getInstanceId(),
+                    BluetoothGattUuid.prettyPrint(characteristic.getUuid()),
-                    propertiesToString(characteristic.getProperties()),
+                    characteristic.getInstanceId(), propertiesToString(characteristic.getProperties()),
-                    writeTypeToString(characteristic.getWriteType()),
+                    writeTypeToString(characteristic.getWriteType()), characteristic.getPermissions());
-                    characteristic.getPermissions());
             byte[] value = characteristic.getValue();
             if (value != null && value.length > 0) {
                 Timber.d("|--> value: %s (%s)", byteInHex(value),
@@ -104,7 +104,8 @@ public class BluetoothDebug extends BluetoothCommunication {
 
             for (BluetoothGattDescriptor descriptor : characteristic.getDescriptors()) {
                 Timber.d("|--- descriptor %s (permissions=0x%x)",
-                        descriptor.getUuid(), descriptor.getPermissions());
+                        BluetoothGattUuid.prettyPrint(descriptor.getUuid()),
+                        descriptor.getPermissions());
 
                 value = descriptor.getValue();
                 if (value != null && value.length > 0) {

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothGattUuid.java

@@ -0,0 +1,83 @@
+/* Copyright (C) 2018 Erik Johansson <erik@ejohansson.se>
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.health.openscale.core.bluetooth;
+
+import java.lang.reflect.Field;
+import java.util.UUID;
+
+public class BluetoothGattUuid {
+    private static final String STANDARD_SUFFIX = "-0000-1000-8000-00805f9b34fb";
+
+    public static final UUID fromShortCode(long code) {
+        return UUID.fromString(String.format("%08x%s", code, STANDARD_SUFFIX));
+    }
+
+    public static final String prettyPrint(UUID uuid) {
+        for (Field field : BluetoothGattUuid.class.getFields()) {
+            try {
+                if (uuid.equals(field.get(null))) {
+                    final String name = field.getName();
+                    return name.substring(name.indexOf('_') + 1);
+                }
+            }
+            catch (IllegalAccessException e) {
+                // Ignore
+            }
+        }
+
+        final String str = uuid.toString();
+        if (str.endsWith(STANDARD_SUFFIX)) {
+            String code = str.substring(0, str.length() - STANDARD_SUFFIX.length());
+            if (code.startsWith("0000")) {
+                code = code.substring(4);
+            }
+            return "0x" + code;
+        }
+
+        return str;
+    }
+
+    // https://www.bluetooth.com/specifications/gatt/services
+    public static final UUID SERVICE_BODY_COMPOSITION = fromShortCode(0x181b);
+    public static final UUID SERVICE_DEVICE_INFORMATION = fromShortCode(0x180a);
+    public static final UUID SERVICE_GENERIC_ACCESS = fromShortCode(0x1800);
+    public static final UUID SERVICE_GENERIC_ATTRIBUTE = fromShortCode(0x1801);
+    public static final UUID SERVICE_WEIGHT_SCALE = fromShortCode(0x181d);
+
+    // https://www.bluetooth.com/specifications/gatt/characteristics
+    public static final UUID CHARACTERISTIC_APPEARANCE = fromShortCode(0x2a01);
+    public static final UUID CHARACTERISTIC_BODY_COMPOSITION_MEASUREMENT = fromShortCode(0x2a9c);
+    public static final UUID CHARACTERISTIC_CURRENT_TIME = fromShortCode(0x2a2b);
+    public static final UUID CHARACTERISTIC_DEVICE_NAME = fromShortCode(0x2a00);
+    public static final UUID CHARACTERISTIC_FIRMWARE_REVISION_STRING = fromShortCode(0x2a26);
+    public static final UUID CHARACTERISTIC_HARDWARE_REVISION_STRING = fromShortCode(0x2a27);
+    public static final UUID CHARACTERISTIC_MANUFACTURER_NAME_STRING = fromShortCode(0x2a29);
+    public static final UUID CHARACTERISTIC_MODEL_NUMBER_STRING = fromShortCode(0x2a24);
+    public static final UUID CHARACTERISTIC_PERIPHERAL_PREFERRED_CONNECTION_PARAMETERS = fromShortCode(0x2a04);
+    public static final UUID CHARACTERISTIC_PERIPHERAL_PRIVACY_FLAG = fromShortCode(0x2a02);
+    public static final UUID CHARACTERISTIC_PNP_ID = fromShortCode(0x2a50);
+    public static final UUID CHARACTERISTIC_RECONNECTION_ADDRESS = fromShortCode(0x2a03);
+    public static final UUID CHARACTERISTIC_SERIAL_NUMBER_STRING = fromShortCode(0x2a25);
+    public static final UUID CHARACTERISTIC_SERVICE_CHANGED = fromShortCode(0x2a05);
+    public static final UUID CHARACTERISTIC_SOFTWARE_REVISION_STRING = fromShortCode(0x2a28);
+    public static final UUID CHARACTERISTIC_SYSTEM_ID = fromShortCode(0x2a23);
+    public static final UUID CHARACTERISTIC_WEIGHT_MEASUREMENT = fromShortCode(0x2a9d);
+
+    // https://www.bluetooth.com/specifications/gatt/descriptors
+    public static final UUID DESCRIPTOR_CLIENT_CHARACTERISTIC_CONFIGURATION = fromShortCode(0x2902);
+    public static final UUID DESCRIPTOR_CHARACTERISTIC_USER_DESCRIPTION = fromShortCode(0x2901);
+}

android_app/app/src/test/java/com/health/openscale/BluetoothGattUuidTest.java

@@ -0,0 +1,47 @@
+/* Copyright (C) 2018 Erik Johansson <erik@ejohansson.se>
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.health.openscale;
+
+import com.health.openscale.core.bluetooth.BluetoothGattUuid;
+
+import org.junit.Test;
+
+import java.util.UUID;
+
+import static junit.framework.Assert.assertEquals;
+
+public class BluetoothGattUuidTest {
+
+    @Test
+    public void prettyPrint() throws Exception {
+        assertEquals("GENERIC_ACCESS",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.SERVICE_GENERIC_ACCESS));
+        assertEquals("CURRENT_TIME",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.CHARACTERISTIC_CURRENT_TIME));
+        assertEquals("CLIENT_CHARACTERISTIC_CONFIGURATION",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.DESCRIPTOR_CLIENT_CHARACTERISTIC_CONFIGURATION));
+        assertEquals("GENERIC_ATTRIBUTE",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.fromShortCode(0x1801)));
+        assertEquals("0x0001",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.fromShortCode(0x1)));
+        assertEquals("0x00010000",
+                BluetoothGattUuid.prettyPrint(BluetoothGattUuid.fromShortCode(0x10000)));
+
+        final UUID uuid = UUID.randomUUID();
+        assertEquals(uuid.toString(), BluetoothGattUuid.prettyPrint(uuid));
+    }
+}