Initial GATT Server Sample

Implement a Time Profile Server using the
Bluetooth GATT APIs.

Change-Id: Iff0816f8921459f655cff6c6dda1292464d3b8a2
Signed-off-by: Dave Smith <[email protected]>

Author: Dave Smith

.gitignore

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+*.iml
+.gradle
+local.properties
+.idea
+.DS_Store
+build

CONTRIBUTING.md

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LICENSE

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README.md

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+Bluetooth GATT Server Sample
+============================
+This application demonstrates accessing the `BluetoothGattServer` Android API
+from within an Android Things application. The sample application advertises
+the [Current Time Service](https://www.bluetooth.com/specifications/gatt/services),
+and implements the server role of the GATT
+[Time Profile](https://www.bluetooth.com/specifications/adopted-specifications).
+
+Pre-requisites
+--------------
+
+- Android Things compatible board
+- Android device running Android 4.3 (API 18) or later
+- Android Studio 2.2+
+
+Getting Started
+---------------
+
+1.  Import the project using Android Studio and deploy it to your board.
+    The sample will automatically enable the Bluetooth radio, start a GATT
+    server, and begin advertising the Current Time Service.
+2.  Install the [Android BluetoothLeGatt client](https://github.com/googlesamples/android-BluetoothLeGatt)
+    sample on your Android mobile device.
+3.  Use the client app to scan and connect to your Android Things board, and
+    inspect the services and characteristics exposed by the GATT server.
+5.  Read the value of the **Current Time** characteristic (`0x2A2B`).
+6.  Register for notifications on the **Current Time** characteristic. The client
+    receives an update once per minute with the latest time.
+7.  Manually [set the time](#setting-the-time) on your board. The time change
+    triggers a notification to the client.
+
+Setting the Time
+----------------
+
+You can set the system clock date/time manually on your Android Things board
+with the `date` shell command over [ADB](https://developer.android.com/studio/command-line/adb.html).
+By default, the command accepts a new date in the `MMddHHmmYYYY.ss` format:
+
+```
+# Reboot ADB into root mode
+$ adb root
+
+# Set the date to 2017/12/13 12:00:00
+$ adb shell date 123112002017.00
+```
+
+Setting the Time Zone
+---------------------
+
+You can set the system time zone manually by updating the `persist.sys.timezone`
+system property over [ADB](https://developer.android.com/studio/command-line/adb.html).
+
+```
+# Reboot ADB into root mode
+$ adb root
+
+# Set the time zone to US Mountain Time
+$ adb shell setprop persist.sys.timezone "America/Denver"
+```
+
+License
+-------
+
+Copyright 2017 The Android Open Source Project, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License.  You may obtain a copy of
+the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+License for the specific language governing permissions and limitations under
+the License.

app/.gitignore

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+/build

app/build.gradle

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+/*
+ * Copyright 2017, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
+    defaultConfig {
+        applicationId "com.example.androidthings.gattserver"
+        minSdkVersion 24
+        targetSdkVersion 25
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/smithdave/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile