POC, decoding works.

.gitignore

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+.idea
+.gradle
+build/

README.md

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-# android-airpods-companion
+# Companion App for AirPods (CAP)
+
+A companion app that adds support for AirPod specific features to Android.
+
+Supported models:
+
+* AirPods Gen1
+* AirPods Gen2
+* AirPods Pro
+
+## Support the project
+
+* Buy the CAP Pro In-App purchase on [Google Play](https://play.google.com/store/apps/details?id=eu.darken.cap)
+* [Buy me a coffee](https://www.buymeacoffee.com/tydarken)
+* Help translate CAP [on Crowdin](https://crowdin.com/project/airpod-companion)
+
+## Download
+
+* [Google Play](https://play.google.com/store/apps/details?id=eu.darken.cap)
+* [GitHub](https://github.com/d4rken/android-airpods-companion/releases/latest)
+
+## Get help
+
+* [Github Issues](https://github.com/d4rken/android-airpods-companion/issues)
+* [Discord](https://discord.gg/vHubYPp)
+
+## Screenshots
+
+## License
+
+CAP's code is available under a GPL v3 license, this excludes:
+
+* CAP icons, logos, mascots and marketing materials.
+* CAP animations and videos.
+* CAP documentation.
+* Google Play store screenshots.
+* Google Play store texts & descriptions.

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'kotlin-kapt'
+    id 'kotlin-parcelize'
+    id 'androidx.navigation.safeargs.kotlin'
+    id 'com.bugsnag.android.gradle'
+    id 'dagger.hilt.android.plugin'
+}
+
+def gitSha = 'git rev-parse --short HEAD'.execute([], project.rootDir).text.trim()
+def buildTime = new Date().format("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone("GMT+1"))
+
+android {
+    def packageName = "eu.darken.cap"
+
+    compileSdkVersion buildConfig.compileSdk
+
+    defaultConfig {
+        applicationId "${packageName}"
+
+        minSdkVersion buildConfig.minSdk
+        targetSdkVersion buildConfig.targetSdk
+
+        versionCode buildConfig.version.code
+        versionName buildConfig.version.name
+
+        testInstrumentationRunner "eu.darken.cap.HiltTestRunner"
+
+        buildConfigField "String", "GITSHA", "\"${gitSha}\""
+        buildConfigField "String", "BUILDTIME", "\"${buildTime}\""
+    }
+
+    signingConfigs {
+        release {}
+    }
+    def signingPropFile = new File(System.properties['user.home'], ".appconfig/${packageName}/signing.properties")
+    if (signingPropFile.canRead()) {
+        Properties signingProps = new Properties()
+        signingProps.load(new FileInputStream(signingPropFile))
+        signingConfigs {
+            release {
+                storeFile new File(signingProps['release.storePath'])
+                keyAlias signingProps['release.keyAlias']
+                storePassword signingProps['release.storePassword']
+                keyPassword signingProps['release.keyPassword']
+            }
+        }
+    }
+
+    buildTypes {
+        def proguardRulesRelease = fileTree(dir: "../proguard", include: ["*.pro"]).asList().toArray()
+        debug {
+            ext.enableBugsnag = false
+            minifyEnabled false
+            shrinkResources false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')
+            proguardFiles proguardRulesRelease
+            proguardFiles 'proguard-rules-debug.pro'
+        }
+        release {
+            signingConfig signingConfigs.release
+            lintOptions {
+                abortOnError true
+                fatal 'StopShip'
+            }
+            ext.enableBugsnag = true
+            minifyEnabled true
+            shrinkResources true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')
+            proguardFiles proguardRulesRelease
+        }
+        applicationVariants.all { variant ->
+            if (variant.buildType.name == "debug") {
+                variant.mergedFlavor.resourceConfigurations.clear()
+                variant.mergedFlavor.resourceConfigurations.add("en")
+                variant.mergedFlavor.resourceConfigurations.add("de")
+            } else if (variant.buildType.name != "debug") {
+                variant.outputs.each { output ->
+                    output.outputFileName = "${packageName}-v" + defaultConfig.versionName + "(" + defaultConfig.versionCode + ")-" + variant.buildType.name.toUpperCase() + "-" + gitSha + ".apk"
+                }
+            }
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    buildFeatures {
+        viewBinding true
+    }
+
+    tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
+        kotlinOptions {
+            jvmTarget = "1.8"
+
+            freeCompilerArgs += [
+                    "-Xuse-experimental=kotlinx.coroutines.ExperimentalCoroutinesApi",
+                    "-Xuse-experimental=kotlinx.coroutines.FlowPreview",
+                    "-Xuse-experimental=kotlin.time.ExperimentalTime",
+                    "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes",
+                    "-Xopt-in=kotlin.RequiresOptIn"
+            ]
+        }
+    }
+
+    testOptions {
+        unitTests.all {
+            useJUnitPlatform()
+        }
+        unitTests {
+            includeAndroidResources = true
+        }
+    }
+
+    sourceSets {
+        test {
+            java.srcDirs += "$projectDir/src/testShared/java"
+        }
+        androidTest {
+            java.srcDirs += "$projectDir/src/testShared/java"
+            androidTest.assets.srcDirs += files("$projectDir/schemas".toString())
+        }
+    }
+}
+
+dependencies {
+    // Kotlin
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:${versions.kotlin.core}"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:${versions.kotlin.coroutines}"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:${versions.kotlin.coroutines}"
+
+    testImplementation "org.jetbrains.kotlin:kotlin-reflect:${versions.kotlin.core}"
+    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:${versions.kotlin.coroutines}"
+    androidTestImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:${versions.kotlin.coroutines}") {
+        // conflicts with mockito due to direct inclusion of byte buddy
+        exclude group: "org.jetbrains.kotlinx", module: "kotlinx-coroutines-debug"
+    }
+
+    // Debugging
+    implementation ('com.bugsnag:bugsnag-android:5.9.2')
+    implementation 'com.getkeepsafe.relinker:relinker:1.4.3'
+
+    // DI
+    implementation "com.google.dagger:dagger:${versions.dagger.core}"
+    implementation "com.google.dagger:dagger-android:${versions.dagger.core}"
+
+    kapt "com.google.dagger:dagger-compiler:${versions.dagger.core}"
+    kapt "com.google.dagger:dagger-android-processor:${versions.dagger.core}"
+
+    implementation "com.google.dagger:hilt-android:${versions.dagger.core}"
+    kapt "com.google.dagger:hilt-android-compiler:${versions.dagger.core}"
+
+    testImplementation "com.google.dagger:hilt-android-testing:${versions.dagger.core}"
+    kaptTest "com.google.dagger:hilt-android-compiler:${versions.dagger.core}"
+
+    androidTestImplementation "com.google.dagger:hilt-android-testing:${versions.dagger.core}"
+    kaptAndroidTest "com.google.dagger:hilt-android-compiler:${versions.dagger.core}"
+
+    kapt "androidx.hilt:hilt-compiler:1.0.0"
+    implementation 'androidx.hilt:hilt-common:1.0.0'
+
+    // Support libs
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.0'
+    implementation 'androidx.annotation:annotation:1.3.0'
+
+    implementation 'androidx.activity:activity-ktx:1.4.0'
+    implementation 'androidx.fragment:fragment-ktx:1.4.0'
+
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-savedstate:2.4.0'
+    implementation 'androidx.lifecycle:lifecycle-common-java8:2.4.0'
+    implementation 'androidx.lifecycle:lifecycle-process:2.4.0'
+    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.4.0'
+
+    implementation "androidx.navigation:navigation-fragment-ktx:2.3.5"
+    implementation "androidx.navigation:navigation-ui-ktx:2.3.5"
+
+    def work_version = "2.7.1"
+    implementation "androidx.work:work-runtime:${work_version}"
+    testImplementation "androidx.work:work-testing:${work_version}"
+    implementation "androidx.work:work-runtime-ktx:${work_version}"
+    implementation 'androidx.hilt:hilt-work:1.0.0'
+
+    // UI
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
+    implementation 'com.google.android.material:material:1.6.0-alpha01'
+
+    // Testing
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation "org.junit.vintage:junit-vintage-engine:5.7.1"
+    testImplementation "androidx.test:core-ktx:1.4.0"
+
+    testImplementation "io.mockk:mockk:1.12.1"
+    androidTestImplementation "io.mockk:mockk-android:1.11.0"
+
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.7.1"
+    testImplementation "org.junit.jupiter:junit-jupiter-api:5.7.1"
+    testImplementation "org.junit.jupiter:junit-jupiter-params:5.7.1"
+
+    androidTestImplementation "androidx.navigation:navigation-testing:2.3.5"
+
+    testImplementation "io.kotest:kotest-runner-junit5:4.6.2"
+    testImplementation "io.kotest:kotest-assertions-core-jvm:4.6.2"
+    testImplementation "io.kotest:kotest-property-jvm:4.6.2"
+    androidTestImplementation "io.kotest:kotest-assertions-core-jvm:4.6.2"
+    androidTestImplementation "io.kotest:kotest-property-jvm:4.6.2"
+
+    testImplementation 'android.arch.core:core-testing:1.1.1'
+    androidTestImplementation 'android.arch.core:core-testing:1.1.1'
+    debugImplementation 'androidx.test:core-ktx:1.4.0'
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    androidTestImplementation 'androidx.test:runner:1.4.0'
+    androidTestImplementation 'androidx.test:rules:1.4.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.4.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.4.0'
+    androidTestImplementation 'androidx.test.espresso.idling:idling-concurrent:3.4.0'
+}

app/proguard-rules-debug.pro

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+-dontobfuscate

app/proguard/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="eu.darken.cap">
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:name="eu.darken.cap.App"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+
+        <activity
+            android:name="eu.darken.cap.main.ui.MainActivity"
+            android:label="@string/app_name"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <receiver
+            android:name="eu.darken.cap.monitor.core.receiver.BluetoothEventReceiver"
+            android:enabled="true"
+            android:exported="true"
+            android:label="Service trigger">
+            <intent-filter>
+                <action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
+                <!--                <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />-->
+                <!--                <action android:name="android.bluetooth.a2dp.profile.action.CONNECTION_STATE_CHANGED" />-->
+                <!--                <action android:name="android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED" />-->
+            </intent-filter>
+        </receiver>
+
+        <service
+            android:name="androidx.work.impl.foreground.SystemForegroundService"
+            android:foregroundServiceType="connectedDevice"
+            tools:node="merge" />
+
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:authorities="${applicationId}.androidx-startup"
+            tools:node="remove"></provider>
+    </application>
+
+</manifest>