diff --git a/host-agent/android/.gitignore b/host-agent/android/.gitignore
new file mode 100644
index 0000000..37f7437
--- /dev/null
+++ b/host-agent/android/.gitignore
@@ -0,0 +1,8 @@
+build/
+.gradle/
+dist/
+*.apk
+local.properties
+.idea/
+*.iml
+captures/
diff --git a/host-agent/android/Dockerfile.build b/host-agent/android/Dockerfile.build
new file mode 100644
index 0000000..fddf045
--- /dev/null
+++ b/host-agent/android/Dockerfile.build
@@ -0,0 +1,32 @@
+# Baut die Android-Agent-APK (Debug, auto-signiert -> direkt installierbar).
+# APK-Builds gehen nur unter Linux — deshalb im Container.
+FROM eclipse-temurin:17-jdk-jammy
+
+ARG GRADLE_VERSION=8.5
+ARG CMDLINE_TOOLS=11076708
+ENV ANDROID_SDK_ROOT=/opt/android-sdk
+ENV ANDROID_HOME=/opt/android-sdk
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        unzip wget ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Gradle
+RUN wget -q https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip -O /tmp/g.zip \
+    && unzip -q /tmp/g.zip -d /opt && rm /tmp/g.zip
+
+# Android cmdline-tools + SDK
+RUN mkdir -p ${ANDROID_SDK_ROOT}/cmdline-tools \
+    && wget -q https://dl.google.com/android/repository/commandlinetools-linux-${CMDLINE_TOOLS}_latest.zip -O /tmp/c.zip \
+    && unzip -q /tmp/c.zip -d ${ANDROID_SDK_ROOT}/cmdline-tools && rm /tmp/c.zip \
+    && mv ${ANDROID_SDK_ROOT}/cmdline-tools/cmdline-tools ${ANDROID_SDK_ROOT}/cmdline-tools/latest
+
+ENV PATH="/opt/gradle-${GRADLE_VERSION}/bin:${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin:${ANDROID_SDK_ROOT}/platform-tools:${PATH}"
+
+RUN yes | sdkmanager --licenses >/dev/null 2>&1 || true
+RUN sdkmanager "platform-tools" "platforms;android-34" "build-tools;34.0.0" >/dev/null 2>&1
+
+WORKDIR /project
+COPY . /project
+
+CMD ["bash","-lc","gradle --no-daemon assembleDebug && cp app/build/outputs/apk/debug/app-debug.apk /out/aria-android-agent.apk && echo 'OK -> /out/aria-android-agent.apk'"]
diff --git a/host-agent/android/app/build.gradle b/host-agent/android/app/build.gradle
new file mode 100644
index 0000000..12bfc70
--- /dev/null
+++ b/host-agent/android/app/build.gradle
@@ -0,0 +1,37 @@
+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'de.hackersoft.ariaagent'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId 'de.hackersoft.ariaagent'
+        minSdk 26
+        targetSdk 33            // 33 vermeidet die Foreground-Service-Typ-Pflicht von 34
+        versionCode 1
+        versionName '0.1.0'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = '17'
+    }
+}
+
+dependencies {
+    implementation 'androidx.core:core-ktx:1.12.0'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.squareup.okhttp3:okhttp:4.12.0'     // RVS-WebSocket
+    implementation 'com.journeyapps:zxing-android-embedded:4.3.0'  // QR-Scan (FOSS, kein Google-Dienst)
+}
diff --git a/host-agent/android/app/src/main/AndroidManifest.xml b/host-agent/android/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..c165528
--- /dev/null
+++ b/host-agent/android/app/src/main/AndroidManifest.xml
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+    <uses-feature android:name="android.hardware.camera" android:required="false" />
+
+    <application
+        android:allowBackup="false"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:usesCleartextTraffic="true"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AppCompat.DayNight">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".AgentService"
+            android:exported="false"
+            android:foregroundServiceType="dataSync" />
+
+        <receiver
+            android:name=".BootReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+    </application>
+</manifest>
diff --git a/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentConfig.kt b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentConfig.kt
new file mode 100644
index 0000000..5bf687a
--- /dev/null
+++ b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentConfig.kt
@@ -0,0 +1,53 @@
+package de.hackersoft.ariaagent
+
+import android.content.Context
+import android.os.Build
+
+/** Verbindungs-/Agent-Einstellungen (in SharedPreferences persistiert). */
+data class AgentConfig(
+    var host: String = "",
+    var port: Int = 443,
+    var tls: Boolean = true,
+    var token: String = "",
+    var name: String = "",
+    var controlEnabled: Boolean = false,
+) {
+    companion object {
+        private const val PREFS = "aria_agent"
+
+        fun load(ctx: Context): AgentConfig {
+            val p = ctx.getSharedPreferences(PREFS, Context.MODE_PRIVATE)
+            return AgentConfig(
+                host = p.getString("host", "") ?: "",
+                port = p.getInt("port", 443),
+                tls = p.getBoolean("tls", true),
+                token = p.getString("token", "") ?: "",
+                name = p.getString("name", "") ?: "",
+                controlEnabled = p.getBoolean("control", false),
+            )
+        }
+    }
+
+    fun save(ctx: Context) {
+        ctx.getSharedPreferences(PREFS, Context.MODE_PRIVATE).edit().apply {
+            putString("host", host)
+            putInt("port", port)
+            putBoolean("tls", tls)
+            putString("token", token)
+            putString("name", name)
+            putBoolean("control", controlEnabled)
+            apply()
+        }
+    }
+
+    fun isValid(): Boolean = host.isNotBlank() && token.isNotBlank()
+
+    fun displayName(): String = if (name.isNotBlank()) name else Build.MODEL
+
+    /** Stabile, technische Host-ID (a-z0-9_-), wie beim Desktop-Agent. */
+    fun hostId(): String {
+        val base = displayName().lowercase()
+            .replace(Regex("[^a-z0-9_-]+"), "-").trim('-')
+        return base.ifBlank { "android" }
+    }
+}
diff --git a/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentService.kt b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentService.kt
new file mode 100644
index 0000000..4908726
--- /dev/null
+++ b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/AgentService.kt
@@ -0,0 +1,100 @@
+package de.hackersoft.ariaagent
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+
+/**
+ * Foreground-Service (Weg A): haelt die RVS-Verbindung dauerhaft, damit ARIA
+ * den Agenten jederzeit erreicht. Persistente Notification + Auto-Reconnect.
+ */
+class AgentService : Service() {
+
+    private var rvs: RvsClient? = null
+
+    companion object {
+        private const val CH = "aria_agent"
+        private const val NOTIF_ID = 1
+        const val ACTION_STATUS = "de.hackersoft.ariaagent.STATUS"
+
+        @Volatile var status: String = "gestoppt"
+        @Volatile var connected: Boolean = false
+
+        fun start(ctx: Context) {
+            val i = Intent(ctx, AgentService::class.java)
+            if (Build.VERSION.SDK_INT >= 26) ctx.startForegroundService(i) else ctx.startService(i)
+        }
+
+        fun stop(ctx: Context) {
+            ctx.stopService(Intent(ctx, AgentService::class.java))
+        }
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        createChannel()
+        startForeground(NOTIF_ID, buildNotification("startet …"))
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        val cfg = AgentConfig.load(this)
+        if (!cfg.isValid()) {
+            stopSelf()
+            return START_NOT_STICKY
+        }
+        rvs?.stop()
+        rvs = RvsClient(applicationContext, cfg) { conn, msg ->
+            connected = conn
+            status = msg
+            updateNotification(msg)
+            sendBroadcast(Intent(ACTION_STATUS).setPackage(packageName))
+        }
+        rvs?.start()
+        return START_STICKY
+    }
+
+    override fun onDestroy() {
+        rvs?.stop()
+        connected = false
+        status = "gestoppt"
+        sendBroadcast(Intent(ACTION_STATUS).setPackage(packageName))
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun createChannel() {
+        if (Build.VERSION.SDK_INT >= 26) {
+            val ch = NotificationChannel(CH, "ARIA Agent", NotificationManager.IMPORTANCE_LOW)
+            ch.setShowBadge(false)
+            (getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager)
+                .createNotificationChannel(ch)
+        }
+    }
+
+    private fun buildNotification(text: String): Notification {
+        val pi = PendingIntent.getActivity(
+            this, 0, Intent(this, MainActivity::class.java),
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+        return NotificationCompat.Builder(this, CH)
+            .setContentTitle("ARIA Host-Agent")
+            .setContentText(text)
+            .setSmallIcon(R.drawable.ic_launcher)
+            .setOngoing(true)
+            .setContentIntent(pi)
+            .build()
+    }
+
+    private fun updateNotification(text: String) {
+        (getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager)
+            .notify(NOTIF_ID, buildNotification(text))
+    }
+}
diff --git a/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/BootReceiver.kt b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/BootReceiver.kt
new file mode 100644
index 0000000..504c439
--- /dev/null
+++ b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/BootReceiver.kt
@@ -0,0 +1,16 @@
+package de.hackersoft.ariaagent
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+
+/** Startet den Agent-Service nach dem Booten wieder (wenn konfiguriert). */
+class BootReceiver : BroadcastReceiver() {
+    override fun onReceive(ctx: Context, intent: Intent) {
+        if (intent.action == Intent.ACTION_BOOT_COMPLETED) {
+            if (AgentConfig.load(ctx).isValid()) {
+                AgentService.start(ctx)
+            }
+        }
+    }
+}
diff --git a/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/MainActivity.kt b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/MainActivity.kt
new file mode 100644
index 0000000..dbd00c2
--- /dev/null
+++ b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/MainActivity.kt
@@ -0,0 +1,145 @@
+package de.hackersoft.ariaagent
+
+import android.Manifest
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.Bundle
+import android.widget.Button
+import android.widget.EditText
+import android.widget.TextView
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.SwitchCompat
+import androidx.core.content.ContextCompat
+import com.journeyapps.barcodescanner.ScanContract
+import com.journeyapps.barcodescanner.ScanOptions
+import org.json.JSONObject
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var host: EditText
+    private lateinit var port: EditText
+    private lateinit var token: EditText
+    private lateinit var name: EditText
+    private lateinit var tls: SwitchCompat
+    private lateinit var control: SwitchCompat
+    private lateinit var statusView: TextView
+
+    private val scan = registerForActivityResult(ScanContract()) { res ->
+        res.contents?.let { applyQr(it) }
+    }
+    private val camPerm = registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+        if (granted) launchScan() else toast("Kamera-Berechtigung nötig für QR-Scan")
+    }
+    private val notifPerm = registerForActivityResult(ActivityResultContracts.RequestPermission()) { }
+
+    private val statusReceiver = object : BroadcastReceiver() {
+        override fun onReceive(c: Context?, i: Intent?) = refreshStatus()
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        host = findViewById(R.id.host)
+        port = findViewById(R.id.port)
+        token = findViewById(R.id.token)
+        name = findViewById(R.id.name)
+        tls = findViewById(R.id.tls)
+        control = findViewById(R.id.control)
+        statusView = findViewById(R.id.status)
+
+        findViewById<Button>(R.id.btnScan).setOnClickListener {
+            if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
+                == PackageManager.PERMISSION_GRANTED) launchScan()
+            else camPerm.launch(Manifest.permission.CAMERA)
+        }
+        findViewById<Button>(R.id.btnConnect).setOnClickListener { saveAndConnect() }
+        findViewById<Button>(R.id.btnStop).setOnClickListener {
+            AgentService.stop(this)
+            refreshStatus()
+        }
+
+        loadIntoUi(AgentConfig.load(this))
+
+        if (Build.VERSION.SDK_INT >= 33 &&
+            ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)
+            != PackageManager.PERMISSION_GRANTED) {
+            notifPerm.launch(Manifest.permission.POST_NOTIFICATIONS)
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        val filter = IntentFilter(AgentService.ACTION_STATUS)
+        ContextCompat.registerReceiver(this, statusReceiver, filter,
+            ContextCompat.RECEIVER_NOT_EXPORTED)
+        refreshStatus()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        try { unregisterReceiver(statusReceiver) } catch (_: Exception) {}
+    }
+
+    private fun launchScan() {
+        val o = ScanOptions()
+            .setBeepEnabled(false)
+            .setOrientationLocked(false)
+            .setPrompt("ARIA-Verbindungs-QR scannen")
+        scan.launch(o)
+    }
+
+    private fun applyQr(content: String) {
+        try {
+            val j = JSONObject(content)
+            host.setText(j.optString("host"))
+            port.setText((if (j.has("port")) j.optInt("port", 443) else 443).toString())
+            token.setText(j.optString("token"))
+            if (j.has("tls")) tls.isChecked = j.optBoolean("tls", true)
+            toast("QR übernommen — jetzt 'Speichern & Verbinden'")
+        } catch (_: Exception) {
+            toast("Das ist kein ARIA-Verbindungs-QR")
+        }
+    }
+
+    private fun loadIntoUi(c: AgentConfig) {
+        host.setText(c.host)
+        port.setText(c.port.toString())
+        token.setText(c.token)
+        name.setText(c.name)
+        tls.isChecked = c.tls
+        control.isChecked = c.controlEnabled
+    }
+
+    private fun saveAndConnect() {
+        val c = AgentConfig(
+            host = host.text.toString().trim(),
+            port = port.text.toString().trim().toIntOrNull() ?: 443,
+            tls = tls.isChecked,
+            token = token.text.toString().trim(),
+            name = name.text.toString().trim(),
+            controlEnabled = control.isChecked,
+        )
+        if (!c.isValid()) {
+            toast("Host und Token sind Pflicht")
+            return
+        }
+        c.save(this)
+        AgentService.start(this)
+        toast("Agent gestartet")
+        refreshStatus()
+    }
+
+    private fun refreshStatus() {
+        val dot = if (AgentService.connected) "🟢" else "🔴"
+        statusView.text = "Status: ${AgentService.status}  $dot"
+    }
+
+    private fun toast(m: String) = Toast.makeText(this, m, Toast.LENGTH_SHORT).show()
+}
diff --git a/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/RvsClient.kt b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/RvsClient.kt
new file mode 100644
index 0000000..f19b0ac
--- /dev/null
+++ b/host-agent/android/app/src/main/java/de/hackersoft/ariaagent/RvsClient.kt
@@ -0,0 +1,159 @@
+package de.hackersoft.ariaagent
+
+import android.content.Context
+import android.os.BatteryManager
+import android.os.Build
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.Response
+import okhttp3.WebSocket
+import okhttp3.WebSocketListener
+import org.json.JSONArray
+import org.json.JSONObject
+import java.util.concurrent.TimeUnit
+
+/**
+ * RVS-WebSocket-Client (Meilenstein 1). Spricht dasselbe Protokoll wie der
+ * Desktop-Agent: meldet sich per host_hello, haelt sich per host_ping frisch,
+ * beantwortet host_command -> host_result.
+ *
+ * M1-Aktionen: nur `info`. screenshot/ui_* folgen in M2/M3.
+ */
+class RvsClient(
+    private val appCtx: Context,
+    private val config: AgentConfig,
+    private val onStatus: (connected: Boolean, msg: String) -> Unit,
+) {
+    private val client = OkHttpClient.Builder()
+        .pingInterval(20, TimeUnit.SECONDS)
+        .readTimeout(0, TimeUnit.MILLISECONDS)   // Server-Push: nie lesen-timeouten
+        .build()
+
+    private var ws: WebSocket? = null
+    @Volatile private var running = false
+    private var pingThread: Thread? = null
+
+    private val caps = listOf("info")   // waechst in M2/M3
+
+    fun start() {
+        running = true
+        connect()
+    }
+
+    fun stop() {
+        running = false
+        pingThread?.interrupt()
+        try { ws?.close(1000, "bye") } catch (_: Exception) {}
+        ws = null
+    }
+
+    private fun url(): String {
+        val proto = if (config.tls) "wss" else "ws"
+        return "$proto://${config.host}:${config.port}?token=${config.token}"
+    }
+
+    private fun connect() {
+        if (!running) return
+        onStatus(false, "verbinde …")
+        val req = Request.Builder().url(url()).build()
+        ws = client.newWebSocket(req, object : WebSocketListener() {
+            override fun onOpen(webSocket: WebSocket, response: Response) {
+                onStatus(true, "verbunden")
+                sendHello(webSocket)
+                startPing(webSocket)
+            }
+            override fun onMessage(webSocket: WebSocket, text: String) {
+                handle(webSocket, text)
+            }
+            override fun onFailure(webSocket: WebSocket, t: Throwable, response: Response?) {
+                onStatus(false, "getrennt: ${t.message ?: "?"}")
+                reconnectLater()
+            }
+            override fun onClosed(webSocket: WebSocket, code: Int, reason: String) {
+                onStatus(false, "geschlossen")
+                reconnectLater()
+            }
+        })
+    }
+
+    private fun reconnectLater() {
+        pingThread?.interrupt()
+        if (!running) return
+        Thread {
+            try { Thread.sleep(3000) } catch (_: InterruptedException) { return@Thread }
+            connect()
+        }.start()
+    }
+
+    private fun send(webSocket: WebSocket, type: String, payload: JSONObject) {
+        val o = JSONObject()
+        o.put("type", type)
+        o.put("payload", payload)
+        o.put("timestamp", System.currentTimeMillis())
+        try { webSocket.send(o.toString()) } catch (_: Exception) {}
+    }
+
+    private fun sendHello(webSocket: WebSocket) {
+        val p = JSONObject()
+        p.put("hostId", config.hostId())
+        p.put("name", config.displayName())
+        p.put("os", "Android ${Build.VERSION.RELEASE} (${Build.MODEL})")
+        p.put("caps", JSONArray(caps))
+        p.put("control", config.controlEnabled)
+        send(webSocket, "host_hello", p)
+    }
+
+    private fun startPing(webSocket: WebSocket) {
+        pingThread?.interrupt()
+        pingThread = Thread {
+            while (running && !Thread.currentThread().isInterrupted) {
+                try { Thread.sleep(25000) } catch (_: InterruptedException) { break }
+                val p = JSONObject().put("hostId", config.hostId())
+                send(webSocket, "host_ping", p)
+                sendHello(webSocket)   // Re-announce (RVS replayt hellos nicht)
+            }
+        }.also { it.start() }
+    }
+
+    private fun handle(webSocket: WebSocket, text: String) {
+        val msg = try { JSONObject(text) } catch (_: Exception) { return }
+        if (msg.optString("type") != "host_command") return
+        val payload = msg.optJSONObject("payload") ?: JSONObject()
+
+        val target = payload.optString("host").ifBlank { payload.optString("hostId") }
+        if (target.isNotBlank()
+            && !target.equals(config.hostId(), true)
+            && !target.equals(config.displayName(), true)) return
+
+        val action = payload.optString("action")
+        val result: JSONObject = when {
+            !config.controlEnabled ->
+                err("Steuerung ist in der Agent-App deaktiviert (Schalter 'Steuerung erlauben').")
+            action == "info" -> doInfo()
+            action in listOf("screenshot", "ui_dump", "ui_tap", "ui_text",
+                             "ui_swipe", "ui_key", "app_launch", "app_list", "notify") ->
+                err("Aktion '$action' kommt in Meilenstein 2/3 (noch nicht implementiert).")
+            else -> err("Aktion '$action' unbekannt.")
+        }
+        result.put("requestId", payload.optString("requestId"))
+        result.put("hostId", config.hostId())
+        result.put("action", action)
+        send(webSocket, "host_result", result)
+    }
+
+    private fun err(m: String): JSONObject = JSONObject().put("ok", false).put("error", m)
+
+    private fun doInfo(): JSONObject {
+        val res = JSONObject()
+        res.put("host", config.displayName())
+        res.put("model", Build.MODEL)
+        res.put("manufacturer", Build.MANUFACTURER)
+        res.put("android", Build.VERSION.RELEASE)
+        res.put("sdk", Build.VERSION.SDK_INT)
+        try {
+            val bm = appCtx.getSystemService(Context.BATTERY_SERVICE) as BatteryManager
+            res.put("battery_percent", bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY))
+        } catch (_: Exception) {}
+        return JSONObject().put("ok", true).put("result", res)
+    }
+}
diff --git a/host-agent/android/app/src/main/res/drawable/ic_launcher.xml b/host-agent/android/app/src/main/res/drawable/ic_launcher.xml
new file mode 100644
index 0000000..5f56ba5
--- /dev/null
+++ b/host-agent/android/app/src/main/res/drawable/ic_launcher.xml
@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#0D0D1A"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#3FFF9F"
+        android:pathData="M54,26 m-26,0 a26,26 0 1,0 52,0 a26,26 0 1,0 -52,0 Z M54,26 m-13,0 a13,13 0 1,1 26,0 a13,13 0 1,1 -26,0 Z" />
+    <path
+        android:fillColor="#3FFF9F"
+        android:pathData="M52,58 h4 v24 h-4 z" />
+</vector>
diff --git a/host-agent/android/app/src/main/res/layout/activity_main.xml b/host-agent/android/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..6edb08d
--- /dev/null
+++ b/host-agent/android/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="true">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="20dp">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/app_name"
+            android:textSize="22sp"
+            android:textStyle="bold"
+            android:paddingBottom="4dp" />
+
+        <TextView
+            android:id="@+id/status"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Status: —"
+            android:paddingBottom="16dp" />
+
+        <Button
+            android:id="@+id/btnScan"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="QR-Code scannen" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="— oder manuell —"
+            android:paddingTop="12dp"
+            android:paddingBottom="4dp" />
+
+        <EditText
+            android:id="@+id/host"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="RVS-Host (z.B. rvs.example.com)"
+            android:inputType="textUri" />
+
+        <EditText
+            android:id="@+id/port"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="Port"
+            android:text="443"
+            android:inputType="number" />
+
+        <EditText
+            android:id="@+id/token"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="RVS-Token"
+            android:inputType="textNoSuggestions" />
+
+        <EditText
+            android:id="@+id/name"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="Anzeigename (optional, z.B. 'Stefans Handy')"
+            android:inputType="text" />
+
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/tls"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="TLS (wss)"
+            android:checked="true"
+            android:paddingTop="12dp" />
+
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/control"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="Steuerung erlauben (Aktionen ausführen)"
+            android:paddingTop="8dp"
+            android:paddingBottom="16dp" />
+
+        <Button
+            android:id="@+id/btnConnect"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="Speichern &amp; Verbinden" />
+
+        <Button
+            android:id="@+id/btnStop"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="Agent stoppen"
+            android:paddingTop="8dp" />
+
+    </LinearLayout>
+</ScrollView>
diff --git a/host-agent/android/app/src/main/res/values/strings.xml b/host-agent/android/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..23a70ef
--- /dev/null
+++ b/host-agent/android/app/src/main/res/values/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">ARIA Host-Agent</string>
+</resources>
diff --git a/host-agent/android/build.gradle b/host-agent/android/build.gradle
new file mode 100644
index 0000000..b704844
--- /dev/null
+++ b/host-agent/android/build.gradle
@@ -0,0 +1,5 @@
+// Root-Build. Plugin-Versionen zentral, in den Modulen nur angewandt.
+plugins {
+    id 'com.android.application' version '8.2.2' apply false
+    id 'org.jetbrains.kotlin.android' version '1.9.22' apply false
+}
diff --git a/host-agent/android/build.sh b/host-agent/android/build.sh
new file mode 100755
index 0000000..bcbcc24
--- /dev/null
+++ b/host-agent/android/build.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Baut die Android-Agent-APK per Docker (Android-SDK + Gradle).
+#   ./build.sh
+# Ergebnis: dist/aria-android-agent.apk  -> aufs Handy kopieren + installieren
+# ("Unbekannte Quellen erlauben").
+set -euo pipefail
+cd "$(dirname "$0")"
+mkdir -p dist
+docker build -f Dockerfile.build -t aria-android-agent-build .
+docker run --rm -v "$(pwd)/dist:/out" aria-android-agent-build
+echo
+echo "Fertig: dist/aria-android-agent.apk"
diff --git a/host-agent/android/gradle.properties b/host-agent/android/gradle.properties
new file mode 100644
index 0000000..fe1b5e0
--- /dev/null
+++ b/host-agent/android/gradle.properties
@@ -0,0 +1,5 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+kotlin.code.style=official
+android.nonTransitiveRClass=true
+org.gradle.caching=true
diff --git a/host-agent/android/settings.gradle b/host-agent/android/settings.gradle
new file mode 100644
index 0000000..25b39f0
--- /dev/null
+++ b/host-agent/android/settings.gradle
@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "aria-android-agent"
+include(":app")