Add Android BLE mesh client and project website

android/app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "com.schoolmesh.messenger"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.schoolmesh.messenger"
+        minSdk = 26
+        targetSdk = 34
+        versionCode = 2
+        versionName = "0.1.1"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.appcompat:appcompat:1.7.0")
+    implementation("com.google.android.material:material:1.12.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+}

android/app/proguard-rules.pro

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+# Project specific ProGuard rules go here.

android/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">
+
+    <uses-feature
+        android:name="android.hardware.bluetooth_le"
+        android:required="false" />
+
+    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="30" />
+    <uses-permission
+        android:name="android.permission.BLUETOOTH_SCAN"
+        android:usesPermissionFlags="neverForLocation" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@android:drawable/sym_def_app_icon"
+        android:label="@string/app_name"
+        android:roundIcon="@android:drawable/sym_def_app_icon"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.SchoolMeshMessenger">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".mesh.MeshForegroundService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="connectedDevice" />
+    </application>
+
+</manifest>

android/app/src/main/java/com/schoolmesh/messenger/MainActivity.kt

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+package com.schoolmesh.messenger
+
+import android.Manifest
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.Build
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import com.schoolmesh.messenger.mesh.MeshForegroundService
+import com.schoolmesh.messenger.mesh.MeshServiceContract
+
+class MainActivity : AppCompatActivity() {
+    private lateinit var statusText: TextView
+    private lateinit var peersText: TextView
+    private lateinit var logsText: TextView
+
+    private val peers = linkedSetOf<String>()
+    private val logs = ArrayDeque<String>()
+
+    private val meshEventReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context?, intent: Intent?) {
+            if (intent?.action != MeshServiceContract.ACTION_EVENT) return
+            val eventType = intent.getStringExtra(MeshServiceContract.EXTRA_EVENT_TYPE) ?: return
+            val value = intent.getStringExtra(MeshServiceContract.EXTRA_EVENT_VALUE) ?: return
+
+            when (eventType) {
+                MeshServiceContract.EVENT_STATUS -> updateStatus(value)
+                MeshServiceContract.EVENT_PEER -> addPeer(value)
+                MeshServiceContract.EVENT_LOG -> appendLog(value)
+            }
+        }
+    }
+
+    private val permissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestMultiplePermissions()
+    ) { result ->
+        val allGranted = result.values.all { it }
+        if (allGranted) {
+            startMesh()
+        } else {
+            updateStatus("Нет BLE-разрешений")
+            appendLog("Permissions denied by user")
+            Toast.makeText(this, "Разрешения отклонены", Toast.LENGTH_SHORT).show()
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        statusText = findViewById(R.id.statusText)
+        peersText = findViewById(R.id.peersText)
+        logsText = findViewById(R.id.logsText)
+
+        findViewById<Button>(R.id.btnStartMesh).setOnClickListener {
+            ensurePermissionsAndStart()
+        }
+        findViewById<Button>(R.id.btnStopMesh).setOnClickListener {
+            MeshForegroundService.stop(this)
+            updateStatus("Mesh остановлен")
+            appendLog("Mesh service stop requested")
+        }
+
+        renderPeers()
+        renderLogs()
+    }
+
+    override fun onStart() {
+        super.onStart()
+        registerMeshReceiver()
+    }
+
+    override fun onStop() {
+        unregisterReceiver(meshEventReceiver)
+        super.onStop()
+    }
+
+    private fun registerMeshReceiver() {
+        val filter = IntentFilter(MeshServiceContract.ACTION_EVENT)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            registerReceiver(meshEventReceiver, filter, RECEIVER_NOT_EXPORTED)
+        } else {
+            @Suppress("DEPRECATION")
+            registerReceiver(meshEventReceiver, filter)
+        }
+    }
+
+    private fun ensurePermissionsAndStart() {
+        val missing = requiredPermissions().filter { permission ->
+            ContextCompat.checkSelfPermission(this, permission) != android.content.pm.PackageManager.PERMISSION_GRANTED
+        }
+        if (missing.isEmpty()) {
+            startMesh()
+        } else {
+            permissionLauncher.launch(missing.toTypedArray())
+        }
+    }
+
+    private fun requiredPermissions(): List<String> {
+        val permissions = mutableListOf<String>()
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            permissions += Manifest.permission.BLUETOOTH_SCAN
+            permissions += Manifest.permission.BLUETOOTH_CONNECT
+            permissions += Manifest.permission.BLUETOOTH_ADVERTISE
+        } else {
+            permissions += Manifest.permission.ACCESS_FINE_LOCATION
+        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            permissions += Manifest.permission.POST_NOTIFICATIONS
+        }
+        return permissions
+    }
+
+    private fun startMesh() {
+        MeshForegroundService.start(this)
+        updateStatus("Запуск foreground service")
+        appendLog("Mesh service start requested")
+        Toast.makeText(this, "Mesh запускается", Toast.LENGTH_SHORT).show()
+    }
+
+    private fun updateStatus(text: String) {
+        statusText.text = text
+    }
+
+    private fun addPeer(address: String) {
+        if (peers.add(address)) {
+            renderPeers()
+        }
+    }
+
+    private fun appendLog(message: String) {
+        if (logs.size >= MAX_LOG_ENTRIES) {
+            logs.removeFirst()
+        }
+        logs.addLast(message)
+        renderLogs()
+    }
+
+    private fun renderPeers() {
+        peersText.text = if (peers.isEmpty()) {
+            "Узлы не найдены"
+        } else {
+            peers.joinToString(separator = "\n")
+        }
+    }
+
+    private fun renderLogs() {
+        logsText.text = if (logs.isEmpty()) {
+            "Лог пуст"
+        } else {
+            logs.joinToString(separator = "\n")
+        }
+    }
+
+    companion object {
+        private const val MAX_LOG_ENTRIES = 20
+    }
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/BleMeshManager.kt

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+package com.schoolmesh.messenger.mesh
+
+import android.Manifest
+import android.annotation.SuppressLint
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothDevice
+import android.bluetooth.BluetoothGatt
+import android.bluetooth.BluetoothGattCallback
+import android.bluetooth.BluetoothGattCharacteristic
+import android.bluetooth.BluetoothProfile
+import android.bluetooth.BluetoothGattServer
+import android.bluetooth.BluetoothGattServerCallback
+import android.bluetooth.BluetoothGattService
+import android.bluetooth.BluetoothManager
+import android.bluetooth.le.AdvertiseCallback
+import android.bluetooth.le.AdvertiseData
+import android.bluetooth.le.AdvertiseSettings
+import android.bluetooth.le.BluetoothLeAdvertiser
+import android.bluetooth.le.BluetoothLeScanner
+import android.bluetooth.le.ScanCallback
+import android.bluetooth.le.ScanFilter
+import android.bluetooth.le.ScanResult
+import android.bluetooth.le.ScanSettings
+import android.content.Context
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.ParcelUuid
+import android.util.Log
+import androidx.core.content.ContextCompat
+import java.nio.charset.StandardCharsets
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
+
+class BleMeshManager(
+    private val context: Context,
+    private val onPeerDiscovered: (String) -> Unit = {},
+    private val onStatusChanged: (String) -> Unit = {},
+    private val onError: (String) -> Unit = {},
+    private val onLog: (String) -> Unit = {},
+    private val seenPacketCache: SeenPacketCache = SeenPacketCache()
+) {
+    private val bluetoothManager = context.getSystemService(BluetoothManager::class.java)
+    private val bluetoothAdapter = bluetoothManager?.adapter
+    private val scanner: BluetoothLeScanner?
+        get() = bluetoothAdapter?.bluetoothLeScanner
+    private val advertiser: BluetoothLeAdvertiser?
+        get() = bluetoothAdapter?.bluetoothLeAdvertiser
+
+    private val activeConnections = ConcurrentHashMap<String, BluetoothGatt>()
+    private var gattServer: BluetoothGattServer? = null
+    private var inboundCharacteristic: BluetoothGattCharacteristic? = null
+    private var isRunning = false
+
+    private val localNodeId: String by lazy {
+        bluetoothAdapter?.address ?: "android-${UUID.randomUUID()}"
+    }
+
+    private val scanCallback = object : ScanCallback() {
+        override fun onScanResult(callbackType: Int, result: ScanResult) {
+            val device = result.device ?: return
+            val address = device.address ?: return
+            onPeerDiscovered(address)
+            if (address == localNodeId || activeConnections.containsKey(address)) {
+                return
+            }
+            log("Discovered BLE node: $address")
+            connectToPeer(device)
+        }
+
+        override fun onScanFailed(errorCode: Int) {
+            fail("BLE scan failed: $errorCode")
+        }
+    }
+
+    private val advertiseCallback = object : AdvertiseCallback() {
+        override fun onStartSuccess(settingsInEffect: AdvertiseSettings) {
+            log("BLE advertising started")
+        }
+
+        override fun onStartFailure(errorCode: Int) {
+            fail("BLE advertising failed: $errorCode")
+        }
+    }
+
+    private val gattServerCallback = object : BluetoothGattServerCallback() {
+        override fun onConnectionStateChange(device: BluetoothDevice, status: Int, newState: Int) {
+            log("GATT server connection ${device.address}: state=$newState status=$status")
+        }
+
+        override fun onCharacteristicWriteRequest(
+            device: BluetoothDevice,
+            requestId: Int,
+            characteristic: BluetoothGattCharacteristic,
+            preparedWrite: Boolean,
+            responseNeeded: Boolean,
+            offset: Int,
+            value: ByteArray
+        ) {
+            if (characteristic.uuid != CHARACTERISTIC_PACKET_UUID) {
+                if (responseNeeded) {
+                    gattServer?.sendResponse(device, requestId, BluetoothGatt.GATT_FAILURE, offset, null)
+                }
+                return
+            }
+
+            val rawPacket = value.toString(StandardCharsets.UTF_8)
+            log("Packet received from ${device.address}: $rawPacket")
+            handleIncomingPacket(rawPacket)
+
+            if (responseNeeded) {
+                gattServer?.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, null)
+            }
+        }
+    }
+
+    private inner class MeshGattCallback(
+        private val device: BluetoothDevice
+    ) : BluetoothGattCallback() {
+        override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
+            val address = device.address ?: return
+            if (status != BluetoothGatt.GATT_SUCCESS) {
+                log("GATT client error for $address: status=$status")
+                closeConnection(address)
+                return
+            }
+
+            when (newState) {
+                BluetoothProfile.STATE_CONNECTED -> {
+                    log("Connected to peer $address")
+                    activeConnections[address] = gatt
+                    gatt.discoverServices()
+                }
+
+                BluetoothProfile.STATE_DISCONNECTED -> {
+                    log("Disconnected from peer $address")
+                    closeConnection(address)
+                }
+            }
+        }
+
+        override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
+            if (status != BluetoothGatt.GATT_SUCCESS) {
+                log("Service discovery failed for ${device.address}: $status")
+                return
+            }
+            log("Services discovered for ${device.address}")
+            sendPresence(gatt)
+        }
+
+        override fun onCharacteristicWrite(
+            gatt: BluetoothGatt,
+            characteristic: BluetoothGattCharacteristic,
+            status: Int
+        ) {
+            val address = device.address ?: return
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                log("Packet sent to $address")
+            } else {
+                log("Packet send failed to $address: status=$status")
+            }
+        }
+    }
+
+    fun onPacketReceived(packet: MeshPacket): MeshAction {
+        val isNew = seenPacketCache.markSeen(packet.messageId)
+        if (!isNew) {
+            return MeshAction.DropDuplicate
+        }
+
+        if (packet.isExpired()) {
+            return MeshAction.DropExpired
+        }
+
+        return when (packet.type) {
+            PacketType.ACK -> MeshAction.ConsumeAck(packet.messageId)
+            PacketType.PRESENCE -> MeshAction.ConsumePresence(packet.senderId)
+            PacketType.MESSAGE -> MeshAction.ProcessAndRelay(packet.decrementedTtl())
+        }
+    }
+
+    fun start() {
+        if (isRunning) return
+        if (!hasRequiredRuntimePermissions()) {
+            fail("BLE permissions are missing")
+            return
+        }
+
+        val adapter = bluetoothAdapter
+        if (adapter == null || !adapter.isEnabled) {
+            fail("Bluetooth adapter is unavailable or disabled")
+            return
+        }
+
+        startGattServer()
+        startScanning()
+        startAdvertising()
+        isRunning = true
+        onStatusChanged("Mesh активен, идет discovery и GATT transport")
+        log("BLE mesh manager started with nodeId=$localNodeId")
+    }
+
+    fun stop() {
+        if (!isRunning) return
+
+        runCatching { scanner?.stopScan(scanCallback) }
+            .onFailure { Log.w(TAG, "Failed to stop scan", it) }
+        runCatching { advertiser?.stopAdvertising(advertiseCallback) }
+            .onFailure { Log.w(TAG, "Failed to stop advertising", it) }
+        runCatching { gattServer?.close() }
+            .onFailure { Log.w(TAG, "Failed to close GATT server", it) }
+
+        activeConnections.keys.toList().forEach(::closeConnection)
+        inboundCharacteristic = null
+        gattServer = null
+        isRunning = false
+        onStatusChanged("Mesh остановлен")
+        log("BLE mesh manager stopped")
+    }
+
+    private fun handleIncomingPacket(rawPacket: String) {
+        val packet = runCatching { MeshPacketCodec.decode(rawPacket) }
+            .getOrElse {
+                fail("Packet decode failed: ${it.message}")
+                return
+            }
+
+        when (val action = onPacketReceived(packet)) {
+            MeshAction.DropDuplicate -> log("Duplicate packet dropped: ${packet.messageId}")
+            MeshAction.DropExpired -> log("Expired packet dropped: ${packet.messageId}")
+            is MeshAction.ConsumeAck -> log("ACK consumed: ${action.messageId}")
+            is MeshAction.ConsumePresence -> {
+                onPeerDiscovered(action.senderId)
+                onStatusChanged("Presence from ${action.senderId}")
+                log("Presence consumed from ${action.senderId}")
+            }
+
+            is MeshAction.ProcessAndRelay -> {
+                onStatusChanged("Message from ${packet.senderId}")
+                log("Relaying packet ${packet.messageId}")
+                broadcastPacket(action.packetToRelay)
+                sendAck(packet)
+            }
+        }
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun startGattServer() {
+        val manager = bluetoothManager ?: run {
+            fail("BluetoothManager unavailable")
+            return
+        }
+
+        val server = manager.openGattServer(context, gattServerCallback)
+        if (server == null) {
+            fail("Failed to open GATT server")
+            return
+        }
+
+        val characteristic = BluetoothGattCharacteristic(
+            CHARACTERISTIC_PACKET_UUID,
+            BluetoothGattCharacteristic.PROPERTY_WRITE or BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE,
+            BluetoothGattCharacteristic.PERMISSION_WRITE
+        )
+
+        val service = BluetoothGattService(
+            MESH_SERVICE_UUID,
+            BluetoothGattService.SERVICE_TYPE_PRIMARY
+        ).apply {
+            addCharacteristic(characteristic)
+        }
+
+        server.addService(service)
+        gattServer = server
+        inboundCharacteristic = characteristic
+        log("GATT server started")
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun startScanning() {
+        val filter = ScanFilter.Builder()
+            .setServiceUuid(ParcelUuid(MESH_SERVICE_UUID))
+            .build()
+        val settings = ScanSettings.Builder()
+            .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
+            .build()
+        scanner?.startScan(listOf(filter), settings, scanCallback)
+        log("BLE scanning started")
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun startAdvertising() {
+        val settings = AdvertiseSettings.Builder()
+            .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_LATENCY)
+            .setConnectable(true)
+            .setTimeout(0)
+            .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH)
+            .build()
+
+        val data = AdvertiseData.Builder()
+            .setIncludeDeviceName(false)
+            .addServiceUuid(ParcelUuid(MESH_SERVICE_UUID))
+            .build()
+
+        advertiser?.startAdvertising(settings, data, advertiseCallback)
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun connectToPeer(device: BluetoothDevice) {
+        val address = device.address ?: return
+        if (activeConnections.containsKey(address)) return
+        log("Connecting to peer $address")
+        val gatt = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            device.connectGatt(context, false, MeshGattCallback(device), BluetoothDevice.TRANSPORT_LE)
+        } else {
+            @Suppress("DEPRECATION")
+            device.connectGatt(context, false, MeshGattCallback(device))
+        }
+        if (gatt != null) {
+            activeConnections[address] = gatt
+        }
+    }
+
+    private fun sendPresence(gatt: BluetoothGatt) {
+        val packet = MeshPacket(
+            senderId = localNodeId,
+            targetId = gatt.device.address ?: "broadcast",
+            type = PacketType.PRESENCE,
+            payload = "presence:$localNodeId"
+        )
+        writePacket(gatt, packet)
+    }
+
+    private fun sendAck(packet: MeshPacket) {
+        val ack = MeshPacket(
+            senderId = localNodeId,
+            targetId = packet.senderId,
+            type = PacketType.ACK,
+            payload = packet.messageId
+        )
+        broadcastPacket(ack)
+    }
+
+    private fun broadcastPacket(packet: MeshPacket) {
+        activeConnections.values.forEach { gatt ->
+            writePacket(gatt, packet)
+        }
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun writePacket(gatt: BluetoothGatt, packet: MeshPacket) {
+        val characteristic = gatt
+            .getService(MESH_SERVICE_UUID)
+            ?.getCharacteristic(CHARACTERISTIC_PACKET_UUID)
+
+        if (characteristic == null) {
+            log("Remote characteristic missing on ${gatt.device.address}")
+            return
+        }
+
+        val payload = MeshPacketCodec.encode(packet).toByteArray(StandardCharsets.UTF_8)
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            gatt.writeCharacteristic(
+                characteristic,
+                payload,
+                BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT
+            )
+        } else {
+            @Suppress("DEPRECATION")
+            characteristic.writeType = BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT
+            @Suppress("DEPRECATION")
+            characteristic.value = payload
+            @Suppress("DEPRECATION")
+            gatt.writeCharacteristic(characteristic)
+        }
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun closeConnection(address: String) {
+        val gatt = activeConnections.remove(address) ?: return
+        runCatching {
+            gatt.disconnect()
+            gatt.close()
+        }.onFailure {
+            Log.w(TAG, "Failed to close connection for $address", it)
+        }
+    }
+
+    private fun hasRequiredRuntimePermissions(): Boolean {
+        val requiredPermissions = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            listOf(
+                Manifest.permission.BLUETOOTH_SCAN,
+                Manifest.permission.BLUETOOTH_CONNECT,
+                Manifest.permission.BLUETOOTH_ADVERTISE
+            )
+        } else {
+            listOf(Manifest.permission.ACCESS_FINE_LOCATION)
+        }
+
+        return requiredPermissions.all { permission ->
+            ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED
+        }
+    }
+
+    private fun fail(message: String) {
+        Log.e(TAG, message)
+        onError(message)
+        onLog(message)
+    }
+
+    private fun log(message: String) {
+        Log.d(TAG, message)
+        onLog(message)
+    }
+
+    companion object {
+        private const val TAG = "BleMeshManager"
+        private val MESH_SERVICE_UUID: UUID = UUID.fromString("8fa8f9f0-e755-4c1d-9ac2-4f0a02e07f8b")
+        private val CHARACTERISTIC_PACKET_UUID: UUID =
+            UUID.fromString("f9629b10-9d60-4d95-bc6a-6fdb4d4f5a4a")
+    }
+}
+
+sealed interface MeshAction {
+    data object DropDuplicate : MeshAction
+    data object DropExpired : MeshAction
+    data class ConsumeAck(val messageId: String) : MeshAction
+    data class ConsumePresence(val senderId: String) : MeshAction
+    data class ProcessAndRelay(val packetToRelay: MeshPacket) : MeshAction
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/MeshForegroundService.kt

@@ -0,0 +1,119 @@
+package com.schoolmesh.messenger.mesh
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+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
+import com.schoolmesh.messenger.R
+
+class MeshForegroundService : Service() {
+    private lateinit var bleMeshManager: BleMeshManager
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel()
+        bleMeshManager = BleMeshManager(
+            context = applicationContext,
+            onPeerDiscovered = { address ->
+                sendEvent(MeshServiceContract.EVENT_PEER, address)
+                sendEvent(MeshServiceContract.EVENT_LOG, "Peer discovered: $address")
+            },
+            onStatusChanged = { status ->
+                sendEvent(MeshServiceContract.EVENT_STATUS, status)
+                updateNotification(status)
+            },
+            onError = { message ->
+                sendEvent(MeshServiceContract.EVENT_STATUS, "Ошибка: $message")
+                sendEvent(MeshServiceContract.EVENT_LOG, "Error: $message")
+                updateNotification("Ошибка mesh")
+            },
+            onLog = { message ->
+                sendEvent(MeshServiceContract.EVENT_LOG, message)
+            }
+        )
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        when (intent?.action) {
+            MeshServiceContract.ACTION_STOP -> stopMesh()
+            else -> startMesh()
+        }
+        return START_STICKY
+    }
+
+    override fun onDestroy() {
+        bleMeshManager.stop()
+        super.onDestroy()
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun startMesh() {
+        startForeground(NOTIFICATION_ID, buildNotification("Mesh запускается"))
+        bleMeshManager.start()
+    }
+
+    private fun stopMesh() {
+        bleMeshManager.stop()
+        stopForeground(STOP_FOREGROUND_REMOVE)
+        stopSelf()
+    }
+
+    private fun buildNotification(contentText: String): Notification {
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle(getString(R.string.notification_title))
+            .setContentText(contentText)
+            .setSmallIcon(android.R.drawable.stat_sys_data_bluetooth)
+            .setOngoing(true)
+            .build()
+    }
+
+    private fun updateNotification(contentText: String) {
+        val notificationManager = getSystemService(NotificationManager::class.java)
+        notificationManager.notify(NOTIFICATION_ID, buildNotification(contentText))
+    }
+
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) return
+        val manager = getSystemService(NotificationManager::class.java)
+        val channel = NotificationChannel(
+            CHANNEL_ID,
+            getString(R.string.notification_channel_name),
+            NotificationManager.IMPORTANCE_LOW
+        )
+        manager.createNotificationChannel(channel)
+    }
+
+    private fun sendEvent(type: String, value: String) {
+        sendBroadcast(
+            Intent(MeshServiceContract.ACTION_EVENT)
+                .setPackage(packageName)
+                .putExtra(MeshServiceContract.EXTRA_EVENT_TYPE, type)
+                .putExtra(MeshServiceContract.EXTRA_EVENT_VALUE, value)
+        )
+    }
+
+    companion object {
+        private const val CHANNEL_ID = "mesh_status"
+        private const val NOTIFICATION_ID = 1001
+
+        fun start(context: Context) {
+            val intent = Intent(context, MeshForegroundService::class.java).apply {
+                action = MeshServiceContract.ACTION_START
+            }
+            androidx.core.content.ContextCompat.startForegroundService(context, intent)
+        }
+
+        fun stop(context: Context) {
+            val intent = Intent(context, MeshForegroundService::class.java).apply {
+                action = MeshServiceContract.ACTION_STOP
+            }
+            context.startService(intent)
+        }
+    }
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/MeshPacket.kt

@@ -0,0 +1,21 @@
+package com.schoolmesh.messenger.mesh
+
+import java.util.UUID
+
+data class MeshPacket(
+    val messageId: String = UUID.randomUUID().toString(),
+    val senderId: String,
+    val targetId: String,
+    val ttl: Int = DEFAULT_TTL,
+    val timestamp: Long = System.currentTimeMillis(),
+    val type: PacketType,
+    val payload: String
+) {
+    fun isExpired(): Boolean = ttl <= 0
+
+    fun decrementedTtl(): MeshPacket = copy(ttl = ttl - 1)
+
+    companion object {
+        const val DEFAULT_TTL = 6
+    }
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/MeshPacketCodec.kt

@@ -0,0 +1,30 @@
+package com.schoolmesh.messenger.mesh
+
+import org.json.JSONObject
+
+object MeshPacketCodec {
+    fun encode(packet: MeshPacket): String {
+        return JSONObject()
+            .put("messageId", packet.messageId)
+            .put("senderId", packet.senderId)
+            .put("targetId", packet.targetId)
+            .put("ttl", packet.ttl)
+            .put("timestamp", packet.timestamp)
+            .put("type", packet.type.name)
+            .put("payload", packet.payload)
+            .toString()
+    }
+
+    fun decode(raw: String): MeshPacket {
+        val json = JSONObject(raw)
+        return MeshPacket(
+            messageId = json.getString("messageId"),
+            senderId = json.getString("senderId"),
+            targetId = json.getString("targetId"),
+            ttl = json.getInt("ttl"),
+            timestamp = json.getLong("timestamp"),
+            type = PacketType.valueOf(json.getString("type")),
+            payload = json.getString("payload")
+        )
+    }
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/MeshServiceContract.kt

@@ -0,0 +1,14 @@
+package com.schoolmesh.messenger.mesh
+
+object MeshServiceContract {
+    const val ACTION_START = "com.schoolmesh.messenger.mesh.START"
+    const val ACTION_STOP = "com.schoolmesh.messenger.mesh.STOP"
+    const val ACTION_EVENT = "com.schoolmesh.messenger.mesh.EVENT"
+
+    const val EXTRA_EVENT_TYPE = "event_type"
+    const val EXTRA_EVENT_VALUE = "event_value"
+
+    const val EVENT_STATUS = "status"
+    const val EVENT_PEER = "peer"
+    const val EVENT_LOG = "log"
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/PacketType.kt

@@ -0,0 +1,7 @@
+package com.schoolmesh.messenger.mesh
+
+enum class PacketType {
+    MESSAGE,
+    ACK,
+    PRESENCE
+}

android/app/src/main/java/com/schoolmesh/messenger/mesh/SeenPacketCache.kt

@@ -0,0 +1,21 @@
+package com.schoolmesh.messenger.mesh
+
+class SeenPacketCache(
+    private val maxSize: Int = 512
+) {
+    private val packetIds = LinkedHashSet<String>()
+
+    @Synchronized
+    fun markSeen(packetId: String): Boolean {
+        if (packetIds.contains(packetId)) return false
+
+        packetIds.add(packetId)
+        if (packetIds.size > maxSize) {
+            val oldest = packetIds.firstOrNull()
+            if (oldest != null) {
+                packetIds.remove(oldest)
+            }
+        }
+        return true
+    }
+}

android/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="24dp">
+
+        <TextView
+            android:id="@+id/titleText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="School Mesh Messenger"
+            android:textAppearance="@style/TextAppearance.Material3.HeadlineMedium" />
+
+        <TextView
+            android:id="@+id/subtitleText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="Debug-экран BLE mesh: foreground service, найденные узлы и журнал событий." />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:orientation="horizontal">
+
+            <Button
+                android:id="@+id/btnStartMesh"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:text="Запустить mesh" />
+
+            <Button
+                android:id="@+id/btnStopMesh"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="12dp"
+                android:layout_weight="1"
+                android:text="Остановить mesh" />
+        </LinearLayout>
+
+        <TextView
+            android:id="@+id/statusLabel"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="Статус"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/statusText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="Ожидание запуска" />
+
+        <TextView
+            android:id="@+id/peersLabel"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="Найденные узлы"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/peersText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:background="#EAF3F7"
+            android:padding="12dp"
+            android:text="Узлы не найдены" />
+
+        <TextView
+            android:id="@+id/logsLabel"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="Журнал событий"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/logsText"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:background="#101820"
+            android:padding="12dp"
+            android:text="Лог пуст"
+            android:textColor="#EAF7F2"
+            android:textIsSelectable="true" />
+    </LinearLayout>
+</ScrollView>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,5 @@
+<resources>
+    <color name="teal_primary">#1E6E54</color>
+    <color name="teal_container">#A4F3D5</color>
+    <color name="blue_secondary">#1150B4</color>
+</resources>

android/app/src/main/res/values/strings.xml

@@ -0,0 +1,5 @@
+<resources>
+    <string name="app_name">School Mesh Messenger</string>
+    <string name="notification_title">School Mesh Messenger</string>
+    <string name="notification_channel_name">Mesh status</string>
+</resources>

android/app/src/main/res/values/themes.xml

@@ -0,0 +1,7 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <style name="Theme.SchoolMeshMessenger" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="colorPrimary">#1E6E54</item>
+        <item name="colorPrimaryContainer">#A4F3D5</item>
+        <item name="colorSecondary">#1150B4</item>
+    </style>
+</resources>

android/app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content />

android/app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<data-extraction-rules />

android/build.gradle.kts

@@ -0,0 +1,4 @@
+plugins {
+    id("com.android.application") version "8.4.2" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.24" apply false
+}

android/gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+kotlin.code.style=official

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

android/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# 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
+#
+#      https://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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

android/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

android/settings.gradle.kts

@@ -0,0 +1,18 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "SchoolMeshMessenger"
+include(":app")

website/assets/css/styles.css

@@ -0,0 +1,32 @@
+:root {
+  --mesh-dark: #0f2a43;
+  --mesh-accent: #1f8a70;
+  --mesh-bg: #f4f8fb;
+  --mesh-text: #1d2630;
+}
+
+body {
+  background: radial-gradient(circle at top right, #d7f6eb 0%, #f4f8fb 40%, #eef3fa 100%);
+  color: var(--mesh-text);
+}
+
+.hero {
+  color: #fff;
+  background: linear-gradient(135deg, var(--mesh-dark), #144c72 50%, #196b95);
+}
+
+.status-card {
+  background: rgba(255, 255, 255, 0.14);
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  backdrop-filter: blur(8px);
+}
+
+.feature {
+  background: #fff;
+  border: 1px solid #dbe4ef;
+  height: 100%;
+}
+
+footer {
+  border-top: 1px solid #dbe4ef;
+}

website/assets/js/app.js

@@ -0,0 +1,50 @@
+document.addEventListener('DOMContentLoaded', () => {
+  const btn = document.getElementById('downloadBtn');
+  const versionBadge = document.getElementById('versionBadge');
+  const versionSummary = document.getElementById('versionSummary');
+  const downloadMeta = document.getElementById('downloadMeta');
+  if (!btn) return;
+
+  btn.addEventListener('click', (event) => {
+    if (!btn.getAttribute('href') || btn.getAttribute('href') === '#') {
+      event.preventDefault();
+      alert('APK пока не опубликован. Следите за обновлениями проекта.');
+    }
+  });
+
+  fetch('assets/meta/version.json', { cache: 'no-store' })
+    .then((response) => {
+      if (!response.ok) {
+        throw new Error(`HTTP ${response.status}`);
+      }
+      return response.json();
+    })
+    .then((meta) => {
+      const sizeMb = (meta.apkSizeBytes / (1024 * 1024)).toFixed(1);
+      const builtAt = new Date(meta.buildDateUtc).toLocaleString('ru-RU', {
+        dateStyle: 'medium',
+        timeStyle: 'short'
+      });
+
+      if (versionBadge) {
+        versionBadge.textContent = `v${meta.versionName} (${meta.versionCode})`;
+      }
+      if (versionSummary) {
+        versionSummary.textContent = `Последняя сборка опубликована ${builtAt} UTC.`;
+      }
+      if (downloadMeta) {
+        downloadMeta.textContent = `Доступна debug-сборка v${meta.versionName}. Размер APK: ${sizeMb} MB.`;
+      }
+      if (meta.apkPath) {
+        btn.setAttribute('href', meta.apkPath);
+      }
+    })
+    .catch(() => {
+      if (versionBadge) {
+        versionBadge.textContent = 'Версия недоступна';
+      }
+      if (versionSummary) {
+        versionSummary.textContent = 'Не удалось загрузить метаданные сборки.';
+      }
+    });
+});

website/index.html

@@ -0,0 +1,65 @@
+<!doctype html>
+<html lang="ru">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>School Mesh Messenger</title>
+  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css" rel="stylesheet" />
+  <link href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.css" rel="stylesheet" />
+  <link href="assets/css/styles.css" rel="stylesheet" />
+</head>
+<body>
+  <header class="hero py-5">
+    <div class="container">
+      <div class="row align-items-center g-4">
+        <div class="col-lg-8">
+          <h1 class="display-5 fw-bold mb-3">School Mesh Messenger</h1>
+          <p class="lead mb-4">Офлайн-мессенджер для школы на базе BLE mesh-сети: связь между учениками и учителями без интернета.</p>
+          <div class="d-flex gap-2 flex-wrap">
+            <a class="btn btn-light btn-lg" href="#download"><i class="bi bi-download me-2"></i>Скачать APK</a>
+            <a class="btn btn-outline-light btn-lg" href="#about"><i class="bi bi-diagram-3 me-2"></i>Как это работает</a>
+          </div>
+        </div>
+        <div class="col-lg-4">
+          <div class="status-card p-4 rounded-4">
+            <div class="small text-uppercase">Статус</div>
+            <div id="versionBadge" class="h4 mb-2">Загрузка версии...</div>
+            <p id="versionSummary" class="mb-0">Получаем информацию о последней сборке.</p>
+          </div>
+        </div>
+      </div>
+    </div>
+  </header>
+
+  <main>
+    <section id="about" class="py-5">
+      <div class="container">
+        <h2 class="mb-4">Что внутри</h2>
+        <div class="row g-3">
+          <div class="col-md-4"><div class="feature p-3 rounded-4"><i class="bi bi-broadcast-pin fs-2"></i><h5 class="mt-2">BLE Discovery</h5><p class="mb-0">Обнаружение ближайших узлов и обмен пакетами.</p></div></div>
+          <div class="col-md-4"><div class="feature p-3 rounded-4"><i class="bi bi-share fs-2"></i><h5 class="mt-2">Mesh Relay</h5><p class="mb-0">Передача сообщений hop-by-hop с TTL и ACK.</p></div></div>
+          <div class="col-md-4"><div class="feature p-3 rounded-4"><i class="bi bi-shield-lock fs-2"></i><h5 class="mt-2">Безопасность</h5><p class="mb-0">Базовое шифрование и защита от дубликатов.</p></div></div>
+        </div>
+      </div>
+    </section>
+
+    <section id="download" class="py-5 border-top">
+      <div class="container">
+        <h2 class="mb-3">Скачать</h2>
+        <p id="downloadMeta">Доступна текущая debug-сборка Android-приложения.</p>
+        <a id="downloadBtn" class="btn btn-success" href="downloads/app-debug.apk"><i class="bi bi-phone me-2"></i>Скачать APK</a>
+      </div>
+    </section>
+  </main>
+
+  <footer class="py-4">
+    <div class="container d-flex justify-content-between flex-wrap gap-2">
+      <span>© 2026 School Mesh Project</span>
+      <span>Offline-first for schools</span>
+    </div>
+  </footer>
+
+  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/js/bootstrap.bundle.min.js"></script>
+  <script src="assets/js/app.js"></script>
+</body>
+</html>