android: move ATT code to viewmodel from screens and enable notifications

README.md

@@ -31,46 +31,6 @@ Development paused due to lack of time until June 2026 (JEE Advanced). PRs and i
 
 LibrePods allows you to use AirPods features that are exclusive to Apple devices. It implements the proprietary protocol used to exchange data between AirPods and Apple devices, enabling features like changing noise control modes, fast ear detection, accurate battery status, head gestures, conversational awareness, and more on non-Apple platforms.
 
-# Installation
-
-> [!IMPORTANT]
-> Before installing, please read the [feature availability](#feature-availability) and platform-specific READMEs.
-
-## Android
-
-### README: [android/README.md](./android/README.md)
-
-### Google Play Store
-
-If you are using a supported device/OS combination listed in the [root requirements section](/android/#root-requirement), you can install LibrePods from the Google Play Store. You can use the VendorID hook features with root even from the Play Store version.
-
-<a href="https://play.google.com/store/apps/details?id=me.kavishdevar.librepods"><img width="170" alt="GetItOnGooglePlay_Badge_Web_color_English" src="https://github.com/user-attachments/assets/2948308f-af92-443f-94d9-ee381c3a6ccc"/></a>
-
-
-### GitHub Releases
-
-If you need xposed because of the [root requirement](#root-requirement), you will have to use the apk/zip from the [GitHub releases](https://github.com/kavishdevar/librepods/releases/latest).
-
-### Root Module
-
-If you want LibrePods to have privileged Bluetooth permissions to 
-- show battery status in the system settings and widgets
-- show AirPods icon in the system settings (xposed is also currently required for this)
-- disconnect AirPods when you take them out of your ears
-
-## Linux
-
-### README: [linux/README.md](./linux/README.md)
-
-### GitHub Releases
-
-The app is ready to download as an AppImage or an executable. You can download the latest pre-release from the [GitHub releases](https://github.com/kavishdevar/librepods/releases?q="linux-v0").
-
-### Nightly Builds (recommended)
-
-You can also try the latest build of the new version from the [GitHub Actions artifacts](https://github.com/kavishdevar/librepods/actions/workflows/ci-linux-rust.yml). On the latest successful workflow run, download the **librepods-x86_64.AppImage** or **librepods** binary from **Artifacts**.
-
-
 # Feature availability
 
 | Feature                                                     | Linux | Android |
@@ -93,8 +53,8 @@ You can also try the latest build of the new version from the [GitHub Actions ar
 | [Find My](#find-my)                                         | ❓     | ❓       |
 | [High quality two-way audio](#high-quality-two-way-audio)   | 🔴     | 🔴       |
 
-| Emoji | Meaning                                                             |
-| ----- | ------------------------------------------------------------------- |
+| Symbol | Meaning                                                             |
+| ------ | ------------------------------------------------------------------- |
 | ✅     | Implemented and works well                                          |
 | ⚪     | Needs [VendorID spoofing](#vendorid-spoofing); use at your own risk |
 | 🔴     | Not implemented yet; planned                                        |
@@ -122,9 +82,12 @@ This is being worked upon, check the #⁠reverse-engineering channel on the Libr
 ## High quality two-way audio
 On iOS/iPadOS, you can continue using A2DP while AirPods send the audio stream from its microphone over AACP. 
 
-Since there is no way on Android to have a virtual audio source which can be used for calls where the LibrePods app can provide the higher quality microphone stream, the app will need root on Android.s
+Since this needs deeper integration with audio on Android, it will most likely need root.
 
-&ast; Features marked with an asterisk require the VendorID to be change to that of Apple.
+# Installation
+
+- [**Android**](/android/README.md)
+- [**Linux**](/linux/README.md)
 
 # VendorID Spoofing
 

android/app/build.gradle.kts

@@ -41,7 +41,7 @@ android {
     defaultConfig {
         applicationId = "me.kavishdevar.librepods"
         targetSdk = 37
-        versionCode = 52
+        versionCode = 55
         versionName = appVersionName
     }
     buildTypes {
@@ -56,7 +56,6 @@ android {
                     arguments += "-DCMAKE_BUILD_TYPE=Release"
                 }
             }
-            buildConfigField("Boolean", "PLAY_BUILD", "false")
             if (releaseSigningAvailable) {
                 signingConfig = signingConfigs.getByName("release")
             }
@@ -65,7 +64,6 @@ android {
             }
         }
         debug {
-            buildConfigField("Boolean", "PLAY_BUILD", "false")
             if (releaseSigningAvailable) {
                 signingConfig = signingConfigs.getByName("release")
             }

android/app/src/main/java/me/kavishdevar/librepods/MainActivity.kt

@@ -466,7 +466,7 @@ fun Main() {
                         OpenSourceLicensesScreen(navController)
                     }
                     composable("update_hearing_test") {
-                        if (airPodsViewModel != null) UpdateHearingTestScreen()
+                        if (airPodsViewModel != null) UpdateHearingTestScreen(airPodsViewModel)
                     }
                     composable("version_info") {
                         if (airPodsViewModel != null) VersionScreen(airPodsViewModel)

android/app/src/main/java/me/kavishdevar/librepods/bluetooth/AACPManager.kt

@@ -1143,7 +1143,7 @@ class AACPManager {
                 )
             }
 
-            val socket = BluetoothConnectionManager.getCurrentSocket() ?: return false
+            val socket = BluetoothConnectionManager.getAACPSocket() ?: return false
 
             if (socket.isConnected) {
                 socket.outputStream?.write(packet)

android/app/src/main/java/me/kavishdevar/librepods/bluetooth/ATTManager.kt

@@ -16,234 +16,196 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
- /* This is a very basic ATT (Attribute Protocol) implementation. I have only implemented
-  * what is necessary for LibrePods to function, i.e. reading and writing characteristics,
-  * and receiving notifications. It is not a complete implementation of the ATT protocol.
- */
-
 package me.kavishdevar.librepods.bluetooth
 
-import android.annotation.SuppressLint
-import android.bluetooth.BluetoothAdapter
-import android.bluetooth.BluetoothDevice
-import android.bluetooth.BluetoothSocket
-import android.os.ParcelUuid
 import android.util.Log
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import java.io.InputStream
-import java.io.OutputStream
+import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.LinkedBlockingQueue
 import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicBoolean
+
+private const val TAG = "ATTManager"
 
 enum class ATTHandles(val value: Int) {
     TRANSPARENCY(0x18),
     LOUD_SOUND_REDUCTION(0x1B),
-    HEARING_AID(0x2A),
+    HEARING_AID(0x2A)
 }
 
 enum class ATTCCCDHandles(val value: Int) {
     TRANSPARENCY(ATTHandles.TRANSPARENCY.value + 1),
-    LOUD_SOUND_REDUCTION(ATTHandles.LOUD_SOUND_REDUCTION.value + 1),
-    HEARING_AID(ATTHandles.HEARING_AID.value + 1),
+//    LOUD_SOUND_REDUCTION(ATTHandles.LOUD_SOUND_REDUCTION.value + 1), // doesn't work
+    HEARING_AID(ATTHandles.HEARING_AID.value + 1)
 }
 
-class ATTManager(private val adapter: BluetoothAdapter, private val device: BluetoothDevice) {
-    companion object {
-        private const val TAG = "ATTManager"
+class ATTManagerv2 {
+    val characteristicList = mutableMapOf<ATTHandles, ByteArray>()
 
-        private const val OPCODE_READ_REQUEST: Byte = 0x0A
-        private const val OPCODE_WRITE_REQUEST: Byte = 0x12
-        private const val OPCODE_HANDLE_VALUE_NTF: Byte = 0x1B
+    private val responseQueues = ConcurrentHashMap<Byte, LinkedBlockingQueue<ByteArray>>()
+
+    private val readerRunning = AtomicBoolean(false)
+    private var readerThread: Thread? = null
+
+    private var onNotificationReceived: ((handle: Byte, value: ByteArray) -> Unit)? = null
+
+    fun startReader() {
+        if (readerRunning.getAndSet(true)) return
+
+        readerThread = Thread {
+            try {
+                runReaderLoop()
+            } catch (t: Throwable) {
+                Log.e(TAG, "reader thread crashed: ${t.message}", t)
+            } finally {
+                readerRunning.set(false)
+                Log.d(TAG, "reader thread stopped")
+            }
+        }.also { it.name = "ATT-Reader"; it.isDaemon = true; it.start() }
+        Log.d(TAG, "reader started")
     }
 
-    var socket: BluetoothSocket? = null
-    private var input: InputStream? = null
-    private var output: OutputStream? = null
-    private val listeners = mutableMapOf<Int, MutableList<(ByteArray) -> Unit>>()
-    private var notificationJob: Job? = null
+    fun stopReader() {
+        readerRunning.set(false)
+        readerThread?.interrupt()
+        readerThread = null
+    }
 
-    // queue for non-notification PDUs (responses to requests)
-    private val responses = LinkedBlockingQueue<ByteArray>()
+    fun setOnNotificationReceived(listener: ((handle: Byte, value: ByteArray) -> Unit)?) {
+        onNotificationReceived = listener
+    }
 
-    @SuppressLint("MissingPermission")
-    fun connect() {
-        val uuid = ParcelUuid.fromString("00000000-0000-0000-0000-000000000000")
+    fun enableNotification(handle: ATTCCCDHandles) {
+        writeCharacteristic(handle.value.toByte(), byteArrayOf(0x01))
+    }
 
+    fun getCharacteristic(handle: ATTHandles): ByteArray? {
+        val storedValue = characteristicList[handle]
+        return if (storedValue?.isNotEmpty() != true) {
+            readCharacteristic(handle)
+        } else storedValue
+    }
+
+    fun readCharacteristic(handle: ATTHandles, timeoutMillis: Long = 2000): ByteArray? {
+        val socket = BluetoothConnectionManager.getATTSocket() ?: return null
         try {
-            socket = createBluetoothSocket(adapter, device, uuid)
+            val output = socket.outputStream
+            val pdu = byteArrayOf(0x0A, handle.value.toByte(), 0x00)
+            synchronized(output) {
+                output.write(pdu)
+                output.flush()
+            }
+            Log.d(TAG, "sending read request: ${pdu.joinToString(" ") { String.format("%02X", it) }}")
+
+            val resp = waitForResponse(0x0B, timeoutMillis) ?: run {
+                Log.e(TAG, "Timeout waiting for Read Response (0x0B) for handle ${handle.value}")
+                return null
+            }
+
+            Log.d(TAG, "read response: ${resp.joinToString(" ") { String.format("%02X", it) }}")
+            val value = resp.copyOfRange(1, resp.size)
+            characteristicList[handle] = value
+            return value
         } catch (e: Exception) {
-            Log.w(TAG, "Failed to create socket")
+            Log.e(TAG, "error reading characteristic: ${e.message}")
+            return null
         }
+    }
+
+    fun writeCharacteristic(handle: ATTHandles, data: ByteArray, timeoutMillis: Long = 2000) {
+        characteristicList[handle] = data
+        writeCharacteristic(handle.value.toByte(), data, timeoutMillis)
+    }
+
+    fun writeCharacteristic(handle: Byte, data: ByteArray, timeoutMillis: Long = 2000) {
+        val socket = BluetoothConnectionManager.getATTSocket() ?: return
         try {
-            socket!!.connect()
+            val output = socket.outputStream
+            val pdu = byteArrayOf(0x12, handle, 0x00) + data // 0x00 for LE
+            synchronized(output) {
+                output.write(pdu)
+                output.flush()
+            }
+            Log.d(TAG, "sending write request: ${pdu.joinToString(" ") { String.format("%02X", it) }}")
+
+            val resp = waitForResponse(0x13, timeoutMillis) ?: run {
+                Log.e(TAG, "timeout waiting for response (0x13) for handle ${String.format("%02X", handle)}")
+                return
+            }
+
+            Log.d(TAG, "write respose: ${resp.joinToString(" ") { String.format("%02X", it) }}")
         } catch (e: Exception) {
-            Log.w(TAG, "ATT socket failed to connect")
+            Log.e(TAG, "error writing characteristic: ${e.message}")
+        }
+    }
+
+    fun disconnected() {
+        characteristicList.clear()
+        stopReader()
+        val socket = BluetoothConnectionManager.getATTSocket() ?: return
+        try {
+            socket.close()
+        } catch (e: Exception) {
+            Log.w(TAG, "error closing socket: ${e.message}")
+        }
+        Log.d(TAG, "ATT disconnected")
+    }
+
+    private fun runReaderLoop() {
+        val socket = BluetoothConnectionManager.getATTSocket() ?: run {
+            Log.w(TAG, "ATT socket not available. stopping reader")
+            readerRunning.set(false)
             return
         }
-        input = socket!!.inputStream
-        output = socket!!.outputStream
-        Log.d(TAG, "Connected to ATT")
 
-        notificationJob = CoroutineScope(Dispatchers.IO).launch {
-            while (socket?.isConnected == true) {
-                try {
-                    val pdu = readPDU()
-                    if (pdu.isNotEmpty() && pdu[0] == OPCODE_HANDLE_VALUE_NTF) {
-                        // notification -> dispatch to listeners
-                        val handle = (pdu[1].toInt() and 0xFF) or ((pdu[2].toInt() and 0xFF) shl 8)
-                        val value = pdu.copyOfRange(3, pdu.size)
-                        listeners[handle]?.forEach { listener ->
-                            try {
-                                listener(value)
-                                Log.d(TAG, "Dispatched notification for handle $handle to listener, with value ${value.joinToString(" ") { String.format("%02X", it) }}")
-                            } catch (e: Exception) {
-                                Log.w(TAG, "Error in listener for handle $handle: ${e.message}")
-                            }
+        val input = socket.inputStream
+        val buffer = ByteArray(512)
+
+        while (readerRunning.get()) {
+            try {
+                val len = input.read(buffer)
+                if (len == -1) {
+                    Log.w(TAG, "ATT input stream ended")
+                    break
+                }
+                val data = buffer.copyOfRange(0, len)
+                if (data.isEmpty()) continue
+
+                val opcode = data[0]
+                Log.d(TAG, "pdu received ${data.joinToString(" ") { String.format("%02X", it) }}")
+
+                val queue = responseQueues.computeIfAbsent(opcode) { LinkedBlockingQueue() }
+                queue.offer(data)
+
+                if (opcode == 0x1B.toByte()) {
+                    if (data.size >= 3) {
+                        val handle = data[1]
+                        val value = if (data.size > 3) data.copyOfRange(3, data.size) else ByteArray(0)
+                        Log.d(TAG, "notification/indication handle=0x${String.format("%02X", handle)} value=${value.toHexString()}")
+                        try {
+                            onNotificationReceived?.invoke(handle, value)
+                        } catch (t: Throwable) {
+                            Log.e(TAG, "onNotificationReceived threw: ${t.message}", t)
                         }
                     } else {
-                        // not a notification -> treat as a response for pending request(s)
-                        responses.put(pdu)
+                        Log.w(TAG, "notification PDU too short: ${data.joinToString(" ") { String.format("%02X", it) }}")
                     }
-                } catch (e: Exception) {
-                    Log.w(TAG, "Error reading notification/response: ${e.message}")
-                    if (socket?.isConnected != true) break
                 }
-            }
-        }
-    }
-
-    fun disconnect() {
-        try {
-            notificationJob?.cancel()
-            socket?.close()
-        } catch (e: Exception) {
-            Log.w(TAG, "Error closing socket: ${e.message}")
-        }
-    }
-
-    fun registerListener(handle: ATTHandles, listener: (ByteArray) -> Unit) {
-        listeners.getOrPut(handle.value) { mutableListOf() }.add(listener)
-    }
-
-    fun unregisterListener(handle: ATTHandles, listener: (ByteArray) -> Unit) {
-        listeners[handle.value]?.remove(listener)
-    }
-
-    fun enableNotifications(handle: ATTHandles) {
-        write(ATTCCCDHandles.valueOf(handle.name), byteArrayOf(0x01, 0x00))
-    }
-
-    fun read(handle: ATTHandles): ByteArray {
-        val lsb = (handle.value and 0xFF).toByte()
-        val msb = ((handle.value shr 8) and 0xFF).toByte()
-        val pdu = byteArrayOf(OPCODE_READ_REQUEST, lsb, msb)
-        writeRaw(pdu)
-        // wait for response placed into responses queue by the reader coroutine
-        return readResponse()
-    }
-
-    fun write(handle: ATTHandles, value: ByteArray) {
-        val lsb = (handle.value and 0xFF).toByte()
-        val msb = ((handle.value shr 8) and 0xFF).toByte()
-        val pdu = byteArrayOf(OPCODE_WRITE_REQUEST, lsb, msb) + value
-        writeRaw(pdu)
-        // usually a Write Response (0x13) will arrive; wait for it (but discard return)
-        try {
-            readResponse()
-        } catch (e: Exception) {
-            Log.w(TAG, "No write response received: ${e.message}")
-        }
-    }
-
-    fun write(handle: ATTCCCDHandles, value: ByteArray) {
-        val lsb = (handle.value and 0xFF).toByte()
-        val msb = ((handle.value shr 8) and 0xFF).toByte()
-        val pdu = byteArrayOf(OPCODE_WRITE_REQUEST, lsb, msb) + value
-        writeRaw(pdu)
-        // usually a Write Response (0x13) will arrive; wait for it (but discard return)
-        try {
-            readResponse()
-        } catch (e: Exception) {
-            Log.w(TAG, "No write response received: ${e.message}")
-        }
-    }
-
-    private fun writeRaw(pdu: ByteArray) {
-        if (output == null) return
-        output?.write(pdu)
-        output?.flush()
-        Log.d(TAG, "writeRaw: ${pdu.joinToString(" ") { String.format("%02X", it) }}")
-    }
-
-    // rename / specialize: read raw PDU directly from input stream (blocking)
-    private fun readPDU(): ByteArray {
-        val inp = input ?: throw IllegalStateException("Not connected")
-        val buffer = ByteArray(512)
-        val len = inp.read(buffer)
-        if (len == -1) {
-            disconnect()
-            throw IllegalStateException("End of stream reached")
-        }
-        val data = buffer.copyOfRange(0, len)
-        Log.d(TAG, "readPDU: ${data.joinToString(" ") { String.format("%02X", it) }}")
-        return data
-    }
-
-    // wait for a response PDU produced by the background reader
-    private fun readResponse(timeoutMs: Long = 2000): ByteArray {
-        try {
-            val resp = responses.poll(timeoutMs, TimeUnit.MILLISECONDS)
-                ?: throw IllegalStateException("No response read from ATT socket within $timeoutMs ms")
-            Log.d(TAG, "readResponse: ${resp.joinToString(" ") { String.format("%02X", it) }}")
-            return resp.copyOfRange(1, resp.size)
-        } catch (e: InterruptedException) {
-            Thread.currentThread().interrupt()
-            throw IllegalStateException("Interrupted while waiting for ATT response", e)
-        }
-    }
-
-    private fun createBluetoothSocket(adapter: BluetoothAdapter, device: BluetoothDevice, uuid: ParcelUuid): BluetoothSocket {
-        val type = 3 // L2CAP
-        val constructorSpecs = listOf(
-            arrayOf(adapter, device, type, true, true, 31, uuid),
-            arrayOf(device, type, true, true, 31, uuid),
-            arrayOf(device, type, 1, true, true, 31, uuid),
-            arrayOf(type, 1, true, true, device, 31, uuid),
-            arrayOf(type, true, true, device, 31, uuid)
-        )
-
-        val constructors = BluetoothSocket::class.java.declaredConstructors
-        Log.d("ATTManager", "BluetoothSocket has ${constructors.size} constructors:")
-
-        constructors.forEachIndexed { index, constructor ->
-            val params = constructor.parameterTypes.joinToString(", ") { it.simpleName }
-            Log.d("ATTManager", "Constructor $index: ($params)")
-        }
-
-        var lastException: Exception? = null
-        var attemptedConstructors = 0
-
-        for ((index, params) in constructorSpecs.withIndex()) {
-            try {
-                Log.d("ATTManager", "Trying constructor signature #${index + 1}")
-                attemptedConstructors++
-
-                val paramTypes = params.map { it::class.javaPrimitiveType ?: it::class.java }.toTypedArray()
-                val constructor = BluetoothSocket::class.java.getDeclaredConstructor(*paramTypes)
-                constructor.isAccessible = true
-                return constructor.newInstance(*params) as BluetoothSocket
-
             } catch (e: Exception) {
-                Log.e("ATTManager", "Constructor signature #${index + 1} failed: ${e.message}")
-                lastException = e
+                Log.e(TAG, "error in reader loop: ${e.message}", e)
+                break
             }
         }
 
-        val errorMessage = "Failed to create BluetoothSocket after trying $attemptedConstructors constructor signatures"
-        Log.e("ATTManager", errorMessage)
-        throw lastException ?: IllegalStateException(errorMessage)
+        readerRunning.set(false)
+    }
+
+    private fun waitForResponse(opcode: Byte, timeoutMillis: Long): ByteArray? {
+        val queue = responseQueues.computeIfAbsent(opcode) { LinkedBlockingQueue() }
+        return try {
+            queue.poll(timeoutMillis, TimeUnit.MILLISECONDS)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
     }
 }

android/app/src/main/java/me/kavishdevar/librepods/bluetooth/BluetoothConnectionManager.kt

@@ -18,23 +18,22 @@
 
 package me.kavishdevar.librepods.bluetooth
 
-import android.bluetooth.BluetoothDevice
 import android.bluetooth.BluetoothSocket
-import android.util.Log
 
 object BluetoothConnectionManager {
-    private const val TAG = "BluetoothConnectionManager"
+    private var aacpSocket: BluetoothSocket? = null
+    private var attSocket: BluetoothSocket? = null
 
-    private var currentSocket: BluetoothSocket? = null
-    private var currentDevice: BluetoothDevice? = null
-
-    fun setCurrentConnection(socket: BluetoothSocket, device: BluetoothDevice) {
-        currentSocket = socket
-        currentDevice = device
-        Log.d(TAG, "Current connection set to device: ${device.address}")
+    fun setCurrentConnection(aacpSocket: BluetoothSocket?, attSocket: BluetoothSocket?) {
+        BluetoothConnectionManager.aacpSocket = aacpSocket
+        BluetoothConnectionManager.attSocket = attSocket
     }
 
-    fun getCurrentSocket(): BluetoothSocket? {
-        return currentSocket
+    fun getAACPSocket(): BluetoothSocket? {
+        return aacpSocket
+    }
+
+    fun getATTSocket(): BluetoothSocket? {
+        return attSocket
     }
 }

android/app/src/main/java/me/kavishdevar/librepods/data/HearingAid.kt

@@ -26,7 +26,6 @@ import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import me.kavishdevar.librepods.bluetooth.ATTHandles
-import me.kavishdevar.librepods.bluetooth.ATTManager
 import java.io.IOException
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
@@ -138,15 +137,15 @@ fun parseHearingAidSettingsResponse(data: ByteArray): HearingAidSettings? {
 }
 
 fun sendHearingAidSettings(
-    attManager: ATTManager,
+    currentData: ByteArray,
     hearingAidSettings: HearingAidSettings,
-    debounceJob: MutableState<Job?>
+    debounceJob: MutableState<Job?>,
+    sender: (ATTHandles, ByteArray) -> Unit
 ) {
     debounceJob.value?.cancel()
     debounceJob.value = CoroutineScope(Dispatchers.IO).launch {
         delay(100)
         try {
-            val currentData = attManager.read(ATTHandles.HEARING_AID)
             Log.d(TAG, "Current data before update: ${currentData.joinToString(" ") { String.format("%02X", it) }}")
             if (currentData.size < 104) {
                 Log.w(TAG, "Current data size ${currentData.size} too small, cannot send settings")
@@ -184,7 +183,7 @@ fun sendHearingAidSettings(
 
             Log.d(TAG, "Sending updated settings: ${currentData.joinToString(" ") { String.format("%02X", it) }}")
 
-            attManager.write(ATTHandles.HEARING_AID, currentData)
+            sender(ATTHandles.HEARING_AID, currentData)
         } catch (e: IOException) {
             e.printStackTrace()
         }

android/app/src/main/java/me/kavishdevar/librepods/data/Transparency.kt

@@ -83,7 +83,8 @@ data class TransparencySettings(
     }
 }
 
-fun parseTransparencySettingsResponse(data: ByteArray): TransparencySettings {
+fun parseTransparencySettingsResponse(data: ByteArray): TransparencySettings? {
+    if (data.size < 50) return null // 50 is arbitrary, too lazy to count
     val buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN)
 
     val enabled = buffer.float

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/AirPodsSettingsScreen.kt

@@ -23,10 +23,14 @@ package me.kavishdevar.librepods.presentation.screens
 // import me.kavishdevar.librepods.utils.RadareOffsetFinder
 import android.annotation.SuppressLint
 import android.content.Context.MODE_PRIVATE
+import android.content.Intent
 import android.content.SharedPreferences
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
@@ -51,6 +55,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.input.pointer.PointerEventPass
 import androidx.compose.ui.input.pointer.pointerInput
@@ -64,6 +69,7 @@ import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.core.net.toUri
 import androidx.navigation.NavController
 import com.kyant.backdrop.backdrops.rememberLayerBackdrop
 import com.kyant.backdrop.drawBackdrop
@@ -93,6 +99,7 @@ import me.kavishdevar.librepods.presentation.components.StyledIconButton
 import me.kavishdevar.librepods.presentation.components.StyledScaffold
 import me.kavishdevar.librepods.presentation.components.StyledToggle
 import me.kavishdevar.librepods.presentation.viewmodel.AirPodsViewModel
+import java.util.concurrent.TimeUnit
 import kotlin.io.encoding.ExperimentalEncodingApi
 
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalHazeMaterialsApi::class)
@@ -170,6 +177,44 @@ fun AirPodsSettingsScreen(viewModel: AirPodsViewModel, navController: NavControl
                         }
                     } else Modifier)) {
                 item(key = "spacer_top") { Spacer(modifier = Modifier.height(topPadding)) }
+
+                item(key = "play_update_banner") {
+                    if (state.timeUntilFOSSPremiumExpiry > 0L) {
+                        val context = LocalContext.current
+                        Box(
+                            modifier = Modifier
+                                .background(Color(0xFF32829B), RoundedCornerShape(28.dp))
+                                .clip(RoundedCornerShape(28.dp))
+                                .clickable {
+                                    val emailIntent = Intent(Intent.ACTION_SENDTO).apply {
+                                        data = "mailto:".toUri()
+                                        putExtra(Intent.EXTRA_EMAIL, arrayOf("billing@kavish.xyz"))
+                                        putExtra(Intent.EXTRA_SUBJECT, "LibrePods Play billing error")
+                                        putExtra(
+                                            Intent.EXTRA_TEXT,
+                                            "Please enter your GitHub username to restore your premium access:\n\nGitHub username: "
+                                        )
+                                    }
+                                    context.startActivity(emailIntent)
+                                }
+                        ) {
+                            Text(
+                                text = stringResource(
+                                    R.string.play_foss_premium_banner, maxOf(1, TimeUnit.MILLISECONDS.toDays(state.timeUntilFOSSPremiumExpiry).toInt())
+                                ),
+                                modifier = Modifier
+                                    .padding(16.dp),
+                                style = TextStyle(
+                                    fontSize = 16.sp,
+                                    fontWeight = FontWeight.Bold,
+                                    color = Color.White,
+                                    fontFamily = FontFamily(Font(R.font.sf_pro))
+                                )
+                            )
+                        }
+                    }
+                }
+
                 item(key = "battery") {
                     BatteryView(
                         batteryList = state.battery,

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/AppSettingsScreen.kt

@@ -24,6 +24,7 @@ import android.net.Uri
 import android.os.Build
 import android.widget.Toast
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -91,6 +92,7 @@ import me.kavishdevar.librepods.presentation.components.StyledSlider
 import me.kavishdevar.librepods.presentation.components.StyledToggle
 import me.kavishdevar.librepods.presentation.viewmodel.AppSettingsViewModel
 import me.kavishdevar.librepods.utils.XposedState
+import java.util.concurrent.TimeUnit
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -147,7 +149,39 @@ fun AppSettingsScreen(
                     )
                 }
             }
-
+            if (state.timeUntilFOSSPremiumExpiry > 0L) {
+                Box(
+                    modifier = Modifier
+                        .background(Color(0xFF32829B), RoundedCornerShape(28.dp))
+                        .clip(RoundedCornerShape(28.dp))
+                        .clickable {
+                            val emailIntent = Intent(Intent.ACTION_SENDTO).apply {
+                                data = "mailto:".toUri()
+                                putExtra(Intent.EXTRA_EMAIL, arrayOf("billing@kavish.xyz"))
+                                putExtra(Intent.EXTRA_SUBJECT, "LibrePods Play billing error")
+                                putExtra(
+                                    Intent.EXTRA_TEXT,
+                                    "Please enter your GitHub username to restore your premium access:\n\nGitHub username: "
+                                )
+                            }
+                            context.startActivity(emailIntent)
+                        }
+                ) {
+                    Text(
+                        text = stringResource(
+                            R.string.play_foss_premium_banner, maxOf(1, TimeUnit.MILLISECONDS.toDays(state.timeUntilFOSSPremiumExpiry).toInt())
+                        ),
+                        modifier = Modifier
+                            .padding(16.dp),
+                        style = TextStyle(
+                            fontSize = 16.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color.White,
+                            fontFamily = FontFamily(Font(R.font.sf_pro))
+                        )
+                    )
+                }
+            }
             if (state.connectionSuccessful) {
                 StyledToggle(
                     title = stringResource(R.string.widget),

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/HearingAidAdjustmentsScreen.kt

@@ -32,13 +32,12 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
-import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
@@ -48,22 +47,17 @@ import dev.chrisbanes.haze.HazeState
 import dev.chrisbanes.haze.hazeSource
 import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.delay
 import me.kavishdevar.librepods.R
-import me.kavishdevar.librepods.presentation.components.StyledScaffold
-import me.kavishdevar.librepods.presentation.components.StyledSlider
-import me.kavishdevar.librepods.presentation.components.StyledToggle
-import me.kavishdevar.librepods.services.ServiceManager
 import me.kavishdevar.librepods.bluetooth.AACPManager
-import me.kavishdevar.librepods.bluetooth.ATTHandles
 import me.kavishdevar.librepods.data.HearingAidSettings
 import me.kavishdevar.librepods.data.parseHearingAidSettingsResponse
 import me.kavishdevar.librepods.data.sendHearingAidSettings
+import me.kavishdevar.librepods.presentation.components.StyledScaffold
+import me.kavishdevar.librepods.presentation.components.StyledSlider
+import me.kavishdevar.librepods.presentation.components.StyledToggle
 import me.kavishdevar.librepods.presentation.viewmodel.AirPodsViewModel
-import java.io.IOException
 import kotlin.io.encoding.ExperimentalEncodingApi
 
-private var debounceJob: MutableState<Job?> = mutableStateOf(null)
 private const val TAG = "HearingAidAdjustments"
 
 @SuppressLint("DefaultLocale")
@@ -74,14 +68,83 @@ fun HearingAidAdjustmentsScreen(viewModel: AirPodsViewModel) {
     isSystemInDarkTheme()
     val verticalScrollState = rememberScrollState()
     val hazeState = remember { HazeState() }
-    val attManager = ServiceManager.getService()?.attManager ?: throw IllegalStateException("ATTManager not available")
-
     val state by viewModel.uiState.collectAsState()
-
     val backdrop = rememberLayerBackdrop()
-    StyledScaffold(
-        title = stringResource(R.string.adjustments)
-    ) { spacerHeight ->
+
+    val debounceJob = remember { mutableStateOf<Job?>(null) }
+
+    val amplificationSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+    val balanceSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+    val toneSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+    val ambientNoiseReductionSliderValue = rememberSaveable { mutableFloatStateOf(0.0f) }
+    val conversationBoostEnabled = rememberSaveable { mutableStateOf(false) }
+    val leftEQ = rememberSaveable { mutableStateOf(FloatArray(8)) }
+    val rightEQ = rememberSaveable { mutableStateOf(FloatArray(8)) }
+    val ownVoiceAmplification = rememberSaveable { mutableFloatStateOf(0.5f) }
+
+    val initialized = rememberSaveable { mutableStateOf(false) }
+
+    val hearingAidSettings = remember { mutableStateOf(
+        HearingAidSettings(
+            leftEQ = leftEQ.value,
+            rightEQ = rightEQ.value,
+            leftAmplification = 0f,
+            rightAmplification = 0f,
+            leftTone = 0f,
+            rightTone = 0f,
+            leftConversationBoost = false,
+            rightConversationBoost = false,
+            leftAmbientNoiseReduction = 0f,
+            rightAmbientNoiseReduction = 0f,
+            netAmplification = 0f,
+            balance = 0f,
+            ownVoiceAmplification = 0f
+        )
+    ) }
+
+    LaunchedEffect(state.hearingAidData) {
+        parseHearingAidSettingsResponse(state.hearingAidData)?.let { parsed ->
+            amplificationSliderValue.floatValue = parsed.netAmplification
+            balanceSliderValue.floatValue = parsed.balance
+            toneSliderValue.floatValue = parsed.leftTone
+            ambientNoiseReductionSliderValue.floatValue = parsed.leftAmbientNoiseReduction
+            conversationBoostEnabled.value = parsed.leftConversationBoost
+            leftEQ.value = parsed.leftEQ.copyOf()
+            rightEQ.value = parsed.rightEQ.copyOf()
+            ownVoiceAmplification.floatValue = parsed.ownVoiceAmplification
+            initialized.value = true
+        }
+    }
+
+    LaunchedEffect(
+        amplificationSliderValue.floatValue,
+        balanceSliderValue.floatValue,
+        toneSliderValue.floatValue,
+        conversationBoostEnabled.value,
+        ambientNoiseReductionSliderValue.floatValue,
+        ownVoiceAmplification.floatValue
+    ) {
+        if (!initialized.value) return@LaunchedEffect
+        hearingAidSettings.value = HearingAidSettings(
+            leftEQ = leftEQ.value,
+            rightEQ = rightEQ.value,
+            leftAmplification = amplificationSliderValue.floatValue + if (balanceSliderValue.floatValue < 0) -balanceSliderValue.floatValue else 0f,
+            rightAmplification = amplificationSliderValue.floatValue + if (balanceSliderValue.floatValue > 0) balanceSliderValue.floatValue else 0f,
+            leftTone = toneSliderValue.floatValue,
+            rightTone = toneSliderValue.floatValue,
+            leftConversationBoost = conversationBoostEnabled.value,
+            rightConversationBoost = conversationBoostEnabled.value,
+            leftAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
+            rightAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
+            netAmplification = amplificationSliderValue.floatValue,
+            balance = balanceSliderValue.floatValue,
+            ownVoiceAmplification = ownVoiceAmplification.floatValue
+        )
+        Log.d(TAG, "Updated settings: ${hearingAidSettings.value}")
+        sendHearingAidSettings(state.hearingAidData, hearingAidSettings.value, debounceJob, viewModel::setATTCharacteristicValue)
+    }
+
+    StyledScaffold(title = stringResource(R.string.adjustments)) { spacerHeight ->
         Column(
             modifier = Modifier
                 .hazeSource(hazeState)
@@ -93,136 +156,6 @@ fun HearingAidAdjustmentsScreen(viewModel: AirPodsViewModel) {
         ) {
             Spacer(modifier = Modifier.height(spacerHeight))
 
-            val amplificationSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val balanceSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val toneSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val ambientNoiseReductionSliderValue = remember { mutableFloatStateOf(0.0f) }
-            val conversationBoostEnabled = remember { mutableStateOf(false) }
-            val leftEQ = remember { mutableStateOf(FloatArray(8)) }
-            val rightEQ = remember { mutableStateOf(FloatArray(8)) }
-            val ownVoiceAmplification = remember { mutableFloatStateOf(0.5f) }
-
-            val initialLoadComplete = remember { mutableStateOf(false) }
-
-            val initialReadSucceeded = remember { mutableStateOf(false) }
-            val initialReadAttempts = remember { mutableIntStateOf(0) }
-
-            val hearingAidSettings = remember {
-                mutableStateOf(
-                    HearingAidSettings(
-                        leftEQ = leftEQ.value,
-                        rightEQ = rightEQ.value,
-                        leftAmplification = amplificationSliderValue.floatValue + (0.5f - balanceSliderValue.floatValue) * amplificationSliderValue.floatValue * 2,
-                        rightAmplification = amplificationSliderValue.floatValue + (balanceSliderValue.floatValue - 0.5f) * amplificationSliderValue.floatValue * 2,
-                        leftTone = toneSliderValue.floatValue,
-                        rightTone = toneSliderValue.floatValue,
-                        leftConversationBoost = conversationBoostEnabled.value,
-                        rightConversationBoost = conversationBoostEnabled.value,
-                        leftAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
-                        rightAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
-                        netAmplification = amplificationSliderValue.floatValue,
-                        balance = balanceSliderValue.floatValue,
-                        ownVoiceAmplification = ownVoiceAmplification.floatValue
-                    )
-                )
-            }
-
-            val hearingAidATTListener = remember {
-                object : (ByteArray) -> Unit {
-                    override fun invoke(value: ByteArray) {
-                        val parsed = parseHearingAidSettingsResponse(value)
-                        if (parsed != null) {
-                            amplificationSliderValue.floatValue = parsed.netAmplification
-                            balanceSliderValue.floatValue = parsed.balance
-                            toneSliderValue.floatValue = parsed.leftTone
-                            ambientNoiseReductionSliderValue.floatValue = parsed.leftAmbientNoiseReduction
-                            conversationBoostEnabled.value = parsed.leftConversationBoost
-                            leftEQ.value = parsed.leftEQ.copyOf()
-                            rightEQ.value = parsed.rightEQ.copyOf()
-                            ownVoiceAmplification.floatValue = parsed.ownVoiceAmplification
-                            Log.d(TAG, "Updated hearing aid settings from notification")
-                        } else {
-                            Log.w(TAG, "Failed to parse hearing aid settings from notification")
-                        }
-                    }
-                }
-            }
-
-            LaunchedEffect(amplificationSliderValue.floatValue, balanceSliderValue.floatValue, toneSliderValue.floatValue, conversationBoostEnabled.value, ambientNoiseReductionSliderValue.floatValue, ownVoiceAmplification.floatValue, initialLoadComplete.value, initialReadSucceeded.value) {
-                if (!initialLoadComplete.value) {
-                    Log.d(TAG, "Initial device load not complete - skipping send")
-                    return@LaunchedEffect
-                }
-
-                if (!initialReadSucceeded.value) {
-                    Log.d(TAG, "Initial device read not successful yet - skipping send until read succeeds")
-                    return@LaunchedEffect
-                }
-
-                hearingAidSettings.value = HearingAidSettings(
-                    leftEQ = leftEQ.value,
-                    rightEQ = rightEQ.value,
-                    leftAmplification = amplificationSliderValue.floatValue + if (balanceSliderValue.floatValue < 0) -balanceSliderValue.floatValue else 0f,
-                    rightAmplification = amplificationSliderValue.floatValue + if (balanceSliderValue.floatValue > 0) balanceSliderValue.floatValue else 0f,
-                    leftTone = toneSliderValue.floatValue,
-                    rightTone = toneSliderValue.floatValue,
-                    leftConversationBoost = conversationBoostEnabled.value,
-                    rightConversationBoost = conversationBoostEnabled.value,
-                    leftAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
-                    rightAmbientNoiseReduction = ambientNoiseReductionSliderValue.floatValue,
-                    netAmplification = amplificationSliderValue.floatValue,
-                    balance = balanceSliderValue.floatValue,
-                    ownVoiceAmplification = ownVoiceAmplification.floatValue
-                )
-                Log.d(TAG, "Updated settings: ${hearingAidSettings.value}")
-                sendHearingAidSettings(attManager, hearingAidSettings.value, debounceJob)
-            }
-
-            LaunchedEffect(Unit) {
-                Log.d(TAG, "Connecting to ATT...")
-                try {
-                    attManager.enableNotifications(ATTHandles.HEARING_AID)
-                    attManager.registerListener(ATTHandles.HEARING_AID, hearingAidATTListener)
-
-                    var parsedSettings: HearingAidSettings? = null
-                    for (attempt in 1..3) {
-                        initialReadAttempts.intValue = attempt
-                        try {
-                            val data = attManager.read(ATTHandles.HEARING_AID)
-                            parsedSettings = parseHearingAidSettingsResponse(data = data)
-                            if (parsedSettings != null) {
-                                Log.d(TAG, "Parsed settings on attempt $attempt")
-                                break
-                            } else {
-                                Log.d(TAG, "Parsing returned null on attempt $attempt")
-                            }
-                        } catch (e: Exception) {
-                            Log.w(TAG, "Read attempt $attempt failed: ${e.message}")
-                        }
-                        delay(200)
-                    }
-
-                    if (parsedSettings != null) {
-                        Log.d(TAG, "Initial hearing aid settings: $parsedSettings")
-                        amplificationSliderValue.floatValue = parsedSettings.netAmplification
-                        balanceSliderValue.floatValue = parsedSettings.balance
-                        toneSliderValue.floatValue = parsedSettings.leftTone
-                        ambientNoiseReductionSliderValue.floatValue = parsedSettings.leftAmbientNoiseReduction
-                        conversationBoostEnabled.value = parsedSettings.leftConversationBoost
-                        leftEQ.value = parsedSettings.leftEQ.copyOf()
-                        rightEQ.value = parsedSettings.rightEQ.copyOf()
-                        ownVoiceAmplification.floatValue = parsedSettings.ownVoiceAmplification
-                        initialReadSucceeded.value = true
-                    } else {
-                        Log.d(TAG, "Failed to read/parse initial hearing aid settings after ${initialReadAttempts.intValue} attempts")
-                    }
-                } catch (e: IOException) {
-                    e.printStackTrace()
-                } finally {
-                    initialLoadComplete.value = true
-                }
-            }
-
             StyledSlider(
                 label = stringResource(R.string.amplification),
                 valueRange = -1f..1f,
@@ -235,7 +168,6 @@ fun HearingAidAdjustmentsScreen(viewModel: AirPodsViewModel) {
                 independent = true,
             )
 
-
             StyledToggle(
                 label = stringResource(R.string.swipe_to_control_amplification),
                 checked = state.controlStates[AACPManager.Companion.ControlCommandIdentifiers.HPS_GAIN_SWIPE]?.getOrNull(0) == 0x01.toByte(),

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/HearingAidScreen.kt

@@ -259,6 +259,10 @@ fun HearingAidScreen(viewModel: AirPodsViewModel, navController: NavController)
                         return@launch
                     }
                     val parsed = parseTransparencySettingsResponse(state.hearingAidData)
+                    if (parsed == null) {
+                        Log.w(TAG, "transparency parse failed")
+                        return@launch
+                    }
                     val disabledSettings = parsed.copy(enabled = false)
                     sendTransparencySettings(viewModel::setATTCharacteristicValue, disabledSettings)
                 } catch (e: Exception) {

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/PurchaseScreen.kt

@@ -53,11 +53,11 @@ import androidx.navigation.NavController
 import com.kyant.backdrop.backdrops.layerBackdrop
 import com.kyant.backdrop.backdrops.rememberLayerBackdrop
 import dev.chrisbanes.haze.hazeSource
-import me.kavishdevar.librepods.BuildConfig
 import me.kavishdevar.librepods.R
 import me.kavishdevar.librepods.presentation.components.StyledButton
 import me.kavishdevar.librepods.presentation.components.StyledScaffold
 import me.kavishdevar.librepods.presentation.viewmodel.PurchaseViewModel
+import me.kavishdevar.librepods.utils.XposedState
 
 @Composable
 fun PurchaseScreen(
@@ -199,7 +199,7 @@ fun PurchaseScreen(
                             )
                         )
                     }
-                    if (BuildConfig.FLAVOR == "xposed") {
+                    if (XposedState.isAvailable) {
                         HorizontalDivider(
                             thickness = 1.dp,
                             color = Color(0x40888888),

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/RenameScreen.kt

@@ -68,8 +68,9 @@ fun RenameScreen(viewModel: AirPodsViewModel) {
         ) {
             Spacer(modifier = Modifier.height(spacerHeight))
 
-            val textFieldState = rememberTextFieldState()
-            textFieldState.edit { sharedPreferences.getString("name", "") ?: "" }
+            val name = sharedPreferences.getString("name", "")?: ""
+            val textFieldState = rememberTextFieldState(initialText = name)
+            
             LaunchedEffect(textFieldState.text) {
                 sharedPreferences.edit {putString("name", textFieldState.text as String?)}
                 viewModel.setName(textFieldState.text.toString())

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/TransparencySettingsScreen.kt

@@ -46,9 +46,10 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
-import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.Saver
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.shadow
@@ -64,17 +65,14 @@ import com.kyant.backdrop.backdrops.layerBackdrop
 import com.kyant.backdrop.backdrops.rememberLayerBackdrop
 import dev.chrisbanes.haze.hazeSource
 import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
-import kotlinx.coroutines.delay
-import me.kavishdevar.librepods.BuildConfig
 import me.kavishdevar.librepods.R
-import me.kavishdevar.librepods.presentation.components.StyledScaffold
-import me.kavishdevar.librepods.presentation.components.StyledSlider
-import me.kavishdevar.librepods.presentation.components.StyledToggle
 import me.kavishdevar.librepods.data.TransparencySettings
 import me.kavishdevar.librepods.data.parseTransparencySettingsResponse
 import me.kavishdevar.librepods.data.sendTransparencySettings
+import me.kavishdevar.librepods.presentation.components.StyledScaffold
+import me.kavishdevar.librepods.presentation.components.StyledSlider
+import me.kavishdevar.librepods.presentation.components.StyledToggle
 import me.kavishdevar.librepods.presentation.viewmodel.AirPodsViewModel
-import java.io.IOException
 import kotlin.io.encoding.ExperimentalEncodingApi
 
 private const val TAG = "TransparencySettings"
@@ -112,19 +110,26 @@ fun TransparencySettingsScreen(viewModel: AirPodsViewModel) {
             Spacer(modifier = Modifier.height(topPadding))
             val backgroundColor = if (isDarkTheme) Color(0xFF1C1C1E) else Color(0xFFFFFFFF)
 
-            val enabled = remember { mutableStateOf(false) }
-            val amplificationSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val balanceSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val toneSliderValue = remember { mutableFloatStateOf(0.5f) }
-            val ambientNoiseReductionSliderValue = remember { mutableFloatStateOf(0.0f) }
-            val conversationBoostEnabled = remember { mutableStateOf(false) }
-            val eq = remember { mutableStateOf(FloatArray(8)) }
-            val phoneMediaEQ = remember { mutableStateOf(FloatArray(8) { 0.5f }) }
+            val enabled = rememberSaveable { mutableStateOf(false) }
+            val amplificationSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val balanceSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val toneSliderValue = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val ambientNoiseReductionSliderValue = rememberSaveable { mutableFloatStateOf(0.0f) }
+            val conversationBoostEnabled = rememberSaveable { mutableStateOf(false) }
+            val eq = rememberSaveable(
+                saver = Saver(
+                    save = { it.value.toList() },
+                    restore = { mutableStateOf(it.toFloatArray()) }
+                )
+            ) { mutableStateOf(FloatArray(8)) }
+            val phoneMediaEQ = rememberSaveable(
+                saver = Saver(
+                    save = { it.value.toList() },
+                    restore = { mutableStateOf(it.toFloatArray()) }
+                )
+            ) { mutableStateOf(FloatArray(8) { 0.5f }) }
 
-            val initialLoadComplete = remember { mutableStateOf(false) }
-
-            val initialReadSucceeded = remember { mutableStateOf(false) }
-            val initialReadAttempts = remember { mutableIntStateOf(0) }
+            val initialized = rememberSaveable { mutableStateOf(false) }
 
             val transparencySettings = remember {
                 mutableStateOf(
@@ -153,23 +158,9 @@ fun TransparencySettingsScreen(viewModel: AirPodsViewModel) {
                 toneSliderValue.floatValue,
                 conversationBoostEnabled.value,
                 ambientNoiseReductionSliderValue.floatValue,
-                eq.value,
-                initialLoadComplete.value,
-                initialReadSucceeded.value
+                eq.value
             ) {
-                if (!initialLoadComplete.value) {
-                    Log.d(TAG, "Initial device load not complete - skipping send")
-                    return@LaunchedEffect
-                }
-
-                if (!initialReadSucceeded.value) {
-                    Log.d(
-                        TAG,
-                        "Initial device read not successful yet - skipping send until read succeeds"
-                    )
-                    return@LaunchedEffect
-                }
-
+                if (!initialized.value) return@LaunchedEffect
                 transparencySettings.value = TransparencySettings(
                     enabled = enabled.value,
                     leftEQ = eq.value,
@@ -189,59 +180,20 @@ fun TransparencySettingsScreen(viewModel: AirPodsViewModel) {
                 sendTransparencySettings(viewModel::setATTCharacteristicValue, transparencySettings.value)
             }
 
-            LaunchedEffect(Unit) {
-                Log.d(TAG, "Connecting to ATT...")
-                try {
-                    // If we have an AACP manager, prefer its EQ data to populate EQ controls first
-                    try {
-                        Log.d(TAG, "Found AACPManager, reading cached EQ data")
-                        val aacpEQ = state.eqData
-                        if (aacpEQ.isNotEmpty()) {
-                            eq.value = aacpEQ.copyOf()
-                            phoneMediaEQ.value = aacpEQ.copyOf()
-                            Log.d(TAG, "Populated EQ from AACPManager: ${aacpEQ.toList()}")
-                        } else {
-                            Log.d(TAG, "AACPManager EQ data empty")
-                        }
-                    } catch (e: Exception) {
-                        Log.w(TAG, "Error reading EQ from AACPManager: ${e.message}")
-                    }
-
-                    var parsedSettings: TransparencySettings? = null
-                    for (attempt in 1..3) {
-                        initialReadAttempts.intValue = attempt
-                        try {
-                            val data = state.transparencyData
-                            parsedSettings = parseTransparencySettingsResponse(data = data)
-                            Log.d(TAG, "Parsed settings on attempt $attempt")
-                        } catch (e: Exception) {
-                            Log.w(TAG, "Read attempt $attempt failed: ${e.message}")
-                        }
-                        delay(200)
-                    }
-
-                    if (parsedSettings != null) {
-                        Log.d(TAG, "Initial transparency settings: $parsedSettings")
-                        enabled.value = parsedSettings.enabled
-                        amplificationSliderValue.floatValue = parsedSettings.netAmplification
-                        balanceSliderValue.floatValue = parsedSettings.balance
-                        toneSliderValue.floatValue = parsedSettings.leftTone
-                        ambientNoiseReductionSliderValue.floatValue =
-                            parsedSettings.leftAmbientNoiseReduction
-                        conversationBoostEnabled.value = parsedSettings.leftConversationBoost
-                        eq.value = parsedSettings.leftEQ.copyOf()
-                        initialReadSucceeded.value = true
-                    } else {
-                        Log.d(
-                            TAG,
-                            "Failed to read/parse initial transparency settings after ${initialReadAttempts.intValue} attempts"
-                        )
-                    }
-                } catch (e: IOException) {
-                    e.printStackTrace()
-                } finally {
-                    initialLoadComplete.value = true
+            LaunchedEffect(state.transparencyData) {
+                val parsedSettings = parseTransparencySettingsResponse(data = state.transparencyData) ?: return@LaunchedEffect
+                Log.d(TAG, "Initial transparency settings: $parsedSettings")
+                enabled.value = parsedSettings.enabled
+                amplificationSliderValue.floatValue = parsedSettings.netAmplification
+                balanceSliderValue.floatValue = parsedSettings.balance
+                toneSliderValue.floatValue = parsedSettings.leftTone
+                ambientNoiseReductionSliderValue.floatValue =
+                    parsedSettings.leftAmbientNoiseReduction
+                conversationBoostEnabled.value = parsedSettings.leftConversationBoost
+                if (!eq.value.contentEquals(parsedSettings.leftEQ)) {
+                    eq.value = parsedSettings.leftEQ.copyOf()
                 }
+                initialized.value = true
             }
 
             if (state.vendorIdHook) {

android/app/src/main/java/me/kavishdevar/librepods/presentation/screens/UpdateHearingTestScreen.kt

@@ -35,13 +35,14 @@ import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
-import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.Saver
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -57,34 +58,19 @@ import com.kyant.backdrop.backdrops.layerBackdrop
 import com.kyant.backdrop.backdrops.rememberLayerBackdrop
 import dev.chrisbanes.haze.hazeSource
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.delay
 import me.kavishdevar.librepods.R
-import me.kavishdevar.librepods.presentation.components.StyledScaffold
-import me.kavishdevar.librepods.services.ServiceManager
-import me.kavishdevar.librepods.bluetooth.ATTHandles
 import me.kavishdevar.librepods.data.HearingAidSettings
 import me.kavishdevar.librepods.data.parseHearingAidSettingsResponse
 import me.kavishdevar.librepods.data.sendHearingAidSettings
-import java.io.IOException
+import me.kavishdevar.librepods.presentation.components.StyledScaffold
+import me.kavishdevar.librepods.presentation.viewmodel.AirPodsViewModel
 
-private var debounceJob: MutableState<Job?> = mutableStateOf(null)
 private const val TAG = "HearingAidAdjustments"
 
 @Composable
-fun UpdateHearingTestScreen() {
+fun UpdateHearingTestScreen(viewModel: AirPodsViewModel) {
     val verticalScrollState = rememberScrollState()
-    val attManager = ServiceManager.getService()?.attManager
-    if (attManager == null) {
-        Text(
-            text = stringResource(R.string.att_manager_is_null_try_reconnecting),
-            modifier = Modifier
-                .fillMaxSize()
-                .padding(16.dp),
-            textAlign = TextAlign.Center
-        )
-        return
-    }
-
+    val state by viewModel.uiState.collectAsState()
     val backdrop = rememberLayerBackdrop()
     StyledScaffold(
         title = stringResource(R.string.hearing_test)
@@ -112,18 +98,31 @@ fun UpdateHearingTestScreen() {
                 ),
                 textAlign = TextAlign.Center,
             )
-            val tone = remember { mutableFloatStateOf(0.5f) }
-            val ambientNoiseReduction = remember { mutableFloatStateOf(0.0f) }
-            val ownVoiceAmplification = remember { mutableFloatStateOf(0.5f) }
-            val leftAmplification = remember { mutableFloatStateOf(0.5f) }
-            val rightAmplification = remember { mutableFloatStateOf(0.5f) }
-            val conversationBoostEnabled = remember { mutableStateOf(false) }
-            val leftEQ = remember { mutableStateOf(FloatArray(8)) }
-            val rightEQ = remember { mutableStateOf(FloatArray(8)) }
+            val tone = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val ambientNoiseReduction = rememberSaveable { mutableFloatStateOf(0.0f) }
+            val ownVoiceAmplification = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val leftAmplification = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val rightAmplification = rememberSaveable { mutableFloatStateOf(0.5f) }
+            val conversationBoostEnabled = rememberSaveable { mutableStateOf(false) }
+            val leftEQ = rememberSaveable(
+                saver = Saver(
+                    save = { it.value.toList() },
+                    restore = { mutableStateOf(it.toFloatArray()) }
+                )
+            ) {
+                mutableStateOf(FloatArray(8))
+            }
+            val rightEQ = rememberSaveable(
+                saver = Saver(
+                    save = { it.value.toList() },
+                    restore = { mutableStateOf(it.toFloatArray()) }
+                )
+            ) {
+                mutableStateOf(FloatArray(8))
+            }
 
-            val initialLoadComplete = remember { mutableStateOf(false) }
-            val initialReadSucceeded = remember { mutableStateOf(false) }
-            val initialReadAttempts = remember { mutableIntStateOf(0) }
+            val debounceJob = remember { mutableStateOf<Job?>(null) }
+            val initialized = rememberSaveable { mutableStateOf(false) }
 
             val hearingAidSettings = remember {
                 mutableStateOf(
@@ -145,31 +144,21 @@ fun UpdateHearingTestScreen() {
                 )
             }
 
-            val hearingAidATTListener = remember {
-                object : (ByteArray) -> Unit {
-                    override fun invoke(value: ByteArray) {
-                        val parsed = parseHearingAidSettingsResponse(value)
-                        if (parsed != null) {
-                            leftEQ.value = parsed.leftEQ.copyOf()
-                            rightEQ.value = parsed.rightEQ.copyOf()
-                            conversationBoostEnabled.value = parsed.leftConversationBoost
-                            tone.floatValue = parsed.leftTone
-                            ambientNoiseReduction.floatValue = parsed.leftAmbientNoiseReduction
-                            ownVoiceAmplification.floatValue = parsed.ownVoiceAmplification
-                            leftAmplification.floatValue = parsed.leftAmplification
-                            rightAmplification.floatValue = parsed.rightAmplification
-                            Log.d(TAG, "Updated hearing aid settings from notification")
-                        } else {
-                            Log.w(TAG, "Failed to parse hearing aid settings from notification")
-                        }
-                    }
-                }
-            }
-
-
-            DisposableEffect(Unit) {
-                onDispose {
-                    attManager.unregisterListener(ATTHandles.HEARING_AID, hearingAidATTListener)
+            LaunchedEffect(state.hearingAidData) {
+                val parsed = parseHearingAidSettingsResponse(state.hearingAidData)
+                if (parsed != null) {
+                    leftEQ.value = parsed.leftEQ.copyOf()
+                    rightEQ.value = parsed.rightEQ.copyOf()
+                    conversationBoostEnabled.value = parsed.leftConversationBoost
+                    tone.floatValue = parsed.leftTone
+                    ambientNoiseReduction.floatValue = parsed.leftAmbientNoiseReduction
+                    ownVoiceAmplification.floatValue = parsed.ownVoiceAmplification
+                    leftAmplification.floatValue = parsed.leftAmplification
+                    rightAmplification.floatValue = parsed.rightAmplification
+                    initialized.value = true
+                    Log.d(TAG, "Updated hearing aid settings from notification")
+                } else {
+                    Log.w(TAG, "Failed to parse hearing aid settings from notification")
                 }
             }
 
@@ -177,27 +166,13 @@ fun UpdateHearingTestScreen() {
                 leftEQ.value,
                 rightEQ.value,
                 conversationBoostEnabled.value,
-                initialLoadComplete.value,
-                initialReadSucceeded.value,
                 leftAmplification.floatValue,
                 rightAmplification.floatValue,
                 tone.floatValue,
                 ambientNoiseReduction.floatValue,
                 ownVoiceAmplification.floatValue
             ) {
-                if (!initialLoadComplete.value) {
-                    Log.d(TAG, "Initial device load not complete - skipping send")
-                    return@LaunchedEffect
-                }
-
-                if (!initialReadSucceeded.value) {
-                    Log.d(
-                        TAG,
-                        "Initial device read not successful yet - skipping send until read succeeds"
-                    )
-                    return@LaunchedEffect
-                }
-
+                if (!initialized.value) return@LaunchedEffect
                 hearingAidSettings.value = HearingAidSettings(
                     leftEQ = leftEQ.value,
                     rightEQ = rightEQ.value,
@@ -214,55 +189,7 @@ fun UpdateHearingTestScreen() {
                     ownVoiceAmplification = ownVoiceAmplification.floatValue
                 )
                 Log.d(TAG, "Updated settings: ${hearingAidSettings.value}")
-                sendHearingAidSettings(attManager, hearingAidSettings.value, debounceJob)
-            }
-
-            LaunchedEffect(Unit) {
-                Log.d(TAG, "Connecting to ATT...")
-                try {
-                    attManager.enableNotifications(ATTHandles.HEARING_AID)
-                    attManager.registerListener(ATTHandles.HEARING_AID, hearingAidATTListener)
-
-                    var parsedSettings: HearingAidSettings? = null
-                    for (attempt in 1..3) {
-                        initialReadAttempts.intValue = attempt
-                        try {
-                            val data = attManager.read(ATTHandles.HEARING_AID)
-                            parsedSettings = parseHearingAidSettingsResponse(data = data)
-                            if (parsedSettings != null) {
-                                Log.d(TAG, "Parsed settings on attempt $attempt")
-                                break
-                            } else {
-                                Log.d(TAG, "Parsing returned null on attempt $attempt")
-                            }
-                        } catch (e: Exception) {
-                            Log.w(TAG, "Read attempt $attempt failed: ${e.message}")
-                        }
-                        delay(200)
-                    }
-
-                    if (parsedSettings != null) {
-                        Log.d(TAG, "Initial hearing aid settings: $parsedSettings")
-                        leftEQ.value = parsedSettings.leftEQ.copyOf()
-                        rightEQ.value = parsedSettings.rightEQ.copyOf()
-                        conversationBoostEnabled.value = parsedSettings.leftConversationBoost
-                        tone.floatValue = parsedSettings.leftTone
-                        ambientNoiseReduction.floatValue = parsedSettings.leftAmbientNoiseReduction
-                        ownVoiceAmplification.floatValue = parsedSettings.ownVoiceAmplification
-                        leftAmplification.floatValue = parsedSettings.leftAmplification
-                        rightAmplification.floatValue = parsedSettings.rightAmplification
-                        initialReadSucceeded.value = true
-                    } else {
-                        Log.d(
-                            TAG,
-                            "Failed to read/parse initial hearing aid settings after ${initialReadAttempts.intValue} attempts"
-                        )
-                    }
-                } catch (e: IOException) {
-                    e.printStackTrace()
-                } finally {
-                    initialLoadComplete.value = true
-                }
+                sendHearingAidSettings(state.hearingAidData, hearingAidSettings.value, debounceJob, viewModel::setATTCharacteristicValue)
             }
 
             val frequencies =

android/app/src/main/java/me/kavishdevar/librepods/presentation/viewmodel/AirPodsViewModel.kt

@@ -29,15 +29,16 @@ import androidx.core.content.edit
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import me.kavishdevar.librepods.BuildConfig
 import me.kavishdevar.librepods.billing.BillingManager
 import me.kavishdevar.librepods.bluetooth.AACPManager
 import me.kavishdevar.librepods.bluetooth.AACPManager.Companion.ControlCommandIdentifiers
+import me.kavishdevar.librepods.bluetooth.ATTCCCDHandles
 import me.kavishdevar.librepods.bluetooth.ATTHandles
 import me.kavishdevar.librepods.data.AirPodsInstance
 import me.kavishdevar.librepods.data.AirPodsModels
@@ -93,7 +94,8 @@ data class AirPodsUiState(
 
     val dynamicEndOfCharge: Boolean = false,
 
-    val connectionSuccessful: Boolean = false
+    val connectionSuccessful: Boolean = false,
+    val timeUntilFOSSPremiumExpiry: Long = 0L
 )
 
 class AirPodsViewModel(
@@ -142,9 +144,11 @@ class AirPodsViewModel(
         loadInstance()
         loadSharedPreferences()
         setupControlObservers()
-        observeBilling()
         loadControlList()
+        loadATT()
         observeATT()
+        observeSharedPreferences()
+        observeBilling()
         if (isDemoMode) activateDemoMode()
     }
 
@@ -172,18 +176,38 @@ class AirPodsViewModel(
 //                    billingFirstCollectDone = true
 //                    return@collect
 //                }
-                if (!premium) {
-                    setControlCommandBoolean(
-                        ControlCommandIdentifiers.CONVERSATION_DETECT_CONFIG,
-                        false
-                    )
-                    setHeadGesturesEnabled(false)
+                if (premium) {
+                    sharedPreferences.edit {
+                        remove("premium_expiry_time")
+                        remove("foss_upgraded")
+                    }
+                    _uiState.update { it.copy(isPremium = true, timeUntilFOSSPremiumExpiry = 0L) }
+                } else {
+                    if (_uiState.value.timeUntilFOSSPremiumExpiry <= 0L) {
+                        setControlCommandBoolean(
+                            ControlCommandIdentifiers.CONVERSATION_DETECT_CONFIG,
+                            false
+                        )
+                        setHeadGesturesEnabled(false)
+                        _uiState.update { it.copy(isPremium = false) }
+                    }
                 }
-                _uiState.update { it.copy(isPremium = premium) }
             }
         }
     }
 
+    private fun observeSharedPreferences() {
+        val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
+            when (key) {
+                "name" -> loadName()
+                "off_listening_mode", "automatic_ear_detection", "automatic_connection_ctrl_cmd",
+                "head_gestures", "left_long_press_action", "right_long_press_action",
+                "dynamic_end_of_charge", "foss_upgraded", "premium_expiry_time" -> loadSharedPreferences()
+            }
+        }
+        sharedPreferences.registerOnSharedPreferenceChangeListener(listener)
+    }
+
     private fun observeBroadcasts() {
         broadcastReceiver = object : BroadcastReceiver() {
             override fun onReceive(context: Context?, intent: Intent?) {
@@ -358,6 +382,7 @@ class AirPodsViewModel(
 
         val connectionSuccessful = sharedPreferences.getBoolean("connection_successful", false)
 
+        val fossUpgraded = sharedPreferences.getBoolean("foss_upgraded", false)
         _uiState.update {
             it.copy(
                 offListeningMode = offListeningModeEnabled,
@@ -368,9 +393,56 @@ class AirPodsViewModel(
                 rightAction = rightAction,
                 vendorIdHook = vendorIdHook,
                 dynamicEndOfCharge = dynamicEndOfCharge,
-                connectionSuccessful = connectionSuccessful
+                connectionSuccessful = connectionSuccessful,
             )
         }
+
+        // faulty update on Play caused PLAY_BUILD to be false and resulted in use of FOSS billing in Play. since FOSS is not verified, we need to give 2 weeks to verify the purchase
+
+        val expiryTime = sharedPreferences.getLong("premium_expiry_time", 0L)
+        val now = System.currentTimeMillis()
+
+        when {
+            // existing temporary premium
+            expiryTime > 0L -> {
+                if (expiryTime <= now) {
+                    sharedPreferences.edit {
+                        remove("premium_expiry_time")
+                        remove("foss_upgraded")
+                    }
+
+                    _uiState.update {
+                        it.copy(
+                            timeUntilFOSSPremiumExpiry = 0L,
+                            isPremium = false
+                        )
+                    }
+                } else {
+                    _uiState.update {
+                        it.copy(
+                            timeUntilFOSSPremiumExpiry = expiryTime - now,
+                            isPremium = true
+                        )
+                    }
+                }
+            }
+
+            // First migration from accidental FOSS Play build
+            fossUpgraded && !_uiState.value.isPremium && BuildConfig.PLAY_BUILD -> {
+                val newExpiry = now + 28L * 24 * 60 * 60 * 1000
+
+                sharedPreferences.edit {
+                    putLong("premium_expiry_time", newExpiry)
+                }
+
+                _uiState.update {
+                    it.copy(
+                        timeUntilFOSSPremiumExpiry = newExpiry - now,
+                        isPremium = true
+                    )
+                }
+            }
+        }
     }
 
     fun setOffListeningMode(enabled: Boolean) {
@@ -454,51 +526,69 @@ class AirPodsViewModel(
     }
 
     fun setATTCharacteristicValue(handle: ATTHandles, value: ByteArray) {
-        if (handle == ATTHandles.LOUD_SOUND_REDUCTION) {
-            _uiState.update { it.copy(loudSoundReductionEnabled = value[0].toInt() == 0x01) }
+        when (handle) {
+            // ideally should be using a different viewmodel for ATT based things because there are a lot of values, and I am not going to add all to this state, but there's loudsoundreduction.
+            ATTHandles.LOUD_SOUND_REDUCTION -> {
+                _uiState.value = _uiState.value.copy(loudSoundReductionEnabled = value[0].toInt() == 0x01)
+            }
+            ATTHandles.HEARING_AID -> {
+                _uiState.value = _uiState.value.copy(hearingAidData = value)
+            }
+            ATTHandles.TRANSPARENCY -> {
+                _uiState.value = _uiState.value.copy(transparencyData = value)
+            }
         }
         viewModelScope.launch(Dispatchers.IO) {
             try {
-                service.attManager?.connect()
-                while (service.attManager?.socket?.isConnected != true) {
-                    delay(250)
-                }
-                service.attManager?.write(handle, value)
+                service.attManager.writeCharacteristic(handle, value)
             } catch (e: Exception) {
                 e.printStackTrace()
             }
         }
     }
 
-    fun refreshATT() {
-        viewModelScope.launch(Dispatchers.IO) {
-            val loudSoundReduction =
-                runCatching { service.attManager?.read(ATTHandles.LOUD_SOUND_REDUCTION) }.getOrNull()
-            val transparencyData =
-                runCatching { service.attManager?.read(ATTHandles.TRANSPARENCY) }.getOrNull()?: byteArrayOf()
-            val hearingAid =
-                runCatching { service.attManager?.read(ATTHandles.HEARING_AID) }.getOrNull()?: byteArrayOf()
-            _uiState.value = _uiState.value.copy(
-                loudSoundReductionEnabled = loudSoundReduction?.get(0)?.toInt() == 0x01,
+    fun loadATT() {
+        val loudSoundReduction = service.attManager.getCharacteristic(ATTHandles.LOUD_SOUND_REDUCTION) ?: byteArrayOf()
+        val loudSoundReductionEnabled = if (loudSoundReduction.isNotEmpty()) {
+            loudSoundReduction[0].toInt() == 1
+        } else false
+        val hearingAidData = service.attManager.getCharacteristic(ATTHandles.HEARING_AID) ?: byteArrayOf()
+        val transparencyData = service.attManager.getCharacteristic(ATTHandles.TRANSPARENCY) ?: byteArrayOf()
+        _uiState.update {
+            it.copy(
+                loudSoundReductionEnabled = loudSoundReductionEnabled,
                 transparencyData = transparencyData,
-                hearingAidData = hearingAid
+                hearingAidData = hearingAidData
             )
         }
     }
 
     fun observeATT() {
         viewModelScope.launch(Dispatchers.IO) {
-            service.attManager?.connect()
-            while (service.attManager?.socket?.isConnected != true) {
-                delay(1000)
-            }
-            service.attManager?.enableNotifications(ATTHandles.LOUD_SOUND_REDUCTION)
-            service.attManager?.enableNotifications(ATTHandles.TRANSPARENCY)
-            service.attManager?.enableNotifications(ATTHandles.HEARING_AID)
-
-            while (true) {
-                refreshATT()
-                delay(15000)
+            service.attManager.enableNotification(ATTCCCDHandles.HEARING_AID)
+            service.attManager.enableNotification(ATTCCCDHandles.TRANSPARENCY)
+//            service.attManager.enableNotification(ATTCCCDHandles.LOUD_SOUND_REDUCTION)
+        }
+        service.attManager.setOnNotificationReceived { handle, value ->
+            when (handle) {
+                ATTHandles.LOUD_SOUND_REDUCTION.value.toByte() -> {
+                    val loudSoundReductionEnabled = if (value.isNotEmpty()) {
+                        value[0].toInt() == 1
+                    } else false
+                    _uiState.update {
+                        it.copy(loudSoundReductionEnabled = loudSoundReductionEnabled)
+                    }
+                }
+                ATTHandles.HEARING_AID.value.toByte() -> {
+                    _uiState.update {
+                        it.copy(hearingAidData = value)
+                    }
+                }
+                ATTHandles.TRANSPARENCY.value.toByte() -> {
+                    _uiState.update {
+                        it.copy(transparencyData = value)
+                    }
+                }
             }
         }
     }

android/app/src/main/java/me/kavishdevar/librepods/presentation/viewmodel/AppSettingsViewModel.kt

@@ -10,6 +10,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import me.kavishdevar.librepods.BuildConfig
 import me.kavishdevar.librepods.billing.BillingManager
 import me.kavishdevar.librepods.data.XposedRemotePrefProvider
 import kotlin.math.roundToInt
@@ -34,7 +35,8 @@ data class AppSettingsUiState(
     val isPremium: Boolean = false,
     val connectionSuccessful: Boolean = false,
     val showBottomSheetPopup: Boolean = true,
-    val showIslandPopup: Boolean = true
+    val showIslandPopup: Boolean = true,
+    val timeUntilFOSSPremiumExpiry: Long = 0L
 )
 
 class AppSettingsViewModel(application: Application) : AndroidViewModel(application) {
@@ -66,12 +68,71 @@ class AppSettingsViewModel(application: Application) : AndroidViewModel(applicat
     private fun observeBilling() {
         viewModelScope.launch {
             BillingManager.provider.isPremium.collect { premium ->
-                _uiState.update { it.copy(isPremium = premium) }
+                if (premium) {
+                    sharedPreferences.edit {
+                        remove("premium_expiry_time")
+                        remove("foss_upgraded")
+                    }
+                    _uiState.update { it.copy(isPremium = true, timeUntilFOSSPremiumExpiry = 0L) }
+                } else {
+                    // No billing premium, only update if no temporary premium is active
+                    if (_uiState.value.timeUntilFOSSPremiumExpiry <= 0L) {
+                        _uiState.update { it.copy(isPremium = false) }
+                    }
+                }
             }
         }
     }
 
     private fun loadSettings() {
+        // faulty update on Play caused PLAY_BUILD to be false and resulted in use of FOSS billing in Play. since FOSS is not verified, we need to give 2 weeks to verify the purchase
+
+        val fossUpgraded = sharedPreferences.getBoolean("foss_upgraded", false)
+        val expiryTime = sharedPreferences.getLong("premium_expiry_time", 0L)
+        val now = System.currentTimeMillis()
+
+        when {
+            // existing temporary premium
+            expiryTime > 0L -> {
+                if (expiryTime <= now) {
+                    sharedPreferences.edit {
+                        remove("premium_expiry_time")
+                        remove("foss_upgraded")
+                    }
+
+                    _uiState.update {
+                        it.copy(
+                            timeUntilFOSSPremiumExpiry = 0L,
+                            isPremium = false
+                        )
+                    }
+                } else {
+                    _uiState.update {
+                        it.copy(
+                            timeUntilFOSSPremiumExpiry = expiryTime - now,
+                            isPremium = true
+                        )
+                    }
+                }
+            }
+
+            // First migration from accidental FOSS Play build
+            fossUpgraded && !_uiState.value.isPremium && BuildConfig.PLAY_BUILD -> {
+                val newExpiry = now + 28L * 24 * 60 * 60 * 1000
+
+                sharedPreferences.edit {
+                    putLong("premium_expiry_time", newExpiry)
+                }
+
+                _uiState.update {
+                    it.copy(
+                        timeUntilFOSSPremiumExpiry = newExpiry - now,
+                        isPremium = true
+                    )
+                }
+            }
+        }
+
         _uiState.update { currentState ->
             currentState.copy(
                 showPhoneBatteryInWidget = sharedPreferences.getBoolean("show_phone_battery_in_widget", false),

android/app/src/main/java/me/kavishdevar/librepods/services/AirPodsService.kt

@@ -85,7 +85,9 @@ import me.kavishdevar.librepods.MainActivity
 import me.kavishdevar.librepods.R
 import me.kavishdevar.librepods.bluetooth.AACPManager
 import me.kavishdevar.librepods.bluetooth.AACPManager.Companion.StemPressType
-import me.kavishdevar.librepods.bluetooth.ATTManager
+import me.kavishdevar.librepods.bluetooth.ATTCCCDHandles
+import me.kavishdevar.librepods.bluetooth.ATTHandles
+import me.kavishdevar.librepods.bluetooth.ATTManagerv2
 import me.kavishdevar.librepods.bluetooth.BLEManager
 import me.kavishdevar.librepods.bluetooth.BluetoothConnectionManager
 import me.kavishdevar.librepods.data.AirPodsInstance
@@ -126,9 +128,9 @@ import me.kavishdevar.librepods.utils.SystemApisUtils.METADATA_UNTETHERED_RIGHT_
 import me.kavishdevar.librepods.utils.SystemApisUtils.METADATA_UNTETHERED_RIGHT_LOW_BATTERY_THRESHOLD
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
-import java.time.LocalDateTime
 import kotlin.io.encoding.Base64
 import kotlin.io.encoding.ExperimentalEncodingApi
+import kotlin.time.Duration.Companion.milliseconds
 
 private const val TAG = "AirPodsService"
 
@@ -151,7 +153,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
     var macAddress = ""
     var localMac = ""
     lateinit var aacpManager: AACPManager
-    var attManager: ATTManager? = null
+    lateinit var attManager: ATTManagerv2
     var airpodsInstance: AirPodsInstance? = null
     var cameraActive = false
     private var disconnectedBecauseReversed = false
@@ -380,6 +382,8 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
         aacpManager = AACPManager()
         initializeAACPManagerCallback()
 
+        attManager = ATTManagerv2()
+
         sharedPreferences.registerOnSharedPreferenceChangeListener(this)
 
         localMac = config.selfMacAddress
@@ -654,6 +658,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
             addAction("android.bluetooth.headset.action.VENDOR_SPECIFIC_HEADSET_EVENT")
             addAction("android.bluetooth.a2dp.profile.action.CONNECTION_STATE_CHANGED")
             addAction("android.bluetooth.a2dp.profile.action.PLAYING_STATE_CHANGED")
+            addAction("android.bluetooth.device.action.UUID")
         }
 
         connectionReceiver = object : BroadcastReceiver() {
@@ -691,8 +696,9 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
 //                    isConnectedLocally = false
                     popupShown = false
                     updateNotificationContent(false)
-                    attManager?.disconnect()
-                    attManager = null
+                    aacpManager.disconnected()
+                    attManager.disconnected()
+                    BluetoothConnectionManager.setCurrentConnection(null, null)
                 }
             }
         }
@@ -1019,7 +1025,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
                 )
                 // Store in SharedPreferences
                 sharedPreferences.edit {
-                    putString("airpods_name", deviceInformation.name)
+                    putString("name", deviceInformation.name)
                     putString("airpods_model_number", deviceInformation.modelNumber)
                     putString("airpods_manufacturer", deviceInformation.manufacturer)
                     putString("airpods_serial_number", deviceInformation.serialNumber)
@@ -1094,9 +1100,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
                     "Stem press received: $stemPressType on $bud, cameraActive: $cameraActive, cameraAction: ${config.cameraAction}"
                 )
                 if (cameraActive && config.cameraAction != null && stemPressType == config.cameraAction) {
-                    if (BuildConfig.FLAVOR == "xposed") {
                         Runtime.getRuntime().exec(arrayOf("su", "-c", "input keyevent 27"))
-                    }
                 } else {
                     val action = getActionFor(bud, stemPressType)
                     Log.d("AirPodsParser", "$bud $stemPressType action: $action")
@@ -2390,16 +2394,27 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
                 ?.getString("name", bluetoothDevice?.name)
             if (bluetoothDevice != null && !action.isNullOrEmpty()) {
                 Log.d(TAG, "Received bluetooth connection broadcast: action=$action")
+                val uuid = ParcelUuid.fromString("74ec2172-0bad-4d01-8f77-997b2be0722a")
+
                 if (BluetoothDevice.ACTION_ACL_CONNECTED == action) {
-                    val uuid = ParcelUuid.fromString("74ec2172-0bad-4d01-8f77-997b2be0722a")
-                    bluetoothDevice.fetchUuidsWithSdp()
-                    if (bluetoothDevice.uuids != null) {
-                        if (bluetoothDevice.uuids.contains(uuid)) {
-                            val intent = Intent(AirPodsNotifications.AIRPODS_CONNECTION_DETECTED)
-                            intent.putExtra("name", name)
-                            intent.putExtra("device", bluetoothDevice)
-                            context?.sendBroadcast(intent)
-                        }
+                    if (bluetoothDevice.uuids?.contains(uuid) == true) {
+                        val intent = Intent(AirPodsNotifications.AIRPODS_CONNECTION_DETECTED)
+                        intent.putExtra("name", name)
+                        intent.putExtra("device", bluetoothDevice)
+                        context?.sendBroadcast(intent)
+                    } else {
+                        bluetoothDevice.fetchUuidsWithSdp()
+                    }
+                } else if ("android.bluetooth.device.action.UUID" == action) {
+                    val savedMac = context?.getSharedPreferences("settings", MODE_PRIVATE)
+                        ?.getString("mac_address", "") ?: ""
+                    val matchedByMac = savedMac.isNotEmpty() && bluetoothDevice.address == savedMac
+                    val matchedByUuid = bluetoothDevice.uuids?.contains(uuid) == true
+                    if (matchedByUuid || matchedByMac) {
+                        val intent = Intent(AirPodsNotifications.AIRPODS_CONNECTION_DETECTED)
+                        intent.putExtra("name", name)
+                        intent.putExtra("device", bluetoothDevice)
+                        context?.sendBroadcast(intent)
                     }
                 }
             }
@@ -2612,15 +2627,15 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
     }
 
     private fun createBluetoothSocket(
-        adapter: BluetoothAdapter, device: BluetoothDevice, uuid: ParcelUuid
+        adapter: BluetoothAdapter, device: BluetoothDevice, uuid: ParcelUuid, psm: Int
     ): BluetoothSocket {
         val type = 3 // L2CAP
         val constructorSpecs = listOf(
-            arrayOf(adapter, device, type, true, true, 0x1001, uuid), // A16QPR3
-            arrayOf(device, type, true, true, 0x1001, uuid),
-            arrayOf(device, type, 1, true, true, 0x1001, uuid),
-            arrayOf(type, 1, true, true, device, 0x1001, uuid),
-            arrayOf(type, true, true, device, 0x1001, uuid)
+            arrayOf(adapter, device, type, true, true, psm, uuid), // A16QPR3
+            arrayOf(device, type, true, true, psm, uuid),
+            arrayOf(device, type, 1, true, true, psm, uuid),
+            arrayOf(type, 1, true, true, device, psm, uuid),
+            arrayOf(type, true, true, device, psm, uuid)
         )
 
         val constructors = BluetoothSocket::class.java.declaredConstructors
@@ -2666,7 +2681,7 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
         val uuid: ParcelUuid = ParcelUuid.fromString("74ec2172-0bad-4d01-8f77-997b2be0722a")
 //        if (!isConnectedLocally) {
         socket = try {
-            createBluetoothSocket(adapter, device, uuid)
+            createBluetoothSocket(adapter, device, uuid, 4097)
         } catch (e: Exception) {
             Log.e(TAG, "Failed to create BluetoothSocket: ${e.message}")
             showSocketConnectionFailureNotification("Failed to create Bluetooth socket: ${e.localizedMessage}")
@@ -2675,17 +2690,30 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
 
         try {
             runBlocking {
-                withTimeout(5000L) {
+                withTimeout(5000.milliseconds) {
                     try {
                         socket.connect()
 //                            isConnectedLocally = true
                         this@AirPodsService.device = device
-
-                        BluetoothConnectionManager.setCurrentConnection(socket, device)
                         val xposedRemotePref = XposedRemotePrefProvider.create()
-                        if (xposedRemotePref.getBoolean("vendor_id_hook", false)) {
-                            attManager = ATTManager(adapter, device)
-                            attManager!!.connect()
+                        val attSocket = if (xposedRemotePref.getBoolean("vendor_id_hook", false)) {
+                            createBluetoothSocket(
+                                adapter,
+                                device,
+                                ParcelUuid.fromString("00000000-0000-0000-0000-000000000000"),
+                                31
+                            )
+                        } else null
+                        attSocket?.connect()
+                        BluetoothConnectionManager.setCurrentConnection(socket, attSocket)
+                        if (attSocket != null) {
+                            attManager.startReader()
+                            attManager.readCharacteristic(ATTHandles.LOUD_SOUND_REDUCTION)
+                            attManager.readCharacteristic(ATTHandles.TRANSPARENCY)
+                            attManager.readCharacteristic(ATTHandles.HEARING_AID)
+                            attManager.enableNotification(ATTCCCDHandles.HEARING_AID)
+//                            attManager.enableNotification(ATTCCCDHandles.LOUD_SOUND_REDUCTION)
+                            attManager.enableNotification(ATTCCCDHandles.TRANSPARENCY)
                         }
 
                         // Create AirPodsInstance from stored config if available
@@ -2891,7 +2919,8 @@ class AirPodsService : Service(), SharedPreferences.OnSharedPreferenceChangeList
         socket.close()
 //        isConnectedLocally = false
         aacpManager.disconnected()
-        attManager?.disconnect()
+        attManager.disconnected()
+        BluetoothConnectionManager.setCurrentConnection(null, null)
         updateNotificationContent(false)
         sendBroadcast(Intent(AirPodsNotifications.AIRPODS_DISCONNECTED).apply {
             setPackage(packageName)

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

@@ -276,4 +276,5 @@
     <string name="optimized_charging">Optimized Charge Limit</string>
     <string name="optimized_charging_description">AirPods can learn from your daily usage and determine when to charge to an optmized limit and when to allow or full charge. This limit adapts to your daily usage and preserves your battery lifespan over time.\nThis setting may not affect unsupported AirPods, or AirPods on an older firmware version.</string>
     <string name="enable_app_in_xposed_or_update_device">Enable LibrePods in Xposed or update your device to proceed.</string>
+    <string name="play_foss_premium_banner">Due to an error in billing, premium access will expire in %1$d days. If you already upgraded the app, please click on this message to email billing@kavish.xyz to restore or verify access. Apologies for the inconvenience.</string>
 </resources>