made seperate BLE class
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@@ -0,0 +1,145 @@
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package com.example.smart_watch_android.BLE
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import android.Manifest
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import android.app.Activity
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import android.bluetooth.BluetoothAdapter
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import android.bluetooth.BluetoothGatt
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import android.bluetooth.BluetoothGattCallback
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import android.bluetooth.BluetoothGattCharacteristic
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import android.bluetooth.BluetoothManager
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import android.bluetooth.BluetoothProfile
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import android.content.Context
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import android.content.pm.PackageManager
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import android.os.Build
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import android.util.Log
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import androidx.annotation.RequiresApi
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import androidx.annotation.RequiresPermission
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.setValue
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import androidx.core.app.ActivityCompat
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class BleManager(private val context: Context) {
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val deviceUUIDs = DeviceUUIDs
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private var bluetoothGatt: BluetoothGatt? = null
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private var bluetoothManager: BluetoothManager? = null
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private var bluetoothAdapter: BluetoothAdapter? = null
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var isConnected by mutableStateOf(false)
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private set
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fun init() {
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bluetoothManager = context.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
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bluetoothAdapter = bluetoothManager?.adapter
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}
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@RequiresApi(Build.VERSION_CODES.S)
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fun checkAndRequestBluetoothPermissions() {
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val permissions = arrayOf(
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Manifest.permission.BLUETOOTH_CONNECT,
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Manifest.permission.BLUETOOTH_SCAN,
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Manifest.permission.ACCESS_FINE_LOCATION
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)
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// Prüfen, ob die Berechtigungen bereits erteilt wurden
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val missingPermissions = permissions.filter {
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ActivityCompat.checkSelfPermission(context, it) != PackageManager.PERMISSION_GRANTED
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}
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if (missingPermissions.isNotEmpty()) {
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// Wenn Berechtigungen fehlen, frage den Nutzer danach
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ActivityCompat.requestPermissions(context as Activity, missingPermissions.toTypedArray(), 101)
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}
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}
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fun connectToEsp32(deviceAddress: String) {
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Log.d("ESP32_BLE", "1. connectToEsp32 gestartet mit Adresse: $deviceAddress")
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if (bluetoothAdapter == null) {
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Log.d("ESP32_BLE", "Fehler: Bluetooth wird von diesem Gerät nicht unterstützt!")
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return
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}
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try {
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val device = bluetoothAdapter!!.getRemoteDevice(deviceAddress)
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Log.d("ESP32_BLE", "2. BluetoothDevice Objekt erfolgreich erstellt.")
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val gattCallback = object : BluetoothGattCallback() {
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@RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
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override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
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Log.d("ESP32_BLE", "3. onConnectionStateChange aufgerufen! Status: $status, NewState: $newState")
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if (status == BluetoothGatt.GATT_SUCCESS) {
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if (newState == BluetoothProfile.STATE_CONNECTED) {
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Log.d("ESP32_BLE", "4. Verbunden! Starte discoverServices()...")
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gatt.discoverServices()
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} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
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Log.d("ESP32_BLE", "5. Getrennt worden.")
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isConnected = false
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gatt.close()
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bluetoothGatt = null
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}
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} else {
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Log.d("ESP32_BLE", "Fehler in onConnectionStateChange! Status-Code: $status")
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isConnected = false
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}
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}
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override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
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Log.d("ESP32_BLE", "6. onServicesDiscovered aufgerufen mit Status: $status")
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if (status == BluetoothGatt.GATT_SUCCESS) {
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isConnected = true
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writeToEsp32("Hallo ESP32")
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Log.d("ESP32_BLE", "7. Services erfolgreich gefunden! Verbindung komplett erfolgreich.")
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}
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}
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}
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// Berechtigungsprüfung
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if (ActivityCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
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Log.d("ESP32_BLE", "8. Berechtigung vorhanden, rufe connectGatt auf...")
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bluetoothGatt = device.connectGatt(context, false, gattCallback)
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} else {
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Log.d("ESP32_BLE", "FEHLER: Keine BLUETOOTH_CONNECT Berechtigung erteilt!")
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}
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} catch (e: Exception) {
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Log.d("ESP32_BLE", "Exception gefangen: ${e.message}")
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}
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}
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fun writeToEsp32(dataString: String) {
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// Prüfen, ob die Verbindung steht und bluetoothGatt nicht null ist
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val gatt = bluetoothGatt
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if (gatt == null) {
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Log.d("ESP32_BLE", "Fehler: Kein GATT-Objekt vorhanden (nicht verbunden).")
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return
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}
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// 1. Service holen
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val service = gatt.getService(deviceUUIDs.SERVICE_UUID)
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if (service == null) {
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Log.d("ESP32_BLE", "Fehler: Service UUID nicht gefunden!")
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return
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}
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// 2. Characteristic holen
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val characteristic = service.getCharacteristic(deviceUUIDs.TIME_CHARACTERISTIC_UUID)
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if (characteristic == null) {
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Log.d("ESP32_BLE", "Fehler: Characteristic UUID nicht gefunden!")
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return
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}
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// 3. Daten in Bytes umwandeln (z.B. einen String wie "LED_ON" in UTF-8 Bytes)
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val bytes = dataString.toByteArray(Charsets.UTF_8)
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characteristic.value = bytes
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// 4. Schreibtyp festlegen ( WRITE_TYPE_DEFAULT wartet auf Antwort vom ESP32, WRITE_TYPE_NO_RESPONSE ist schneller )
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characteristic.writeType = BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT
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// 5. Berechtigung prüfen und Schreibvorgang starten
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if (ActivityCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
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val success = gatt.writeCharacteristic(characteristic)
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Log.d("ESP32_BLE", "Schreibvorgang gestartet: $success")
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}
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}
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}
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@@ -0,0 +1,8 @@
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package com.example.smart_watch_android.BLE
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import java.util.UUID
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object DeviceUUIDs {
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val SERVICE_UUID = UUID.fromString("791cadd7-de87-49f9-8986-94b7ae11940b")
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val TIME_CHARACTERISTIC_UUID = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e02")
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}
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@@ -1,10 +1,9 @@
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package com.example.smart_watch_android
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import android.Manifest
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import android.app.Application
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import android.bluetooth.BluetoothDevice
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import android.bluetooth.BluetoothGatt
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import android.bluetooth.BluetoothGattCallback
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import android.bluetooth.BluetoothGattCharacteristic
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import android.bluetooth.BluetoothManager
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import android.bluetooth.BluetoothProfile
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import android.content.Context
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@@ -17,156 +16,26 @@ import androidx.activity.compose.setContent
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import androidx.activity.enableEdgeToEdge
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import androidx.annotation.RequiresApi
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import androidx.annotation.RequiresPermission
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.padding
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import androidx.compose.material3.Scaffold
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.tooling.preview.Preview
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import androidx.core.app.ActivityCompat
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import com.example.smart_watch_android.ui.theme.SmartWatchAndroidTheme
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import java.util.UUID
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import com.example.smart_watch_android.BLE.BleManager
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class MainActivity : ComponentActivity() {
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private var bluetoothGatt: BluetoothGatt? = null
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var isConnected by mutableStateOf(false)
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private set
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private val SERVICE_UUID = UUID.fromString("791cadd7-de87-49f9-8986-94b7ae11940b")
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private val CHARACTERISTIC_UUID = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e02")
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val bleManager = BleManager(context = this)
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@RequiresApi(Build.VERSION_CODES.S)
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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checkAndRequestBluetoothPermissions()
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bleManager.init()
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bleManager.checkAndRequestBluetoothPermissions()
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enableEdgeToEdge()
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setContent {
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ConnectCircleScreen(
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isConnected = isConnected,
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isConnected = bleManager.isConnected,
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onConnectClick = {
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Log.d("ESP32_BLE", "Button wurde gedrückt!")
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connectToEsp32("10:BD:A3:8F:01:0E")
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bleManager.connectToEsp32("10:BD:A3:8F:01:0E")
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}
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)
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}
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}
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@RequiresApi(Build.VERSION_CODES.S)
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private fun checkAndRequestBluetoothPermissions() {
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val permissions = arrayOf(
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Manifest.permission.BLUETOOTH_CONNECT,
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Manifest.permission.BLUETOOTH_SCAN,
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Manifest.permission.ACCESS_FINE_LOCATION
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)
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// Prüfen, ob die Berechtigungen bereits erteilt wurden
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val missingPermissions = permissions.filter {
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ActivityCompat.checkSelfPermission(this, it) != PackageManager.PERMISSION_GRANTED
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}
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if (missingPermissions.isNotEmpty()) {
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// Wenn Berechtigungen fehlen, frage den Nutzer danach
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ActivityCompat.requestPermissions(this, missingPermissions.toTypedArray(), 101)
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}
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}
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private fun connectToEsp32(deviceAddress: String) {
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Log.d("ESP32_BLE", "1. connectToEsp32 gestartet mit Adresse: $deviceAddress")
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val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
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val bluetoothAdapter = bluetoothManager.adapter
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if (bluetoothAdapter == null) {
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Log.d("ESP32_BLE", "Fehler: Bluetooth wird von diesem Gerät nicht unterstützt!")
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return
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}
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try {
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val device = bluetoothAdapter.getRemoteDevice(deviceAddress)
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Log.d("ESP32_BLE", "2. BluetoothDevice Objekt erfolgreich erstellt.")
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val gattCallback = object : BluetoothGattCallback() {
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@RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
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override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
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Log.d("ESP32_BLE", "3. onConnectionStateChange aufgerufen! Status: $status, NewState: $newState")
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if (status == BluetoothGatt.GATT_SUCCESS) {
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if (newState == BluetoothProfile.STATE_CONNECTED) {
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Log.d("ESP32_BLE", "4. Verbunden! Starte discoverServices()...")
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gatt.discoverServices()
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} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
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Log.d("ESP32_BLE", "5. Getrennt worden.")
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isConnected = false
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gatt.close()
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bluetoothGatt = null
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}
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} else {
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Log.d("ESP32_BLE", "Fehler in onConnectionStateChange! Status-Code: $status")
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isConnected = false
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}
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}
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override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
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Log.d("ESP32_BLE", "6. onServicesDiscovered aufgerufen mit Status: $status")
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if (status == BluetoothGatt.GATT_SUCCESS) {
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isConnected = true
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writeToEsp32("Hallo ESP32")
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Log.d("ESP32_BLE", "7. Services erfolgreich gefunden! Verbindung komplett erfolgreich.")
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}
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}
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}
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// Berechtigungsprüfung
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if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
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Log.d("ESP32_BLE", "8. Berechtigung vorhanden, rufe connectGatt auf...")
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bluetoothGatt = device.connectGatt(this, false, gattCallback)
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} else {
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Log.d("ESP32_BLE", "FEHLER: Keine BLUETOOTH_CONNECT Berechtigung erteilt!")
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}
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} catch (e: Exception) {
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Log.d("ESP32_BLE", "Exception gefangen: ${e.message}")
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}
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}
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private fun writeToEsp32(dataString: String) {
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// Prüfen, ob die Verbindung steht und bluetoothGatt nicht null ist
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val gatt = bluetoothGatt
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if (gatt == null) {
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Log.d("ESP32_BLE", "Fehler: Kein GATT-Objekt vorhanden (nicht verbunden).")
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return
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}
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// 1. Service holen
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val service = gatt.getService(SERVICE_UUID)
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if (service == null) {
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Log.d("ESP32_BLE", "Fehler: Service UUID nicht gefunden!")
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return
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}
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// 2. Characteristic holen
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val characteristic = service.getCharacteristic(CHARACTERISTIC_UUID)
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if (characteristic == null) {
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Log.d("ESP32_BLE", "Fehler: Characteristic UUID nicht gefunden!")
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return
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}
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// 3. Daten in Bytes umwandeln (z.B. einen String wie "LED_ON" in UTF-8 Bytes)
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val bytes = dataString.toByteArray(Charsets.UTF_8)
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characteristic.value = bytes
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// 4. Schreibtyp festlegen ( WRITE_TYPE_DEFAULT wartet auf Antwort vom ESP32, WRITE_TYPE_NO_RESPONSE ist schneller )
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characteristic.writeType = android.bluetooth.BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT
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// 5. Berechtigung prüfen und Schreibvorgang starten
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if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
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val success = gatt.writeCharacteristic(characteristic)
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Log.d("ESP32_BLE", "Schreibvorgang gestartet: $success")
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}
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}
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}
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