time sync with esp32

app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt

@@ -18,9 +18,19 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.core.app.ActivityCompat
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import java.time.LocalDate
+import java.time.LocalTime
+import java.time.format.DateTimeFormatter
 import java.util.UUID
+import kotlin.time.Duration.Companion.milliseconds
 
 class BleManager(private val context: Context) {
+    val currentTime = LocalTime.now()
+    val currentDate = LocalDate.now()
     val deviceUUIDs = DeviceUUIDs
     private var bluetoothGatt: BluetoothGatt? = null
 
@@ -89,7 +99,7 @@ class BleManager(private val context: Context) {
                     Log.d("ESP32_BLE", "6. onServicesDiscovered aufgerufen mit Status: $status")
                     if (status == BluetoothGatt.GATT_SUCCESS) {
                         isConnected = true
-                        writeToEsp32("Hallo ESP32", deviceUUIDs.TIME_CHARACTERISTIC_UUID, deviceUUIDs.TIME_CHARACTERISTIC_UUID)
+                        writeToEsp32("Hallo ESP32", deviceUUIDs.SERVICE_UUID, deviceUUIDs.CHAR_DATE_UUID)
                         Log.d("ESP32_BLE", "7. Services erfolgreich gefunden! Verbindung komplett erfolgreich.")
                     }
                 }
@@ -120,7 +130,7 @@ class BleManager(private val context: Context) {
         }
     }
 
-    fun writeToEsp32(dataString: String, SERVICE_UUID: UUID?, TIME_CHARACTERISTIC_UUID: UUID?) {
+    fun writeToEsp32(dataString: String, SERVICE_UUID: UUID?, CHARACTERISTIC_UUID: UUID?) {
         // Prüfen, ob die Verbindung steht und bluetoothGatt nicht null ist
         val gatt = bluetoothGatt
         if (gatt == null) {
@@ -136,7 +146,7 @@ class BleManager(private val context: Context) {
         }
 
         // 2. Characteristic holen
-        val characteristic = service.getCharacteristic(TIME_CHARACTERISTIC_UUID)
+        val characteristic = service.getCharacteristic(CHARACTERISTIC_UUID)
         if (characteristic == null) {
             Log.d("ESP32_BLE", "Fehler: Characteristic UUID nicht gefunden!")
             return
@@ -155,4 +165,21 @@ class BleManager(private val context: Context) {
             Log.d("ESP32_BLE", "Schreibvorgang gestartet: $success")
         }
     }
+    fun syncTime() {
+        val formatterTime = DateTimeFormatter.ofPattern("HH mm ss")
+        val formattedTime = currentTime.format(formatterTime)
+
+        val formatter = DateTimeFormatter.ofPattern("dd MM yyyy")
+        val formattedDate = currentDate.format(formatter)
+
+        Log.d("Time/Date","$formattedDate $formattedTime")
+
+        CoroutineScope(Dispatchers.IO).launch {
+            writeToEsp32(formattedTime, deviceUUIDs.SERVICE_UUID, deviceUUIDs.CHAR_TIME_UUID)
+
+            delay(150.milliseconds) // Kurze Pause für den BLE-Stack (z. B. 150 ms)
+
+            writeToEsp32("$formattedDate", deviceUUIDs.SERVICE_UUID, deviceUUIDs.CHAR_DATE_UUID)
+        }
+    }
 }

app/src/main/java/com/example/smart_watch_android/BLE/DeviceUUIDs.kt

@@ -4,5 +4,7 @@ import java.util.UUID
 
 object DeviceUUIDs {
     val SERVICE_UUID: UUID? = UUID.fromString("791cadd7-de87-49f9-8986-94b7ae11940b")
-    val TIME_CHARACTERISTIC_UUID: UUID? = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e02")
+    val CHAR_MESSAGE_UUID: UUID? = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e01")
+    val CHAR_TIME_UUID:UUID? = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e02")
+    val CHAR_DATE_UUID:UUID? = UUID.fromString("3e4eac5b-eaa2-4e0c-a705-dcac4f606e03")
 }

app/src/main/java/com/example/smart_watch_android/Screens/ControlPanelScreen.kt

@@ -52,7 +52,7 @@ fun ControlPanelScreen(
             onClick = {
                 if (textInput.isNotEmpty()) {
                     bleManager.writeToEsp32(
-                        textInput, DeviceUUIDs.SERVICE_UUID, DeviceUUIDs.TIME_CHARACTERISTIC_UUID
+                        textInput, DeviceUUIDs.SERVICE_UUID, DeviceUUIDs.CHAR_DATE_UUID
                     )
                     textInput = "" // Feld danach leeren
                 }
@@ -64,6 +64,17 @@ fun ControlPanelScreen(
 
         Spacer(modifier = Modifier.height(32.dp))
 
+        Button(
+            onClick = {
+                bleManager.syncTime()
+            },
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text("sync Time")
+        }
+
+        Spacer(modifier = Modifier.height(64.dp))
+
         // Disconnect Button (z.B. in Rot, um ihn abzusetzen)
         Button(
             onClick = onDisconnectClicked,