Store last selected configuration for UART profile

profile_uart/src/main/java/no/nordicsemi/android/uart/data/ConfigurationDataSource.kt

@@ -0,0 +1,36 @@
+package no.nordicsemi.android.uart.data
+
+import android.content.Context
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import androidx.datastore.preferences.preferencesDataStore
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.flow.map
+import javax.inject.Inject
+import javax.inject.Singleton
+
+private const val FILE = "UART_CONFIGURATION"
+private const val LAST_CONFIGURATION_KEY = "LAST_CONFIGURATION"
+
+@Singleton
+internal class ConfigurationDataSource @Inject constructor(
+    @ApplicationContext
+    private val context: Context
+) {
+
+    private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = FILE)
+
+    private val LAST_CONFIGURATION = stringPreferencesKey(LAST_CONFIGURATION_KEY)
+
+    val lastConfigurationName = context.dataStore.data.map {
+        it[LAST_CONFIGURATION]
+    }
+
+    suspend fun saveConfigurationName(name: String) {
+        context.dataStore.edit {
+            it[LAST_CONFIGURATION] = name
+        }
+    }
+}

profile_uart/src/main/java/no/nordicsemi/android/uart/repository/UARTRepository.kt

@@ -17,10 +17,11 @@ import javax.inject.Inject
 import javax.inject.Singleton
 
 @Singleton
-class UARTRepository @Inject constructor(
+class UARTRepository @Inject internal constructor(
     @ApplicationContext
     private val context: Context,
     private val serviceManager: ServiceManager,
+    private val configurationDataSource: ConfigurationDataSource
 ) {
     private var manager: UARTManager? = null
 
@@ -30,6 +31,8 @@ class UARTRepository @Inject constructor(
     val isRunning = data.map { it.isRunning() }
     val hasBeenDisconnected = data.map { it.hasBeenDisconnected() }
 
+    val lastConfigurationName = configurationDataSource.lastConfigurationName
+
     fun launch(device: BluetoothDevice) {
         serviceManager.startService(UARTService::class.java, device)
     }
@@ -57,6 +60,10 @@ class UARTRepository @Inject constructor(
         manager?.clearItems()
     }
 
+    suspend fun saveConfigurationName(name: String) {
+        configurationDataSource.saveConfigurationName(name)
+    }
+
     private suspend fun UARTManager.start(device: BluetoothDevice) {
         try {
             connect(device)

profile_uart/src/main/java/no/nordicsemi/android/uart/viewmodel/UARTViewModel.kt

@@ -42,6 +42,12 @@ internal class UARTViewModel @Inject constructor(
         dataSource.getConfigurations().onEach {
             _state.value = _state.value.copy(configurations = it)
         }.launchIn(viewModelScope)
+
+        repository.lastConfigurationName.onEach {
+            it?.let {
+                _state.value = _state.value.copy(selectedConfigurationName = it)
+            }
+        }.launchIn(viewModelScope)
     }
 
     private fun requestBluetoothDevice() {
@@ -88,6 +94,7 @@ internal class UARTViewModel @Inject constructor(
             dataSource.saveConfiguration(UARTConfiguration(null, event.name))
             _state.value = _state.value.copy(selectedConfigurationName = event.name)
         }
+        saveLastConfigurationName(event.name)
     }
 
     private fun onEditMacro(event: OnEditMacro) {
@@ -99,7 +106,13 @@ internal class UARTViewModel @Inject constructor(
     }
 
     private fun onConfigurationSelected(event: OnConfigurationSelected) {
-        _state.value = _state.value.copy(selectedConfigurationName = event.configuration.name)
+        saveLastConfigurationName(event.configuration.name)
+    }
+
+    private fun saveLastConfigurationName(name: String) {
+        viewModelScope.launch {
+            repository.saveConfigurationName(name)
+        }
     }
 
     private fun addNewMacro(macro: UARTMacro) {