Fix bug with connecting to bonded printer

composeApp/src/commonMain/kotlin/App.kt

@@ -54,6 +54,7 @@ fun App() {
         val scope = rememberCoroutineScope()
         var message  by remember { mutableStateOf("") }
         var showDialog  by remember { mutableStateOf(false) }
+        var scanCount by remember { mutableStateOf(0) }
 
         LaunchedEffect(Unit){
             if (!showContent) showContent = true
@@ -70,6 +71,23 @@ fun App() {
             }
             showDialog = message.isNotEmpty()
         }
+        LaunchedEffect(connectionState){
+            if (connectionState.isBluetoothReady && !connectionState.discoveredPrinter && !connectionState.isScanning && scanCount == 0){
+                scanCount++
+                scope.launch {
+                    bluetoothConnection.scanForPrinters()
+                }
+                //println("Scanning")
+            }
+            if (connectionState.discoveredPrinter && !connectionState.isConnected){
+                bluetoothConnection.connect()
+                println("Connecting")
+            }
+            if (connectionState.isPrinting){
+                //printingStarted = true
+                println("Printing")
+            }
+        }
 
         Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally) {
             TopAppBar(modifier = Modifier.fillMaxWidth(), title = { Text("Discovered Bluetooth devices") })

library/build.gradle.kts

@@ -53,7 +53,7 @@ android {
 @Suppress("UnstableApiUsage")
 mavenPublishing {
     publishToMavenCentral(SonatypeHost.S01, true)
-    val versionTxt = "0.0.2"
+    val versionTxt = "0.0.3"
     val isDev = findProperty("env")?.equals("dev") ?: false
     val version = if (isDev) "0.0.1-SNAPSHOT" else versionTxt
 

library/src/androidMain/kotlin/com/dilivva/blueline/connection/bluetooth/AndroidBluetoothConnection.kt

@@ -55,6 +55,7 @@ internal object AndroidBluetoothConnection: BlueLine {
     //Service UUID is 16bit e.g FF00, to scan we'll have to use 0000xxxx-0000-1000-8000-00805F9B34FB
     private val printerUUID = ParcelUuid.fromString("000018F0-0000-1000-8000-00805F9B34FB")
     private val characterUuid = UUID.fromString("00002AF1-0000-1000-8000-00805F9B34FB")
+    private val bondedUUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb")
 
     private var bluetoothDevice: BluetoothDevice? = null
     private val bluetoothLeScanner = bluetoothAdapter?.bluetoothLeScanner
@@ -170,7 +171,7 @@ internal object AndroidBluetoothConnection: BlueLine {
             return
         }
         val pairedDevices: Set<BluetoothDevice>? = bluetoothAdapter?.bondedDevices
-        val pairedPrinter = pairedDevices?.find { it.uuids.contains(printerUUID) }
+        val pairedPrinter = pairedDevices?.find { it.isPrinter() }
         if (pairedPrinter != null){
             bluetoothDevice = pairedPrinter
             stateFlow.update { state -> state.copy(deviceName = pairedPrinter.name.orEmpty(), discoveredPrinter = true) }
@@ -213,16 +214,24 @@ internal object AndroidBluetoothConnection: BlueLine {
             stateFlow.update { it.copy(isScanning = false) }
         }
         stateFlow.update { it.copy(bluetoothConnectionError = null, isScanning = true) }
+
         bluetoothLeScanner?.startScan(
             listOf(ScanFilter.Builder().setServiceUuid(printerUUID).build()),
             ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_BALANCED).build(),
             scanCallback
         )
-        delay(10.seconds)
+
+        delay(5.seconds)
         if (!stateFlow.value.discoveredPrinter){
             stateFlow.update { it.copy(bluetoothConnectionError = ConnectionError.BLUETOOTH_PRINTER_DEVICE_NOT_FOUND, isScanning = false) }
         }
+
         bluetoothLeScanner?.stopScan(scanCallback)
+
+    }
+
+    private fun BluetoothDevice.isPrinter(): Boolean{
+        return uuids.any { it.uuid == bondedUUID }
     }
 
 }

library/src/iosMain/kotlin/com/dilivva/blueline/connection/bluetooth/IosBluetoothConnection.kt

@@ -109,7 +109,7 @@ internal object IosBluetoothConnection: BlueLine {
         }
         stateFlow.update { it.copy(bluetoothConnectionError = null, isScanning = true) }
         centralManager.scanForPeripheralsWithServices(serviceUUIDs = listOf(delegate.UUID), options = null)
-        delay(10.seconds)
+        delay(5.seconds)
         if (!stateFlow.value.discoveredPrinter){
             stateFlow.update { it.copy(bluetoothConnectionError = ConnectionError.BLUETOOTH_PRINTER_DEVICE_NOT_FOUND, isScanning = false) }
         }