Improve Apple, Android and Windows (#40)

* Cleanup connection

* Reverse search list

* Bump version

* Fix Android serviceUuids in scanResults

* Fix typo

* Improve cleanup on apple

* Improve Apple reconnection and service discovery

* Persist long scan result name on Windows

Co-authored-by: navidecklabs <navidecklabs@users.noreply.github.com>

* Update changelog

---------

Co-authored-by: Rohit Sangwan <rohitsangwan647@gmail.com>
Co-authored-by: navidecklabs <navidecklabs@users.noreply.github.com>

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 0.9.9
+* Improve service discovery on Apple
+* Improve reconnection on Apple
+* Persist long scan result name on Windows
+* Fix Android serviceUuids in scanResults
+* Example app improvements
+
 ## 0.9.8
 * Improve manufacturer data discovery on Windows
 * Example app improvements

android/src/main/kotlin/com/navideck/universal_ble/UniversalBleHelper.kt

@@ -238,7 +238,7 @@ fun BluetoothDevice.removeBond() {
     try {
         javaClass.getMethod("removeBond").invoke(this)
     } catch (e: Exception) {
-        Log.e(TAG, "Removing bond has been failed. ${e.message}")
+        Log.e(TAG, "Removing bond failed. ${e.message}")
     }
 }
 

android/src/main/kotlin/com/navideck/universal_ble/UniversalBlePlugin.kt

@@ -665,6 +665,15 @@ class UniversalBlePlugin : UniversalBlePlatformChannel, BluetoothGattCallback(),
 
         override fun onScanResult(callbackType: Int, result: ScanResult) {
             // Log.v(TAG, "onScanResult: $result")
+            var serviceUuids: Array<String> = arrayOf<String>()
+            result.device.uuids?.forEach {
+                serviceUuids += it.uuid.toString()
+            }
+            result.scanRecord?.serviceUuids?.forEach {
+                if (!serviceUuids.contains(it.uuid.toString())) {
+                    serviceUuids += it.uuid.toString()
+                }
+            }
             mainThreadHandler?.post {
                 callbackChannel?.onScanResult(
                     UniversalBleScanResult(
@@ -673,13 +682,12 @@ class UniversalBlePlugin : UniversalBlePlatformChannel, BluetoothGattCallback(),
                         isPaired = result.device.bondState == BOND_BONDED,
                         manufacturerDataHead = result.manufacturerDataHead,
                         rssi = result.rssi.toLong(),
-                        services = result.device.uuids?.map { it.uuid?.toString() ?: "" }
+                        services = serviceUuids.toList()
-                            ?: emptyList()
                     )
                 ) {}
             }
         }
-
+    
         override fun onBatchScanResults(results: MutableList<ScanResult>?) {
             Log.v(TAG, "onBatchScanResults: $results")
         }

darwin/Classes/UniversalBlePlugin.swift

@@ -95,24 +95,51 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
 
   func cleanUpConnection(deviceId: String) {
     characteristicReadFutures.removeAll { future in
-      future.deviceId == deviceId
+      if future.deviceId == deviceId {
+        future.result(
+          Result.failure(FlutterError(code: "DeviceDisconnected", message: "Device Disconnected", details: nil))
+        )
+        return true
+      }
+      return false
     }
     discoverServicesFutures.removeAll { future in
-      future.deviceId == deviceId
+      if future.deviceId == deviceId {
+        future.result(
+          Result.failure(FlutterError(code: "DeviceDisconnected", message: "Device Disconnected", details: nil))
+        )
+        return true
+      }
+      return false
     }
     discoveredServicesProgressMap[deviceId] = nil
   }
 
   func discoverServices(deviceId: String, completion: @escaping (Result<[UniversalBleService], Error>) -> Void) {
     guard let peripheral = discoveredPeripherals[deviceId] else {
-      completion(Result.failure(
+      completion(
-        FlutterError(code: "IllegalArgument", message: "Unknown deviceId:\(self)", details: nil)))
+        Result.failure(FlutterError(code: "IllegalArgument", message: "Unknown deviceId:\(self)", details: nil))
+      )
       return
     }
+    
     if discoveredServicesProgressMap[deviceId] != nil {
-      completion(Result.failure(FlutterError(code: "AlreadyInProgress", message: "Services discovery already in progress for :\(deviceId)", details: nil)))
+      print("Services discovery already in progress for :\(deviceId), waiting for completion.")
+      discoverServicesFutures.append(DiscoverServicesFuture(deviceId: deviceId, result: completion))
       return
     }
+    
+    if let cachedServices = peripheral.services {
+      // If services already discovered no need to discover again
+      if !cachedServices.isEmpty {
+        // print("Services already cached for this peripheral")
+        discoverServicesFutures.append(DiscoverServicesFuture(deviceId: deviceId, result: completion))
+        self.peripheral(peripheral, didDiscoverServices: nil)
+        return
+      }
+    }
+    
+    
     peripheral.discoverServices(nil)
     discoverServicesFutures.append(DiscoverServicesFuture(deviceId: deviceId, result: completion))
   }
@@ -270,6 +297,8 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
 
   public func centralManager(_: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error _: Error?) {
     callbackChannel.onConnectionChanged(deviceId: peripheral.uuid.uuidString, state: BlueConnectionState.disconnected.rawValue) { _ in }
+    // Cleanup on disconnect
+    cleanUpConnection(deviceId: peripheral.uuid.uuidString)
   }
 
   public func peripheral(_ peripheral: CBPeripheral, didDiscoverServices _: Error?) {
@@ -280,6 +309,12 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
     }
     discoveredServicesProgressMap[deviceId] = services.map { UniversalBleService(uuid: $0.uuid.uuidString, characteristics: nil) }
     for service in services {
+      if let cachedChar = service.characteristics {
+        if !cachedChar.isEmpty {
+          self.peripheral(peripheral, didDiscoverCharacteristicsFor: service, error: nil)
+          continue
+        }
+      }
       peripheral.discoverCharacteristics(nil, for: service)
     }
   }
@@ -303,7 +338,7 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
   }
 
   public func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
-    print("peripheral:didWriteValueForCharacteristic \(characteristic.uuid.uuidStr) error: \(String(describing: error))")
+    // print("peripheral:didWriteValueForCharacteristic \(characteristic.uuid.uuidStr) error: \(String(describing: error))")
     // Update futures for writeValue
     characteristicWriteFutures.removeAll { future in
       if future.deviceId == peripheral.uuid.uuidString && future.characteristicId == characteristic.uuid.uuidStr && future.serviceId == characteristic.service?.uuid.uuidStr {

example/lib/home/home.dart

@@ -225,7 +225,8 @@ class _MyAppState extends State<MyApp> {
                         itemCount: _scanResults.length,
                         separatorBuilder: (context, index) => const Divider(),
                         itemBuilder: (context, index) {
-                          BleScanResult scanResult = _scanResults[index];
+                          BleScanResult scanResult =
+                              _scanResults[_scanResults.length - index - 1];
                           return ScannedItemWidget(
                             scanResult: scanResult,
                             onTap: () {

example/macos/Podfile.lock

@@ -26,4 +26,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: 236401fc2c932af29a9fcf0e97baeeb2d750d367
 
-COCOAPODS: 1.14.3
+COCOAPODS: 1.15.2

example/macos/Runner.xcodeproj/project.pbxproj

@@ -259,7 +259,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0920;
-				LastUpgradeCheck = 1430;
+				LastUpgradeCheck = 1510;
 				ORGANIZATIONNAME = "";
 				TargetAttributes = {
 					331C80D4294CF70F00263BE5 = {

example/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1430"
+   LastUpgradeVersion = "1510"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

pubspec.yaml

@@ -1,6 +1,6 @@
 name: universal_ble
 description: A cross-platform (Android/iOS/macOS/Windows/Linux/Web) Bluetooth Low Energy (BLE) plugin for Flutter
-version: 0.9.8
+version: 0.9.9
 homepage: https://navideck.com
 repository: https://github.com/Navideck/universal_ble
 issue_tracker: https://github.com/Navideck/universal_ble/issues

windows/src/universal_ble_plugin.cpp

@@ -554,26 +554,37 @@ namespace universal_ble
     auto it = scanResults.find(scanResult.device_id());
     if (it != scanResults.end())
     {
-      UniversalBleScanResult &existingScanResult = it->second;
+      UniversalBleScanResult &currentScanResult = it->second;
       bool shouldUpdate = false;
-      if ((scanResult.name() == nullptr || scanResult.name()->empty()) && (existingScanResult.name() != nullptr && !existingScanResult.name()->empty()))
+
+      // Check if current scanResult name is longer than the received scanResult name
+      if (scanResult.name() != nullptr && !scanResult.name()->empty() && currentScanResult.name() != nullptr && !currentScanResult.name()->empty())
       {
-        scanResult.set_name(*existingScanResult.name());
+        if (currentScanResult.name()->size() > scanResult.name()->size())
+        {
+          scanResult.set_name(*currentScanResult.name()); 
+        }
+      }
+
+      if ((scanResult.name() == nullptr || scanResult.name()->empty()) && (currentScanResult.name() != nullptr && !currentScanResult.name()->empty()))
+      {
+        scanResult.set_name(*currentScanResult.name());
         shouldUpdate = true;
       }
-      if (scanResult.is_paired() == nullptr && existingScanResult.is_paired() != nullptr)
+
+      if (scanResult.is_paired() == nullptr && currentScanResult.is_paired() != nullptr)
       {
-        scanResult.set_is_paired(existingScanResult.is_paired());
+        scanResult.set_is_paired(currentScanResult.is_paired());
         shouldUpdate = true;
       }
-      if (scanResult.manufacturer_data_head() == nullptr && existingScanResult.manufacturer_data_head() != nullptr)
+      if (scanResult.manufacturer_data_head() == nullptr && currentScanResult.manufacturer_data_head() != nullptr)
       {
-        scanResult.set_manufacturer_data_head(existingScanResult.manufacturer_data_head());
+        scanResult.set_manufacturer_data_head(currentScanResult.manufacturer_data_head());
         shouldUpdate = true;
       }
-      if (scanResult.services() == nullptr && existingScanResult.services() != nullptr)
+      if (scanResult.services() == nullptr && currentScanResult.services() != nullptr)
       {
-        scanResult.set_services(existingScanResult.services());
+        scanResult.set_services(currentScanResult.services());
         shouldUpdate = true;
       }
 
@@ -581,8 +592,8 @@ namespace universal_ble
       if (!shouldUpdate)
         return;
 
-      // update the existing scan result
+      // update the current scan result
-      existingScanResult = scanResult;
+      currentScanResult = scanResult;
     }
     else
     {