fix: add createRecoveryKey method

android/src/main/java/io/ably/flutter/plugin/AblyMethodCallHandler.java

@@ -112,6 +112,9 @@ public AblyMethodCallHandler(final MethodChannel methodChannel,
     _map.put(PlatformConstants.PlatformMethod.restAuthGetClientId,
             (methodCall, result) -> authMethodHandler.clientId(methodCall, result, AuthMethodHandler.Type.Rest));
 
+    // Connection specific handlers
+    _map.put(PlatformConstants.PlatformMethod.connectionRecoveryKey, this::connectionRecoveryKey);
+
     // Push Notifications
     _map.put(PlatformConstants.PlatformMethod.pushActivate, this::pushActivate);
     _map.put(PlatformConstants.PlatformMethod.pushDeactivate, this::pushDeactivate);
@@ -551,14 +554,17 @@ private void realtimeTime(@NonNull MethodCall methodCall, @NonNull MethodChannel
         time(result, instanceStore.getRealtime(ablyMessage.handle));
     }
 
-
-
-
-  private void restTime(@NonNull MethodCall methodCall, @NonNull MethodChannel.Result result) {
+    private void restTime(@NonNull MethodCall methodCall, @NonNull MethodChannel.Result result) {
         final AblyFlutterMessage ablyMessage = (AblyFlutterMessage) methodCall.arguments;
         time(result, instanceStore.getRest(ablyMessage.handle));
     }
 
+    private void connectionRecoveryKey(@NonNull MethodCall methodCall, @NonNull MethodChannel.Result result) {
+        final AblyFlutterMessage<?> ablyMessage = (AblyFlutterMessage<?>) methodCall.arguments;
+        AblyRealtime realtime = instanceStore.getRealtime(ablyMessage.handle);
+        result.success(realtime.connection.recoveryKey);
+    }
+
     private void time(@NonNull MethodChannel.Result result, AblyBase client) {
         Callback<Long> callback = new Callback<Long>() {
             @Override

android/src/main/java/io/ably/flutter/plugin/generated/PlatformConstants.java

@@ -77,6 +77,9 @@ static final public class PlatformMethod {
         public static final String realtimeAuthCreateTokenRequest = "realtimeAuthCreateTokenRequest";
         public static final String realtimeAuthRequestToken = "realtimeAuthRequestToken";
         public static final String realtimeAuthGetClientId = "realtimeAuthGetClientId";
+
+        public static final String connectionRecoveryKey = "connectionRecoveryKey";
+
         public static final String pushActivate = "pushActivate";
         public static final String pushDeactivate = "pushDeactivate";
         public static final String pushReset = "pushReset";

ios/Classes/AblyFlutter.m

@@ -599,6 +599,14 @@ -(void)reset;
     }];
 };
 
+static const FlutterHandler _connectionRecoveryKey = ^void(AblyFlutter *const ably, FlutterMethodCall *const call, const FlutterResult result) {
+    AblyFlutterMessage *const ablyMessage = call.arguments;
+    AblyInstanceStore *const instanceStore = [ably instanceStore];
+    ARTRealtime *const realtime = [instanceStore realtimeFrom:ablyMessage.handle];
+    NSString *const connectionRecoveryKey = [realtime.connection recoveryKey];
+    result(connectionRecoveryKey);
+};
+
 static const FlutterHandler _getNextPage = ^void(AblyFlutter *const ably, FlutterMethodCall *const call, const FlutterResult result) {
     AblyFlutterMessage *const ablyMessage = call.arguments;
 
@@ -741,6 +749,8 @@ -(instancetype)initWithChannel:(FlutterMethodChannel *const)channel
         AblyPlatformMethod_releaseRealtimeChannel: _releaseRealtimeChannel,
         AblyPlatformMethod_realtimeTime:_realtimeTime,
         AblyPlatformMethod_restTime:_restTime,
+        // Connection fields
+        AblyPlatformMethod_connectionRecoveryKey:_connectionRecoveryKey,
         // Push Notifications
         AblyPlatformMethod_pushActivate: PushHandlers.activate,
         AblyPlatformMethod_pushRequestPermission: PushHandlers.requestPermission,

ios/Classes/codec/AblyPlatformConstants.h

@@ -75,6 +75,9 @@ extern NSString *const AblyPlatformMethod_realtimeAuthAuthorize;
 extern NSString *const AblyPlatformMethod_realtimeAuthCreateTokenRequest;
 extern NSString *const AblyPlatformMethod_realtimeAuthRequestToken;
 extern NSString *const AblyPlatformMethod_realtimeAuthGetClientId;
+
+extern NSString *const AblyPlatformMethod_connectionRecoveryKey;
+
 extern NSString *const AblyPlatformMethod_pushActivate;
 extern NSString *const AblyPlatformMethod_pushDeactivate;
 extern NSString *const AblyPlatformMethod_pushReset;

ios/Classes/codec/AblyPlatformConstants.m

@@ -44,6 +44,9 @@
 NSString *const AblyPlatformMethod_realtimeAuthCreateTokenRequest= @"realtimeAuthCreateTokenRequest";
 NSString *const AblyPlatformMethod_realtimeAuthRequestToken= @"realtimeAuthRequestToken";
 NSString *const AblyPlatformMethod_realtimeAuthGetClientId= @"realtimeAuthGetClientId";
+
+NSString *const AblyPlatformMethod_connectionRecoveryKey = @"connectionRecoveryKey";
+
 NSString *const AblyPlatformMethod_pushActivate= @"pushActivate";
 NSString *const AblyPlatformMethod_pushDeactivate= @"pushDeactivate";
 NSString *const AblyPlatformMethod_pushReset= @"pushReset";

lib/src/generated/platform_constants.dart

@@ -76,6 +76,9 @@ class PlatformMethod {
       'realtimeAuthCreateTokenRequest';
   static const String realtimeAuthRequestToken = 'realtimeAuthRequestToken';
   static const String realtimeAuthGetClientId = 'realtimeAuthGetClientId';
+
+  static const String connectionRecoveryKey = 'connectionRecoveryKey';
+
   static const String pushActivate = 'pushActivate';
   static const String pushDeactivate = 'pushDeactivate';
   static const String pushReset = 'pushReset';

lib/src/platform/src/realtime/connection.dart

@@ -61,8 +61,17 @@ class Connection extends PlatformObject {
   ///
   /// See [connection state recover options](https://ably.com/docs/realtime/connection#connection-state-recover-options)
   /// for more information.
+  @Deprecated('Use createRecoveryKey instead')
   String? recoveryKey;
 
+  /// The createRecoveryKey returns key string can be used by another client to
+  /// recover this connection's state in the recover client options property.
+  ///
+  /// See [connection state recover options](https://ably.com/docs/realtime/connection#connection-state-recover-options)
+  /// for more information.
+  Future<String?> createRecoveryKey() =>
+      invoke<String?>(PlatformMethod.connectionRecoveryKey);
+
   /// The serial number of the last message to be received on this connection,
   /// used automatically by the library when recovering or resuming a
   /// connection.