tls-psk: improve error handling on connection error

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/presenter/TransferPresenter.java

@@ -249,6 +249,16 @@ public class TransferPresenter implements KeyTransferCallback, LoaderCallbacks<L
         }, 750);
     }
 
+    @Override
+    public void onConnectionErrorConnect() {
+        view.showErrorConnectionFailed();
+    }
+
+    @Override
+    public void onConnectionErrorListen() {
+        view.showErrorListenFailed();
+    }
+
 
     private void connectionStartConnect(String qrCodeContent) {
         connectionClear();
@@ -336,6 +346,7 @@ public class TransferPresenter implements KeyTransferCallback, LoaderCallbacks<L
 
         void showErrorBadKey();
         void showErrorConnectionFailed();
+        void showErrorListenFailed();
         void showResultNotification(ImportKeyResult result);
 
         void setSecretKeyAdapter(Adapter adapter);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/transfer/view/TransferFragment.java

@@ -229,6 +229,11 @@ public class TransferFragment extends Fragment implements TransferMvpView {
         Notify.create(getActivity(), "Connection failed!", Style.ERROR).show();
     }
 
+    @Override
+    public void showErrorListenFailed() {
+        Notify.create(getActivity(), "Error setting up server!", Style.ERROR).show();
+    }
+
     @Override
     public void showResultNotification(ImportKeyResult result) {
         result.createNotify(getActivity()).show();