Bumped version to release

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.kde.kdeconnect_tp"
-    android:versionCode="1830"
-    android:versionName="1.8.3">
+    android:versionCode="1840"
+    android:versionName="1.8.4">
 
     <supports-screens
         android:anyDensity="true"

src/org/kde/kdeconnect/Backends/LanBackend/LanLinkProvider.java

@@ -253,7 +253,9 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
                 //Handshake is blocking, so do it on another thread and free this thread to keep receiving new connection
                 new Thread(() -> {
                     try {
-                        sslsocket.startHandshake();
+                        synchronized (this) {
+                            sslsocket.startHandshake();
+                        }
                     } catch (Exception e) {
                         Log.e("KDE/LanLinkProvider", "Handshake failed with " + identityPacket.getString("deviceName"));
                         e.printStackTrace();
@@ -286,7 +288,7 @@ public class LanLinkProvider extends BaseLinkProvider implements LanLink.LinkDis
      * @param connectionOrigin which side started this connection
      * @throws IOException if an exception is thrown by {@link LanLink#reset(Socket, LanLink.ConnectionStarted)}
      */
-    private synchronized void addLink(final NetworkPacket identityPacket, Socket socket, LanLink.ConnectionStarted connectionOrigin) throws IOException {
+    private void addLink(final NetworkPacket identityPacket, Socket socket, LanLink.ConnectionStarted connectionOrigin) throws IOException {
 
         String deviceId = identityPacket.getString("deviceId");
         LanLink currentLink = visibleComputers.get(deviceId);

src/org/kde/kdeconnect/Helpers/SecurityHelpers/SslHelper.java

@@ -42,6 +42,7 @@ import org.spongycastle.operator.jcajce.JcaContentSignerBuilder;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.net.Socket;
+import java.net.SocketException;
 import java.security.KeyStore;
 import java.security.MessageDigest;
 import java.security.PrivateKey;
@@ -201,7 +202,7 @@ public class SslHelper {
 
     }
 
-    public static void configureSslSocket(SSLSocket socket, boolean isDeviceTrusted, boolean isClient) {
+    public static void configureSslSocket(SSLSocket socket, boolean isDeviceTrusted, boolean isClient) throws SocketException {
 
         socket.setEnabledProtocols(new String[]{"TLSv1"}); //Newer TLS versions are only supported on API 16+
 
@@ -223,6 +224,8 @@ public class SslHelper {
         }
         socket.setEnabledCipherSuites(supportedCiphers.toArray(new String[supportedCiphers.size()]));
 
+        socket.setSoTimeout(1000);
+
         if (isClient) {
             socket.setUseClientMode(true);
         } else {