Can hang up conversation

app/src/main/java/org/communiquons/signalexchangerclient/SignalExchangerClient.java

@@ -71,6 +71,14 @@ public class SignalExchangerClient extends WebSocketListener {
         mWebSocket = mClient.newWebSocket(request, this);
     }
 
+    /**
+     * Close this socket
+     */
+    public void close(){
+        if(mWebSocket != null)
+            mWebSocket.close(4999, null);
+    }
+
     /**
      * Get current client configuration
      *