added AlwaysTrueTopicFilter

+/**
+ * Copyright © 2016-2020 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.transport.mqtt.util;
+
+import lombok.Data;
+
+@Data
+public class AlwaysTrueTopicFilter implements MqttTopicFilter {
+
+    @Override
+    public boolean filter(String topic) {
+        return true;
+    }
+}

@@ -36,7 +36,7 @@ public class MqttTopicFilterFactory {
             if (filter.contains("+") || filter.contains("#")) {
                 String regex;
                 if (filter.equals("#")) {
-                    regex = filter.replace("#", "\\S+");
+                    return new AlwaysTrueTopicFilter();
                 } else {
                     regex = filter
                             .replace("\\", "\\\\")

@@ -31,9 +31,8 @@ public class MqttTopicFilterFactoryTest {
     private static String TEST_STR_2 = "Sensor/Temperature";
     private static String TEST_STR_3 = "Sensor/Temperature2/House/48";
     private static String TEST_STR_4 = "/Sensor/Temperature2/House/48";
-    private static String TEST_STR_5 = String.format("%s%n%s", "/Sensor/Temperature", "/House/48");
-    private static String TEST_STR_6 = "";
-    private static String TEST_STR_7 = " ";
+    private static String TEST_STR_5 = "Sensor/ Temperature";
+    private static String TEST_STR_6 = "/";
 
     @Test
     public void metadataCanBeUpdated() throws ScriptException {
@@ -60,9 +59,11 @@ public class MqttTopicFilterFactoryTest {
         assertTrue(filter.filter(TEST_STR_2));
         assertTrue(filter.filter(TEST_STR_3));
         assertTrue(filter.filter(TEST_STR_4));
-        assertFalse(filter.filter(TEST_STR_5));
-        assertFalse(filter.filter(TEST_STR_6));
-        assertFalse(filter.filter(TEST_STR_7));
+        assertTrue(filter.filter(TEST_STR_5));
+        assertTrue(filter.filter(TEST_STR_6));
+
+        filter = MqttTopicFilterFactory.toFilter("Sensor/Temperature#");
+        assertFalse(filter.filter(TEST_STR_2));
     }
 
 }