fixed copy string values from msg to md in TbCopyKeysNode

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbCopyKeysNode.java

@@ -95,7 +95,9 @@ public class TbCopyKeysNode extends TbAbstractTransformNodeWithTbMsgSource {
                         String keyData = entry.getKey();
                         if (matches(keyData)) {
                             msgChanged = true;
-                            metaDataCopy.putValue(keyData, JacksonUtil.toString(entry.getValue()));
+                            String value = entry.getValue().isTextual() ?
+                                    entry.getValue().asText() : JacksonUtil.toString(entry.getValue());
+                            metaDataCopy.putValue(keyData, value);
                         }
                     }
                     break;

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbCopyKeysNodeTest.java

@@ -101,10 +101,12 @@ public class TbCopyKeysNodeTest {
     @Test
     void givenMsgFromMsg_whenOnMsg_thenVerifyOutput() throws Exception {
         config.setCopyFrom(TbMsgSource.DATA);
+        config.setKeys(Set.of(".*Key$"));
         nodeConfiguration = new TbNodeConfiguration(JacksonUtil.valueToTree(config));
         node.init(ctx, nodeConfiguration);
 
-        String data = "{\"DigitData\":22.5,\"TempDataValue\":10.5}";
+        String data = "{\"nullKey\":null,\"stringKey\":\"value1\",\"booleanKey\":true,\"doubleKey\":42.0,\"longKey\":73," +
+                "\"jsonKey\":{\"someNumber\":42,\"someArray\":[1,2,3],\"someNestedObject\":{\"key\":\"value\"}}}";
         node.onMsg(ctx, getTbMsg(deviceId, data));
 
         ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
@@ -115,8 +117,13 @@ public class TbCopyKeysNodeTest {
         assertThat(newMsg).isNotNull();
 
         Map<String, String> metaDataMap = newMsg.getMetaData().getData();
-        assertThat(metaDataMap.containsKey("DigitData")).isEqualTo(true);
+        assertThat(metaDataMap.get("nullKey")).isEqualTo("null");
-        assertThat(metaDataMap.containsKey("TempDataValue")).isEqualTo(true);
+        assertThat(metaDataMap.get("stringKey")).isEqualTo("value1");
+        assertThat(metaDataMap.get("booleanKey")).isEqualTo("true");
+        assertThat(metaDataMap.get("doubleKey")).isEqualTo("42.0");
+        assertThat(metaDataMap.get("longKey")).isEqualTo("73");
+        assertThat(metaDataMap.get("jsonKey"))
+                .isEqualTo("{\"someNumber\":42,\"someArray\":[1,2,3],\"someNestedObject\":{\"key\":\"value\"}}");
     }
 
     @Test