diff --git a/application/src/main/java/org/thingsboard/server/controller/RpcController.java b/application/src/main/java/org/thingsboard/server/controller/RpcController.java
index f98bf364df..269755bd3e 100644
--- a/application/src/main/java/org/thingsboard/server/controller/RpcController.java
+++ b/application/src/main/java/org/thingsboard/server/controller/RpcController.java
@@ -97,13 +97,9 @@ public class RpcController extends BaseController {
     private DeferredResult<ResponseEntity> handleDeviceRPCRequest(boolean oneWay, DeviceId deviceId, String requestBody) throws ThingsboardException {
         try {
             JsonNode rpcRequestBody = jsonMapper.readTree(requestBody);
-            String requestData;
-            if (rpcRequestBody.get("params").isTextual()) {
-                requestData = rpcRequestBody.get("params").asText();
-            } else {
-                requestData = jsonMapper.writeValueAsString(rpcRequestBody.get("params"));
-            }
-            RpcRequest cmd = new RpcRequest(rpcRequestBody.get("method").asText(), requestData);
+            RpcRequest cmd = new RpcRequest(rpcRequestBody.get("method").asText(),
+                    jsonMapper.writeValueAsString(rpcRequestBody.get("params")));
+
             if (rpcRequestBody.has("timeout")) {
                 cmd.setTimeout(rpcRequestBody.get("timeout").asLong());
             }
diff --git a/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/adaptors/ProtoMqttAdaptor.java b/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/adaptors/ProtoMqttAdaptor.java
index a004fbd500..c948e755c2 100644
--- a/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/adaptors/ProtoMqttAdaptor.java
+++ b/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/adaptors/ProtoMqttAdaptor.java
@@ -146,7 +146,7 @@ public class ProtoMqttAdaptor implements MqttTransportAdaptor {
 
     @Override
     public Optional<MqttMessage> convertToPublish(MqttDeviceAwareSessionContext ctx, TransportProtos.ToDeviceRpcRequestMsg rpcRequest) {
-        return Optional.of(createMqttPublishMsg(ctx, MqttTopics.DEVICE_RPC_REQUESTS_TOPIC + rpcRequest.getRequestId(), rpcRequest.toByteArray()));
+        return Optional.of(createMqttPublishMsg(ctx, MqttTopics.DEVICE_RPC_REQUESTS_TOPIC + rpcRequest.getRequestId(), ProtoConverter.convertToRpcRequest(rpcRequest)));
     }
 
     @Override
diff --git a/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/JsonConverter.java b/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/JsonConverter.java
index af27f4de1e..772faedc7d 100644
--- a/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/JsonConverter.java
+++ b/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/JsonConverter.java
@@ -22,7 +22,6 @@ import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import com.google.gson.JsonPrimitive;
 import com.google.gson.JsonSyntaxException;
-import com.google.gson.stream.MalformedJsonException;
 import org.apache.commons.lang3.math.NumberUtils;
 import org.springframework.util.StringUtils;
 import org.thingsboard.server.common.data.DataConstants;
@@ -158,15 +157,7 @@ public class JsonConverter {
             result.addProperty("id", msg.getRequestId());
         }
         result.addProperty("method", msg.getMethodName());
-        try {
-            result.add("params", JSON_PARSER.parse(msg.getParams()));
-        } catch (JsonSyntaxException ex) {
-            if (ex.getCause() instanceof MalformedJsonException) {
-                result.addProperty("params", msg.getParams());
-            } else {
-                throw ex;
-            }
-        }
+        result.add("params", JSON_PARSER.parse(msg.getParams()));
         return result;
     }
 
diff --git a/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/ProtoConverter.java b/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/ProtoConverter.java
index fc82f78633..ed440ebcfe 100644
--- a/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/ProtoConverter.java
+++ b/common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/adaptor/ProtoConverter.java
@@ -15,7 +15,9 @@
  */
 package org.thingsboard.server.common.transport.adaptor;
 
+import com.google.gson.JsonElement;
 import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
 import com.google.protobuf.InvalidProtocolBufferException;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.util.CollectionUtils;
@@ -167,4 +169,27 @@ public class ProtoConverter {
         });
         return kvList;
     }
+
+    public static byte[] convertToRpcRequest(TransportProtos.ToDeviceRpcRequestMsg toDeviceRpcRequestMsg) {
+        TransportProtos.ToDeviceRpcRequestMsg.Builder toDeviceRpcRequestMsgBuilder = toDeviceRpcRequestMsg.newBuilderForType();
+        toDeviceRpcRequestMsgBuilder.mergeFrom(toDeviceRpcRequestMsg);
+        toDeviceRpcRequestMsgBuilder.setParams(parseParams(toDeviceRpcRequestMsg));
+        TransportProtos.ToDeviceRpcRequestMsg result = toDeviceRpcRequestMsgBuilder.build();
+        return result.toByteArray();
+    }
+
+    private static String parseParams(TransportProtos.ToDeviceRpcRequestMsg toDeviceRpcRequestMsg) {
+        String params = toDeviceRpcRequestMsg.getParams();
+        JsonElement jsonElementParams = JSON_PARSER.parse(params);
+        if (!jsonElementParams.isJsonPrimitive()) {
+            return params;
+        } else {
+            JsonPrimitive primitiveParams = jsonElementParams.getAsJsonPrimitive();
+            if (jsonElementParams.getAsJsonPrimitive().isString()) {
+                return primitiveParams.getAsString();
+            } else {
+                return params;
+            }
+        }
+    }
 }