diff --git a/tools/pom.xml b/tools/pom.xml
index 3e76f4675f..96235e2cbe 100644
--- a/tools/pom.xml
+++ b/tools/pom.xml
@@ -54,40 +54,4 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                        <configuration>
-                            <filters>
-                                <filter>
-                                    <artifact>*:*</artifact>
-                                    <excludes>
-                                        <exclude>META-INF/*.SF</exclude>
-                                        <exclude>META-INF/*.DSA</exclude>
-                                        <exclude>META-INF/*.RSA</exclude>
-                                    </excludes>
-                                </filter>
-                            </filters>
-                            <transformers>
-                                <transformer
-                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                                    <manifestEntries>
-                                        <Main-Class>org.thingsboard.client.tools.MqttStressTestTool</Main-Class>
-                                    </manifestEntries>
-                                </transformer>
-                            </transformers>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
 </project>
diff --git a/tools/src/main/java/org/thingsboard/client/tools/RestClient.java b/tools/src/main/java/org/thingsboard/client/tools/RestClient.java
index f742e6131e..d635dbcb3e 100644
--- a/tools/src/main/java/org/thingsboard/client/tools/RestClient.java
+++ b/tools/src/main/java/org/thingsboard/client/tools/RestClient.java
@@ -27,6 +27,7 @@ import org.springframework.http.client.support.HttpRequestWrapper;
 import org.springframework.web.client.HttpClientErrorException;
 import org.springframework.web.client.RestTemplate;
 import org.thingsboard.server.common.data.Device;
+import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.security.DeviceCredentials;
 
@@ -76,6 +77,12 @@ public class RestClient implements ClientHttpRequestInterceptor {
         return restTemplate.postForEntity(baseURL + "/api/device", device, Device.class).getBody();
     }
 
+
+    public Device assignDevice(CustomerId customerId, DeviceId deviceId) {
+        return restTemplate.postForEntity(baseURL + "/api/customer/{customerId}/device/{deviceId}", null, Device.class,
+                customerId.toString(), deviceId.toString()).getBody();
+    }
+
     public DeviceCredentials getCredentials(DeviceId id) {
         return restTemplate.getForEntity(baseURL + "/api/device/" + id.getId().toString() + "/credentials", DeviceCredentials.class).getBody();
     }
diff --git a/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/MqttTransportServerInitializer.java b/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/MqttTransportServerInitializer.java
index 9444cdd1c0..af109f652b 100644
--- a/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/MqttTransportServerInitializer.java
+++ b/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/MqttTransportServerInitializer.java
@@ -40,6 +40,8 @@ import java.security.cert.CertificateException;
  */
 public class MqttTransportServerInitializer extends ChannelInitializer<SocketChannel> {
 
+    private static final int MAX_PAYLOAD_SIZE = 64 * 1024 * 1024;
+
     private final SessionMsgProcessor processor;
     private final DeviceService deviceService;
     private final DeviceAuthService authService;
@@ -63,7 +65,7 @@ public class MqttTransportServerInitializer extends ChannelInitializer<SocketCha
             sslHandler = sslHandlerProvider.getSslHandler();
             pipeline.addLast(sslHandler);
         }
-        pipeline.addLast("decoder", new MqttDecoder());
+        pipeline.addLast("decoder", new MqttDecoder(MAX_PAYLOAD_SIZE));
         pipeline.addLast("encoder", MqttEncoder.INSTANCE);
 
         MqttTransportHandler handler = new MqttTransportHandler(processor, deviceService, authService, adaptor, sslHandler);
diff --git a/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/session/GatewaySessionCtx.java b/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/session/GatewaySessionCtx.java
index c7deeec5a5..b8de7c57e1 100644
--- a/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/session/GatewaySessionCtx.java
+++ b/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/session/GatewaySessionCtx.java
@@ -134,7 +134,7 @@ public class GatewaySessionCtx {
             JsonObject jsonObj = json.getAsJsonObject();
             String deviceName = checkDeviceConnected(jsonObj.get("device").getAsString());
             Integer requestId = jsonObj.get("id").getAsInt();
-            String data = jsonObj.get("data").getAsString();
+            String data = jsonObj.get("data").toString();
             GatewayDeviceSessionCtx deviceSessionCtx = devices.get(deviceName);
             processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(),
                     new BasicAdaptorToSessionActorMsg(deviceSessionCtx, new ToDeviceRpcResponseMsg(requestId, data))));