Improvements to Tenant rules and plugins startup sequence

@@ -136,6 +136,9 @@ public class ActorSystemContext {
     @Value("${actors.statistics.persist_frequency}")
     @Getter private long statisticsPersistFrequency;
 
+    @Value("${actors.tenant.create_components_on_init}")
+    @Getter private boolean tenantComponentsInitEnabled;
+
     @Getter @Setter private ActorSystem actorSystem;
 
     @Getter @Setter private ActorRef appActor;

@@ -174,7 +174,7 @@ public class AppActor extends ContextAwareActor {
         TenantId tenantId = toDeviceActorMsg.getTenantId();
         ActorRef tenantActor = getOrCreateTenantActor(tenantId);
         if (toDeviceActorMsg.getPayload().getMsgType().requiresRulesProcessing()) {
-            tenantActor.tell(new RuleChainDeviceMsg(toDeviceActorMsg, ruleManager.getRuleChain()), context().self());
+            tenantActor.tell(new RuleChainDeviceMsg(toDeviceActorMsg, ruleManager.getRuleChain(this.context())), context().self());
         } else {
             tenantActor.tell(toDeviceActorMsg, context().self());
         }

@@ -15,6 +15,7 @@
  */
 package org.thingsboard.server.actors.shared.plugin;
 
+import akka.actor.ActorContext;
 import org.thingsboard.server.actors.ActorSystemContext;
 import org.thingsboard.server.actors.service.DefaultActorService;
 import org.thingsboard.server.common.data.id.TenantId;
@@ -30,6 +31,12 @@ public class TenantPluginManager extends PluginManager {
         this.tenantId = tenantId;
     }
 
+    public void init(ActorContext context) {
+        if (systemContext.isTenantComponentsInitEnabled()) {
+            super.init(context);
+        }
+    }
+
     @Override
     FetchFunction<PluginMetaData> getFetchPluginsFunction() {
         return link -> pluginService.findTenantPlugins(tenantId, link);

@@ -25,7 +25,6 @@ import org.thingsboard.server.actors.rule.RuleActorChain;
 import org.thingsboard.server.actors.rule.RuleActorMetaData;
 import org.thingsboard.server.actors.rule.SimpleRuleActorChain;
 import org.thingsboard.server.actors.service.ContextAwareActor;
-import org.thingsboard.server.actors.service.DefaultActorService;
 import org.thingsboard.server.common.data.id.RuleId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.page.PageDataIterable;
@@ -72,6 +71,9 @@ public abstract class RuleManager {
     }
 
     public Optional<ActorRef> update(ActorContext context, RuleId ruleId, ComponentLifecycleEvent event) {
+        if (ruleMap == null) {
+            init(context);
+        }
         RuleMetaData rule;
         if (event != ComponentLifecycleEvent.DELETED) {
             rule = systemContext.getRuleService().findRuleById(ruleId);
@@ -111,11 +113,13 @@ public abstract class RuleManager {
                         .withDispatcher(getDispatcherName()), rId.toString()));
     }
 
-    public RuleActorChain getRuleChain() {
+    public RuleActorChain getRuleChain(ActorContext context) {
+        if (ruleMap == null) {
+            init(context);
+        }
         return ruleChain;
     }
 
-
     private void refreshRuleChain() {
         Set<RuleActorMetaData> activeRuleSet = new HashSet<>();
         for (Map.Entry<RuleMetaData, RuleActorMetaData> rule : ruleMap.entrySet()) {

@@ -15,6 +15,7 @@
  */
 package org.thingsboard.server.actors.shared.rule;
 
+import akka.actor.ActorContext;
 import org.thingsboard.server.actors.ActorSystemContext;
 import org.thingsboard.server.actors.service.DefaultActorService;
 import org.thingsboard.server.common.data.id.TenantId;
@@ -27,6 +28,12 @@ public class TenantRuleManager extends RuleManager {
         super(systemContext, tenantId);
     }
 
+    public void init(ActorContext context) {
+        if (systemContext.isTenantComponentsInitEnabled()) {
+            super.init(context);
+        }
+    }
+
     @Override
     FetchFunction<RuleMetaData> getFetchRulesFunction() {
         return link -> ruleService.findTenantRules(tenantId, link);

@@ -151,18 +151,13 @@ public class TenantActor extends ContextAwareActor {
     private void process(RuleChainDeviceMsg msg) {
         ToDeviceActorMsg toDeviceActorMsg = msg.getToDeviceActorMsg();
         ActorRef deviceActor = getOrCreateDeviceActor(toDeviceActorMsg.getDeviceId());
-        RuleActorChain chain = new ComplexRuleActorChain(msg.getRuleChain(), ruleManager.getRuleChain());
+        RuleActorChain chain = new ComplexRuleActorChain(msg.getRuleChain(), ruleManager.getRuleChain(this.context()));
         deviceActor.tell(new RuleChainDeviceMsg(toDeviceActorMsg, chain), context().self());
     }
 
     private ActorRef getOrCreateDeviceActor(DeviceId deviceId) {
-        ActorRef deviceActor = deviceActors.get(deviceId);
-        if (deviceActor == null) {
-            deviceActor = context().actorOf(Props.create(new DeviceActor.ActorCreator(systemContext, tenantId, deviceId))
-                    .withDispatcher(DefaultActorService.CORE_DISPATCHER_NAME), deviceId.toString());
-            deviceActors.put(deviceId, deviceActor);
-        }
-        return deviceActor;
+        return deviceActors.computeIfAbsent(deviceId, k -> context().actorOf(Props.create(new DeviceActor.ActorCreator(systemContext, tenantId, deviceId))
+                .withDispatcher(DefaultActorService.CORE_DISPATCHER_NAME), deviceId.toString()));
     }
 
     public static class ActorCreator extends ContextBasedCreator<TenantActor> {

@@ -15,30 +15,16 @@
  */
 package org.thingsboard.server.controller;
 
-import com.google.common.util.concurrent.ListenableFuture;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.web.bind.annotation.*;
-import org.thingsboard.server.common.data.Customer;
-import org.thingsboard.server.common.data.Event;
 import org.thingsboard.server.common.data.alarm.*;
-import org.thingsboard.server.common.data.asset.Asset;
 import org.thingsboard.server.common.data.id.*;
-import org.thingsboard.server.common.data.page.TextPageData;
-import org.thingsboard.server.common.data.page.TextPageLink;
 import org.thingsboard.server.common.data.page.TimePageData;
 import org.thingsboard.server.common.data.page.TimePageLink;
-import org.thingsboard.server.dao.asset.AssetSearchQuery;
-import org.thingsboard.server.dao.exception.IncorrectParameterException;
-import org.thingsboard.server.dao.model.ModelConstants;
 import org.thingsboard.server.exception.ThingsboardErrorCode;
 import org.thingsboard.server.exception.ThingsboardException;
-import org.thingsboard.server.service.security.model.SecurityUser;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.stream.Collectors;
 
 @RestController
 @RequestMapping("/api")

@@ -27,7 +27,7 @@ import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.page.TextPageData;
 import org.thingsboard.server.common.data.page.TextPageLink;
-import org.thingsboard.server.dao.asset.AssetSearchQuery;
+import org.thingsboard.server.common.data.asset.AssetSearchQuery;
 import org.thingsboard.server.dao.exception.IncorrectParameterException;
 import org.thingsboard.server.dao.model.ModelConstants;
 import org.thingsboard.server.exception.ThingsboardException;

@@ -28,7 +28,7 @@ import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.page.TextPageData;
 import org.thingsboard.server.common.data.page.TextPageLink;
 import org.thingsboard.server.common.data.security.DeviceCredentials;
-import org.thingsboard.server.dao.device.DeviceSearchQuery;
+import org.thingsboard.server.common.data.device.DeviceSearchQuery;
 import org.thingsboard.server.dao.exception.IncorrectParameterException;
 import org.thingsboard.server.dao.model.ModelConstants;
 import org.thingsboard.server.exception.ThingsboardException;

@@ -159,6 +159,8 @@ cassandra:
 
 # Actor system parameters
 actors:
+  tenant:
+    create_components_on_init: true
   session:
     sync:
       # Default timeout for processing request using synchronous session (HTTP, CoAP) in milliseconds

@@ -97,28 +97,28 @@ public abstract class AbstractControllerTest {
 
     protected static final String SYS_ADMIN_EMAIL = "sysadmin@thingsboard.org";
     private static final String SYS_ADMIN_PASSWORD = "sysadmin";
-    
+
     protected static final String TENANT_ADMIN_EMAIL = "testtenant@thingsboard.org";
     private static final String TENANT_ADMIN_PASSWORD = "tenant";
 
     protected static final String CUSTOMER_USER_EMAIL = "testcustomer@thingsboard.org";
     private static final String CUSTOMER_USER_PASSWORD = "customer";
-    
+
     protected MediaType contentType = new MediaType(MediaType.APPLICATION_JSON.getType(),
             MediaType.APPLICATION_JSON.getSubtype(),
             Charset.forName("utf8"));
 
     protected MockMvc mockMvc;
-    
+
     protected String token;
     protected String refreshToken;
     protected String username;
 
     private TenantId tenantId;
-    
+
     @SuppressWarnings("rawtypes")
     private HttpMessageConverter mappingJackson2HttpMessageConverter;
-    
+
     @Autowired
     private WebApplicationContext webApplicationContext;
 
@@ -132,7 +132,7 @@ public abstract class AbstractControllerTest {
             log.info("Finished test: {}", description.getMethodName());
         }
     };
-    
+
     @Autowired
     void setConverters(HttpMessageConverter<?>[] converters) {
 
@@ -144,7 +144,7 @@ public abstract class AbstractControllerTest {
         Assert.assertNotNull("the JSON message converter must not be null",
                 this.mappingJackson2HttpMessageConverter);
     }
-    
+
     @Before
     public void setup() throws Exception {
         log.info("Executing setup");
@@ -188,7 +188,7 @@ public abstract class AbstractControllerTest {
     public void teardown() throws Exception {
         log.info("Executing teardown");
         loginSysAdmin();
-        doDelete("/api/tenant/"+tenantId.getId().toString())
+        doDelete("/api/tenant/" + tenantId.getId().toString())
                 .andExpect(status().isOk());
         log.info("Executed teardown");
     }
@@ -196,7 +196,7 @@ public abstract class AbstractControllerTest {
     protected void loginSysAdmin() throws Exception {
         login(SYS_ADMIN_EMAIL, SYS_ADMIN_PASSWORD);
     }
-    
+
     protected void loginTenantAdmin() throws Exception {
         login(TENANT_ADMIN_EMAIL, TENANT_ADMIN_PASSWORD);
     }
@@ -204,13 +204,13 @@ public abstract class AbstractControllerTest {
     protected void loginCustomerUser() throws Exception {
         login(CUSTOMER_USER_EMAIL, CUSTOMER_USER_PASSWORD);
     }
-    
+
     protected User createUserAndLogin(User user, String password) throws Exception {
         User savedUser = doPost("/api/user", user, User.class);
         logout();
         doGet("/api/noauth/activate?activateToken={activateToken}", TestMailService.currentActivateToken)
-        .andExpect(status().isSeeOther())
-        .andExpect(header().string(HttpHeaders.LOCATION, "/login/createPassword?activateToken=" + TestMailService.currentActivateToken));
+                .andExpect(status().isSeeOther())
+                .andExpect(header().string(HttpHeaders.LOCATION, "/login/createPassword?activateToken=" + TestMailService.currentActivateToken));
         JsonNode tokenInfo = readResponse(doPost("/api/noauth/activate", "activateToken", TestMailService.currentActivateToken, "password", password).andExpect(status().isOk()), JsonNode.class);
         validateAndSetJwtToken(tokenInfo, user.getEmail());
         return savedUser;
@@ -247,14 +247,14 @@ public abstract class AbstractControllerTest {
         Assert.assertNotNull(token);
         Assert.assertFalse(token.isEmpty());
         int i = token.lastIndexOf('.');
-        Assert.assertTrue(i>0);
-        String withoutSignature = token.substring(0, i+1);
-        Jwt<Header,Claims> jwsClaims = Jwts.parser().parseClaimsJwt(withoutSignature);
+        Assert.assertTrue(i > 0);
+        String withoutSignature = token.substring(0, i + 1);
+        Jwt<Header, Claims> jwsClaims = Jwts.parser().parseClaimsJwt(withoutSignature);
         Claims claims = jwsClaims.getBody();
         String subject = claims.getSubject();
         Assert.assertEquals(username, subject);
     }
-    
+
     protected void logout() throws Exception {
         this.token = null;
         this.refreshToken = null;
@@ -266,24 +266,24 @@ public abstract class AbstractControllerTest {
             request.header(ThingsboardSecurityConfiguration.JWT_TOKEN_HEADER_PARAM, "Bearer " + this.token);
         }
     }
-     
+
     protected ResultActions doGet(String urlTemplate, Object... urlVariables) throws Exception {
         MockHttpServletRequestBuilder getRequest = get(urlTemplate, urlVariables);
         setJwtToken(getRequest);
         return mockMvc.perform(getRequest);
     }
-    
+
     protected <T> T doGet(String urlTemplate, Class<T> responseClass, Object... urlVariables) throws Exception {
         return readResponse(doGet(urlTemplate, urlVariables).andExpect(status().isOk()), responseClass);
     }
-    
+
     protected <T> T doGetTyped(String urlTemplate, TypeReference<T> responseType, Object... urlVariables) throws Exception {
         return readResponse(doGet(urlTemplate, urlVariables).andExpect(status().isOk()), responseType);
     }
-    
+
     protected <T> T doGetTypedWithPageLink(String urlTemplate, TypeReference<T> responseType,
-            TextPageLink pageLink,
-            Object... urlVariables) throws Exception {
+                                           TextPageLink pageLink,
+                                           Object... urlVariables) throws Exception {
         List<Object> pageLinkVariables = new ArrayList<>();
         urlTemplate += "limit={limit}";
         pageLinkVariables.add(pageLink.getLimit());
@@ -299,18 +299,18 @@ public abstract class AbstractControllerTest {
             urlTemplate += "&textOffset={textOffset}";
             pageLinkVariables.add(pageLink.getTextOffset());
         }
-        
-        Object[] vars = new Object[urlVariables.length + pageLinkVariables.size()];        
+
+        Object[] vars = new Object[urlVariables.length + pageLinkVariables.size()];
         System.arraycopy(urlVariables, 0, vars, 0, urlVariables.length);
         System.arraycopy(pageLinkVariables.toArray(), 0, vars, urlVariables.length, pageLinkVariables.size());
-        
+
         return readResponse(doGet(urlTemplate, vars).andExpect(status().isOk()), responseType);
     }
-    
+
     protected <T> T doPost(String urlTemplate, Class<T> responseClass, String... params) throws Exception {
         return readResponse(doPost(urlTemplate, params).andExpect(status().isOk()), responseClass);
     }
-    
+
     protected <T> T doPost(String urlTemplate, T content, Class<T> responseClass, String... params) throws Exception {
         return readResponse(doPost(urlTemplate, content, params).andExpect(status().isOk()), responseClass);
     }
@@ -318,15 +318,15 @@ public abstract class AbstractControllerTest {
     protected <T> T doDelete(String urlTemplate, Class<T> responseClass, String... params) throws Exception {
         return readResponse(doDelete(urlTemplate, params).andExpect(status().isOk()), responseClass);
     }
-     
+
     protected ResultActions doPost(String urlTemplate, String... params) throws Exception {
         MockHttpServletRequestBuilder postRequest = post(urlTemplate);
         setJwtToken(postRequest);
         populateParams(postRequest, params);
         return mockMvc.perform(postRequest);
     }
-    
-    protected <T> ResultActions doPost(String urlTemplate, T content, String... params)  throws Exception {
+
+    protected <T> ResultActions doPost(String urlTemplate, T content, String... params) throws Exception {
         MockHttpServletRequestBuilder postRequest = post(urlTemplate);
         setJwtToken(postRequest);
         String json = json(content);
@@ -334,25 +334,25 @@ public abstract class AbstractControllerTest {
         populateParams(postRequest, params);
         return mockMvc.perform(postRequest);
     }
-    
+
     protected ResultActions doDelete(String urlTemplate, String... params) throws Exception {
         MockHttpServletRequestBuilder deleteRequest = delete(urlTemplate);
         setJwtToken(deleteRequest);
         populateParams(deleteRequest, params);
         return mockMvc.perform(deleteRequest);
     }
-    
+
     protected void populateParams(MockHttpServletRequestBuilder request, String... params) {
         if (params != null && params.length > 0) {
             Assert.assertEquals(params.length % 2, 0);
             MultiValueMap<String, String> paramsMap = new LinkedMultiValueMap<String, String>();
-            for (int i=0;i<params.length;i+=2) {
-                paramsMap.add(params[i], params[i+1]);
+            for (int i = 0; i < params.length; i += 2) {
+                paramsMap.add(params[i], params[i + 1]);
             }
             request.params(paramsMap);
         }
     }
-    
+
     @SuppressWarnings("unchecked")
     protected String json(Object o) throws IOException {
         MockHttpOutputMessage mockHttpOutputMessage = new MockHttpOutputMessage();
@@ -360,14 +360,14 @@ public abstract class AbstractControllerTest {
                 o, MediaType.APPLICATION_JSON, mockHttpOutputMessage);
         return mockHttpOutputMessage.getBodyAsString();
     }
-    
+
     @SuppressWarnings("unchecked")
     protected <T> T readResponse(ResultActions result, Class<T> responseClass) throws Exception {
         byte[] content = result.andReturn().getResponse().getContentAsByteArray();
         MockHttpInputMessage mockHttpInputMessage = new MockHttpInputMessage(content);
         return (T) this.mappingJackson2HttpMessageConverter.read(responseClass, mockHttpInputMessage);
     }
-    
+
     protected <T> T readResponse(ResultActions result, TypeReference<T> type) throws Exception {
         byte[] content = result.andReturn().getResponse().getContentAsByteArray();
         ObjectMapper mapper = new ObjectMapper();

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.dao.asset;
+package org.thingsboard.server.common.data.asset;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.EntityType;
@@ -22,7 +22,6 @@ import org.thingsboard.server.common.data.relation.EntityRelationsQuery;
 import org.thingsboard.server.common.data.relation.EntityTypeFilter;
 import org.thingsboard.server.common.data.relation.RelationsSearchParameters;
 
-import javax.annotation.Nullable;
 import java.util.Collections;
 import java.util.List;
 
@@ -33,9 +32,7 @@ import java.util.List;
 public class AssetSearchQuery {
 
     private RelationsSearchParameters parameters;
-    @Nullable
     private String relationType;
-    @Nullable
     private List<String> assetTypes;
 
     public EntityRelationsQuery toEntitySearchQuery() {

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.thingsboard.server.dao.device;
+package org.thingsboard.server.common.data.device;
 
 import lombok.Data;
 import org.thingsboard.server.common.data.EntityType;

@@ -18,6 +18,7 @@ package org.thingsboard.server.dao.asset;
 import com.google.common.util.concurrent.ListenableFuture;
 import org.thingsboard.server.common.data.EntitySubtype;
 import org.thingsboard.server.common.data.asset.Asset;
+import org.thingsboard.server.common.data.asset.AssetSearchQuery;
 import org.thingsboard.server.common.data.id.AssetId;
 import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.TenantId;

@@ -29,6 +29,7 @@ import org.thingsboard.server.common.data.EntitySubtype;
 import org.thingsboard.server.common.data.EntityType;
 import org.thingsboard.server.common.data.Tenant;
 import org.thingsboard.server.common.data.asset.Asset;
+import org.thingsboard.server.common.data.asset.AssetSearchQuery;
 import org.thingsboard.server.common.data.id.AssetId;
 import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.EntityId;

@@ -18,6 +18,7 @@ package org.thingsboard.server.dao.device;
 import com.google.common.util.concurrent.ListenableFuture;
 import org.thingsboard.server.common.data.Device;
 import org.thingsboard.server.common.data.EntitySubtype;
+import org.thingsboard.server.common.data.device.DeviceSearchQuery;
 import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.TenantId;

@@ -25,6 +25,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
 import org.thingsboard.server.common.data.*;
+import org.thingsboard.server.common.data.device.DeviceSearchQuery;
 import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.EntityId;

@@ -16,6 +16,7 @@
 package org.thingsboard.server.transport.mqtt;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.handler.codec.mqtt.*;
@@ -45,6 +46,8 @@ import org.thingsboard.server.transport.mqtt.util.SslUtil;
 
 import javax.net.ssl.SSLPeerUnverifiedException;
 import javax.security.cert.X509Certificate;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -71,6 +74,7 @@ public class MqttTransportHandler extends ChannelInboundHandlerAdapter implement
     private final RelationService relationService;
     private final SslHandler sslHandler;
     private volatile boolean connected;
+    private volatile InetSocketAddress address;
     private volatile GatewaySessionCtx gatewaySessionCtx;
 
     public MqttTransportHandler(SessionMsgProcessor processor, DeviceService deviceService, DeviceAuthService authService, RelationService relationService,
@@ -94,30 +98,36 @@ public class MqttTransportHandler extends ChannelInboundHandlerAdapter implement
     }
 
     private void processMqttMsg(ChannelHandlerContext ctx, MqttMessage msg) {
-        deviceSessionCtx.setChannel(ctx);
-        switch (msg.fixedHeader().messageType()) {
-            case CONNECT:
-                processConnect(ctx, (MqttConnectMessage) msg);
-                break;
-            case PUBLISH:
-                processPublish(ctx, (MqttPublishMessage) msg);
-                break;
-            case SUBSCRIBE:
-                processSubscribe(ctx, (MqttSubscribeMessage) msg);
-                break;
-            case UNSUBSCRIBE:
-                processUnsubscribe(ctx, (MqttUnsubscribeMessage) msg);
-                break;
-            case PINGREQ:
-                if (checkConnected(ctx)) {
-                    ctx.writeAndFlush(new MqttMessage(new MqttFixedHeader(PINGRESP, false, AT_MOST_ONCE, false, 0)));
-                }
-                break;
-            case DISCONNECT:
-                if (checkConnected(ctx)) {
-                    processDisconnect(ctx);
-                }
-                break;
+        address = (InetSocketAddress) ctx.channel().remoteAddress();
+        if (msg.fixedHeader() == null) {
+            log.info("[{}:{}] Invalid message received", address.getHostName(), address.getPort());
+            processDisconnect(ctx);
+        } else {
+            deviceSessionCtx.setChannel(ctx);
+            switch (msg.fixedHeader().messageType()) {
+                case CONNECT:
+                    processConnect(ctx, (MqttConnectMessage) msg);
+                    break;
+                case PUBLISH:
+                    processPublish(ctx, (MqttPublishMessage) msg);
+                    break;
+                case SUBSCRIBE:
+                    processSubscribe(ctx, (MqttSubscribeMessage) msg);
+                    break;
+                case UNSUBSCRIBE:
+                    processUnsubscribe(ctx, (MqttUnsubscribeMessage) msg);
+                    break;
+                case PINGREQ:
+                    if (checkConnected(ctx)) {
+                        ctx.writeAndFlush(new MqttMessage(new MqttFixedHeader(PINGRESP, false, AT_MOST_ONCE, false, 0)));
+                    }
+                    break;
+                case DISCONNECT:
+                    if (checkConnected(ctx)) {
+                        processDisconnect(ctx);
+                    }
+                    break;
+            }
         }
     }
 
@@ -313,9 +323,11 @@ public class MqttTransportHandler extends ChannelInboundHandlerAdapter implement
 
     private void processDisconnect(ChannelHandlerContext ctx) {
         ctx.close();
-        processor.process(SessionCloseMsg.onDisconnect(deviceSessionCtx.getSessionId()));
-        if (gatewaySessionCtx != null) {
-            gatewaySessionCtx.onGatewayDisconnect();
+        if (connected) {
+            processor.process(SessionCloseMsg.onDisconnect(deviceSessionCtx.getSessionId()));
+            if (gatewaySessionCtx != null) {
+                gatewaySessionCtx.onGatewayDisconnect();
+            }
         }
     }