Fixed device disconnect behaviour for gateway

@@ -25,10 +25,7 @@ import io.netty.handler.codec.mqtt.*;
 import org.thingsboard.server.common.data.Device;
 import org.thingsboard.server.common.data.id.SessionId;
 import org.thingsboard.server.common.data.kv.KvEntry;
-import org.thingsboard.server.common.msg.core.AttributesUpdateNotification;
-import org.thingsboard.server.common.msg.core.GetAttributesResponse;
-import org.thingsboard.server.common.msg.core.ResponseMsg;
-import org.thingsboard.server.common.msg.core.ToDeviceRpcRequestMsg;
+import org.thingsboard.server.common.msg.core.*;
 import org.thingsboard.server.common.msg.kv.AttributesKVMsg;
 import org.thingsboard.server.common.msg.session.*;
 import org.thingsboard.server.common.msg.session.ex.SessionException;

@@ -90,6 +90,7 @@ public class GatewaySessionCtx {
         String deviceName = checkDeviceName(getDeviceName(msg));
         GatewayDeviceSessionCtx deviceSessionCtx = devices.remove(deviceName);
         if (deviceSessionCtx != null) {
+            processor.process(SessionCloseMsg.onDisconnect(deviceSessionCtx.getSessionId()));
             deviceSessionCtx.setClosed(true);
         }
         ack(msg);