MQTT概述

MQTT是一种轻量级的发布-订阅消息传递协议，它可能最适合各种物联网设备。你可

ThingsBoard服务器节点充当支持QoS级别0（最多一次）和QoS级别1（至少一次）以及一组预定义主题的MQTT主题。

ThingsBoard基于MQTT协议提供给设备的API是非常”灵活”的。

关联模块

查找思路：application 启动项目，pom 文件中找到 mqtt-transport-common，再查找 mqtt-transport-common的引用模块


1. mqtt-transport-service
2. mqtt-transport-common
3. 微服务版本（忽略）
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MQTT Transport Service

  1. /**
  2. * Copyright © 2016-2022 The Thingsboard Authors
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. *     http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. package org.thingsboard.server.mqtt;
  18. import org.springframework.boot.SpringApplication;
  19. import org.springframework.boot.SpringBootConfiguration;
  20. import org.springframework.context.annotation.ComponentScan;
  21. import org.springframework.scheduling.annotation.EnableAsync;
  22. import org.springframework.scheduling.annotation.EnableScheduling;
  24. import java.util.Arrays;
  26. @SpringBootConfiguration
  27. @EnableAsync
  28. @EnableScheduling
  29. @ComponentScan({"org.thingsboard.server.mqtt", "org.thingsboard.server.common", "org.thingsboard.server.transport.mqtt", "org.thingsboard.server.queue", "org.thingsboard.server.cache"})
  30. public class ThingsboardMqttTransportApplication {
  32.     private static final String SPRING_CONFIG_NAME_KEY = "--spring.config.name";
  33.     private static final String DEFAULT_SPRING_CONFIG_PARAM = SPRING_CONFIG_NAME_KEY + "=" + "tb-mqtt-transport";
  35.     public static void main(String[] args) {
  36.         SpringApplication.run(ThingsboardMqttTransportApplication.class, updateArguments(args));
  37.     }
  39.     private static String[] updateArguments(String[] args) {
  40.         if (Arrays.stream(args).noneMatch(arg -> arg.startsWith(SPRING_CONFIG_NAME_KEY))) {
  41.             String[] modifiedArgs = new String[args.length + 1];
  42.             System.arraycopy(args, 0, modifiedArgs, 0, args.length);
  43.             modifiedArgs[args.length] = DEFAULT_SPRING_CONFIG_PARAM;
  44.             return modifiedArgs;
  45.         }
  46.         return args;
  47.     }
  48. }

MQTT Transport Common

  1. └── main
  2.     └── java
  3.         └── org.thingsboard.server.transport.mqtt
  4.                 └── adaptors
  5.                 │   ├── BackwardCompatibilityAdaptor.java    兼容json与Protobuf协议适配器
  6.                 │   ├── JsonMqttAdaptor.java Mqtt传输内容Json适配器
  7.                 │   ├── MqttTransportAdaptor.java Mqtt协议传输适配器
  8.                 │   └── ProtoMqttAdaptor.java Mqtt传输Protobuf适配器
  9.                 └── limits
  10.                 │    ├── IpFilter.java    IP过滤器
  11.                 │   └── ProxyIpFilter.java    代理IP过滤器
  12.                 └── session
  13.                 │   ├── DeviceSessionCtx.java 设备会话上下文
  14.                 │   ├── GatewayDeviceSessionCtx.java 网关设备会话上下文
  15.                 │   ├── GatewaySessionHandler.java 网关会话处理类
  16.                 │   ├── MqttDeviceAwareSessionContext.java Mqtt设备会话上下文
  17.                 │   └── MqttTopicMatcher.java Mqtt主题匹配器
  18.                 └── util
  19.                 │   ├── AlwaysTrueTopicFilter.java    always true 过滤器
  20.                 │   ├── EqualsTopicFilter.java    Mqtt euqals过滤器
  21.                 │   ├── MqttTopicFilter.java    Mqtt Topic过滤器
  22.                 │   ├── MqttTopicFilterFactory.java    Mqtt Topic过滤器工厂
  23.                 │   └── RegexTopicFilter.java    正则topic过滤器   
  24.                 ├── MqttSslHandlerProvider.java    Mqtt Ssl逻辑处理提供类
  25.                 ├── MqttTransportContext.java Mqtt传输协议上下文
  26.                 ├── MqttTransportHandler.java Mqttt传输协议逻辑处理类
  27.                 ├── MqttTransportServerInitializer.java Mqtt传输协议初始化类
  28.                 ├── MqttTransportService.java    Mqtt传输协议启动类
  29.                 └── TopicType.java Mqtt topic类型枚举