refactor(mqtt): 优化MQTT消息处理机制并修复空指针异常

- 修复EventServiceImpl中SagSource为空时的空指针异常
- 在HeartbeatServiceImpl中统一心跳超时级别命名规范
- 将Redis操作合并为原子方法减少网络调用次数
- 新增MQTT消息异步处理线程池避免Paho回调阻塞
- 将MQTT消息处理逻辑重构为异步提交模式提升性能
- 为Cloud事件添加数据报文日志便于调试追踪
- 优化心跳消息处理确保关键操作同步执行

iot-access/access-boot/src/main/java/com/njcn/access/config/MqttAccessSchedulerConfig.java

@@ -49,4 +49,21 @@ public class MqttAccessSchedulerConfig {
         log.info("初始化MQTT接入信号量, 并发上限={}", concurrencyLimit);
         return new Semaphore(concurrencyLimit);
     }
+
+
+    /**
+     * MQTT消息异步处理线程池
+     * 用于将 @MqttSubscribe 回调中的重活(Feign调用、Kafka发送)异步化
+     * 避免阻塞Paho单线程回调，导致心跳消息排队延迟
+     */
+    @Bean(destroyMethod = "shutdownNow")
+    public ExecutorService mqttMessageExecutor() {
+        return new ThreadPoolExecutor(
+                10, 20,
+                60L, TimeUnit.SECONDS,
+                new LinkedBlockingQueue<>(500),
+                r -> new Thread(r, "mqtt-msg-handler"),
+                new ThreadPoolExecutor.CallerRunsPolicy()
+        );
+    }
 }

iot-access/access-boot/src/main/java/com/njcn/access/config/MqttOptionsFixer.java

@@ -0,0 +1,21 @@
+package com.njcn.access.config;
+
+import lombok.extern.slf4j.Slf4j;
+import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.stereotype.Component;
+
+@Component
+@Slf4j
+public class MqttOptionsFixer implements BeanPostProcessor {
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        if (bean instanceof MqttConnectOptions) {
+            MqttConnectOptions options = (MqttConnectOptions) bean;
+            options.setMaxInflight(200);
+        }
+        return bean;
+    }
+}

iot-access/access-boot/src/main/java/com/njcn/access/runner/UpdateDevStatusTimer.java

@@ -18,7 +18,7 @@ public class UpdateDevStatusTimer {
 
     private final ICsHeartService csHeartService;
 
-    @Scheduled(cron = "0 0/30 * * * ?")
+    @Scheduled(cron = "0 0/10 * * * ?")
     public void timer() {
         csHeartService.updateDevStatus();
     }

iot-access/access-boot/src/main/java/com/njcn/access/service/impl/HeartbeatServiceImpl.java

@@ -21,7 +21,7 @@ public class HeartbeatServiceImpl implements IHeartbeatService {
     @Resource
     private RedisUtil redisUtil;
     private static final String HEARTBEAT_REDIS_KEY_PREFIX = "HEARTBEAT:";
-    private static final int DELAY_LEVEL_4MIN = 7;
+    private static final int DELAY_LEVEL_3MIN = 7;
     private static final long HEARTBEAT_EXPIRE_SECONDS = 180;
 
     @Override
@@ -29,14 +29,12 @@ public class HeartbeatServiceImpl implements IHeartbeatService {
         String redisKey = HEARTBEAT_REDIS_KEY_PREFIX + nDid;
         long currentTime = System.currentTimeMillis();
 
-        redisUtil.saveByKey(redisKey, currentTime);
-        redisUtil.expire(redisKey, HEARTBEAT_EXPIRE_SECONDS);
+        redisUtil.saveByKeyWithExpire(redisKey, currentTime, HEARTBEAT_EXPIRE_SECONDS);
 
         HeartbeatTimeoutMessage message = new HeartbeatTimeoutMessage();
-
         message.setNDid(nDid);
         message.setTimestamp(currentTime);
-        message.setDelayLevel(DELAY_LEVEL_4MIN);
+        message.setDelayLevel(DELAY_LEVEL_3MIN);
         heartbeatTimeoutMessageTemplate.sendMember(message);
     }